渤海油田随钻地层压力监测dc指数法改进及应用
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摘要
为克服异常地层高压给井场钻井作业带来的安全风险,渤海油田通常采用随钻地层压力监测技术,但该项技术中dc指数模型不适用于渤海油田使用的PDC钻头,研究人员基于修正后的杨格钻速方程,结合现场实钻数据研究,重新构建了渤海油田PDC钻头的地层可钻性模型dr。应用该模型成功识别了渤中凹陷某探井的异常高压带,并可计算模拟地层压力曲线为现场合理选择钻井液密度提供依据,确保了井下安全并成功完成了油藏地质勘探任务。
In order to overcome the safety risk brought by abnormal formation high pressure to well site drilling operation,the technology of formation pressure monitoring while drilling is usually used in Bohai Oilfield.However,dc index model in this technology is not suitable for PDC bit used in Bohai Oilfield.The formation drillability model dr of PDC bit in Bohai Oilfield was reconstructed based on the modified Young′s drilling rate equation and field real drilling data.The abnormal high pressure zone of an exploration well in Bozhong sag was successfully identified by using this model,and the formation pressure curve can be calculated and simulated to provide the basis for reasonable selection of drilling fluid density in the field,so as to ensure downhole safety and successful completion of geological reservoir exploration tasks.
In order to overcome the safety risk brought by abnormal formation high pressure to well site drilling operation,the technology of formation pressure monitoring while drilling is usually used in Bohai Oilfield.However,dc index model in this technology is not suitable for PDC bit used in Bohai Oilfield.The formation drillability model dr of PDC bit in Bohai Oilfield was reconstructed based on the modified Young′s drilling rate equation and field real drilling data.The abnormal high pressure zone of an exploration well in Bozhong sag was successfully identified by using this model,and the formation pressure curve can be calculated and simulated to provide the basis for reasonable selection of drilling fluid density in the field,so as to ensure downhole safety and successful completion of geological reservoir exploration tasks.
引文
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[2]王志战,陆黄生.异常高压随钻预测理论与方法[J].录井工程,2011,22(3):37-41.
[3]刘月军,马卫民.采用dcp指数监测PDC钻头钻井[J].钻采工艺,1995,18(1):97-99.
[4]王守君,刘振江,谭忠健,等.勘探监督手册(地质分层)[M].北京:石油工业出版社,2013:133-134.
[5]奇林格G V,谢列布里亚科夫V A,罗伯逊J O,等.异常地层压力成因与预测[M].赵文智,柳广第,苗继军,等译.北京:石油工业出版社,2004:41-51,92-113.
[6]OSBORNE M J,SWARBRICK R E.Diagenesis in North Sea HPHT clastic reservoirs-consequences for porosity and overpressure prediction[J].Marine and Petroleum Geology,1999,16(2):337-353.
[7]谢玉洪,李绪深,童传新,等.莺歌海盆地中央底辟带高温高压天然气富集条件、分布规律和成藏模式[J].中国海上油气,2015,27(4):1-12.
[8]王江涛,李育.沉积盆地异常高压形成机制综述[J].石油化工应用,2014,33(1):5-9,13.
[9]郝芳.超压盆地生烃作用动力学与油气成藏机理[M].北京:科学出版社,2005.
[10]沈章洪.渤海油田古近系超压成因分类及分布特征[J].中国海上油气,2016,28(3):31-36.
[11]张玲.PDC钻头钻速方程的室内实验研究[D].大庆:东北石油大学,2013.
[12]WARREN T M.Drilling model for soft-formation bits[J].Journal of Petroleum Technology,1981,33(6):963-969.
[13]林成名.随钻地层孔隙压力预测方法研究[D].大庆:东北石油大学,2014.