Horizontal drilling and segmented pressure maintaining grouting device and method for water-bearing layer of coal seam floor

Abstract

The invention relates to a horizontal drilling and segmented pressure maintaining grouting device and method for a water-bearing layer of a coal seam floor. The device comprises a perforating gun and an oil passing pipe packer, wherein the perforating gun is used for being connected with a coiled oil pipe, and is provided with a plurality of spraying holes; and the oil passing pipe packer is connected with the perforating gun through a releasing tool and is used for setting a located casing pipe when receiving pressure. The device and method provided by the invention have the advantages that segmented reliable grouting is achieved; repeated hole sweeping work during grouting of a next grouting point in the advancing type grouting process is reduced; the construction efficiency is improved; the construction cost is reduced; by using the split grouting mode, the wellhead pressure is enabled to be effectively transferred to a grout leakage point; a prefabricated pressure maintaining device is used for segmented pressure maintaining; the grouting construction can be performed on the next grouting point while pressure maintaining is performed on the previous grouting point; the waiting time for solidification of grout in a hole is reduced; and the total construction period of a grouting project is effectively shortened.

Description

technical field [0001] The invention relates to a segmental pressure-maintaining grouting device and method for horizontal drilling, which belongs to the technical field of mine water prevention and control, and in particular to a segmental pressure-maintaining grouting device and method for horizontal drilling of coal seam floor aquifers. Background technique [0002] Coal seam mining in North China type coalfields often faces the threat of water hazards in high-pressure karst fractured aquifers on the floor. Concealed faults, collapse columns and other water-conducting channels can easily lead aquifer water into the mining space, causing water inrush and flooding of wells. It is one of the important means of aquifer flood control. [0003] At present, the main aquifer grouting reconstruction methods include conventional drilling and grouting in underground roadway construction, and directional drilling and grouting in ground or underground construction. The directional dri...

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Problems solved by technology

[0007] The present invention mainly solves the technical problems in the prior art that pressure consumption is caused by full-hole grouting in the grouting reformation of the limestone aquifer on the coal seam floor by using directional long holes, and the efficiency is low due to repeated operations of drilling down and sweeping holes for many times. A segmented pressure-maintaining grouting device and method for horizontal drilling of aquifers in the coal seam floor is proposed. effect, improve construction efficiency

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