论文部分内容阅读
虽然存在各种地应力测试方法,但并没有一个比较完善的方法测量较大深度条件下主应力的大小和方向。所以,在以科学研究为目的的钻井工程中,最好能够结合钻孔法和岩芯法得到三维地应力的大小和方向。叙述一个新颖而且有效的岩芯地应力测试法——非弹性应变恢复量测定法的基本原理、实验技术和基本操作程序;并给出其在科学钻探工程中的一个具体应用实例。测试结果表明,非弹性应变恢复量测定法对于测试三维地应力的主方向和估测主应力的大小有较大的实用价值。特别是在某些较大深度钻井的条件下,如在应力释放法及水压致裂法都无法实施,或者需要一些其他测试方法来补充一些不足或来增添其测试结果的可信度的时候,此方法的应用价值更高。
Although a variety of in-situ stress testing methods exist, there is not a well-established method for measuring the magnitude and direction of principal stresses at greater depths. Therefore, in the scientific research for the purpose of drilling engineering, it is best to be able to combine drilling and core method to obtain the size and direction of three-dimensional stress. A new and effective method of in-situ stress testing for rock core-the basic principle, experimental technique and basic operation procedure of non-elastic strain recovery measurement is described. A concrete example of its application in scientific drilling engineering is given. The test results show that the method of inelastic strain recovery has great practical value for testing the main direction of three-dimensional geostress and estimating the principal stress. Especially in some deep drilling conditions, such as stress relief method and hydraulic fracturing method can not be implemented, or need some other test methods to supplement some deficiencies or to increase the credibility of its test results , This method is more valuable.