地层压力预测技术在渤中A区块钻井中的应用  

Application of formation pressure prediction technology in drilling in Bozhong A block

作　　者：李红 于忠涛 袁洪水 袁则名 和鹏飞 LI Hong;YU Zhongtao;YUAN Hongshui;YUAN Zeming;HE Pengfei(CNOOC EnerTech-Drilling ＆ Production Co.,Tianjin 300452,China)

机构地区：[1]中海油能源发展股份有限公司工程技术分公司,天津300452

出　　处：《石油化工应用》2018年第11期33-36,共4页Petrochemical Industry Application

基　　金：中海油能源发展股份有限公司工程技术公司研究项目"海上钻井随钻地层压力监测技术研究";项目编号:GCJSLZBG-E1619

摘　　要：渤中A区块地层压力复杂,给钻井带来很多风险,地层压力的准确计算,对合理选择钻井液密度,防止井喷、井漏等钻井复杂情况的发生具有重要意义。通过对渤中A区块的地质油藏背景认识及异常压力成因机理分析,认为该区块异常压力成因机理应该是由欠压实作用造成的。以录井参数计算的D_c指数和测井声波时差等资料,对该区块4口井进行地层压力计算。结果表明:东三段至沙河街地层存在高压,需要使用合适的钻井液密度来平衡高压地层,保证钻井作业安全顺利完成;D_c指数法、声波时差计算的地层压力计算渤中A区块异常压力是合适的,最大误差为5%,满足了工程的需要,对现场钻井施工作业具有现实意义。The complicated formation pressure in Bozhong A block brings many risks to drilling, and the accurate calculation of formation pressure is of great significance for the rational selection of drilling fluid density and preventing the complicated conditions such as blowout and well leakage. Through the analysis of the geological reservoir background and the cause mechanism of abnormal pressure in Bozhong A block, it is believed that the formation mechanism of the abnormal pressure in the block should be caused by the undercompaction. The formation pressure of 4 wells in this block is calculated based on Dc index and logging data.The results show that there is a high pressure in Dongsan and Shahejie.It is necessary to use the appropriate drilling fluid density to balance the high pressure formation,so as to ensure the safe and smooth completion of the drilling operation.The Dc index method and the formation pressure calculated by interval transit time are suitable for calculating the abnormal pressure of the Bozhong A block, and the maximum error is 5 %, which meets the needs of the engineering and is of practical significance to the field drilling operation.

关 键 词：地层压力 DC指数 测井 渤中区块 

分 类 号：TE249[石油与天然气工程—油气井工程]