Device and method for testing specific surface of rock sample in isothermal adsorption instrument

Abstract

The invention discloses a device for testing specific surface and pore distribution of rock in an isothermal adsorption instrument, and belongs to the field of oil-gas exploration and development. On the basis of the isothermal adsorption instrument, a device accommodating a test sample is improved to meet the requirement of conventional and unconventional oil-gas exploration and development; the improved device can directly test a rock core pillar of which the diameter Phi is 25 mm and a rock core fragment of which the diameter Phi is not larger than 25 mm, so as to reduce the impact of pores distributed in the surface of the sample on the test result to a larger extent, eliminate perturbance of a smashing process on the pore structure during the testing of a coal seam gas and shale gas reservoir rock sample, and ensure that the test result can restore the practical distribution of rock pores in a stratum relatively really. For sample selection, the rock core pillar, which is tested with gas saturation and treated with rock electroanalysis, is selected for the specific surface and pore distribution test; then the rock core pillar is treated with a rock mechanical property test, so that the test result is relatively visual, and the processes of oil-gas exploration and development are accelerated.

Description

technical field [0001] The invention relates to a device and a preparation method for testing the specific surface of a rock sample in an isothermal adsorption instrument, belonging to the field of oil and gas exploration and development and laboratory testing. Background technique [0002] With the rapid development of the national economy, the dependence on energy is getting higher and higher, and the possibility of discovering large-medium-sized conventional oil and gas fields on land is getting smaller and smaller. The direction of conventional oil and gas reservoirs has shifted. As the first echelon of unconventional oil and gas resource exploration, tight sandstone reservoirs and shale gas and coalbed methane in the second echelon have also become the new focus of petroleum geologists and oil development experts. In the process of exploration and development of oil and gas resources, restricted by many factors such as geological understanding theory level, testing tech...

AI Technical Summary

Problems solved by technology

When the existing isothermal adsorption instrument tests the rock specific surface and analyzes the pore size distribution, the rock sample must first be crushed into powder. The error has a great influence; on the other hand, the mechanical power during the crushing process will change the pore structure of rocks with high plasticity such as coal and shale, and the pore size distribution results of the experimental analysis will also be distorted; in addition, after the test, the original The powder in the test device will be discarded, which causes a waste of precious core materials. At the same time, re-sampling is required to test other petrophysical properties, which will not be conducive to the comparison of petrophysical properties of the same sample.

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