Novel adsorption and desorption experiment device and novel adsorption and desorption experiment method

Abstract

The invention provides a novel adsorption and desorption experiment device and a novel adsorption and desorption experiment method. The device mainly consists of a reference cylinder, a sample cylinder, a confining pressure pump, a booster pump, an air compressor, an intermediate container, a constant temperature system, a pressure sensor and a computer, wherein the sample cylinder mainly consists of a sample chamber, a confining pressure chamber, a left adjustable plug, a right adjustable plug, a barrel, a sealing ring, a screen mesh and a leather sheath; the confining pressure chamber is defined by the barrel and the leather sheath; the sample chamber is defined by the leather sheath and the adjustable plugs; the sample chamber is connected with the reference cylinder; the reference cylinder, the sample cylinder and the pressure sensor are arranged in the constant temperature system; the confining pressure chamber is connected with the confining pressure pump, and the confining pressure pump is used for increasing the confining pressure of the confining pressure chamber, so that the real stratum conditions can be simulated; the sample cylinder is provided with the two adjustable plugs, one adjustable plug is provided with the screen mesh on the top, and the other adjustable plug is not provided with the screen mesh, so that two rock samples including standard rock samples (having length of 5cm and diameter of 2.5cm) or rock sample powder (with 60-80 meshes) can be arranged in the sample cylinder. The device and the method have the advantages that the principle is reliable, and the device is simple in structure and simple and safe to operate; the real stratum environment can be simulated, and temperature and pressure conditions of different reservoir stratums as well as the methane adsorption and desorption law of the rock samples can be determined, so that reasonable experimental data can be provided for shale gas occurrence form research and reserve calculation.

Description

technical field [0001] The patent of the present invention belongs to the category of unconventional shale gas adsorption and desorption experiments, and specifically relates to the determination of adsorption and analysis laws, aiming at the device and method for determining the adsorption and desorption laws of actual rock samples under the real formation conditions of shale reservoirs. Background technique [0002] As a typical unconventional oil and gas resource, shale gas is widely distributed around the world. Among them, my country's shale gas reserves have reached about 31.5 trillion cubic meters, surpassing the shale gas reserves of the United States, and the exploitation potential is huge. The adsorption analysis law experiment is the basic work for shale gas reserve evaluation and shale gas occurrence state research, and provides necessary physical parameters for shale gas exploitation. [0003] In the field of unconventional shale gas adsorption and desorption re...

AI Technical Summary

Problems solved by technology

[0003] In the field of unconventional shale gas adsorption and desorption research, rock sample powder (60-80 mesh) is usually used as the experimental rock sample. The sample cylinder used in the experiment only has a sample chamber, which cannot simulate the real formation temperature and pressure conditions.

A series of studies were carried out to address this experimental limitation, and it was found that in the conventional adsorption and desorption experiments, no confining pressure was added during the experiment, and the rock sample powder was not affected by confining pressure. Compared with the real formation conditions, the specific surface area of ​​rock sample particles increased. large, which leads to a relatively large adsorption amount and a relatively high resolution amount

Therefore, no confining pressure was added in the experiment, which could not reflect the real formation environmental conditions, resulting in inaccurate experimental data and even drawing wrong conclusions

Images