Experimental study on the crucial effect of test system compliance on hydraulic fracturing in-situ stress measurements

被引：0
|
作者：
Qin X. [1 ]
Chen Q. [1 ]
Zhao X. [2 ]
Zhang C. [1 ]
Sun D. [1 ]
Meng W. [1 ]
Feng C. [1 ]
Wang B. [1 ]
Yang Y. [3 ]
机构：
[1] Key Laboratory of Neotectonic Movement and Geohazard, Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing
[2] Beijing Research Institute of Uranium Geology, Beijing
[3] School of Engineering and Technology, China University of Geosciences, Beijing
来源：
Yanshilixue Yu Gongcheng Xuebao/Chinese Journal of Rock Mechanics and Engineering | 2020年 / 39卷 / 06期
基金：
中国国家自然科学基金;
关键词：
Field test; Hydraulic fracturing method; Hydraulic fracturing parameter; In-situ stress; Rock mechanics; Shut-in test; System compliance;
D O I：
10.13722/j.cnki.jrme.2019.1204
中图分类号：
学科分类号：
摘要：
In order to study the effect of test system compliance on the determination of hydraulic fracturing parameters and principal stresses in detail, hydraulic fracturing field tests were performed by using a recently improved single-cycle hydraulic fracturing equipment which can monitor the pressure of wellhead, test interval and packers during the entire test process. The results show that the values of the HF parameters Ps, Pr, Pb and SH derived from the wellhead pressure data are generally larger than those determined from the test interval pressure data due to the effect of the test sytem compliance.The absolute difference of Ps, Pr, Pb and SH between the wellhead and test interval results are 0-0.375, 0-0.75, 0.125-0.875 and -0.25-0.875 MPa, respectively, and the relative differences mainly range within 0-5%, 0-6%, 0-4% and 0-5%, respectively. The absolute difference value of Pb is considered to be controlled not only by the test system compliance but also by the mechanical properties of the strata and in situ stress state. The affecting mechanism of test system compliance on the Pr absolute difference magnitude is relatively complex, and test interval flow rate data should be supplemented. In addition, a new method referred as shut-in test was proposed to obtain the shut-in pressure more accurately during HF tests. The results relating to shut-in tests indicate that the method can effectively eliminate the influence of the test system compliance and the pipeline frictional resistance. It is suggested that, when only the wellhead pressure data is used, Ps, Pr, Pband SH should be revised according to a maximum proportion of 5%, 6%, 4% and 5%. © 2020, Science Press. All right reserved.
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页码：1189 / 1202
页数：13
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