Three-dimensional multilayered multi-well fracturing prop crack real-time monitoring experimental system and method

Abstract

The invention discloses a three-dimensional multilayered multi-well fracturing prop crack real-time monitoring experimental system and method. The experimental system comprises a core test specimen, acore clamping device, a fully-three-dimensional multilayered stress loading device, a fracturing pumping-in device, a crack expansion real-time monitoring device and a control device. The invention provides the three-dimensional multilayered multi-well fracturing prop crack real-time monitoring experimental system and method, under the conditions that three-directional stress is applied, and twohorizontal directions are layered stresses, the core specimen which includes a plurality of shafts simulates hydraulic fracturing and sand supporting, by crack initiation on fracturing cracks and real-time and quantitative monitoring and later interpretation on crack induction stress of an expansion process, crack initiation of three-dimensional multilayered multi-well fracturing prop cracks and quantified description of the expansion process are realized, and the laying state of a propping agent in the cracks can be obtained.

Description

technical field [0001] The invention relates to the technical field of oil and gas reservoir fracturing reconstruction, and more specifically relates to a three-dimensional multi-layer multi-well fracturing support fracture real-time monitoring experimental system and method. Background technique [0002] Hydraulic fracturing technology has become the core technology in the development of low-permeability tight reservoirs and an important technology for coalbed methane exploitation. Hydraulic fracturing is used to open rocks to communicate with natural fractures, and support the fractures with proppant to generate high-permeability paths to achieve the purpose of increasing production. How to maximize the volume of reservoir stimulation is a technical problem that restricts the efficient development of low-permeability tight reservoirs. However, the key lies in how to determine the law of fracture initiation and propagation under original in-situ stress conditions and the pr...

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Problems solved by technology

[0004] The above experiments have the following deficiencies: 1. Most of the true triaxial fracturing devices used at present, the three-dimensional stress loading method, does not involve multiple layers; 2. The fracture monitoring method uses acoustic emission, which can only semi-qualitatively evaluate the fracture formation p...

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