摘要
为了确保莺歌海盆地高温高压地层安全钻井,需准确地进行地层破裂压力评价。以莺歌海盆地乐东区块为研究对象,分析该区块地层破裂原因,基于弹性力学理论构建了地层破裂压力计算模型,综合利用室内实验测试、现场地漏实验、现场孔隙压力测试及测井数据解释等方法,获得了该区块高温高压地层的抗拉强度、泊松比、孔隙压力和地应力等地层破裂压力计算模型所需的关键参数。在此基础上,结合现场钻井液漏失及地层破裂等情况分析,最终通过地层破裂压力计算模型获得了地层破裂压力分布剖面,可为研究区域钻井液性能及井身结构的合理设计提供参考。该地层破裂压力评价方法对于有效解决钻井液漏失问题、保证现场安全高效钻井具有积极的意义。
Accurate evaluation of fracture pressure is one of the key basic problems to ensure safe drilling in high temperature and high pressure formation in Yinggehai Basin.Taking Ledong block in Yinggehai Basin as the research object,the cause of formation fracture in this area is analyzed,and the calculation model of formation fracture pressure is constructed based on the elasticity theory.The critical parameters required for the calculation model of formation fracture pressure such as tensile strength,poisson′s ratio,pore pressure and in-situ stress of high temperature and high pressure formation in the target block are analyzed and evaluated by means of laboratory test,field leakage test,pore pressure test and logging data interpretation.On this basis,combined with the analysis of the actual situation of drilling fluid leakage and fracture,the formation fracture pressure distribution profile is obtained through the calculation model of formation fracture pressure,which can provide reference for the study on the performance of regional drilling fluid and the reasonable design of well structure.The evaluation method of formation fracture pressure can effectively solve the problem of drilling fluid leakage.It is of great significance to ensure safe and efficient drilling on site.
作者
陈现军
廖高龙
张鑫磊
CHEN Xianjun;LIAO Gaolong;ZHANG Xinlei(Zhanjiang Branch,China France Bohai Geoservices Co.,,Ltd.,Zhanjiang,Guangdong 524057,China;CNOOC China Limited Hainan Company,Haikou,Hainan 570312,China;Engineering and Technology Department of PetroChina Tarim Oilfield Company,Korla,Xinjiang 841000,China)
出处
《录井工程》
2023年第2期117-122,共6页
Mud Logging Engineering
基金
中国海洋石油有限公司“十四五”重大科技项目“海上深层/超深层油气勘探技术”(编号:KJGG2022-0405)。
关键词
地层破裂压力
评价
高温高压
莺歌海盆地
抗拉强度
泊松比
孔隙压力
地应力
formation fracture pressure
evaluation
high temperature and high pressure
Yinggehai Basin
tensile strength
poisson′s ratio
pore pressure
in-situ stress
