Break through in lost circulation with inventing the most effective solution of engineered fiber network and discovering its mechanisim for the very first time in oil industry. The product is applicable to mud and cement. "I believe in being an innovator (Walt Disney)"

1. MicroPatent Report
Report Summary:
Name of Session/Report:
Report Created: 2010-12-03 - 05:23 GMT
Number of records selected: 10
Table of Contents
1. US20100298175A1 C09K
LOST CIRCULATION MATERIAL FOR OILFIELD USE
2. US20100152070A1 C09K
DRILLING LOST CIRCULATION MATERIAL
3. EP2196516A1 C09K SCHLUMBERGER SERVICES PETROL
LOST CIRCULATION MATERIAL FOR DRILLING FLUIDS
4. EP2085449A1 C04B SCHLUMBERGER SERVICES PETROL
CEMENT COMPOSITION COMPRISING MIXTURE OF ORGANIC AND INORGANIC FIBRES
FOR CURING SEVERE LOSSES ESPECIALLY IN THE RESERVOIR SECTION
5. EP2083059A1 C04B SCHLUMBERGER SERVICES PETROL
CEMENT COMPOSITIONS CONTAINING INORGANIC AND ORGANIC FIBRES
6. WO2010133302A1 C09K SCHLUMBERGER SERVICES PETROL
LOST CIRCULATION MATERIAL FOR OILFIELD USE
7. WO2009083238A1 C04B SCHLUMBERGER SERVICES PETROL
CEMENT COMPOSITION COMPRISING MIXTURE OF ORGANIC AND INORGANIC FIBRES
FOR CURING SEVERE LOSSES ESPECIALLY IN THE RESERVOIR SECTION
8. WO2009083238A4 C04B SCHLUMBERGER SERVICES PETROL
CEMENT COMPOSITION COMPRISING MIXTURE OF ORGANIC AND INORGANIC FIBRES
FOR CURING SEVERE LOSSES ESPECIALLY IN THE RESERVOIR SECTION
9. WO2009083236A4 C04B SCHLUMBERGER SERVICES PETROL
CEMENT COMPOSITIONS CONTAINING INORGANIC AND ORGANIC FIBRES
10. WO2009083236A1 C04B SCHLUMBERGER SERVICES PETROL
CEMENT COMPOSITIONS CONTAINING INORGANIC AND ORGANIC FIBRES
i © 2010 MicroPatent, LLC

2. US20100298175A1 MicroPatent Report
LOST CIRCULATION MATERIAL FOR OILFIELD USE
[71] Applicant: N/A
[75] Inventors: Ghassemzadeh, Jaleh
[21] Application No.: US2009468232A
[22] Filed: 20090519
[43] Published: 20101125
[30] Priority: US US2009468232A 20090519
Go to Fulltext Get PDF
[57] Abstract:
A composition for reducing lost circulation in a well, while drilling the well with
a drilling mud, which is composed of a base fluid, a mixture of particles, and a
blend of fibers. The composition is used by stopping drilling with the mud,
injecting a spacer, injecting the water-based composition, injecting a spacer, and
resuming drilling with the oil-based mud.
[52] US Class: 507124 507100
[51] Int’l Class: C09K000802 C09K0008035
[52] ECLA: C09K0008516 C09K0008504B C09K0008508
1 © 2010 MicroPatent, LLC

3. US20100298175A1
[57] Claims:
Having thus described my invention, I claim:
1. A water-based composition for reducing lost circulation while drilling a
well with an oil-based drilling mud, the composition comprising:
an aqueous base fluid,
a mixture of coarse, medium and fine particles, and
a blend of long fibers and short fibers,
wherein at least a portion of the medium particles or coarse particles or
both swells in the presence of the oil-based drilling mud.
2. The composition of claim 1 wherein the fine particles have an average
particle size of from about 5 to about 15 microns, the medium particles have
an average particle size of from about 20 to about 150 microns, and the coarse
particles have an average particle size of from about 300 to about 2500
microns.
3. The composition of claim 1 wherein the mixture of particles comprises from
about 0 to about 15 weight percent fine particles, about 20 to about 40 weight
percent medium particles, and about 40 to about 60 weight percent coarse
particles.
4. The composition of claim 1 wherein at least about 60 weight percent of the
mixture of particles is acid-soluble.
5. The composition of claim 1 wherein the long fibers are rigid and the short
fibers are flexible.
6. The composition of claim 1 wherein the weight ratio of long fibers to short
fibers is from about 1:4 to about 4:1.
7. The composition of claim 1 wherein at least a portion of the fibers is acid-
soluble.
8. The composition of claim 1 wherein the long fibers comprise water-insoluble
polyvinyl alcohol and the short fibers comprise water-soluble polyvinyl
alcohol.
9. The composition of claim 1 wherein the short fibers comprise a mixture of
fibers of two different lengths.
10. The composition of claim 1 wherein both the long fibers and the short
fibers comprise polyvinyl alcohol fibers.
11. The composition of claim 1 wherein the long fiber is polyvinyl alcohol and
the short fiber is an inorganic fiber.
12. The composition of claim 1 wherein the aqueous base fluid is a drilling
mud.
13. The composition of claim 1 wherein at least one of the long fibers and the
short fibers comprises a metal.
14. A water-based composition for reducing lost circulation while drilling a
well with an oil-based drilling mud, the composition comprising:
2 © 2010 MicroPatent, LLC

4. US20100298175A1
an aqueous base fluid,
a mixture of coarse, medium and fine particles, and
a blend of two different rigid fibers,
wherein the different rigid fibers comprise fibers of different lengths or
different diameters or different compositions, and
wherein at least a portion of the medium particles or coarse particles or
both swells in the presence of the oil-based drilling mud.
15. A method of reducing lost circulation in a well, while drilling with an
oil-based drilling mud, comprising:
injecting a first spacer, then
injecting a water-based composition comprising
an aqueous base fluid,
a mixture of coarse, medium and fine particles, and
a blend of long fibers and short fibers,
wherein at least a portion of the medium particles or coarse particles or
both swells in the presence of the oil-based drilling mud, and then
injecting a second spacer into the well.
16. A method of reducing lost circulation in a well, while drilling with oil-
based drilling mud, comprising:
injecting a first spacer, then
injecting a water-based composition comprising
an aqueous base fluid,
a mixture of coarse, medium and fine particles, and
a blend of long fibers and short fibers,
wherein at least a portion of the medium particles or coarse particles or
both swells in the presence of the oil-based drilling mud, into the well,
wherein the concentration or the length of the long fibers may initially
be zero and is increased during the injection, and then
injecting a second spacer into the well.
17. The method of claim 15 wherein the first spacer comprises a surfactant.
3 © 2010 MicroPatent, LLC

