CSP Smart Horizontal Drilling

1. CSP Smart Horizontal Drilling
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2. 2
Information of pre-existing fracture zone in the Bazhen
formation. West perspective area. Case of obvious
topology
Quantitative estimation of Diffractivity Density (DD). DD along the
horizontal section of wellbore versus Gas
Diffractivity
Density
Correlation between average value of DD and average
value of Gas along the horizontal section of wellbore

3. Optimal design trajectory of horizontal section of a wellbore based
on the information of pre-existing fracture
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CSP Smart Horizontal Drilling roadmap:
1. FractureCSP processing based on 3D CSP-
PSTM. Obtaining the 3D CSP-diffractors
cube in SEG-Y format.
2. Design of a set of admissible trajectories
of horizontal section of a wellbore
3. Calculation the Diffractivity Density
along the each probable trajectory
4. Search the optimal trajectory of
wellbore for multistage hydraulic
fracturing with the maximum value of
Diffractivity Density (yellow color – 467
units of DD sum along the section)
5. Microseismic monitoring multistage
fracturing with estimation of ports
productivity after fracturing based on
MicroseismicCSP Technology
Tight oil. Bazhen formation diffractivity map Oilfield Vientoskoe, cluster well #11, well #634G, 2013, Ugra
Horizontal section
Vertical section
Diffractivity density
curves

4. Design horizontal section of wellbore for some multistage
hydraulic fracturing along the pre-existing fracture zone
`
`
`
`
Main strain axes
Wellhead
X
Y
α
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Probability of accident
when α small

5. 5
Optimal design based on the information of principal stress axes
Depth - 2766 meters. Grid size - 100х100 meters. Red/blue – maximum/minimum stress axes at the seismic
emission points. The curved line - projection of a well borehole. Green triangles - geophones
Max horizontal stress
Min horizontal stress

6. Design horizontal section of wellbore for some multistage
hydraulic fracturing along the minimum strain
`
`
`
`
Main strain axes
Wellhead
Y
X 6
α

7. 7
Conclusions

8. 1. Optimal tight oil and shale gas development based on CSP-Approach assumes
simultaneous use of the following two methods :
 FractureCSP - for mapping pre-existing fracture
 MicroseismicCSP- for obtaining the principal stress axes during microseismic
monitoring of hydraulic fracturing
2. Models of pre-existing fracture zone and principal stress axes are used to design
the optimal well trajectory with the purpose to increase drainage area and to
decrease probability of accident
3. Application of suggested CSP Approach can significantly reduce cost of
development of tight oil and shale gas and will increase safety of works
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CSP Smart Horizontal Drilling Conclusions