Crack-substrate coupling flow damage evaluating device and method by simulating formation conditions

Abstract

The invention discloses a crack-substrate coupling flow damage evaluating device and method by simulating formation conditions. The device mainly consists of a kettle body 4, a rock core 1, a crack 6, a simulated well 7, a pressurized capsule 3, a resistance probe 16, a pressure sensor 18, a data collecting system 17 and a work liquid circulation system, wherein the rock core 1 is arranged in the kettle body 4; the pressurized capsule 3 wraps the periphery of the rock core; the kettle body is provided with an axial pressure injecting opening, a peripheral pressure injecting opening and a gas inlet; the crack 6 and the simulated well 7 are arranged in the rock core; nine drilling holes extending into the rock core are distributed in the rock core; the resistance probe 16 is arranged in the drilling holes; the resistance probe 16 is connected with the pressure sensor 18; the resistance probe and the pressure sensor are connected with the data collecting system 17; the simulated well 7 is connected with the work liquid circulation system. The circum-well secondary stress condition and the formation radial flow of a crack-substrate system are simulated for determining the damage degree of the crack-substrate system by the device. The device and the method have the advantages that the principle is reliable; the operation is convenient; scientific and accurate quantitative reservoir damage evaluation can be made.

Description

technical field [0001] The invention relates to the technical field of damage evaluation of low-permeability tight sandstone and shale reservoirs, in particular to a fracture-matrix coupled flow damage evaluation device and method for simulating formation conditions. Background technique [0002] Tight sandstone and shale are characterized by low porosity, low permeability, and high content of clay minerals, with complex pore structures, extremely small channels, and imperfectly developed fractures. Tight sandstone and shale gas reservoirs usually need to use fracturing technology to communicate natural fractures and form artificial fractures to achieve the purpose of increasing or putting into production. However, the fracturing fluid entering the fracture-matrix system will cause damage to the reservoir, and fractures are easily damaged by fluid-solid coupling due to the secondary stress of the wellbore. Therefore, the scientific and reasonable evaluation of reservoir dam...

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Problems solved by technology

[0007]The above-mentioned simulation devices are limited to the damage simulation of the matrix or fractures alone, but to make a scientific and accurate evaluation of the reservoir damage should be the damage evaluation of the fracture-matrix system At present, the existing technology cannot truly simulate the secondary stress of the wellbore and the radial flow of the formation on the fracture-matrix system, so it does not have much reference value for actual engineering applications

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