5. US20100152070A1 MicroPatent Report
DRILLING LOST CIRCULATION MATERIAL
[71] Applicant: N/A
[75] Inventors: Ghassemzadeh, Jaleh
[21] Application No.: US2009631934A
[22] Filed: 20091207
[43] Published: 20100617
[30] Priority: EP EP2008171405A 20081211 ...
Go to Fulltext Get PDF
[57] Abstract:
An engineered composition for reducing lost circulation in a well includes a
mixture of coarse, medium and optional fine particles, and a blend of long fibers
and short fibers. The long fibers are rigid and the short fibers are flexible. The
long fibers form a tridimensional mat or net in the lost-circulation pathway that
traps the mixture of particles and short flexible fibers to form a mudcake. The
mixture of particles and blend of fibers may be added to water-based and oil-based
drilling fluids. The composition, size, and concentration of each component of the
mixture of particles and blend of fibers may be fine-tuned for each application.
[52] US Class: 507212 507100 507117 507124 507200 507219 507221 507230
507231 507269 507270 507271 507277
[51] Int’l Class: C09K000858 C09K000802 C09K0008588
[52] ECLA: C09K0008506 C09K0008035 C09K0008504B C09K0008516
E21B002100M
4 © 2010 MicroPatent, LLC

6. US20100152070A1
[57] Claims:
1. A composition for reducing lost circulation in a well comprising a mixture
of coarse particles having an average particle size of from 300 to 1200 µm,
medium particles having an average particle size of from 20 to 150 µm and
optionally fine particles having an average particle size of from 5 to 15 µm,
and a blend of long fibers having an average length of from 8 to 15 mm and
short fibers having an average length of from 1 to 8 mm.
2. The composition of claim 1 wherein the mixture of particles comprises from
about 0 to about 15 weight percent fine particles, about 20 to about 40 weight
percent medium particles, and about 40 to about 60 weight percent coarse
particles.
3. The composition of claim 1 wherein the particles are selected from the
group consisting of alkaline earth carbonates, poly-
paraphenyleneterephthalamide, mica, rubber, polyethylene, polypropylene,
polystyrene, poly(styrene-butadiene), fly ash, silica, mica, alumina, glass,
barite, ceramic, metals and metal oxides, starch and modified starch, hematite,
ilmenite, microspheres, glass microspheres, magnesium oxide, gilsonite, sand,
and mixtures thereof.
4. The composition of claim 1 wherein the mixture of particles comprises about
8 to about 12 weight percent fine calcium carbonate, about 30 to about 40
weight percent poly-paraphenyleneterephthalamide, mica or calcium carbonate,
and about 45 to about 60 weight percent coarse calcium carbonate.
5. The composition of claim 1 wherein at least about 60 weight percent of the
mixture of particles is acid-soluble.
6. The composition of claim 1 wherein the fibers are selected from the group
consisting of polyvinyl alcohol, polyamide, aramid, para-aramid, polylactic
acid, polyglycolic acid, metals, painted metals, polymer-coated metals, hollow
metals, hollow painted metals, hollow coated metals, polypropylene,
polyethylene, polyester, polyamide, polyolefin, novoloid, phenol-aldehyde,
nylon, rayon, extruded mineral wool, carbon, basalt, asbestos, and glass.
7. The composition of claim 1 wherein the weight ratio of long fibers to short
fibers is from about 1:4 to about 4:1.
8. The composition of claim 7 wherein the length ratio of long fibers to short
fibers is from about 1 to about 3.
9. The composition of claim 1 wherein at least a portion of the fibers is acid-
soluble.
10. The composition of any of claim 1 wherein the long fibers comprise water-
insoluble polyvinyl alcohol and the short fibers comprise water-soluble
polyvinyl alcohol.
11. The composition of claim 1 wherein the short fibers comprise a mixture of
fibers of two different lengths.
12. The composition of claim 11 wherein the short fibers comprise a mixture of
5 © 2010 MicroPatent, LLC

7. US20100152070A1
two different lengths of polyvinyl alcohol fibers.
13. The composition of claim 11 wherein the short fibers comprise a mixture of
multiple lengths of polyaramid fibers.
14. A composition for reducing lost circulation in a well comprising a mixture
of coarse particles having an average particles size of from 300 to 1200 µm,
medium particles having an average particles size of from 20 to 150 µm and
optionally fine particles having an average particles size of from 5 to 15 µm,
and a blend of long fibers having an average length of from 8 to 15 mm and
short fibers having an average length of from 1 to 8 mm., and a drilling fluid.
15. The composition of claim 14 wherein the mixture of particles is added to
the drilling fluid at a concentration of from about 2.85 kg/m3to about 130
kg/m3.
16. The composition of claim 14 wherein the blend of fibers is added to the
drilling fluid at a concentration of from about 14 kg/m3to about 42 kg/m3.
17. The composition of claim 14 wherein at least a portion of the fibers is
coated with a material that improves the dispersion of the fibers in the
drilling fluid.
18. The composition of claim 14 wherein the drilling fluid is water-based, the
long fibers comprise water-insoluble polyvinyl alcohol and the short fibers
comprise polyaramid fibers, water soluble polyvinyl alcohol fibers, or magma
fiber.
19. The composition of claim 14 wherein the drilling fluid is oil-based and
the long fibers comprise water-insoluble polyvinyl alcohol or para-aramid.
20. The composition of claim 14 wherein the drilling fluid is oil-based, the
short fibers comprise para-aramid fibers and the long fibers comprise
polyaramid fibers.
21. The composition of claim 14 wherein the drilling fluid is oil-based, the
long fibers comprise non-water soluble polyvinyl alcohol fiber or magma fiber.
22. The composition of claim 14 wherein the long fibers comprise polyaramid
fibers or polyvinyl alcohol fibers.
23. The composition of claim 14 wherein the short fibers comprise a mixture of
two different lengths or a mixture of multiple lengths of fibers.
24. The composition of claim 14 wherein both the long fibers and the short
fibers comprise polyvinyl alcohol fibers.
25. A composition for reducing lost circulation in a well comprising a mixture
of coarse particles having an average particle size of from 300 to 1200 µm,
medium particles having an average particle size of from 20 to 150 µm and
fine particles having an average particle size of from 5 to 15 µm, and a
blend of fibers having a Young’s Modulus of greater than about 20 GPa.
26. The composition of claim 25 wherein the different rigid fibers each
comprise water-insoluble polyvinyl alcohol.
6 © 2010 MicroPatent, LLC

