川东黑楼门构造地层三压力剖面的建立及应用  

Establishment and Application of Three-Formation-Pressure Profile of Heiloumen Structure in the East of Sichuan

作　　者：龚铭[1] 夏宏泉[1] 陈颖杰[2] 

机构地区：[1]西南石油大学油气藏地质及开发工程国家重点实验室 [2]中国石油西南油气田公司勘探事业部

出　　处：《国外测井技术》2015年第1期34-37,57,共5页World Well Logging Technology

基　　金：国家重点基础研究发展计划(973计划)课题"页岩气水平井钻完井关键技术研究"(编号:2013CB228003)

摘　　要：川东黑楼门构造地处川东盆缘大巴山前缘构造复合带,其地质情况比较复杂,多段地层异常高压,钻井中井壁垮塌和井漏频发。本文结合工区地质构造特征和实钻资料,利用常规、地层倾角和偶极声波等测井资料,针对不同岩性地层的压实机理建立地层孔隙压力计算模型,依据摩尔-库仑破坏准则和最大拉应力理论分别建立地层坍塌压力和破裂压力的计算模型,并通过编程处理典型井的测井资料建立了地层三压力剖面。根据工区地层三压力的变化规律,确定了合理的安全钻井液密度窗口。工区地层三压力计算结果与实测值相比,其误差在10%以内,满足工程应用精度要求,所计算的三压力剖面对防止井壁垮塌与井漏有重要指导作用。Heiloumen structure is located in the composite belt of Dabashan mountain front of eastern Sichuan basin edge. It has characteristics of complex geological condition, abnormal high pressure in carbonate rock layers, and serious wall collapse and lost circulation during drilling. Considering the geological structure features and actual drilling data of the work area, the compaction mechanism of different lithologies is used to establish the pore pressure calculation model based on conventional logging, diplog and dipole acoustic loggingdata. The formation collapse pressure and fracture pressure calculation model are established according to Mohr-Coulomb damage criterion and the maximum tensile stress theory, and the three-formation-pressure profile is set up through processing typical well logging data. The reasonable safety drilling fluid density window is determined depending on the pressure variation law in the area. The difference between the results of three-formation-pressure calculation and the measured values is less than 10%, which meets the accuracy requirements of engineering applications. The three-formation-pressure model plays an important role in preventing borehole collapse and lost circulation.

关 键 词：测井解释 岩石力学 地层三压力 安全钻井液密度 井壁稳定 

分 类 号：TE21[石油与天然气工程—油气井工程]