解决W12-1北油田钻井井壁稳定问题的多学科实践
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摘要
针对W12-1北油田2003年底的第一批钻井中,因泥岩地层水化膨胀、地应力作用和钻井轨迹设计的合理性等多种原因引发的10多起较严重的钻井事故,从该油田的地质条件出发,利用国内外多种研究方法与手段,进行了地震数据再处理、岩心的古地磁应力测试、地层应力等势面的计算机模拟、井下岩心浸泡进行稳定周期预测等多学科、多角度的研究。研究结果包括引入井壁稳定的钻入临界角的概念,用经过测井数据反演处理后的较精确的地震数据图作为钻井轨迹设计参考的方法,利用模拟后的地应力图,较精确地预测井眼内易坍塌地层的应力与深度和厚度的技术,用化学与力学耦合原理开展预测井壁坍塌周期等综合性和一体化的研究。这些对该地区的钻井设计与钻井工艺提供了全新的认识。
A multi-disciplinary study was done on the drilling accidents arising from the formation hydration(and thus swelling),crustal stresses,and poor well trajectory design.This study involved the application of seismic data processing,the measurement of paleomagnetic stress on cores,computer simulation of the isopotential plane of the formation stresses,and the prediction of the stability periods of the downhole cores immersed in water.A "critical angle" concept relating to borehole stability was introduced into the research conclusion.The seismic data map,inversed from the log data,was used as a reference for well trajectory design.The formation stresses,the depth and the thickness of sloughing formations can be accurately determined using the well trajectory design method and the simulated crustal stresses.The chemistry-mechanics coupling was employed in predicting borehole sloughing period.A new knowledge concerning the drilling design and techniques in this area was obtained based on the studies.
A multi-disciplinary study was done on the drilling accidents arising from the formation hydration(and thus swelling),crustal stresses,and poor well trajectory design.This study involved the application of seismic data processing,the measurement of paleomagnetic stress on cores,computer simulation of the isopotential plane of the formation stresses,and the prediction of the stability periods of the downhole cores immersed in water.A "critical angle" concept relating to borehole stability was introduced into the research conclusion.The seismic data map,inversed from the log data,was used as a reference for well trajectory design.The formation stresses,the depth and the thickness of sloughing formations can be accurately determined using the well trajectory design method and the simulated crustal stresses.The chemistry-mechanics coupling was employed in predicting borehole sloughing period.A new knowledge concerning the drilling design and techniques in this area was obtained based on the studies.
引文
[1]韩文明.地震技术在复杂岩性油藏勘探与开发中的综合应用——以涠洲12-1油田北块为例.中国海上油气(地质),2003(5)
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[2]郭永峰,金晓剑.中海油田服务股份有限公司.确定钻井过程中严重沉砂段的方法及装置.中国国家专利,01123846.1.2001-06
[3]郭永峰,金晓剑.中海油田服务股份有限公司.水平井前进方向的预测方法、控制方法及其控制系统.中国国家专利,01124229.9.2001-06
[4]郭永峰,金晓剑.中海油田服务股份有限公司.确定钻井液密度的方法及控制钻井液密度的设备.中国国家专利,01131019.7.2001-06
[5]Ramos G G.Integrating Rock Mechanics with drillingstrategies in a Tectonic belt,Offshore Bali,Indonesia.SPE47286
[6]Stephen Edwards,BP America.Imaging unstable wellbores while drilling.SPE/IADC79846
[7]郭永峰,金晓剑,谭树人.非线性有限元在水平井中的应用.石油学报,1999,20(4):69-73
[8]于秀林,等.多元统计分析.中国统计出版社,1999
[9]郭永峰,金晓剑,谭树人.结构力学分析方法在南海水平井钻进预测中的应用.计算力学学报,18(1):88-93
[10]Guo Yongfeng.China National Offshore Oil Corpora-tion,Improvement on the Procedure in ExplorationWell By Unbalanced Drilling:A Case History in BS7Well in People’s Republic of China.SPE59263
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