8. US20100152070A1
27. A method of reducing lost circulation in a well comprising adding a
mixture coarse particles having an average particles size of from 300 to 1200
µm, medium particles having an average particles size of from 20 to 150 µm
and optionally fine particles having an average particles size of from 5 to 15
µm and adding a blend of long fibers having an average length of from 8 to 15
mm and short fibers having an average length of from 1 to 8 mm, to a drilling
fluid and injecting the fluid into the well.
7 © 2010 MicroPatent, LLC

9. EP2196516A1 MicroPatent Report
LOST CIRCULATION MATERIAL FOR DRILLING FLUIDS
[71] Applicant: SCHLUMBERGER
SERVICES PETROL;
SCHLUMBERGER HOLDINGS; . . .
[72] Inventors: GHASSEMZADEH,
Jaleh, c/o Etudes et
Productions Schlumberger
[21] Application No.: EP2008171405A
[22] Filed: 20081211
[43] Published: 20100616
[30] Priority: EP EP2008171405A 20081211
Go to Fulltext Get PDF
[57] Abstract:
A composition for reducing lost circulation in a well includes a mixture of coarse,
medium and optional fine particles, and a blend of long fibers and short fibers.
The long fibers are rigid and the short fibers are flexible. The long fibers form a
mat or net in the lost-circulation pathway that traps the mixture of particles and
short flexible fibers to form a mudcake. The mixture of particles and blend of
fibers may be added to water-based and oil-based drilling fluids. The composition,
size, and concentration of each component of the mixture of particles and blend of
fibers may be fine-tuned for each application.
[52] US Class:
[51] Int’l Class: C09K0008035 E21B002100 C09K000803 C09K0008516
[52] ECLA: C09K0008506 C09K0008035 C09K0008504B C09K0008516
E21B002100M
8 © 2010 MicroPatent, LLC

10. EP2196516A1
[57] Claims:
1. A composition for reducing lost circulation in a well comprising a mixture
of coarse, medium and optional fine particles, and a blend of long fibers and
short fibers.
2. The composition of claim 1 wherein the fine particles have an average
particle size of from about 5 to about 15 microns.
3. The composition of claim 1 wherein the medium particles have an average
particle size of from about 20 to about 150 microns.
4. The composition of claim 1 wherein the coarse particles have an average
particle size of from about 300 to about 1200 microns.
5. The composition of any of the preceding claims wherein the mixture of
particles comprises from about 0 to about 15 weight percent fine particles,
about 20 to about 40 weight percent medium particles, and about 40 to about 60
weight percent coarse particles.
6. The composition of any of the preceding claims wherein the particles are
selected from the group consisting of alkaline earth carbonates, poly-
paraphenyleneterephthalamide, mica, rubber, polyethylene, polypropylene,
polystyrene, poly(styrene-butadiene), fly ash, silica, mica, alumina, glass,
barite, ceramic, metals and metal oxides, starch and modified starch, hematite,
ilmenite, microspheres, glass microspheres, magnesium oxide, gilsonite, sand,
and mixtures thereof.
7. The composition of any of the preceding claims wherein the mixture of
particles comprises about 8 to about 12 weight percent fine calcium carbonate,
about 30 to about 40 weight percent poly-paraphenyleneterephthalamide, and
about 45 to about 60 weight percent coarse calcium carbonate.
8. The composition of any of the preceding claims wherein at least about 60
weight percent of the mixture of particles is acid-soluble.
9. The composition of any of the preceding claims wherein the fibers are
selected from the group consisting of polyvinyl alcohol, polyamide, aramid,
para-aramid, polylactic acid, polyglycolic acid, metals, painted metals,
polymer-coated metals, hollow metals, hollow painted metals, hollow coated
metals, polypropylene, polyethylene, polyester, polyamide, polyolefin,
novoloid, phenol-aldehyde, nylon, rayon, extruded mineral wool, carbon, basalt,
asbestos, and glass.
10. The composition of any of the preceding claims wherein the long fibers are
rigid and the short fibers are flexible.
11. The composition of any of the preceding claims wherein the weight ratio of
long fibers to short fibers is from about 1:4 to about 4:1.
12. The composition of any of the preceding claims wherein the length ratio of
long fibers to short fibers is from about 1 to about 3.
13. The composition of any of the preceding claims wherein at least a portion
of the fibers is acid-soluble.
9 © 2010 MicroPatent, LLC

11. EP2196516A1
14. The composition of any of the preceding claims wherein the long fibers
comprise water-insoluble polyvinyl alcohol and the short fibers comprise water-
soluble polyvinyl alcohol.
15. The composition of any of the preceding claims wherein the short fibers
comprise a mixture of fibers of two different lengths.
16. The composition of claim 15 wherein the short fibers comprise a mixture of
two different lengths of polyvinyl alcohol fibers.
17. The composition of claim 15 wherein the short fibers comprise a mixture of
multiple lengths of polyaramid fibers.
18. A composition for reducing lost circulation in a well comprising a mixture
of coarse, medium and fine particles, a blend of long fibers and short fibers,
and a drilling fluid.
19. The composition of claim 18 wherein the mixture of particles is added to
the drilling fluid at a concentration of from about 2.85 kg/m3 to about 130
kg/m3.
20. The composition of claim 18 wherein the blend of fibers is added to the
drilling fluid at a concentration of from about 14 kg/m3 to about 42 kg/m3.
21. The composition of any of claims 18 to 20 wherein at least a portion of
the fibers is coated with a material that improves the dispersion of the
fibers in the drilling fluid.
22. The composition of any of claims 18 to 20 wherein the drilling fluid is
water-based, the long fibers comprise water-insoluble polyvinyl alcohol and
the short fibers comprise polyaramid fibers.
23. The composition of any of claims 18 to 20 wherein the drilling fluid is
oil-based and the long fibers comprise para-aramid.
24. The composition of any of claims 18 to 20 wherein the drilling fluid is
oil-based, the short fibers comprise para-aramid fibers and the long fibers
comprise polyaramid fibers.
25. The composition of any of claims 18 to 20 wherein the long fibers comprise
polyaramid fibers or polyvinyl alcohol fibers.
26. The composition of any of claims 18 to 20 wherein the short fibers
comprise a mixture of two different lengths or a mixture of multiple lengths
of fibers.
27. The composition of any of claims 18 to 20 wherein both the long fibers and
the short fibers comprise polyvinyl alcohol fibers.
28. A composition for reducing lost circulation in a well comprising a mixture
of coarse, medium and fine particles, and a blend of two different rigid
fibers.
29. The composition of claim 28 wherein the different rigid fibers comprise
fibers of different length or different diameter.
30. The composition of claim 28 wherein the different rigid fibers each
10 © 2010 MicroPatent, LLC

