Rough crack flow guide capability test experiment device and test evaluation method

Abstract

The invention relates to a rough crack flow guide capability test experiment device and a test evaluation method, wherein a test rock sample is put in a flow guide cavity of the rough crack flow guide capability test experiment device; artificial cracks with the fractal features and a certain surface roughness degree are cut in the test rock sample; a loading top plate is arranged on the upper part of the flow guide cavity; a seam width measuring device and a displacement sensor are arranged at the lower part of the flow guide cavity; a platform with a roller set is arranged on the base; the flow guide cavity is fixed on the base; the loading top plate is pressurized; the base is used for supporting; the loading on the upper covering pressure of the test rock sample can be jointly completed; a liquid feeding loading block and a liquid discharging loading block are arranged at the two sides of the flow guide cavity; a closing pressure loading block and a closing pressure regulating device are arranged at the front end and the back end of the flow guide cavity; the flow guide cavity is provided with a direction change loading block; the closing pressure loading block, the closing pressure regulating device and the direction change loading block are matched for completing the loading of the crack closing pressure. The device and the method provided by the invention realize the quantitative evaluation and analysis of the crack wall surface roughness on the flow guide capability.

Description

Technical field [0001] The invention relates to an indoor test device and an evaluation method for the conductivity of rough wall cracks formed by hydraulic fracturing during the process of increasing production of oil and gas reservoirs, and specifically relates to an experimental device and a test evaluation method for testing the conductivity of rough fractures. Background technique [0002] At present, the conventional testing method of conductivity is to simulate the conductivity of fracturing fluid in a single plate fracture under the conditions of a certain closure pressure, temperature, and sanding concentration under indoor experimental conditions. The Darcy formula is used to calculate the conductivity of a certain closure Under pressure, the influence of fracture width, proppant parameters, and fracturing fluid type on conductivity, complete the evaluation of fracture conductivity. [0003] However, after the oil and gas reservoirs are reformed by hydraulic fracturing, t...

AI Technical Summary

Problems solved by technology

At present, the conductivity test conducted by the conventional conductivity test device ignores the influence of crack roughness on the experimental results, which greatly reduces the test accuracy and limits the application and analysis range of the data.

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