Petroleum Science >2024,??Issue2:??- DOI: https://doi.org/10.1016/j.petsci.2023.10.006
A continuous and long-term in-situ stress measuring method based on fiber optic. Part I: Theory of inverse differential strain analysis Open?Access
文章信息
作者：Kun-Peng Zhang, Mian Chen, Chang-Jun Zhao, Su Wang, Yong-Dong Fan
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引用方式：Kun-Peng Zhang, Mian Chen, Chang-Jun Zhao, Su Wang, Yong-Dong Fan, A continuous and long-term in-situ stress measuring method based on fiber optic. Part I: Theory of inverse differential strain analysis, Petroleum Science, Volume 21, Issue 2, 2024, Pages 1171-1189, https://doi.org/10.1016/j.petsci.2023.10.006.
文章摘要
Abstract: A method for in-situ stress measurement via fiber optics was proposed. The method utilizes the relationship between rock mass elastic parameters and in-situ stress. The approach offers the advantage of long-term stress measurements with high spatial resolution and frequency, significantly enhancing the ability to measure in-situ stress. The sensing casing, spirally wrapped with fiber optic, is cemented into the formation to establish a formation sensing nerve. Injecting fluid into the casing generates strain disturbance, establishing the relationship between rock mass properties and treatment pressure. Moreover, an optimization algorithm is established to invert the elastic parameters of formation via fiber optic strains. In the first part of this paper series, we established the theoretical basis for the inverse differential strain analysis method for in-situ stress measurement, which was subsequently verified using an analytical model. This paper is the fundamental basis for the inverse differential strain analysis method.
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Keywords: In-situ stress; Fiber optic; Orthotropic elastic; Differential evolution; ABAQUS