A multi-dimensional experimental device and its application method for coalbed methane drainage research

Abstract

The invention discloses a multi-dimensional experimental device for research on coalbed methane drainage and its application method, which includes a confining pressure simulation unit, a coal seam simulation unit, a simulated well unit and a metering unit; the confining pressure simulation unit includes a box with an open top The body and cover are combined on the upper cover at the top of the box; holes are opened on the upper cover, double-layer rubber rings are provided on the inner surface of the surrounding walls and the bottom wall of the box, and double-layer rubber rings are provided on the side wall of the box. The injection hole connected to the double-layer rubber ring, the external water injection device injects water into the double-layer rubber ring through the injection hole to simulate the confining pressure; the coal seam simulation unit is placed in the confining pressure simulation unit, which includes several hollow hexahedrons and hollow connecting rods, each There are small holes on the six sides of the hollow hexahedron, and the hollow hexahedrons are connected by hollow connecting rods to simulate the spatial structure of the coal seam; the simulated well unit includes a hollow capillary, which passes through the hole of the upper cover and extends into the box to simulate the wellbore ; The upper end of the hollow capillary is connected with the metering unit.

Description

technical field [0001] The invention relates to a multi-dimensional experimental device used for the research of coal bed gas drainage and its application method, which belongs to the field of coal bed gas development. Background technique [0002] The exploration and development of coalbed methane is of great significance for increasing the effective supply of natural gas, improving the safe development and comprehensive utilization of coal and natural gas resources, and developing a green economy. [0003] At present, the evaluation of the physical properties (permeability) of coalbed methane reservoirs and the mechanism research of pulverized coal migration in my country are mainly carried out in three ways, namely, production experiments, reservoir numerical simulations, and one-dimensional core displacement experiments. The production test method is a test method that can best reflect the real state of the underground. However, since the production test well is one-time...

AI Technical Summary

Problems solved by technology

However, there are certain problems for coalbed methane reservoirs, and the cost of this method is high

Mainly due to the soft coal seam, the coal seam is easily broken during the coring process, and it is difficult to obtain a relatively standard coal core; at the same time, limited by the size of the coal sample and the rock mechanical properties of the coal rock, there are often no major seepage channels for coalbed methane in the experimental samples --Cleats, resulting in the inconsistency between the seepage law in the indoor experiment and the reality

Images