Device for measuring pore pressure conduction rate of medium-high coal rank coal core matrix

Abstract

The invention provides a device for measuring the pore pressure conduction rate of a medium-high coal rank coal core matrix. The device comprises a helium gas cylinder, a methane gas cylinder, an annular pressure container and a high-pressure experiment bin, the helium gas cylinder and the methane gas cylinder are connected with one end of a volume reference cylinder, an analysis tank or a pistoncontainer, the other ends of the volume reference cylinder, the analysis tank and the piston container are connected with a booster pump, one end of the annular pressure container is connected with the helium cylinder, the methane cylinder and the input end of the high-pressure experiment bin, the other end of the annular pressure container is connected with the output end of the high-pressure experiment bin, the helium cylinder and the methane cylinder are connected with the input port of the high-pressure experiment bin, the output port of the high-pressure experiment bin is connected with the input port of a volume correction container, and the output port of the volume correction container is connected with the volume reference cylinder, the analysis tank and the piston container; andthe high-pressure experiment bin comprises sealing end covers at the two ends and a high-pressure experiment bin chamber arranged between the sealing end covers, a sleeve is arranged in the high-pressure experiment bin chamber, and a rock core is arranged in the sleeve. The conduction rate measuring device provided by the invention provides a theoretical basis for formulating a medium-high coal-rank coal bed gas scheme.

Description

technical field [0001] The invention relates to the technical field of conduction rate measuring devices, in particular to a medium-high rank coal core matrix pore pressure conduction rate measuring device. Background technique [0002] Coalbed methane development is an important support development direction of the national clean and safe energy strategy. China's coalbed methane is dominated by medium and high-rank coalbed methane, which is different from the mining characteristics of coalbed methane production areas with low coal rank as the main feature in the United States, and there are also obvious differences in research methods and experimental techniques. , in addition to being significantly affected by the three external factors of drilling and completion technology, well type control technology, and drainage technology, it also depends on whether high-efficiency production blocks can be selected from numerous coalbed methane gas-bearing areas in order to meet the ...

AI Technical Summary

Problems solved by technology

China's coalbed methane is dominated by medium and high-rank coalbed methane, which is different from the mining characteristics of coalbed methane production areas with low coal rank as the main feature in the United States, and there are also obvious differences in research methods and experimental techniques. , in addition to being significantly affected by the three external factors of drilling and completion technology, well type control technology, and drainage technology, it also depends on whether high-efficiency production blocks can be selected from numerous coalbed methane gas-bearing areas in order to meet the economic requirements. The principle of high-efficiency production construction, the production capacity of high-efficiency production blocks not only depends on many reserve parameters of coalbed methane, but also depends on whether coalbed methane can be absorbed from the matrix pore surface (more than 75% of coalbed methane reserves). Efficient desorption, diffusion and migration to cleats and fractures extending in all directions, and then rapid enrichment to the high-permeability zone of the wellbore, forming a large-scale gas production with high efficiency, and the coalbed methane reservoir has the same gas content per ton of coal or the same block reserves Under such circumstances, its output rate and scale enrichment efficiency vary widely. Often there are cases where no gas is produced or the output is not up to standard, and the investment is in vain. This poses a huge challenge to the efficient and economical production of coalbed methane. Under such circumstances, it is of great significance to rationally select high-efficiency enrichment and production construction blocks

[0003] The core matrix pore pressure conduction rate experimental device is used to compare the pressure conduction rate of coalbed methane in the core matrix pores of different coal ranks or block coal reservoirs under a certain pressure, and provide the necessary technical basis for the optimization of parameters for efficient enrichment of coalbed methane. There is no experimental device for testing the pore pressure conduction rate of the core matrix in the prior art

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