12. EP2196516A1
comprise water-insoluble polyvinyl alcohol.
31. A method of reducing lost circulation in a well comprising adding a
mixture of coarse, medium and optional fine particles, and adding a blend of
long fibers and short fibers, to a drilling fluid and injecting the fluid into
the well.
32. A method of reducing lost circulation in a well comprising adding a
mixture of coarse, medium and optional fine particles to the drilling fluid,
adding short fibers to the drilling fluid, adding long fibers to the drilling
fluid, and injecting the fluid into the well, wherein the concentration or the
length of the long fibers may initially be zero and is increased during the
treatment.
11 © 2010 MicroPatent, LLC

13. EP2085449A1 MicroPatent Report
CEMENT COMPOSITION COMPRISING MIXTURE OF ORGANIC
AND INORGANIC FIBRES FOR CURING SEVERE LOSSES
ESPECIALLY IN THE RESERVOIR SECTION
[71] Applicant: SCHLUMBERGER
SERVICES PETROL;
SCHLUMBERGER HOLDINGS; . . .
[72] Inventors: Ghassemzadeh,
Jaleh; Guiollard, France,
Etudes et Productions . . .
[No drawing]
[21] Application No.: EP2007150477A
[22] Filed: 20071228
[43] Published: 20090805
[30] Priority: EP EP2007150477A 20071228
Go to Fulltext Get PDF
[57] Abstract:
Disclosed is a method for controlling loss circulation and simultaneously
strengthening a weakened formation when drilling for oil. This invention relates to
the permeable subterranean formation and natural and induced fractured formations
that encounter severe losses and their treatment with a composition composed of
long rigid organic fibre with different type of fibres selected from a category of
organic or inorganic fibres along with different particle sizes that orientation of
fibres and packing of the solids shows a good blockage effect to resist the loss
and later the final set material develop required compressive strength to cure
those losses and strengthening the structure.
[52] US Class:
[51] Int’l Class: C04B001438 C09K0008487 C09K0008467 C04B001606
[52] ECLA: C09K0008467 C04B001446 C04B001446H8 C04B002802 C09K0008487
12 © 2010 MicroPatent, LLC

14. EP2085449A1
[57] Claims:
1. A cement composition comprising a mixture of a blend including cement
and/or micro cement, coarse particles, fibres; fine and coarse carbonate
particles and water; wherein the coarse particles comprise at least one
material with an average particle size of 300-1200 microns.
2. A composition as claimed in claim 1, wherein the coarse particles comprise
sand, granular weighing agent solids, lightweight particles, carbonates or
mixtures thereof.
3. A composition as claimed in claim 2, wherein the composition optionally
contains fine particles and is acidizable, wherein the coarse and/or fine
particles comprise carbonates and the weight ratio of carbonate to cement in
the blend is 1:1 to 2:1.
4. A composition as claimed in claim 2 or 3, wherein the carbonates comprise
calcium carbonate, marble, magnesium carbonate, dolomite or mixtures thereof.
5. A composition as claimed in any preceding claim, wherein the fibres
comprise organic and/or inorganic fibres.
6. A composition as claimed in claim 5, wherein the organic fibres comprise
polylactide fibres, water soluble polyvinyl alcohol fibres, water-insoluble
polyvinyl alcohol fibres, or mixtures thereof.
7. A composition as claimed in claim 6, comprising water-insoluble polyvinyl
fibres having a diameter of 0.2 mm to 0.66 mm and a length of 12 mm to 20 mm.
8. A composition as claimed in claim 6, comprising polyvinyl alcohol fibres
having a length of 1.5 mm to 6 mm that are water-soluble at temperatures of 20
to 100 degC.
9. A composition as claimed in claim 8, wherein the fibres have water
solubility in the temperature range of 90 to 100 degrees Celsius.
10. A composition as claimed in any preceding claim, wherein organic fibres
are present in an amount up to 7 lb/barrel.
11. A composition as claimed in claim 5, wherein the inorganic fibres are
present in an amount of up to 10 lb/barrel.
12. A composition as claimed in claim 5 or 11, wherein the inorganic fibres
comprise mineral oxide fibres.
13. A composition as claimed in claim 12, wherein the mineral oxide fibres are
coated with a monomolecular film of surfactant.
14. A composition as claimed in claim 12 or 13, wherein the mineral oxide
fibres comprise calcium oxide (CaO) and/or silicon dioxide (SiO2) fibres.
15. A composition as claimed in claim 12, 13 or 14, wherein the length of the
mineral oxide fibres is 0.1 mm to 16 mm
16. A composition as claimed in claim 15, wherein the length is 10 to 16 mm.
17. A composition as claimed in any of claims 12-16, wherein the mineral oxide
fibres have an average diameter of 7 to 10 microns.
18. A composition as claimed in any preceding claim, wherein the organic fibre
13 © 2010 MicroPatent, LLC

15. EP2085449A1
is acidizable and biodegradable and mineral fibre is acidizable.
19. A method of treating a well, comprising pumping a composition as claimed
in any preceding claim into the well and allowing it to set.
20. A method of making a composition as claimed in any of claims1-18,
comprising preparing a blend without fibres, mixing the blend with water to
form a slurry and adding polyvinyl alcohol fibres in an amount of 1 to 3
lb/barrel of the final slurry.
21. A method of making a composition as claimed in any of claims 1-18,
comprising preparing adding the components of the blend to form a mixture,
wherein mineral oxide fibres are added before the addition of cement.
14 © 2010 MicroPatent, LLC

