渤中区块井壁稳定机理
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摘要
深井、超深井成为渤中区块开发的主力。该区块漏失、井壁坍塌等井壁失稳问题严重,给钻井作业带来了极大的挑战。结合已钻井的具体情况,对采集到的岩屑、岩心进行了室内实验分析;应用MATLAB软件模拟岩石坍塌压力分布情况;利用岩石力学相关理论,对泥岩吸水量随时间变化以及岩石强度在钻井液浸泡下的变化规律进行分析,模拟井壁稳定性周期,为今后该地区钻井作业过程中优化钻井设计提供了数据及理论支持。
Borehole stability has always been a problem that all oil fields have been trying to solve, and the cost caused by borehole instability is hundreds of millions yuan each year. With the overall development of Bozhong Block in Bohai Oilfield, deep wells and ultradeep wells are currently the main force for oilfield development. In Bozhong Block, The problems of borehole instability are serious, including leakage and borehole collapse, and they bring about great challenges to drilling operation. The collected cuttings and cores were experimentally tested and analyzed in consideration of the specific situations of drilled wells. Then, the distribution of rock collapse pressure was simulated by using MATLAB software. Finally, according to the theories related to rock mechanics, the borehole stability cycle was simulated by analyzing the water absorbing capacity of the shale over time and the change rule of rock strength in the immersion of drilling fluid. The research results provide the data and theoretical support for the drilling design optimization in the process of well drilling in Bozhong Block.
Borehole stability has always been a problem that all oil fields have been trying to solve, and the cost caused by borehole instability is hundreds of millions yuan each year. With the overall development of Bozhong Block in Bohai Oilfield, deep wells and ultradeep wells are currently the main force for oilfield development. In Bozhong Block, The problems of borehole instability are serious, including leakage and borehole collapse, and they bring about great challenges to drilling operation. The collected cuttings and cores were experimentally tested and analyzed in consideration of the specific situations of drilled wells. Then, the distribution of rock collapse pressure was simulated by using MATLAB software. Finally, according to the theories related to rock mechanics, the borehole stability cycle was simulated by analyzing the water absorbing capacity of the shale over time and the change rule of rock strength in the immersion of drilling fluid. The research results provide the data and theoretical support for the drilling design optimization in the process of well drilling in Bozhong Block.
引文
[1]杨庆民.北大港油田沙河街泥页岩井壁坍塌周期研究[D].东营:中国石油大学(华东),2009:14-18.
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[11]毛立丰,邹大鹏,陈赓,等.葡浅12-平1特浅稠油水平井钻井液技术[J].石油钻采工艺,2015,37(4):50-53.
[12]邱春阳,赵立新,司贤群,等.强抑制、抗高温防塌钻井液在董8井中的应用[J].石油钻采工艺,2015,37(4):45-49.
[13]张建斌,贾俊,刘兆利.长庆气田碳质泥岩防塌钻井液技术[J].钻井液与完井液,2018,35(3):68-73.
[14]孔勇,杨小华,徐江,等.抗高温强封堵防塌钻井液体系研究与应用[J].钻井液与完井液,2016,33(6):17-22.
[2]陈勉,金衍.深井井壁稳定技术研究进展与发展趋势[J].石油钻探技术,2005,33(5):28-34.
[3]屈展,王萍,吴学升,等.考虑泥页岩黏弹性的钻井液密度计算方法[J].石油钻采工艺,2017,39(1):33-36.
[4]沈伟,谭树人.大位移井钻井作业的关键技术[J].石油钻采工艺,2000,22(6):21-26.
[5]马德新,李嗣贵,李自立,等.中东某区块盐岩地层蠕变缩径的力学分析与应用[J].钻采工艺,2013,36(4):23-25.
[6]卢亚锋,林元华,唐庚,等.塔北隆起盐下油气藏井眼缩径研究[J].钻井液与完井液,2011,28(1):8-10.
[7]袁潇.一种树脂型降失水剂体系研究[D].成都:西南石油大学,2014:9-12.
[8]宋少博.大庆水平井防塌钻井液技术研究[D].大庆:东北石油大学,2012:33-36.
[9]张坤,刘南清,王强,等.强抑制封堵钻井液体系研究及应用[J].石油钻采工艺,2017,39(5):580-583.
[10]王树永.埕岛油田沙河街地层强抑制性海水钻井液技术[J].石油钻采工艺,2006,28(4):22-24.
[11]毛立丰,邹大鹏,陈赓,等.葡浅12-平1特浅稠油水平井钻井液技术[J].石油钻采工艺,2015,37(4):50-53.
[12]邱春阳,赵立新,司贤群,等.强抑制、抗高温防塌钻井液在董8井中的应用[J].石油钻采工艺,2015,37(4):45-49.
[13]张建斌,贾俊,刘兆利.长庆气田碳质泥岩防塌钻井液技术[J].钻井液与完井液,2018,35(3):68-73.
[14]孔勇,杨小华,徐江,等.抗高温强封堵防塌钻井液体系研究与应用[J].钻井液与完井液,2016,33(6):17-22.