Study on the Calculated Method of Horizontal In-situ Stress Based on the Kaiser Stress Point Predicted by Acoustic Signal

doi:10.11885/j.issn.1674-5086.2020.06.11.01

Abstract

Abstract: The in-situ stress evaluation method by acoustic emission tests needs to carry out acoustic emission tests under the loading condition using four small-size cores drilled from a full-scale stratum rock sample. This method will result in the loss of strata rock samples and the high cost for the in-situ stress evaluation. In the present work, a series rock sores were carried out by acoustic emission tests and acoustic emission tests under the loading condition. According to the concept of the good correlation between acoustic properties and mechanical properties of rock, the relational function between acoustic interval transit time and Kaiser Stress Point of rock sample was obtained using the test results. Next, a new calculated method of horizontal in-situ stress based on the Kaiser stress point predicted by acoustic interval transit times using the relational function was developed based on the calculation model of the in-situ stress evaluation method by acoustic emission tests. Furthermore, using the 360° sonic scan data of the full-scale core, the horizontal in situ stress of a tight oil reservoir was evaluated by the new proposed method, as well as the results were compared with the values of in situ stress evaluated by hydraulic fracturing test data. The results show that the values of the horizontal in situ stress calculated by the proposed method have higher accuracy comparing with the results calculated by the models of Anderson, Eaton and Newberry. Therefore, this new proposed method to evaluate the horizontal in situ stress is not only more accurate comparing with the traditional logging interpretation method, but also have higher economy due to that there is no cost on the tests and rock cores loss.

Key words: rock mechanics, in situ stress evaluation, acoustic emission test, Kaiser stress point, acoustic interval transit time

CLC Number:

TE122

FAN Xiangyu, YAO Bowei, ZHANG Qiangui, XIA Hongquan. Study on the Calculated Method of Horizontal In-situ Stress Based on the Kaiser Stress Point Predicted by Acoustic Signal[J]. Journal of Southwest Petroleum University(Science & Technology Edition), 2022, 44(2): 40-48.

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