16. EP2083059A1 MicroPatent Report
CEMENT COMPOSITIONS CONTAINING INORGANIC AND
ORGANIC FIBRES
[71] Applicant: SCHLUMBERGER
SERVICES PETROL;
SCHLUMBERGER HOLDINGS; . . .
[72] Inventors: Ghassemzadeh,
Jaleh; Zamora, Dominique,
c/o Schlumberger Riboud . . .
[No drawing]
[21] Application No.: EP2007150473A
[22] Filed: 20071228
[43] Published: 20090729
[30] Priority: EP EP2007150473A 20071228
Go to Fulltext Get PDF
[57] Abstract:
A cement composition, comprises a mixture of a blend of materials including cement
and/or micro cement, calcium carbonate, organic fibres, and inorganic fibres; and
water; wherein the composition forms a cement that is at least partially soluble in
acid and/or water. A method of treating a well, comprises pumping the composition
into the well, allowing the cement to set, and treating the set cement so that it
is partially to completely dissolved. In case of partial dissolution the residue in
time is degradable. The inorganic fiber can be used in the traditional cementing in
all stages of the well construction to defeat partial losses and improve the set
properties of the final set cement.
[52] US Class:
[51] Int’l Class: C04B001438 C09K0008487 C09K0008467 C04B001606
[52] ECLA: C09K0008467 C04B001446 C04B001446H8 C04B002802 C09K0008487
15 © 2010 MicroPatent, LLC

17. EP2083059A1
[57] Claims:
1. A cement composition, comprising a mixture of a blend of materials
including cement and/or micro cement, calcium carbonate, organic fibres,
and/or inorganic fibres; and water; wherein the cement composition fibres are
acid soluble or degradable by hydrolysis
2. A composition as claimed in claim 1, wherein the calcium carbonate has a
particle size of less than or equal to 300 microns.
3. A composition as claimed in claim 1 or 2, wherein the weight ratio of the
cement to calcium carbonate is approximately 1:1 to 1:2.
4. A composition as claimed in claim 1, 2 or 3, wherein the cement and calcium
carbonate have substantially similar particle sizes.
5. A composition as claimed in any preceding claim, comprising calcium
carbonate and/or micro-cement with a particle size of less than 15 microns
present in an amount of 10-15% by weight of blend; cement present in an amount
of 30-35% by weight of blend and calcium carbonate with a particle size of
less than to equal 300 microns present in an amount of 50-60% by weight of
blend.
6. A composition as claimed in claim 5, wherein the calcium carbonate and
micro cement have particle sizes less than 15 microns.
7. A composition as claimed in any preceding claim, wherein the organic fibres
are polylactic acid fibres.
8. A composition as claimed in claim 7, wherein the polylactic acid fibres are
released from the structure after acidization hydrolysis in the presence of
water.
9. A composition as claimed in claim 7 or 8, wherein the polylactic acid
fibres comprise a blend of different grades of fibre.
10. A composition as claimed in claim 7, 8 or 9, wherein the polylactide
fibres are of the same or different lengths from 0.5 to 12 mm.
11. A composition as claimed in any of claims 7-10, wherein polylactide fibre
is present in an amount of 0.1 to 15 lbs per barrel.
12. A composition as claimed in claim 11, wherein polylactide (PLA) fibre is
present in an amount of 0.5 to 5 lbs per barrel.
13. A composition as claimed in claim 12, wherein polylactide (PLA) fibres
is present in an amount of 0.5 to 3 lbs per barrel.
14. A compositions as claimed in any preceding claim, wherein the inorganic
fibres are in the form of nodules.
15. A composition as claimed in claim 14, wherein fibres in the nodules are
coated with a monomolecular film of surfactant.
16. A composition as claimed in claim 14 or 15, wherein the inorganic fibres
are mineral oxide fibres.
17. A composition as claimed in claim 16, wherein the mineral oxide fibres are
calcium oxide (CaO) and/or silicon dioxide (SiO2) fibres.
16 © 2010 MicroPatent, LLC

18. EP2083059A1
18. A composition as claimed in any preceding claim, further comprising other
solids, density control agents and liquid components for modifying the
property of the composition or the set cement produced by the composition.
19. A composition as claimed in any preceding claim, wherein magma fibre is
present in an amount of 0.1 to 15 lbs per barrel.
20. A composition as claimed in 19, where in magma fiber is present in an
amount of 0.5 to 5 lbs per barrel.
21. A composition as claimed in any preceding claim, wherein the organic
fibres comprise polyvinyl alcohol fibres.
22. A composition as claimed in claim 22, where in the polyvinyl alcohol
fibres are present in one length of between 4 - 6 mm, or as a blend of
different lengths of 1.5 mm and 4 - 6 mm lengths.
23. A composition as claimed in claim 21 or 22, wherein polyvinyl alcohol
fibre is present in an amount of 0.1 to 7 lbs per barrel.
24. A composition as claimed in claim 23, wherein polyvinyl alcohol fibre is
present in an amount of 0.5 to 5 lbs per barrel.
25. A composition as claimed in claim 24, wherein each polyvinyl alcohol
fibres is present in an amount of 0.5 to 3 lbs per barrel.
26. A method of treating a well, comprising pumping a composition as claimed
in any preceding claim into the well, allowing the cement to set, and treating
the set cement so that at least the fibre component is partially or completely
dissolved.
27. A method as claimed in claim 26, comprising treating the composition with
an acid.
28. A method as claimed in claim 27, wherein the acid comprises hydrochloric
acid.
29. A method as claimed in claim 27 or 28, further comprising treating the
composition with a solution containing predetermined metallic ions to catalyse
dissolution.
30. A method as claimed in any of claims 26-29, comprising placing a plug of
the composition in a region of the well suffering from fluid loss.
31. A method as claimed in any of claims 26-30, wherein both magma fibre and
polyvinyl alcohol fibre is present, acid dissolution being completed in one
step.
32. A method of making a compositions as claimed in any of claims 1 to 25,
wherein inorganic fibres are added to the blend before or after the addition
of cement.
33. A method as claimed in claim 32, wherein the fibre is added before
blending with cement.
34. A method of making a compositions of as claimed in any of claims 1-25,
wherein organic fibres are the last ingredient to be added to the composition
17 © 2010 MicroPatent, LLC

