A Method for Accurate Calculation of Pore Pressure in Fractured Formations of Shale Gas Reservoirs

WANG Yi

doi:10.11911/syztjs.2020056

Volume 48 Issue 3

Jun. 2020

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Petroleum Drilling Techniques > 2020 > 48(3): 29-34. > DOI: 10.11911/syztjs.2020056

WANG Yi. A Method for Accurate Calculation of Pore Pressure in Fractured Formations of Shale Gas Reservoirs[J]. Petroleum Drilling Techniques, 2020, 48(3): 29-34. DOI: 10.11911/syztjs.2020056

Citation:

WANG Yi. A Method for Accurate Calculation of Pore Pressure in Fractured Formations of Shale Gas Reservoirs[J]. Petroleum Drilling Techniques, 2020, 48(3): 29-34. DOI: 10.11911/syztjs.2020056

Citation:

WANG Yi. A Method for Accurate Calculation of Pore Pressure in Fractured Formations of Shale Gas Reservoirs[J]. Petroleum Drilling Techniques, 2020, 48(3): 29-34. DOI: 10.11911/syztjs.2020056

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A Method for Accurate Calculation of Pore Pressure in Fractured Formations of Shale Gas Reservoirs

WANG Yi^{1, 2,}

1.
State Key Laboratory of Shale Oil and Gas Enrichment Mechanisms and Effective Development, Beijing, 100101, China
2.
Sinopec Research Institute of Petroleum Engineering, Beijing, 100101, China

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Received Date: December 07, 2019
Revised Date: April 02, 2020
Available Online: April 14, 2020

Graphical Abstract

Abstract

Abstract

When drilling through the fractured formations of a shale gas reservoir, the formation pressure will exhibits a significant difference from normal pressure as well as after fracturing. It is hard to obtain accurate formation pore pressure in fractured formations of shale gas reservoirs by using traditional pore pressure prediction methods. To tackle this problem, we analyze the causes of dynamic changes in formation pressure in fractured formations under different operating conditions. We also analyze the large increase of formation pressure after shale gas reservoirs stimulation. Based on those analyses, we propose a method of calculating pore pressure change in both naturally fractured and stimulated shale gas reservoirs. Applying the method shows it has asimple principle and clear mechanism, and gives results which highly agree with those from field tests. As an effective method for accurately calculating dynamic pore pressure in fractured formations of shale gas reservoirs, this method offers high practical value.
- shale gas reservoir,
- natural fracture,
- artificial fracture,
- pore pressure

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References

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