Test device for simulating rock salt cavern and constructing flow field in laboratory

Abstract

The invention relates to a test device for simulating a rock salt cavern and a constructing flow field in a laboratory and belongs to the technical field of rock salt cavern construction of underground gas storages. The test device comprises a water tank, an image recorder and a simulation rock salt cavern made of a transparent material, wherein a center pipe and an intermediate pipe are arranged in the simulation rock salt cavern; the circulating water outlet of the water tank is sequentially connected with a constant-flow pump, a second valve, a third valve and a fourth valve and then is connected with the circulating water inlet of the water tank, second pipes are respectively bypassed between the second valve and the third valve and at the outlet end of the fourth valve, the second pipes are connected with the intermediate pipe, fifth valves are arranged on the second pipes, and the upper end of the center pipe is bypassed to the first pipe between the third valve and the fourth valve; the image recorder is arranged on one side of the simulation rock salt cavern. Compared with the field actually-designed salt cavern, the test has the advantages of high efficiency and strong reliability, and can realize similarity simulation of the pattern of the flow field in the huge salt cavern at depth of thousands of meters under the ground.

Description

technical field [0001] The invention belongs to the technical field of salt rock underground gas storage cavity construction, and specifically relates to a test device for laboratory simulation of a flow field constructed in a salt rock karst cavity. Background technique [0002] With the rapid development of economy and society, the national energy strategic reserve is becoming increasingly urgent. Due to excellent geological conditions, good sealing, and high safety and stability, underground salt karst caves are recognized as ideal places for oil and gas storage and waste disposal. The downstream supporting gas storage of my country's West-to-East Gas Transmission Project is located in salt rock karst cavities. At present, oil storage in central my country is also chosen to be built in salt karst karst cavities. However, in the process of using the traditional water dissolution method to construct a salt rock cavern, the research on the flow field shape and concentration...

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Problems solved by technology

However, in the process of using the traditional water dissolution method to construct a salt rock cavern, the research on the flow field shape and concentration field distribution inside the cavern, the stress and strain of the cavern string, and the pressure change of the cavern during operation and construction are still insufficient. , it is difficult to grasp the upper and side dissolution state of the salt body on the inner wall of the karst cave, which makes it difficult to control the shape of the salt karst cavern, and it is impossible to accurately grasp the pressure relief time of the cavity before construction, which leads to the failure of the underground salt cavern gas storage. Construction delays, slow construction

Since the salt rock karst cavity is buried deep underground, it is impossible to directly observe it with the existing technical means. Therefore, by simulating the flow field shape of the salt rock karst cavity during the cavity construction period in the laboratory simulation device, the underground salt rock gas storage The design research of the library has certain guiding significance

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