页岩气井地质工程套管变形类型及影响因素研究进展

doi:10.12108/yxyqc.20240501

Lithologic Reservoirs ›› 2024, Vol. 36 ›› Issue (5): 1-14.doi: 10.12108/yxyqc.20240501

• FORUM AND REVIEW • Previous Articles Next Articles

Research progress on casing deformation types and influencing factors in geological engineering of shale gas wells

YAN Jianping^1,2,3, LAI Siyu^1,2, GUO Wei⁴, SHI Xuewen⁵, LIAO Maojie⁵, TANG Hongming^1,2, HU Qinhong⁶, HUANG Yi⁷

1. School of Geoscience and Technology, Southwest Petroleum University, Chengdu 610500, China;
2. Sichuan Provincial Key Laboratory of Natural Gas Geology, Southwest Petroleum University, Chengdu 610500, China;
3. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation(Southwest Petroleum University), Chengdu 610500, China;
4. PetroChina Research Institute of Petroleum Exploration and Development, Beijing 100083, China;
5. Research Institute of Shale Gas, PetroChina Southwest Oil & Gas Field Company, Chengdu 610500, China;
6. Department of Earth and Environmental Sciences, University of Texas at Arlington, Arlington, TX 76019, USA;
7. Southwest Branch, CNPC Logging Company Limited, Chongqing 400021, China

Received:2023-05-08 Revised:2023-06-24 Online:2024-09-01 Published:2024-09-04

Abstract

Abstract: By investigating a large number of domestic and foreign literatures on casing deformation in shale gas wells，the types of casing deformation in shale gas wells were summarized，the differences and problems of influencing factors of casing deformation in deep and shallow shale gas wells were discussed，and the corresponding prevention measures and the main research directions in the next step were put forward. The results show that：（1）The types of casing deformation in shale gas wells mainly include squeezing diameter deformation and shear deformation. The probability of casing deformation in deep shale gas wells is greater than that in middle and shallow layers，and is mainly shear deformation.（2）The engineering factors that cause casing deformation include wellbore cooling，cementing quality，casing fatigue，casing quality and wellbore dogleg degree. The geological factors include rock mechanical properties，non-uniform in-situ stress stress and natural fracture/fault slip. The casing deformation of deep shale gas wells is mainly affected by natural fracture/fault slip.（3）Measures can be taken to reduce the risk of casing deformation，such as controlling wellbore temperature and injection strength，using cement with lower mechanical properties of cement sheath for cementing operation，appropriately reducing the outer diameter of casing，increasing wall thickness，improving steel grade，to improve casing quality，and smoothing well trajectory as far as possible. For deep shale gas wells，the risk of casing shear deformation can also be reduced by designing the extension direction of the horizontal section of the wellbore to be consistent with the bedding direction of the rock formation，mastering the fracture distribution，avoiding the high-risk shear slip section as much as possible，reasonably reducing the fracturing scale for different levels of slip risk sections，and adjusting the wellbore orientation.（4）The research directions of casing deformation prevention and control of shale gas wells mainly include four aspects：optimizing fracturing layers with good rock mechanical properties，analyzing the relationship between optimal well trajectory and in-situ stress，identifying and evaluating fractures，calculating fault slip and casing variables.

Key words: shale gas, casing deformation, shear deformation, hydraulic fracturing, natural fractures, fault slip, horizontal well, cementing operations, in-situ stress

CLC Number:

P618.13

YAN Jianping, LAI Siyu, GUO Wei, SHI Xuewen, LIAO Maojie, TANG Hongming, HU Qinhong, HUANG Yi. Research progress on casing deformation types and influencing factors in geological engineering of shale gas wells[J].Lithologic Reservoirs, 2024, 36(5): 1-14.

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Research progress on casing deformation types and influencing factors in geological engineering of shale gas wells

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