Zeng Bo,Li Rui,Shen Cheng,et al.Safety evaluation method for casing running in deep shale gas horizontal wells[J].China Petroleum Machinery,2025,53(10):40-47.
Zeng Bo,Li Rui,Shen Cheng,et al.Safety evaluation method for casing running in deep shale gas horizontal wells[J].China Petroleum Machinery,2025,53(10):40-47.DOI: 10.12473/CPM.202409047.
Safety Evaluation Method for Casing Running in Deep Shale Gas Horizontal Wells
To address issues such as passability and pre-fracturing casing deformation during casing running operation in deep shale gas wells, the beam-column infinitesimal method was used to build a mechanical model for trajectory of casing running in crooked hole. The differential method was used to determine the calculation methods of allowable annular clearance of casing free running, critical bending angle of forced running, safety strength of running and running resistance. Finally, taking a deep shale gas horizontal well in southern Sichuan Basin as an example, the safety evaluation method for casing running in deep shale gas horizontal wells was verified. The research results show that the minimum allowable annular clearance of casing free running is greater than the actual annular clearance in the build-up bypassing obstacle section and the build-up entering target section, and it is necessary to force the casing to run into the crooked hole section. The bending stress of the casing shall not exceed the yield limit of the pipe; otherwise, it may induce deformation of casing before fracturing. The casing running resistance presents a trend of alternating rise and fall with the increase of deviation angle. The research results provide ideas for the safety evaluation of casing running in deep shale gas horizontal wells.
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