摘要
岩石地应力的大小与方向在钻井工程、压裂工程等方面具有重要的参考价值。实验室测试岩心地应力是获取井下原岩现今地应力特征的有效方法之一。但定向取心成本高、工序繁多,因此,现场多为非定向岩心。在文献调研的基础上,分别介绍了古地磁法、声波各向异性法和差应变法,及它们确定地应力方向和大小的原理,建立了非定向全直径岩心实验室测试地应力大小及方向的一体化方法。现场实际井下岩心测试应用表明,该一体化方法的测试结果与成像测井结果具有一致性。
In-situ stresses are important in well drilling and hydraulic fracturing.The formation stress measured in laboratory is one of the ways to obtain the In-situ stresses.Unoriented coring is common in practice due to high cost of oriented coring.In this paper,we give an introduction to several different methods for stress determination,including paleomagnetic orientation determination,wave velocity anisotropy and differential strain analysis.An integrated method for determination of in-situ stress from unoriented core in laboratory was developed.The filed application shows that the result from this method agrees with imaging logging.
出处
《石油钻探技术》
CAS
北大核心
2010年第4期108-111,共4页
Petroleum Drilling Techniques
基金
中国石化西南油气分公司重点科研项目"河坝构造工程地质研究"(GJ-106-0818)资助
关键词
岩心
地应力
古地磁
声波
差应变
实验室试验
core
crustal stress
testing
paleomagnetism
sound wave
differential strain analysis method
laboratory testing
