Test device and test method for simulating multi-scale branch cracks of shale

Abstract

The invention discloses a test device and a test method for simulating multi-scale branch cracks of shale. The test device comprises a plurality of crack simulation plug boards and a crack width adjusting assembly, wherein each crack simulation plug board comprises a front panel and a rear panel which are buckled with each other, branch cracks are formed between the front panel and the rear panel after the front panel and the rear panel are buckled, a hollow prism for communicating two adjacent branch cracks is connected between two adjacent rear panels, and supporting foot stands are fixed at the bottom ends of the front panel and the rear panel; and the crack width adjusting assembly is fixedly connected between the front panel and the rear panel and used for adjusting the width of the branch cracks. According to the test device and the test method, any angle setting among the plurality of branch cracks is realized through the hollow prisms to form the multi-scale branch cracks, so that simulation of the laying rule of a propping agent in the multi-scale branch cracks is realized, the simulation is closer to the actual construction and mining working condition, the obtained test data precision is higher, and theoretical support is provided for increasing the mining amount.

Description

technical field [0001] The invention relates to the technical field of oil and gas field exploitation test devices, in particular to a test device and a test method for simulating multi-scale branched fractures in shale. Background technique [0002] Hydraulic fracturing technology is widely used as a necessary means of developing unconventional oil and gas resources such as shale oil and shale gas. The technical principle is to form oil and gas channels with high conductivity in the reservoir by artificial fractures, thereby improving the permeability of the reservoir and increasing oil and gas production. Natural fractures and beddings are developed in shale reservoirs. When hydraulic fractures expand, they will bifurcate, divert, stop, or pass through weak bedding planes to form natural fractures or weak bedding planes to form a complex fracture network. The effective placement of proppant in the complex fracture network is the key to forming larger propped fracture volu...

AI Technical Summary

Problems solved by technology

However, most of the existing branch fracture test devices for simulating branch fractures adopt a design with fixed angles between multiple branch fractures and fixed widths of branch fractures, which are different from those in actual formations where the angles between adjacent branch fractures are variable and the widths of branch fractures are different. structure, there is a big difference between the test working conditions and the actual working conditions, and the low reference value of the results

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