2. 1
What is it?
The SENTINEL Polished Rod Protection System is a revolutionary
patent pending PTFE (Teflon) bushing that is installed into the tubing
hanger and onto the polished rod inside a producing wellhead below
all surface control and prevention components of the wellhead
assembly yet allows for equipment to be run through without
problems.
It provides centralization for the polished rod to prevent metal to
metal contact with the production tubing below the tubing hanger. It
also provides support for the polished rod to prevent side loading the
stuffing box and premature wear of the stuffing box packing elements.
The system is comprised of two parts, SLEEVE and INSERT BUSHING,
which are matched to the production tubing ID, tubing hanger ID, BHP
and polished rod OD.
Benefits and Properties
• Virtually resistant to all chemicals.
• Excellent wear resistance and provides a low coefficient of friction.
• Will not damage wellhead or production components
• Very wide temperature range to allow for servicing the well without
damaging the bushing (-73°C to 204°C).
• Helical fluting allows for production fluid by-pass without high
pressure differentials (144m³/day with 100kPa differential), and
allows for polished rod supporting on the full length of the bushing.
• Cost effective repair for polished rod scoring and premature and
excessive packing wear
• Low cost initial install to prevent polished rod scoring from time of
initial completion through the life of the well.
3. 2
Available sizes
Sleeve part number and sizes:
TPGS-6030-4800 – 60.3mm (2.375”) EUE X 48mm seating bore
TPGS-7300-4800 – 73.0mm (2.875”) EUE X 48mm seating bore
TPGS-7300-6000 – 73.0mm (2.875”) EUE X 60mm seating bore
TPGS-8890-4800 – 88.9mm (3.50”) EUE X 48mm seating bore
TPGS-8890-6000 – 88.9mm (3.50”) EUE X 60mm seating bore
TPGS-8890-7200 – 88.9mm (3.50”) EUE X 72mm seating bore
Insert Bushing part number and sizes
TPGI-4800-3175 – 48mm X 32mm (1.25”) rod bore
TPGI-6000-3175 – 60mm X 32mm (1.25”) rod bore
TPGI-6000-3800 – 60mm X 38mm (1.50”) rod bore
TPGI-7200-3175 – 72mm X 32mm (1.25”) rod bore
TPGI-7200-3800 – 72mm X 38mm (1.50”) rod bore
TPGI-7200-4450 – 72mm X 44.5mm (1.75”) rod bore
**Custom sizes and threading available to customer request
Other available services
We are IRP #7 compliant and can complete your installation by
organizing the crews, performing the installation and returning the
well back to operations. We have 30 years oilfield experience
including wellsite supervision for completions, work-overs,
production work. We also have extensive experience in downhole tool
installation and pumping / stimulation experience.
4. 3
History
While attempting to fix a well with major polished rod scoring, it was
found that the surface wellhead equipment was not square to the sub-
surface tubulars. This created a deviation between the wellhead and
the sub-surface production tubing. The pumpjack is designed to
stroke the polished rod in a true vertical fashion. This minor deviation
at ground level was found to be approximately 3.0°. Other installs
were found to have slightly less of a deviation (+/-1°) depending on
well design for possible polished rod contact. Another factor into
some of the scoring issues was pumpjack alignment and sometimes
both.
Over the length of the polished rod, while the pumpjack was stroking
the rod string, at the bottom of the rod stroke the polished rod was
>8m below the stuffing box. The space between the OD of the polished
rod and the ID of the tubing was reduced to nil as the polished rod
was no longer running true vertical below ground but trying to run in-
line with the deviation, creating metal to metal contact and polished
rod scoring.
All available sucker rod centralizing equipment was used in an
attempt to solve the problem with the scoring to no avail. Through
trial and error on many wells it was also found that after the initial
start-up, there were no signs of polished rod scoring and it was not
long before the scoring started to become evident. On inspection of
the pony rods below the polished rod it was found that the guides
were worn to the point that the polished rod was able to contact the
production tubing ID creating the score.
The SENTINEL Polished Rod Protection System was conceived,
prototyped and installed to prevent the scoring on some major
problem wells to test the viability of the system and continues to
perform above expectation. It is a valuable piece of affordable
equipment that can be installed into the wellhead at the start of the
well. Prevention rather than reaction is always more cost effective.
