Cause analysis of casing deformation in fracturing of horizontal wells in Weirong deep shale gas field

QIAO Zhiguo; YE Cuilian

doi:10.13809/j.cnki.cn32-1825/te.2021.02.012

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Cause analysis of casing deformation in fracturing of horizontal wells in Weirong deep shale gas field
Issue 2, Pages: 89-95(2021)
Published：2021
DOI： 10.13809/j.cnki.cn32-1825/te.2021.02.012
稿件说明：

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[1]乔智国,叶翠莲.威荣深层页岩气水平井压裂套变原因分析[J].油气藏评价与开发,2021,11(02):89-95. DOI： 10.13809/j.cnki.cn32-1825/te.2021.02.012.

QIAO Zhiguo, YE Cuilian. Cause analysis of casing deformation in fracturing of horizontal wells in Weirong deep shale gas field[J]. Petroleum Reservoir Evaluation and Development, 2021, (2): 89-95. DOI： 10.13809/j.cnki.cn32-1825/te.2021.02.012.

摘要

针对四川盆地威荣页岩气开发过程中出现的套管变形问题

统计分析了套管变形特征

利用有限元分析方法对3种套变形态进行载荷和变形量分析

探讨了威荣页岩气套管变形类型;采用理论分析、有限元模拟、等效试验评价等方法

对钻完井工程涉及的井身全角变化率、固井质量、井筒温压变化、瞬时停泵等工程参数开展了量化分析

得到了不同工程因素对套管强度减弱的影响

表明工程因素不是套管变形的主要因素;通过开展改造过程中地层各向异性、井筒温度压力耦合、储层岩性界面影响等综合因素分析

认为工程条件下套管强度减弱

压裂改造过程中地层薄弱面滑移或储层对套管产生非均布挤压载荷导致套管应力集中而变形

其相关认识为制定威荣页岩气套变防控措施提供了借鉴。

Abstract

Casing deformation occurs frequently during the development of the Weirong Shale Gas Field in the Sichuan Basin.In order to solve this problem

analysis on load and deformation degree of three casing deformation has been carried out by finite element method to discuss the deformation type.Meanwhile

by means of theoretical analysis

finite element simulation and equivalent test evaluation

the quantitative analysis is carried out on the parameters such as the overall angle change rate

cementing quality

wellbore temperature-pressure change and instantaneous stop pump.The influence of different engineering factors on casing strength weakening shows that the engineering factors are not the main factors of casing deformation.According to the analysis of comprehensive factors in the transformation process such as formation anisotropy

wellbore temperature-pressure coupling and reservoir lithologic interface

it is considered that the casing strength decreases under engineering conditions

"while in the process of fracturing

the slip of " weak strata or the non-uniform compression load of reservoir on casing leads to casing stress concentration and deformation.The relevant understanding provides a reference for the formulation of casing deformation prevention and control measures of Weirong Shale Gas Field.