非地层滑移因素下套管变形修复技术研究

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中图分类号：TE256 文献标识码：A DOI：10.12473/CPM.202501031

Abstract：During thehorizontal-wellhydraulic fracturing inthe Mahu Oilfield，thedeformationanddamage of casings have become significantly more pronounced due to high-pressure fluid injection and complex in-situ stress，severely compromising wellbore integrity and subsequent operations．In comparison to formation-slipinduced casing deformation，non-formation-slip-induced casingdeformation presents greater feasibilityforrepair technologies.Thisstudydesignsaninnovativecasingrepair toolforaddressing thenon-formation-slip-induced deformation in the Mahu Oilfield.Basedon this tol，theevaluation models forcasing repair effciencyand strength variation were developed and validated.Through numerical simulation analysis，the required repair force， casing strength variationbeforeandafterrepair，andtherepaireficiencyof thetoolwere investigated.Theresults indicate that therepair tool performs effectivelyand reliably when the repair force is greater than 114.003kN （corresponding to a hydraulic pressure of 23.603MPa provided by the hydraulic cylinder）.The repaired casing has the average wall thickness of 8.59mm and the external extrusion strength of 45.86MPa （as 64.08% of the intact casing），in contrast to 9.09mm and 92.90MPa of the deformed casing.Furthermore，the repair tool can restore the average cross-sectional area of the casing from 3.42×10-3m2 to 8.93×10-3n n²，representing an increase of 0.51×10-3m2 ，and indicating an average repair efficiency of 60.30% .The study provides a theoretical reference for treating casing deformation during fracturing operations in theMahu Oilfield.

Keywords：Mahu Oilfield；casing repair；non-formation-slip；casing deformation； finite element simula tion；strength assessment；repair efficiency

0 引言

近年来，随着非常规油气资源开发的不断推进，我国在致密油气藏领域取得了显著进展[1-2]。（剩余12081字）