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顺北油气田破碎性地层井壁稳定技术难题与对策
引用本文:王伟吉,李大奇,金军斌,徐江,张杜杰.顺北油气田破碎性地层井壁稳定技术难题与对策[J].科学技术与工程,2022,22(13):5205-5212.
作者姓名:王伟吉  李大奇  金军斌  徐江  张杜杰
作者单位:中国石化石油工程技术研究院
基金项目:国家自然科学(U19B6003-05);国家重点研发计划课题(2019YFA0708303)。
摘    要:近年来,顺北油气田多口井因钻遇破碎性地层出现了严重的井壁坍塌掉块情况,导致阻卡频繁,多口井回填侧钻,已成为顺北油田勘探开发的重大技术难题之一。统计分析了顺北油气田奥陶系破碎性地层复杂现状,针对破碎性地层技术难点,研究分析了其坍塌失稳机理,提出了安全钻井技术对策。失稳机理主要为受挤压构造影响,地层破碎,应力集中,加之地层高角度裂缝、层理等弱面发育,胶结性差,结构松散,极易发生剪切破坏,产生大面积坍塌失稳现象。钻井液应强化致密封堵、固结性能,提高地层完整性和岩石强度,适当提高钻井液密度,加强力学支撑作用,同时提高钻井液携带能力,保持井眼清洁。破碎性地层钻进时应尽量简化钻具,优化钻井参数,“少进多退”,保证井下安全。

关 键 词:破碎性地层  井壁稳定  碳酸盐岩  应力集中  钻井液
收稿时间:2021/9/7 0:00:00
修稿时间:2022/3/26 0:00:00

Technical Problems and Measures of Wellbore Stability of Broken Formation in Shunbei Oil and Gas Field
Wang Weiji,Li Daqi,Jiin Junbin,Xu Jiang,Zhang Dujie.Technical Problems and Measures of Wellbore Stability of Broken Formation in Shunbei Oil and Gas Field[J].Science Technology and Engineering,2022,22(13):5205-5212.
Authors:Wang Weiji  Li Daqi  Jiin Junbin  Xu Jiang  Zhang Dujie
Institution:SINOPEC Research Institute of Petroleum Engineering
Abstract:In recent years, many wells in Shunbei oil and gas field have encountered serious wellbore collapse due to drilling in broken formation, resulting in frequent jamming and many wells backfill sidetracking, which has become one of the major technical problems in the exploration and development of Shunbei oil and gas field. In this paper, we made statistics and analysis on the complicated situation of Ordovician broken formation in Shunbei oil and gas field. In view of the technical difficulties in the broken formation, we studied and analyzed the collapse and instability mechanism, and put forward the technical cmeasures for safe drilling. The instability mechanism is mainly affected by the extrusion structure, the stratum is broken and the stress is concentrated. In addition, the weak planes such as high angle micro fractures and bedding are developed, and the cementation is poor and the structure is loose. It is easy to shear failure and cause large area collapse and instability. The drilling fluid should strengthen the sealing and consolidation properties, improve the formation integrity and rock strength, appropriately increase the drilling fluid density, strengthen the mechanical support, and improve the carrying capacity of drilling fluid to keep the borehole clean. In order to ensure downhole safety, when drilling in broken formation, drilling tools should be simplified as much as possible, drilling parameters should be optimized, drilling strategy should be"less advance, more retreat".
Keywords:broken formation  wellbore stability  carbonate rock  stress concentration  drilling fluid
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