油藏开发对井壁稳定性的影响研究  

EFFECT OF PRESSURE DEPLETION ON WELLBORE STABILITY WITH CONSIDERATION OF IN-SITU STRESS ORIENTATION VARIATION

作　　者：袁俊亮[1] 邓金根[1] 蔚宝华[1] 谭强[1] 赵凯[1] 肖坤[1] 周昊 

机构地区：[1]中国石油大学石油工程学院·北京 [2]中海油安全技术服务有限公司

出　　处：《钻采工艺》2012年第5期4-6,共3页Drilling & Production Technology

基　　金：国家自然科学基金“泥页岩井壁坍塌的力学化学耦合研究”(51174219);国家科技重大专项“复杂结构井优化设计与控制关键技术”(2011ZX05009-005)

摘　　要：许多油气田在开发中后期都会面临储层压力衰竭问题,孔隙压力的降低将导致水平地应力大小和方位均发生变化,进而会影响定向井的井壁稳定性。利用某油田储层的岩石力学参数,计算了压力衰竭前后水平地应力大小和方位的变化,分析了定向井钻井过程中井壁失稳风险分布规律。结果表明,就定向井安全钻井方位而言,考虑孔隙压力衰竭对地应力方位的影响,与过去未考虑该因素时得出的结论相比有较大差异。研究结果可以为压力衰竭油气田的定向井钻井设计提供参考。Many oil and gas fields faced pressure depletion problem during later stage of development.The pressure depletion can cause both the magnitude and orientation change of in-situ stress,and has further influences on the wellbore stability of directional well.This paper calculated and analyzed the magnitude and the orientation change of in-situ stress before and after pressure depletion using rock mechanics parameter of certain oilfield,and the laws of wellbore unstability were analyzed during drilling directional well.Calculation results showed that there was a relative large difference in the safe-drilling orientation between with and without consideration of in-situ stress azimuth change caused by pressure depletion.The research conclusions could provide reference for drilling design of directional well in depleted reservoirs.

关 键 词：压力衰竭 地应力 方位变化 定向井 井壁稳定 开发 

分 类 号：TE21[石油与天然气工程—油气井工程]