Device and method for segmental positioning and cut-off with pressure in downhole drilling

Abstract

The invention relates to the technical field of mining engineering, in particular to a device and method for positioning and shutting off sections under pressure in an underground borehole. Connected with a lower card slot, a coupling block is inserted into the lower slot, and a chute is arranged on the coupling block, a pressing block is slidably connected to the chute, and a spring is fixedly connected to the pressing block, and the sliding The groove is connected with a through groove, and a hook is fixedly installed on the pressing block, the coupling block is inserted into the upper slot of the plug shell, and the upper slot is connected with the upper card slot, and the stopper is fixedly installed on the plug shell. Blocking the waterway at fixed points by means of segmented grouting can avoid the enlargement of the waterway caused by too much grout pressure, and lower the stopper into the borehole, and use the rotating tube to drive the screw to stop the plug from the stopper. The internal pressure makes the cut-off plug expand and stick to the wall of the borehole, sealing the borehole and preventing the slurry from leaking out.

Description

technical field [0001] The invention relates to the technical field of mining engineering, in particular to a device and method for segmental positioning and cut-off with pressure in an underground borehole. Background technique [0002] When the borehole is not excavated, the coal and rock mass is in a state of load balance. The excavation of the borehole destroys the state of the coal mass, and the coal and rock mass directly subjected to the force on the wall of the borehole exceeds the ultimate stress and breaks. The borehole is very easy to contact with the upper aquifer and The water-bearing structure is hydraulically connected and becomes the water-conducting channel of the mine. The threat of water damage is one of the major threats affecting the safe mining of coal mines. [0003] Currently, the technology used for drilling plugging mainly focuses on fully-sealed drilling, but this technology still has many deficiencies: 1) lack of research on the diffusion and mig...

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Problems solved by technology

[0003] Currently, the technology used for drilling plugging mainly focuses on fully-sealed drilling, but this technology still has many shortcomings: 1) lack of research on the diffusion and migration of grout in proto-rock or artificial proto-rock fissures; 2) lack of For the effective control of water environment pressure in aquifers, the existing hydrostatic pressure is generally low, and the hydrostatic pressure is usually obtained through constant head devices, which is generally much lower than the grouting pressure; Degree, fracture inclination, fracture roughness, grout specific gravity, water pressure environment and other main control variables affect the grout migration, so when the plugging method of fully enclosed drilling is adopted, the plugging effect is poor, because the grout pressure is too high, On the contrary, it is easy to cause the expansion of the water channel. In view of this, we propose a device and method for positioning and shutting off the pressure in the downhole borehole

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