Modeling of fiber-optic strain responses to hydraulic fracturing
| Autor: | Joe Stefani, Ivan Lim Chen Ning, James P. DiSiena, Yunhui Tan, Kelly Hughes, Zhishuai Zhang, Zijun Fang, Dimitri Bevc |
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| Rok vydání: | 2020 |
| Předmět: |
Optical fiber
Materials science Strain (chemistry) 02 engineering and technology Strain rate Distributed acoustic sensing 010502 geochemistry & geophysics 01 natural sciences law.invention 020303 mechanical engineering & transports Geophysics Hydraulic fracturing 0203 mechanical engineering Geomechanics Geochemistry and Petrology law Fiber optic sensor Composite material 0105 earth and related environmental sciences |
| Zdroj: | GEOPHYSICS. 85:A45-A50 |
| ISSN: | 1942-2156 0016-8033 |
| Popis: | We modeled cross-well strain/strain rate responses of fiber optic sensing, including distributed strain sensing (DSS) and low-frequency distributed acoustic sensing (DAS), to hydraulic stimulation. DSS and low-frequency DAS have been used to measure strain or the strain rate to characterize hydraulic fractures. However, the current application of DSS/DAS is limited to acquisition, processing, and qualitative interpretations. The lack of geomechanical models hinders the development of the technology toward quantitative interpretation and inversion. We have developed a strategy to use the displacement discontinuity method to model the strain field around kinematically propagating fractures. For a horizontal monitoring well, modeling results were able to explain the heart-shaped extending pattern before a fracture hit, the polarity flip due to fracture interaction during stimulation, and the V-shaped pattern when a fracture does not intersect with the monitoring well. For a vertical monitoring well, modeling shows the different characters of strain rate responses when a fracture is near and far away from a vertical monitoring well. We also investigated the effects of fractures with various geometries such as elliptic and layered fractures. We compared and verified the modeling with field data from the Hydraulic Fracturing Test Site 2, a research experiment performed in the Permian Basin. Our modeling work can be used to identify patterns in field observations. The results also help to improve acquisition design and lay the groundwork for quantitative interpretation and inversion. |
| Databáze: | OpenAIRE |
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