Study on Wellbore Instability of Bedded Shale Gas Horizontal Wells under Chemo-Mechanical Coupling

DENG Yuan; HE Shiming; DENG Xianghua; PENG Yuanchun; HE Shiyun; TANG Ming

doi:10.11911/syztjs.2020010

Volume 48 Issue 1

Feb. 2020

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Petroleum Drilling Techniques > 2020 > 48(1): 26-33. > DOI: 10.11911/syztjs.2020010

DENG Yuan, HE Shiming, DENG Xianghua, PENG Yuanchun, HE Shiyun, TANG Ming. Study on Wellbore Instability of Bedded Shale Gas Horizontal Wells under Chemo-Mechanical Coupling[J]. Petroleum Drilling Techniques, 2020, 48(1): 26-33. DOI: 10.11911/syztjs.2020010

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Study on Wellbore Instability of Bedded Shale Gas Horizontal Wells under Chemo-Mechanical Coupling

1.
State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation (Southwest Petroleum University), Chengdu, Sichuan, 610500, China
2.
Safety Environment Quality Surveillance and Inspection Research Institute, CNPC Chuanqing Drilling Engineering Co., Ltd., Guanghan, Sichuan, 618300, China
3.
Drilling & Production Technology Research Institute, CNPC Chuanqing Drilling Engineering Co., Ltd., Guanghan, Sichuan, 618300, China
4.
Downhole Operation Branch, Sinopec Southwest Oilfield Service Corporation, Deyang, Sichuan, 618000, China

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Received Date: May 08, 2018
Revised Date: December 09, 2019
Available Online: January 08, 2020

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Abstract

Abstract

In view of the fact that most of the existing chemo-mechanical coupling analysis of the wellbore stability in shale gas horizontal wellsonly considered the influence of hydration on rock strength, but rarely considered the influence of hydration strain and stress, this paper, based on the theories of elasticity and rock mechanics, and by considering the weakening effect of hydration on rock mechanical parameters and the additional hydration stress, established the prediction model of wellbore collapse pressure of bedded shale gas horizontal wells under chemo-mechanical coupling, studied the mechanism of wellbore instability of bedded shale gas horizontal wells, and analyzed the factors affecting wellbore stability and their influencing laws. The results showed that when there was a bedding plane, the collapse pressure would increase greatly; the wellbore stability was the best when drilling along the bedding plane; when the hydration time was fixed, the collapse pressure would decrease with the increase of the radial distance from the wellbore, and the longer the hydration time was, the larger the area near the wellbore that was prone to collapse would be; and after considering the influence of the hydration stress, the collapse pressure increased greatly, sothe influence of hydration stress could not be ignored when designing the drilling fluid density. The research results enriched the wellbore instability theories of shale gas horizontal wells, and played a guiding role in the drilling design of bedded shale gas horizontal wells.
- shale gas,
- horizontalwell,
- hydration,
- bedding plane,
- hole stabilization,
- collapse pressure

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