Fracture network shear-two-phase flow test device and test method

Abstract

The invention relates to a fracture network shear-two-phase flow test device and test method. The device comprises a model boundary isobaric water and gas injection device, a model boundary water andgas collection device, a glass fracture network model, a wide cover plate, a narrow cover plate and a water and gas collection tank, wherein the model boundary isobaric water and gas injection deviceand the model boundary water and gas collection device are mounted on the two sides, facing the external environment, of the glass fracture network model respectively; thewide cover plate and thenarrow cover plate are clamped above and below the glass fracture network model; the model boundary water and gas collection device is externally connected with a water and gas collection tank, a coordinate system is established with the length direction of the glass fracture network model as the x axis and the width direction as the y axis, the glass fracture network model can move in the X-axis direction and the Y-axis direction, and the displacement in the X-axis direction needs to be larger than 0.By means of the device and method, two-phase flow tests under different opening degrees and different shear displacement conditions can be achieved, and the shear-two-phase flow mechanism of the fracture network is disclosed.

Description

technical field [0001] The invention belongs to the technical fields of fluid mechanics and rock mechanics, and in particular relates to a fracture network shear-two-phase flow test device and a test method. Background technique [0002] In rock mass engineering, the rock mass will be sheared and dislocated under the disturbance of factors such as earthquakes and excavations, which will cause the fracture network inside the rock mass to undergo relative displacement along the shear cracks. This will provide more complex channels for the migration of water or other harmful substances, further increasing the permeability of the rock mass and deteriorating the physical and mechanical properties of the rock mass. In addition, the development of oil and gas resources, the exploitation of coalbed methane, the sequestration of carbon dioxide and the development of geothermal resources and other underground projects also involve the problem of two-phase flow in fracture networks. T...

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Problems solved by technology

[0004] The invention patent with the application number 201710432090.5 discloses "an experimental device and method for two-phase flow in a fracture network". During the specific operation of the device and method, the following problems were found: when the sample undergoes shear failure, the shear cracks and The fractures inside the fracture network are all deformed, resulting in changes in the opening and permeability coefficie

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