5. 4
Installation History
Well #1 – Major polished rod scoring issues. Multiple polished rod
changes, wellhead and pumpjack realignment as well as sucker rod
centralization equipment used prior to SENTINEL install.
Date of well startup – Jan/13,
Date of SENTINEL Install - July/15, >1 year in service
Polished rods changed prior to SENTINEL install = 8,
Approximate cost >$1M
Polished rods changed since SENTINEL install = 0
Well#2 – New well that began to score shortly after well had been
producing.
Date of well startup – Nov/14
Date of SENTINEL install – Jan/15, 8 months in service
Polished rods changed prior to SENTINEL install = 3
Approximate cost <$30K
Polished rods changed since SENTINEL install = 0
Well #3 – New well that scored the polished rod within the first hour
of production.
Date of startup – Jan/15
Date of SENTINEL install – Jan/15, 8 months in service
Polished rods changed prior to SENTINEL install=1
Approximate cost <$10K
Polished rods changed since SENTINEL install = 0
Well #4 – Problem well that had numerous work-overs to attempt to
solve the scoring issue. Two joints larger tubing ran at surface to
attempt to allow more clearance between the polished rod OD and the
tubing ID.
Date of startup – Mar/13
Date of SENTINEL install – Jun/15, < 3 months in service
Polished rod changed prior to SENTINEL install = 7
Approximate cost >$90K
Polished rods changed since SENTINEL install = 0
6. 5
In 4 wells, if the SENTINEL Polished Rod Protection System had been
available and installed it could have saved the prime contractor large
amount of downtime and costs.
Historically it has been found that mobilizing crews to perform one
polished rod change in a day ranges $10,000 - $17,000 depending if
your BHP has to be tripped out of the well due to seizing or other
potential problems with unseating and extent of damaged sucker rod
equipment.
Other benefits
The SENTINEL Polished Rod Protection System not only protects the
polished rod, which is the most expensive of the rods installed into the
well, but while the polished rod is being centralized at the tubing
hanger, it is also providing centralization up through the wellhead and
stuffing box alleviating side loading of the stuffing box elements,
which save the operator field maintenance costs down the road in
terms of stuffing box packing changes and crews to perform the
changes.
Operators have the chance to save big costs with one affordable
install, as one system install saves $10,000 - $17,000 on one scored
polished rod. The SENTINEL Polished Rod Protection System then
becomes a valuable asset in the design of the wellhead, pump and
rods.
After the SENTINEL Polished Rod Protection System install, the
“insert bushing” is the only component that would require
replacement after it wears down to the wear indicators. The wear
indicators were designed and implemented to allow operators, during
their runs, to visually inspect the polished rod for indications of a
vertical brass discoloration on the polished rod from the indicators, as
this is the only way to tell whether the insert bushing is wearing out.
The cost of replacing an insert bushing costs considerably less than
changing a polished rod.
7. 6
Where do you get it?
For more information,
Colenutt Contracting Services Ltd.
Phone : (780)778-0550
E-mail : colecon@telus.net
Website: colenuttcontracting.com
Linkedin: Chris Colenutt
Facebook: Sentinel Polished Rod
protection System
Presently looking for a distributor in your area for
that one call convenience that allows you to receive
all your supplies from one supplier.
8. 7
To: Chris Colenutt
Re: Sentinel Polished Rod Protector
We have installed four systems to date and have seen great improvements on our run times.
Scored polished rods have been an issue in the past. Numerous attempts have been made to
correct the issue with limited success. Upon installation of the Sentinel Polished Rod Protector
system, the issues have been reduced.
I was personally on location when one of the systems was installed. The pump jack was aligned
and roller guides were installed. This reduced the scoring but it was still evident. As soon as the
system was installed the scoring disappeared. The installation on this particular well was
installed 8 months ago and there has been no issues since.
Currently our longest running system was installed 13 months ago. We have not seen any issues
since the installation.
Regards,
Glen Klein, P.Eng
Service Rig Coordinator, AB/BC
CELL 780.898.6760 | DIRECT 780.514.7061 | MAIN 780.514.7050 | FAX 780.542.2609
