Method for observing fracture permeability of variable-pressure adjustable rock mass

Abstract

The invention belongs to the technical field of rock mass permeability measurement, and relates to a method for observing fracture permeability of variable-pressure adjustable rock mass. The connection relationship of the device used is as follows: a converter thread is connected to the rear part of a front plugger, and the inner part of the converter thread comprises an inner ring, a spring and across wire sleeve, the compression degree of the spring is changed by adjusting the cross wire sleeve, and the pressure-on of the inner ring is further controlled; after the front plugger and the tail plugger are expanded, a water injection cavity is formed with a drilling hole, and the external high-pressure water enters the water injection cavity through the converter to detect the permeabilityof the drilling hole. The testing device simplifies the external operating system and the operation steps, reduces the pipe in the drilling hole to be one, avoids the problem of the wire winding of the drilling rod, improves the stability of the measuring process, realizes the sealing process and the measuring process under the own respective pressure with the same water source, the variable pressure regulation of the converter is realized, so as to adapt to different working environment and pressure-on demand.

Description

technical field [0001] The invention belongs to the technical field of rock mass permeability measurement, and in particular relates to a pressure-variable adjustable rock mass fissure permeability observation method. Background technique [0002] The permeability coefficient of rock mass is an important parameter reflecting the permeability of fractured rock mass, and the change of rock mass permeability is closely related to the damage of rock mass. Therefore, it is of great significance to study the relationship between rock mass permeability coefficient and fracture size, water injection volume and water injection pressure. At present, the commonly used equipment for the detection of borehole permeability is a double-end plugging leak detection device, which has the advantages of relatively high measurement accuracy and convenient manufacture. , leading to the problem that the pipelines in the corresponding borehole are prone to intertwining during the advancing process...

AI Technical Summary

Problems solved by technology

At present, the commonly used equipment for the detection of borehole permeability is a double-end plugging leak detection device, which has the advantages of relatively high measurement accuracy and convenient manufacture. , leading to the problem that the pipelines in the corresponding borehole are prone to intertwining during the advancing process, resulting in unstable working process, troublesome operation process, poor adaptability and other problems

Images