19. EP2083059A1
before it is pumped into a wellbore.
18 © 2010 MicroPatent, LLC

20. WO2010133302A1 MicroPatent Report
LOST CIRCULATION MATERIAL FOR OILFIELD USE
[71] Applicant: SCHLUMBERGER
SERVICES PETROL;
SCHLUMBERGER TECHNOLOGY BV; . . .
[72] Inventors: GHASSEMZADEH, Jaleh
[21] Application No.: WO2010EP2826A
[22] Filed: 20100429 [No drawing]
[43] Published: 20101125
[30] Priority: US US2009468232A 20090519 ...
Go to Fulltext Get PDF
[57] Abstract:
A composition for reducing lost circulation in a well, while drilling the well with
a drilling mud, which is composed of a base fluid, a mixture of particles, and a
blend of fibers. The composition is used by stopping drilling with the mud,
injecting a spacer, injecting the water-based composition, injecting a spacer, and
resuming drilling with the oil-based mud.
[52] US Class:
[51] Int’l Class: C09K0008508 C09K0008504 C09K0008516
[52] ECLA: C09K0008516 C09K0008504B C09K0008508
19 © 2010 MicroPatent, LLC

21. WO2010133302A1
[57] Claims:
Having thus described my invention, I claim:
1. A water-based composition for reducing lost circulation while drilling a
well with an oil-based drilling mud, the composition comprising an aqueous
base fluid, a mixture of coarse, medium and optional fine particles, and a
blend of long fibers and short fibers, wherein at least a portion of the
medium particles. or coarse particles or both swells in the presence of the
oil-based drilling mud.
2. The composition of claim 1 wherein the optional fine particles have an
average particle size of from about 5 to about 15 microns, the medium
particles have an average particle size of from about 20 to about 150 microns,
and the coarse particles have an average particle size of from about 300 to
about 2500 microns.
3. The composition of claim 1 wherein the mixture of particles comprises from
about 0 to about 15 weight percent fine particles, about 20 to about 40 weight
percent medium particles, and about 40 to about 60 weight percent coarse
particles.
4. The composition of claim 1 wherein at least about 60 weight percent of the
mixture of particles is acid-soluble.
5. The composition of claim 1 wherein the long fibers are rigid and the short
fibers are flexible.
6. The composition of claim 1 wherein the weight ratio of long fibers to short
fibers is from about 1 :4 to about 4:1.
7. The composition of claim 1 wherein at least a portion of the fibers is acid-
soluble.
8. The composition of claim 1 wherein the long fibers comprise water-insoluble
polyvinyl alcohol and the short fibers comprise water-soluble polyvinyl
alcohol.
9. The composition of claim 1 wherein the short fibers comprise a mixture of
fibers of two different lengths.
10. The composition of claim 1 wherein both the long fibers and the short
fibers comprise polyvinyl alcohol fibers.
11. The composition of claim 1 wherein the long fiber is polyvinyl alcohol and
the short fiber is an inorganic fiber.
12. The composition of claim 1 wherein the aqueous base fluid is a drilling
mud.
13. The composition of claim 1 wherein at least one of the long fibers and the
short fibers comprises a metal.
14. A water-based composition for reducing lost circulation while drilling a
well with an oil-based drilling mud, the composition comprising an aqueous
base fluid, a mixture of coarse, medium and optional fine particles, and a
blend of two different rigid fibers, wherein the different rigid fibers
20 © 2010 MicroPatent, LLC

22. WO2010133302A1
comprise fibers of different lengths or different diameters or different
compositions, wherein at least a portion of the medium particles or coarse
particles or both swells in the presence of the oil-based drilling mud.
15. A method of reducing lost circulation in a well, while drilling with an
oil-based drilling mud, comprising injecting a first spacer, then injecting a
water-based composition comprising an aqueous base fluid, a mixture of coarse,
medium and optional fine particles, and a blend of long fibers and short
fibers, wherein at least a portion of the medium particles or coarse particles
or both swells in the presence of the oil-based drilling mud, and then
injecting a second spacer into the well.
16. A method of reducing lost circulation in a well, while drilling with oil-
based drilling mud, comprising injecting a first spacer, then injecting a
water-based composition comprising an aqueous base fluid, a mixture of coarse,
medium and optional fine particles, and a blend of long fibers and short
fibers, wherein at least a portion of the medium particles or coarse particles
or both swells in the presence of the oil-based drilling mud, into the well,
wherein the concentration or the length of the long fibers may initially be
zero and is increased during the injection, and then injecting a second spacer
into the well.
17. The method of claim 15 wherein the first spacer comprises a surfactant.
21 © 2010 MicroPatent, LLC

23. WO2009083238A1 MicroPatent Report
CEMENT COMPOSITION COMPRISING MIXTURE OF ORGANIC
AND INORGANIC FIBRES FOR CURING SEVERE LOSSES
ESPECIALLY IN THE RESERVOIR SECTION
[71] Applicant: SCHLUMBERGER
SERVICES PETROL;
SCHLUMBERGER TECHNOLOGY BV; . . .
[72] Inventors: GHASSEMZADEH,
Jaleh; CARITEY, Jean-
Philippe; GUIOLLARD, France
[No drawing]
[21] Application No.: WO2008EP11091A
[22] Filed: 20081223
[43] Published: 20090709
[30] Priority: EP EP2007150477A 20071228 ...
Go to Fulltext Get PDF
[57] Abstract:
Disclosed is a method for controlling loss circulation and simultaneously
strengthening a weakened formation when drilling for oil. This invention relates to
the permeable subterranean formation and natural and induced fractured formations
that encounter severe losses and their treatment with a composition composed of
long rigid organic fibre with different type of fibres selected from a category of
organic or inorganic fibres along with different particle sizes that orientation of
fibres and packing of the solids shows a good blockage effect to resist the loss
and later the final set material develop required compressive strength to cure
those losses and strengthening the structure.
[52] US Class:
[51] Int’l Class: C04B001438 C09K0008487 C09K0008467 C04B001606
[52] ECLA: C09K0008467 C04B001446 C04B001446H8 C04B002802 C09K0008487
22 © 2010 MicroPatent, LLC

