Rock high-pressure permeability testing method and device based on rock displacement and hole-pressure

Abstract

The invention relates to a rock high-pressure permeability testing method and device based on rock displacement and hole-pressure. The method comprises the following steps: high-pressure water is injected in a rock through a pressurized water test hole, a plurality of osmotic pressure holes are distributed on one side of the pressurized water test hole, a plurality of deformation observation holes are arranged on the other side symmetrically to the osmosis pressure holes, the inside of each osmosis pressure hole is provided with a osmometer, the inside of each deformation observation hole is provided with a multipoint displacement meter, the downhole elevations of the osmosis pressure holes, the pressurized water test hole and the deformation observation holes are ensured to be the equal, the osmosis pressure holes, the pressurized water test hole and the deformation observation holes are parallel mutually; the flow and pressure of the pressurized water test hole, the osmosis pressure of the osmosis pressure holes and the displacement of the deformation observation holes are recorded simultaneously, the time interval for recording is not more than 5 minutes; and finally, the high-pressure permeability coefficient of the rock is solved by combining the relation of the flow and pressure of the pressurized water test hole to the time, applying the fluid structure Interaction theory and adopting the osmosis pressure-displacement bivariate back analysis method, according to the relation curve of the osmosis pressure and displacement of the rock to the time under the action of high-pressure water.

Description

technical field [0001] The invention relates to a method and device for in-situ high-pressure water pressure testing of rock mass in the fields of water conservancy and hydropower engineering, water supply engineering, petroleum engineering, etc., especially a method and device for rock mass high-pressure permeability testing based on rock mass displacement and pore pressure. Background technique [0002] Under the existing technical conditions, the rock mass high-pressure water pressure test system generally only arranges water pressure test holes or a small number of seepage holes to measure the permeability of rock mass. The disadvantage of this technique is that the deformation process of the rock mass near the water pressure test hole cannot be obtained, and the permeability of the rock mass can only be deduced from the flow pressure relationship curve of the water pressure test hole, and the test results have great limitations. Contents of the invention [0003] The ...

AI Technical Summary

Problems solved by technology

The disadvantage of the technology is that it cannot obtain the deformation process of the rock mass near the water pressure test hole, and the permeability of the rock mass can only be calculated according to the flow pressure relationship curve of the water pressure test hole, and the test results have great limitations.

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