Adsorption and desorption/exploitation simulated experimental device and method of shale gas

Abstract

The invention relates to an adsorption and desorption / exploitation simulated experimental device and method of shale gas. The device comprises a reference cylinder, a sample cylinder, a constant-temperature box, a piston type middle container, a valve, a high-precision plunger pump, a data acquisition system, a valve, a pressure sensor and a pressure sensor. A constant-pressure exploitation method comprises the following steps: carrying out experiment pre-treatment; setting the high-precision plunger pump into a constant pressure mode, setting pump pressure as an experimental pressure value, and acquiring data of the high-precision plunger pump in real time during withdrawal of the pump; recording the pressure P' when a pressure value of the sample cylinder reaches the experimental pressure value set in the pump and both of the pressure values are balanced; carrying out a plurality of pressure point balancing tests. A constant-yield exploitation method comprises the following steps: carrying out experiment pre-treatment; setting the high-precision plunger pump into a constant current mode, setting gas-production experiment flow velocity in the pump, and acquiring the pressure P' of the sample cylinder and the data of the pump in real time; stopping the operation of the pump when the pressure of the sample cylinder is reduced to an experimental setting value; carrying out a plurality of gas-production flow velocity simulated tests. According to the device and the method, the reliability of the result of the exploitation simulated test is ensured.

Description

technical field [0001] The invention relates to the field of natural gas exploitation, more specifically, to a shale gas reservoir adsorption / desorption / exploitation simulation experiment device and method thereof. Background technique [0002] At present, the exploration and development of shale gas in my country is in its infancy. Laboratory experiments are mostly based on petrological analysis, geochemical analysis, and gas-bearing analysis. Development physical simulation research focuses on the determination of physical parameters, pore structure characteristics, adsorption experiments, and seepage. However, there are few studies on the simulated development mechanism of shale gas reservoirs and the simulation of production dynamics under different working systems. Patent document CN103994960A discloses a coal / shale isothermal adsorption experiment method, and proposes a new measurement method for isothermal adsorption experiments, which can effectively reduce the number...

AI Technical Summary

Problems solved by technology

[0003] Patent document CN102944666A discloses a shale gas reservoir mining simulation experiment device, although the experimental device can be used to conduct adsorption / desorption experiments on large-scale shale cores, and to study the gas adsorption / desorption of large-scale shale cores under different conditions In addition, adsorption, desorption and mining simulation experiments can be carried out at the same time, but the measurement accuracy of the gas production measurement method is low under high temperature and high pressure, and the control and measurement of production pressure and flow rate under high temperature and high pressure in the mining simulation experiment are the key to the mining technology , at the same time, the technical solution of this patent document cannot realize the mining simulation experiment under the fixed production mode

[0004] There are also some patent documents disclosed in the mining simulation experiment that the back pressure control is realized through the backflow valve. After a long time of use, the control accuracy is reduced, and the accurate measurement of the gas production under high temperature and high pressure cannot be realized, and the reliability of the mining simulation test results cannot be guaranteed. sex

In addition, the existing equipment used in mining simulation experiments cannot carry out mining simulation experiments under the two working systems of constant pressure and fixed production

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