24. WO2009083238A1
[57] Claims:
Claims
1. A cement composition comprising a mixture of a blend including cement
and/or micro cement, coarse particles, fibres; fine and coarse carbonate
particles and water; wherein the coarse particles comprise at least one
material with an average particle size of 300-1200 microns.
2. A composition as claimed in claim 1, wherein the coarse particles comprise
sand, granular weighing agent solids, lightweight particles, carbonates or
mixtures thereof.
3. A composition as claimed in claim 2, wherein the composition optionally
contains fine particles and is acidizable, wherein the coarse and/or fine
particles comprise carbonates and the weight ratio of carbonate to cement in
the blend is 1:1 to 2:1 .
4. A composition as claimed in claim 2 or 3, wherein the carbonates comprise
calcium carbonate, marble, magnesium carbonate, dolomite or mixtures thereof.
5. A composition as claimed in any preceding claim, wherein the fibres
comprise organic and/or inorganic fibres.
6. A composition as claimed in claim 5, wherein the organic fibres comprise
polylactide fibres, water soluble polyvinyl alcohol fibres, water-insoluble
polyvinyl alcohol fibres, or mixtures thereof.
7. A composition as claimed in claim 6, comprising water-insoluble polyvinyl
fibres having a diameter of 0.2 mm to 0.66 mm and a length of 12 mm to 20 mm.
8. A composition as claimed in claim 6, comprising polyvinyl alcohol fibres
having a length of 1.5 mm to 6 mm that are water-soluble at temperatures of 20
to lOO degC.
9. A composition as claimed in claim 8, wherein the fibres have water
solubility in the temperature range of 90 to 100 degrees Celsius.
10. A composition as claimed in any preceding claim, wherein organic fibres
are present in an amount up to 7 Ib/barrel.
11.A composition as claimed in claim 5, wherein the inorganic fibres are
present in an amount of up to 10 Ib/barrel.
12. A composition as claimed in claim 5 or 11, wherein the inorganic fibres
comprise mineral oxide fibres.
13. A composition as claimed in claim 12, wherein the mineral oxide fibres are
coated with a monomolecular film of surfactant.
14. A composition as claimed in claim 12 or 13, wherein the mineral oxide
fibres comprise calcium oxide (CaO) and/or silicon dioxide (SiO2) fibres.
15. A composition as claimed in claim 12, 13 or 14, wherein the length of the
mineral oxide fibres is 0.1 mm to 16 mm
16. A composition as claimed in claim 15, wherein the length is 10 to 16 mm.
17. A composition as claimed in any of claims 12-16, wherein the mineral oxide
fibres have an average diameter of 7 to 10 microns.
23 © 2010 MicroPatent, LLC

25. WO2009083238A1
18. A composition as claimed in any preceding claim, wherein the organic fibre
is acidizable and biodegradable and mineral fibre is acidizable.
19. A method of treating a well, comprising pumping a composition as claimed
in any preceding claim into the well and allowing it to set.
20. A method of making a composition as claimed in any of claims1-18,
comprising preparing a blend without fibres, mixing the blend with water to
form a slurry and adding polyvinyl alcohol fibres in an amount of 1 to 3
Ib/barrel of the final slurry.
2 1.A method of making a composition as claimed in any of claims 1-18,
comprising preparing adding the components of the blend to form a mixture,
wherein mineral oxide fibres are added before the addition of cement.
24 © 2010 MicroPatent, LLC

26. WO2009083238A4 MicroPatent Report
CEMENT COMPOSITION COMPRISING MIXTURE OF ORGANIC
AND INORGANIC FIBRES FOR CURING SEVERE LOSSES
ESPECIALLY IN THE RESERVOIR SECTION
[71] Applicant: SCHLUMBERGER
SERVICES PETROL;
SCHLUMBERGER TECHNOLOGY BV; . . .
[72] Inventors: GHASSEMZADEH,
Jaleh; CARITEY, Jean-
Philippe; GUIOLLARD, France
[No drawing]
[21] Application No.: WO2008EP11091A
[22] Filed: 20081223
[43] Published: 20090827
[30] Priority: EP EP2007150477A 20071228 ...
Go to Fulltext Get PDF
[57] Abstract:
Disclosed is a method for controlling loss circulation and simultaneously
strengthening a weakened formation when drilling for oil. This invention relates to
the permeable subterranean formation and natural and induced fractured formations
that encounter severe losses and their treatment with a composition composed of
long rigid organic fibre with different type of fibres selected from a category of
organic or inorganic fibres along with different particle sizes that orientation of
fibres and packing of the solids shows a good blockage effect to resist the loss
and later the final set material develop required compressive strength to cure
those losses and strengthening the structure.
[52] US Class:
[51] Int’l Class: C04B001438 C09K0008487 C09K0008467 C04B001606
[52] ECLA: C09K0008467 C04B001446 C04B001446H8 C04B002802 C09K0008487
25 © 2010 MicroPatent, LLC

27. WO2009083236A4 MicroPatent Report
CEMENT COMPOSITIONS CONTAINING INORGANIC AND
ORGANIC FIBRES
[71] Applicant: SCHLUMBERGER
SERVICES PETROL;
SCHLUMBERGER TECHNOLOGY BV; . . .
[72] Inventors: GHASSEMZADEH,
Jaleh; CARITEY, Jean-
Philippe; ZAMORA, Dominique
[No drawing]
[21] Application No.: WO2008EP11089A
[22] Filed: 20081223
[43] Published: 20090827
[30] Priority: EP EP2007150473A 20071228 ...
Go to Fulltext Get PDF
[57] Abstract:
A cement composition, comprises a mixture of a blend of materials including cement
and/or micro cement, calcium carbonate, organic fibres, and inorganic fibres; and
water; wherein the composition forms a cement that is at least partially soluble in
acid and/or water. A method of treating a well, comprises pumping the composition
into the well, allowing the cement to set, and treating the set cement so that it
is partially to completely dissolved. In case of partial dissolution the residue in
time is degradable. The inorganic fiber can be used in the traditional cementing in
all stages of the well construction to defeat partial losses and improve the set
properties of the final set cement.
[52] US Class:
[51] Int’l Class: C04B001438 C09K0008487 C09K0008467 C04B001606
[52] ECLA: C09K0008467 C04B001446 C04B001446H8 C04B002802 C09K0008487
26 © 2010 MicroPatent, LLC

