南海西部某井区安全钻井液密度窗口的确定  

Determination of the safe drilling fluid density window in X well area in the western South China Sea

作　　者：李华洋 吴惠梅[1] 严科 刘琬玉 郭金陇 LI Huayang;WU Huimei;YAN Ke;LIU Wanyu;GUO Jinlong(College of Petroleum Engineering,Yangtze University,Wuhan Hubei 430100,China;College of Chemical Engineering,Fuzhou University,Fuzhou Fujian 350116,China)

机构地区：[1]长江大学石油工程学院,湖北武汉430100 [2]福州大学石油化工学院,福建福州350116

出　　处：《石油化工应用》2020年第4期8-11,共4页Petrochemical Industry Application

基　　金：国家自然科学基金项目,项目编号:51774050;2018年湖北省大学生创新创业训练计划,项目编号:2018319;中国科学院大学生创新实践训练计划,项目编号:20194000120。

摘　　要：莺歌海盆地深水区地质条件复杂,为典型的高温高压区域,压力预测极为困难,溢流、卡钻甚至上漏下喷等问题时有发生。为解决上述问题,结合L-1井区的实钻情况和独特的地质条件,建立了一套基于地震层速度资料的地层压力预测模型。采取伊顿法计算有测井资料的深部井段的孔隙压力,对于缺少测井资料的浅部地层,则采取基于地震层速度的孔隙压力预测方法。采用邓金根法预测破裂压力,对于坍塌压力则在确定地应力后将其代入库伦摩尔准则可得。确定了L-1井区地层压力剖面从而预测出安全钻井液密度窗口,为合理设计井身结构,精准确定不同井段深度处的钻井液密度值提供科学指导。The geological conditions in the deep water area of the Yinggehai basin are complex. It is a typical area of high temperature and high pressure. It is extremely difficult to predict the pressure, and problems such as overflow, stuck drilling and even leaking and spraying occur frequently.In order to solve the above problems, a set of formation pressure prediction models based on seismic layer velocity data was established based on the actual drilling conditions and unique geological conditions in the L-1 well area. The Eaton method is used to calculate the pore pressure in deep wells with logging data. For shallow formations lacking logging data, a pore pressure prediction method based on seismic layer velocity is used. The Deng Jingen method is used to predict the rupture pressure, and the collapse pressure can be obtained by determining the in-situ stress and bringing it into the Coulomb Moore criterion. The formation pressure profile of the L-1 well area was determined to predict the safe drilling fluid density window, which provided scientific guidance for rationally designing the wellbore structure and accurately determining the drilling fluid density values at different well depths.

关 键 词：深水钻井 孔隙压力 破裂压力 坍塌压力 密度窗口 

分 类 号：TE254[石油与天然气工程—油气井工程]