A 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 includes a model boundary isobaric water injection and gas injection device, a model boundary water and gas collection device, a glass fracture network model, a wide cover plate, and a narrow cover Plate and water vapor collection tank, the two sides of the glass fracture network model facing the external environment are respectively equipped with model boundary isobaric water and gas injection devices and model boundary water vapor collection devices; wide cover plates are installed above and below the glass fracture network model And the narrow cover plate, the water vapor collection device at the model boundary is connected to the water vapor collection tank, and the length direction of the glass fracture network model is the x axis, and the width direction is the y axis to establish a coordinate system, and the glass fracture network model can be along the X axis and the Y axis Direction movement, wherein the displacement in the X-axis direction needs to be greater than 0; the device and method of the present invention can realize two-phase flow tests under different openings and different shear displacement conditions, revealing the mechanism of shear-two-phase flow in the fracture network .

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 coefficients. This device and method cannot simulate the situation of different openings and different shear displacements

[0005] The existing two-phase flow test devices and methods are unable to simulate the fracture network-shear two-phase flow related experiments, and cannot reveal the shear-two-phase flow mechanism of the fracture network, which seriously affects the construction safety of related geotechnical engineering. Hidden danger

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