集成的三维地应力与单井地质力学计算及应用  

Integration of 1D Geomechanics and 3D In-Situ Stress Numerical Computation:Methodology and Application

作　　者：沈新普 向冬梅 武兴勇 SHEN Xinpu;XIANG Dongmei;WU Xingyong(School of Petroleum Engineering,China University of Petroleum(East China),Qingdao 266580,Shandong,China;Research In-stitute of Engineering Technology,PetroChina Xinjiang Oilfield Company,Karamay 834000,Xinjiang,China)

机构地区：[1]中国石油大学(华东)石油工程学院,山东青岛266580 [2]中国石油新疆油田分公司工程技术研究院(监理公司),新疆克拉玛依834000

出　　处：《新疆石油天然气》2023年第2期40-48,共9页Xinjiang Oil & Gas

基　　金：中国石油天然气集团公司重大专项“准噶尔南缘和玛湖等重点地区优快钻完井技术与试验”(2019F-33);国家自然科学基金项目“非常规天然气开采中关键力学问题理论与试验研究”(11272216)。

摘　　要：在准噶尔盆地南缘新区块安全钻井有两个主要困难:第一是缺乏测井数据从而无法用常规方法计算孔隙压力;第二是背斜构造局部应力变化复杂,单井地应力分析难以给出准确地应力值。为了克服这两个困难,提出使用三维地应力数值解的孔隙压力及钻井液密度窗口预测方法,并成功地将其应用于准噶尔盆地南缘吐谷鲁背斜区块高压气井LT1井的钻井工程之中。在区块三维地应力场的计算模型中引入了基于地震波层位信息的详细构造,得到了区块的精细地应力场三维数值解。进一步计算得到了孔隙压力及钻井液密度窗口预测值。根据三维地应力场数值计算结果,结合层速度数据,预测了LT1井全井深8 000 m范围的地层孔隙压力,计算了相应的安全钻井液密度窗口,为安全快优完成LT1井的钻井施工提供了理论指导和准确的参考数据。LT1井成功完钻的实践表明,提出的方法是有效的,给出的孔隙压力及钻井液密度窗口的预测结果是准确的。There are two major difficulties in safe drilling of a new block in the southern margin of Junggar Basin:the first is the lack of logging data,which makes it impossible to calculate pore pressure values using a conventional method;the second is that the anticline structure has complex stress variations locally and it is hard to give accurate stress values through a single-well in-situ stress analysis.In order to overcome the two difficulties,this paper puts forward a method for pore pressure and drilling fluid weight window predictions based on 3D in-situ stress numerical solutions.It has been successfully applied in the drilling operation of LT1,a high-pressure gas well in Tugulu anticlinal block in the south margin of Junggar Basin.The structural details derived from the seismic formation data were introduced into the calculation model of the 3D in-situ stress field of the block to obtain the accurate numerical solution of its 3D in-si-tu stress.The predicted formation pore pressure values and drilling fluid weight windows were calculated accordingly.The predicted formation pore pressure data covering LT1's total depth of 8,000 m were given according to the numerical results of the 3D in-situ stress field with the velocity data of intervals,and the corresponding drilling fluid weight windows for safe drilling were calculated,thus providing theoretical guidance and accurate reference data for performing the drilling operation of this well safely,quickly,and excel-lently.The successful drilling operation of LT1 shows that the method proposed here is effective and the predicted pore pressure and drilling fluid weight window data are accurate.

关 键 词：孔隙压力 地应力场 层速度 高压气井 钻井液密度窗口 准噶尔盆地南缘 三压力曲线 

分 类 号：TE242[石油与天然气工程—油气井工程]