Variable pressure adjustable rock mass fracture permeability testing device

Abstract

The invention belongs to the technical field of measuring of the permeability of a rock mass, and discloses a variable pressure adjustable rock mass fracture permeability testing device. The variablepressure adjustable rock mass fracture permeability testing device comprises plugging devices, a converter, a communicating pipe, a drilling machine, a drill pipe and a control operation platform. Theconverter is in threaded connection to the tail part of the front plugging device and internally comprises an inner ring, a spring and a cross-shaped screw sleeve, the compression degree of the spring is changed by regulating the cross-shaped screw sleeve, and the starting pressure of the inner ring is further controlled; the front plugging device and the tail plugging device form a water injection cavity with a drilling hole after being expanded, and the external high pressure water enters the water injection cavity through the converter to detect the fracture permeability of the drilling hole. The testing device simplifies the external operation system and the operation step, the number of pipelines in the drilling hole is reduced to one, the problem of wire winding of the drill pipe isavoided, the stability of the measurement process is improved, the plugging process and the measuring process respectively work at the respective pressures by using a same water source, and the variable pressure of the converter is adjusted to adapt to different working environments and the starting pressure requirements.

Description

technical field [0001] The invention belongs to the technical field of rock mass permeability measurement, in particular to a variable pressure adjustable rock mass fissure permeability testing device. 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, resulting in u...

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