28. WO2009083236A1 MicroPatent Report
CEMENT COMPOSITIONS CONTAINING INORGANIC AND
ORGANIC FIBRES
[71] Applicant: SCHLUMBERGER
SERVICES PETROL;
SCHLUMBERGER TECHNOLOGY BV; . . .
[72] Inventors: GHASSEMZADEH,
Jaleh; CARITEY, Jean-
Philippe; ZAMORA, Dominique
[No drawing]
[21] Application No.: WO2008EP11089A
[22] Filed: 20081223
[43] Published: 20090709
[30] Priority: EP EP2007150473A 20071228 ...
Go to Fulltext Get PDF
[57] Abstract:
A cement composition, comprises a mixture of a blend of materials including cement
and/or micro cement, calcium carbonate, organic fibres, and inorganic fibres; and
water; wherein the composition forms a cement that is at least partially soluble in
acid and/or water. A method of treating a well, comprises pumping the composition
into the well, allowing the cement to set, and treating the set cement so that it
is partially to completely dissolved. In case of partial dissolution the residue in
time is degradable. The inorganic fiber can be used in the traditional cementing in
all stages of the well construction to defeat partial losses and improve the set
properties of the final set cement.
[52] US Class:
[51] Int’l Class: C04B001438 C09K0008487 C09K0008467 C04B001606
[52] ECLA: C09K0008467 C04B001446 C04B001446H8 C04B002802 C09K0008487
27 © 2010 MicroPatent, LLC

29. WO2009083236A1
[57] Claims:
Claims
1. A cement composition, comprising a mixture of a blend of materials
including cement and/or micro cement, calcium carbonate, organic fibres,
and/or inorganic fibres; and water; wherein the cement composition fibres are
acid soluble or degradable by hydrolysis
2. A composition as claimed in claim 1, wherein the calcium carbonate has a
particle size of less than or equal to 300 microns.
3. A composition as claimed in claim 1 or 2, wherein the weight ratio of the
cement to calcium carbonate is approximately 1:1 to 1:2.
4. A composition as claimed in claim 1, 2 or 3, wherein the cement and calcium
carbonate have substantially similar particle sizes.
5. A composition as claimed in any preceding claim, comprising calcium
carbonate and/or micro-cement with a particle size of less than 15 microns
present in an amount of 10-15% by weight of blend; cement present in an amount
of 30-35% by weight of blend and calcium carbonate with a particle size of
less than to equal 300 microns present in an amount of 50-60% by weight of
blend.
6. A composition as claimed in claim 5, wherein the calcium carbonate and
micro cement have particle sizes less than 15 microns.
7. A composition as claimed in any preceding claim, wherein the organic fibres
are polylactic acid fibres.
8. A composition as claimed in claim 7, wherein the polylactic acid fibres are
released from the structure after acidization hydrolysis in the presence of
water.
9. A composition as claimed in claim 7 or 8, wherein the polylactic acid
fibres comprise a blend of different grades of fibre.
10. A composition as claimed in claim 7, 8 or 9, wherein the polylactide
fibres are of the same or different lengths from 0.5 to 12 mm.
11. A composition as claimed in any of claims 7-10, wherein polylactide fibre
is present in an amount of 0.1 to 15 lbs per barrel.
12. A composition as claimed in claim 11, wherein polylactide (PLA) fibre is
present in an amount of 0.5 to 5 lbs per barrel.
13. A composition as claimed in claim 12, wherein polylactide (PLA) fibres
is present in an amount of 0.5 to 3 lbs per barrel.
14. A compositions as claimed in any preceding claim, wherein the inorganic
fibres are in the form of nodules.
15. A composition as claimed in claim 14, wherein fibres in the nodules are
coated with a monomolecular film of surfactant.
16. A composition as claimed in claim 14 or 15, wherein the inorganic fibres
are mineral oxide fibres.
17. A composition as claimed in claim 16, wherein the mineral oxide fibres are
28 © 2010 MicroPatent, LLC

30. WO2009083236A1
calcium oxide (CaO) and/or silicon dioxide (Siθ 2) fibres.
18. A composition as claimed in any preceding claim, further comprising other
solids, density control agents and liquid components for modifying the
property of the composition or the set cement produced by the composition.
19. A composition as claimed in any preceding claim, wherein magma fibre is
present in an amount of 0.1 to 15 lbs per barrel.
20. A composition as claimed in 19, where in magma fiber is present in an
amount of 0.5 to 5 lbs per barrel.
2 1. A composition as claimed in any preceding claim, wherein the organic
fibres comprise polyvinyl alcohol fibres.
22. A composition as claimed in claim 22, where in the polyvinyl alcohol
fibres are present in one length of between 4 - 6 mm, or as a blend of
different lengths of 1.5 mm and 4 - 6 mm lengths.
23. A composition as claimed in claim 2 1 or 22, wherein polyvinyl alcohol
fibre is present in an amount of 0.1 to 7 lbs per barrel.
24. A composition as claimed in claim 23, wherein polyvinyl alcohol fibre is
present in an amount of 0.5 to 5 lbs per barrel.
25. A composition as claimed in claim 24, wherein each polyvinyl alcohol
fibres is present in an amount of 0.5 to 3 lbs per barrel.
26. A method of treating a well, comprising pumping a composition as claimed
in any preceding claim into the well, allowing the cement to set, and treating
the set cement so that at least the fibre component is partially or completely
dissolved.
27. A method as claimed in claim 26, comprising treating the composition with
an acid.
28. A method as claimed in claim 27, wherein the acid comprises hydrochloric
acid.
29. A method as claimed in claim 27 or 28, further comprising treating the
composition with a solution containing predetermined metallic ions to catalyse
dissolution.
30. A method as claimed in any of claims 26-29, comprising placing a plug of
the composition in a region of the well suffering from fluid loss.
31. A method as claimed in any of claims 26-30, wherein both magma fibre and
polyvinyl alcohol fibre is present, acid dissolution being completed in one
step.
32. A method of making a compositions as claimed in any of claims 1 to 25,
wherein inorganic fibres are added to the blend before or after the addition
of cement.
33. A method as claimed in claim 32, wherein the fibre is added before
blending with cement.
34. A method of making a compositions of as claimed in any of claims 1-25,
29 © 2010 MicroPatent, LLC

31. WO2009083236A1
wherein organic fibres are the last ingredient to be added to the composition
before it is pumped into a wellbore.
30 © 2010 MicroPatent, LLC