Device for testing influence of multiphase flow on tensile strength of rock

Abstract

The invention discloses a device for testing the influence of a multiphase flow on the tensile strength of a rock. A pressing joint is communicated with an axial pressure loading pump, a cylinder cover is respectively connected with the pressing joint and a cylinder body, the cylinder body is connected with a bell jar, an upper pressing plate is provided with an internal pressure unloading switching joint which is respectively communicated with the cavity of a hollow cylinder sample and an internal pressure unloading screw hole, the upper pressing plate is provided with a pore hydraulic pressure loading switching joint which is respectively communicated with a clay plate and a pore hydraulic pressure loading screw hole in an annular cushion block embedded with the clay plate, a base is appressed with an annular perforated plate, the bell jar is connected with the base, the base is connected with a disc trolley, the hollow cylinder sample is connected with a lead screw rod, the lead screw rod is connected with a data acquisition instrument, a pore air pressure loading screw hole is respectively connected with a gas guiding hole and a gas-phase loading pump, and the base is connected with the disc trolley by virtue of a fixed screw rod. The device provided by the invention is reasonable in structure and is easy to operate, can realize the migration process of the multiphase flow in the rock under a certain condition and can be applicable to a model test used for testing the influence of the multiphase flow on the tensile strength of the rock.

Description

Test device for the effect of multiphase flow on the tensile strength of rock technical field The invention relates to the field of rock mechanics, in particular to a model test device for testing the influence of multiphase flow on the tensile strength of rock, which is suitable for the model test of the influence of multiphase flow on the tensile strength of rock. Background technique The multiphase flow in the rock can change the relative permeability of the rock and further change the mechanical properties of the rock. Therefore, the multiphase flow has become an important factor that must be considered in the problems of energy extraction, storage and waste storage. The exploitation of shale gas adopts hydraulic fracturing to stimulate shale gas production, the influence of multiphase flow of salt water layer on the tensile strength of caprock during the geological storage of carbon dioxide, and the selection of underground natural gas storage. On the one hand, the so...

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Problems solved by technology

At present, hydraulic fracturing devices widely used in China can only measure the tensile strength of rocks. In addition to the shortcomings of not being able to evaluate the influence of multiphase flow on the tensile strength of rocks, they cannot also measure the breakthrough pressure of liquids in rocks.

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