Chongqing Institute of Geology and Mineral Resources

Chongqing University

Zhaohui Lu

Pei He

Jiren Tang

Yunzhong Jia

Jiankun Zhou

Lei Zhou

Yugang Cheng

Junping Zhou

Yiyu Lu

An experimental system for a pulsed displacement and replacement of methane with carbon dioxide is provided. The experimental system includes a gas supply system, a pulse control system, a reservoir environment simulation system, a data acquisition and processing system and a tail gas recovery system, connected in sequence; and the carbon dioxide output from the gas supply system is converted into a pulsed gas through the pulse control system, the pulsed gas enters the reservoir environment simulation system to shorten a time of displacing and replacing methane with carbon dioxide, the experimental data of the reservoir environment simulation system is recorded in real time, analyzed and processed by the data acquisition and processing system, a dynamic displacement process is reflected in real time, and a relationship between a displacement evaluation indicator and a displacement time is clarified. The disclosure further provides an experimental evaluation method, using the above experimental system.

Experimental system and experimental evaluation method for pulsed displacement and replacement of methane with carbon dioxide

The present disclosure discloses a reciprocating rock fracture friction-seepage characteristic test device and method. The test device includes an X-axis shear system, a Y-axis stress loading system, a Z-axis stress loading system, a servo oil source system, 5 a pore pressure loading system, and a host. The X-axis shear system includes an X-axis EDC controller, an upper shear box, a lower shear box, an X-axis left hydraulic cylinder, an X-axis right hydraulic cylinder, an X-axis left pressure head, an X-axis right pressure head, an X-axis left pressure sensor, an X-axis right pressure sensor, an X-axis displacement sensor, and an X-axis 10 displacement sensor. The pore pressure loading system includes an air cylinder, a pressure gauge, a pressure reducing valve, a fluid inlet pipeline, a fluid outlet pipeline, and a flowmeter.

Reciprocating rock fracture friction-seepage characteristic test device and method

A pulse hydraulic fracturing tool of coiled tubing dragging with bottom packer includes a pulse frequency regulating device and liquid jetting device connected to each other. The pulse frequency regulating device has a rotor, a rotating member, a fixed member and a stator. An eccentric setting is arranged between the stator and the rotor. A part of a first fluid provided by the coiled tubing flows into the jet cavity through the channel in the rotor, and drives the rotor to rotate with another part of the first fluid, such that a first passing region is formed between the rotating member and the fixed member in a predetermined pulse frequency. The another part of the first fluid flows into the jet cavity through the first passing region. The nozzle ejects two parts of the first fluid mixed in the jet cavity out.

Pulse hydraulic fracturing tool and method for coiled tubing dragging with bottom packer

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Chongqing, China

Zhaohui Lu