Borehole fissure permeability sectional pressure-regulating type observation method

Abstract

The invention belongs to the technical field of rock mass mining-induced fissure permeability measurement, and discloses a borehole fissure permeability sectional pressure-regulating type observationmethod. A used device comprises a plugging test system, a propulsion system and a supply control system. The plugging test system comprises occluders, a communication tube and converters; water injection cavities are formed by occluders and a borehole; the converters are located at tails of a front occluder and a middle occluder; an inner ring, a spring, a cross silk sleeve, a water collecting tank and a water dividing hole are arranged inside each converter; a water through hole arranged in each inner ring communicates with the water colleting tank, and conveys an externally connected water source to the water injection cavities through each water dividing hole to detect the permeability of a borehole fissure. By adopting the device, a same water source can be utilized to realize the working of sealing and an observation process under respective pressures, the number of pipes in the borehole is reduced to one, the problem of the drill pipe winding is solved, the stability of the observation process is improved, and the observation water pressure can be adjusted according to needs; at the same time, a multi-stage measurement process can be achieved at a time, thereby improving theobservation efficiency.

Description

technical field [0001] The invention belongs to the technical field of rock mass fissure permeability measurement, and in particular relates to a segmented pressure-regulating observation method for borehole fissure permeability. 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 advan...

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, etc., and the detection distance of each advancing is short

Prior art fails to solve the above problems simultaneously

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