白马区块页岩气水平井断层滑移对射孔套管应力影响研究

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中图分类号：TE925文献标识码：ADOI：10.12473/CPM.202408055

Abstract：Casing deformation seriously restricts the development and utilization of shalegas in Baima block. To clarify the stress variation lawof perforated casing under fault slip，study was conducted using acombination of field investigation and numerical simulation.Afterhaving comprehensivelyconsidered thefault slip angle，slip distance and casing perforation parameters，a numerical simulation model of perforated casing-cement sheath-slip formation was built to conduct finite element simulation test and study the stress variation law of perforated casing under fault slip.The study results show that 83% of casing deformation occurs during the fracturing operation in the Baima block，and 44% of casing deformation points are located in the perforated section. Hydraulic fracturing leadsto fault fracture activity，which in turn induces fault slipand causes casing deformation.In the process of fault slip，the stress variation lawof perforated casing is similartothatofblank casing.As theslippage increases， the casing stress increases gradually.As the slip angle increases，the casing stress increases first and then decreases，and the casing stress is the largest when the dip angle is 60∘ . When considering perforation parameters， the greater the perforation diameter and perforation density，the greater the casing stress.Compared with blank casing，whenthe slippage is1mm，thecasing stress is greatlyaffcted by perforation，andthe mean stress of the perforated casing is1.5 times that ofthe blank casing.As the slippage and slipangle increase，the fault slip becomes the main factor affecting casing stress.The study results provide ideas and theoretical basis forthe optimization of casing perforation parameters under fault slip and the investigation of deformation mechanism of shale gas casing.

Keywords： shale gas；casing deformation; numerical simulation; fault slip；perforation； Baima block

0 引言

涪陵页岩气田是国内第一个实现商业开发的页岩气田[1]，其中白马区块探明储量1048.83亿 m3 具有极大的开采利用价值。（剩余13355字）