Distributed optical fiber strain monitoring method based on crack propagation simulation

Abstract

The embodiment of the invention relates to a distributed optical fiber strain monitoring method based on crack propagation simulation. The distributed optical fiber strain monitoring method comprisesthe following steps of S10, obtaining parameter information, and building a physical model of crack propagation and optical fiber strain monitoring, wherein the parameter information comprises wellbore and fracturing completion information, oil reservoir geological parameters, optical fiber positions and fracturing construction parameter information; S20, establishing a planar three-dimensional hydraulic fracturing crack propagation calculation model coupled with wellbore flow; S30, establishing an optical fiber strain and strain rate calculation model in the fracturing process; S40, smoothingdiscrete data, and drawing a cloud chart of optical fiber strain and fracturing well injection time and a cloud chart of optical fiber strain rate and fracturing well injection time; and S50, establishing a typical plate of optical fiber strain and strain rate signals and a model for judging that cracks collide with an optical fiber monitoring well, and fitting stratum parameters according to actual signals.

Description

technical field [0001] The embodiments of the present invention relate to the technical field of oil and gas field development, in particular to a distributed optical fiber strain monitoring method based on fracture propagation simulation. Background technique [0002] Horizontal well staged multi-cluster fracturing is the key technology for the development of unconventional oil and gas reservoirs at present. This technology generally uses the "clustered perforation" technology to realize a section of multi-fracture expansion, with high operating efficiency and low construction cost. It is the current low oil price background. The main well completion technology. In order to rationally optimize the construction design, the fracture propagation form is generally evaluated by microseismic monitoring during the fracturing process, but the generation mechanism of the microseismic signal does not completely correspond to the fracture rupture. [0003] Distributed optical fiber l...

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Problems solved by technology

However, at present, the theoretical research of this technology is insufficient, and the corresponding relationship between formation strain and fracture propagation during the fracturing process is not clear, and there is no effective means to analyze the relationship between the optical fiber strain signal and the fracture propagation during the fracturing process, and it is difficult for engineers to carry out actual measurement. Interpretation and analysis of data reduces the success rate of construction

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