Device and method for preparing water-containing coal sample and testing adsorption

Abstract

The invention discloses a device and a method for preparing a water-containing coal sample and testing adsorption. The device mainly consists of a sample room, a reference room, a control valve, a pressure transmitter, an air injection pump, a data collection card, a collection terminal, a filter and a thermostatic water bath. According to the device and the method for preparing the water-containing coal sample and testing the adsorption, the preparation of the water-containing coal sample can be realized by stimulating a coal bed ground water pressure-bearing environment, and the air adsorbing capacity testing can be carried out, wherein the method comprises the following steps of: carrying out vacuumizing on a system, injecting ground water sample by vacuum suction of the system, ensuring that the coal sample is submerged in the ground water, injecting helium into the system by the air injection pump, and enabling a pore water pressure of the coal sample to reach a ground water pressure; converging superfluous water of the coal sample to the bottom of the sample room under the effect of gravity, and discharging the superfluous water under the effect of an air pressure to finish the preparation of the coal sample; and after carrying out vacuumizing on the system, injecting adsorbed air into the reference room by the air injection pump, controlling classification and injecting the air into the sample room through the valve, after the adsorption is balanced, counting the adsorbing capacity. According to the device and the method for preparing the water-containing coal sample and the testing adsorption, the structure is simple, the operation is convenient, and the application prospect is wide.

Description

technical field [0001] The invention relates to a water-containing coal sample preparation and adsorption measurement device and method, which belong to the technical field of porous medium physical and chemical adsorption testing, and are especially suitable for sample preparation and gas adsorption test of liquid water-containing coal samples under simulated geological conditions of large buried depths. Background technique [0002] In the process of coalbed methane development, the adsorption capacity of coal to gas is one of the bases for reserve evaluation and reasonable mining of coalbed methane. The research shows that the gas in coal is mainly in the adsorption state, and affected by the reservoir environment, various gases are in the competitive adsorption state. Realistically simulating the reservoir environment and comprehensively considering the influence of various complex factors are the keys to evaluating the coal-to-gas adsorption test. In reality, in buried...

AI Technical Summary

Problems solved by technology

[0003] At present, the preparation of water-containing coal is mostly prepared by water vapor adsorption or immersion in liquid water. The water-containing coal sample prepared in this way is quite different from the form of water in the actual coal seam reservoir, and the experimental results will also deviate from the Actually, it cannot reflect the influence of liquid water on gas adsorption in real coal seams

At present, most of the adsorption instruments used in the test are only used for the measurement of adsorption capacity, and do not have the function of simulating the characteristics of the reservoir to prepare coal samples containing liquid water, which has caused great trouble to the experiment.

Images