Underground coal mine water hole prevention and control high-water-pressure water jacking directional drilling tool and drilling method

A high water pressure, directional drilling technology, applied in the field of drilling, can solve the problems of poor water control effect, large amount of auxiliary engineering, shortening, etc., to improve the effective utilization of hydraulic energy, reduce "reactive" load, and improve mechanical drilling speed effect

Active Publication Date: 2020-05-15
XIAN RES INST OF CHINA COAL TECH& ENG GROUP CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For directional drilling for underground exploration and drainage of coal mines for water prevention and control, under the condition of high-pressure water gushing in the formation, directional drilling with top water is difficult, and the depth of the hole often fails to meet the design requirements, and the effect of water prevention is poor. High cost and long cycle
For underground grouting reinforcement and transformation of coal mines for water prevention and control directional drilling, under the condition of high-pressure water gushing in the formation, directional drilling with top water is difficult, so the length of a single grouting hole sec

Method used

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  • Underground coal mine water hole prevention and control high-water-pressure water jacking directional drilling tool and drilling method
  • Underground coal mine water hole prevention and control high-water-pressure water jacking directional drilling tool and drilling method
  • Underground coal mine water hole prevention and control high-water-pressure water jacking directional drilling tool and drilling method

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Experimental program
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Effect test

Embodiment 1

[0047] like figure 2 As shown, the present embodiment discloses a directional drilling tool for preventing and controlling water holes in coal mines with high water pressure and jacking water. The central flow channel 6 communicates with the bottom flow hole 4-1 of the directional drill bit. An inner annular flow channel 7 is arranged around the outside of the drill string body 5, and one end of the inner annular flow channel 7 close to the directional drill bit 4 communicates with the central flow channel 6 through the first bypass flow channel 8 provided on the drill string body 5; The other end of the inner annular channel 7 communicates with the outside of the drilling tool through a second bypass channel 9 arranged on the inner annular channel.

[0048] In this embodiment, the drill string body 5 includes a double-channel water feeder 1 having a central channel 6 and an inner annular channel 7 , a double-wall drill pipe 2 and a double-wall single-curved screw motor 3 co...

Embodiment 2

[0061] This embodiment discloses a directional drilling method for preventing and controlling water holes in coal mines with high water pressure and top water directional drilling. The method specifically includes the following steps:

[0062] Step 1, hole drilling: According to the sealing pressure requirements and casing structure design, determine the drilling diameter and depth corresponding to the multi-layer casing, and use the conventional rotary drilling technology to construct the casing step by step from shallow to deep, from small to large For the pipe hole section, as in this embodiment, construct a φ120mm guide hole first, and then expand the hole, the second-level casing is reamed to φ193mm or more, and the third-level casing is reamed to φ220mm or more;

[0063] Step 2, lower the pipe and fix the hole: lower the casing step by step. In this embodiment, the inner diameter of the innermost casing is ≥Φ135mm; then grouting, waiting for coagulation, and pressure test...

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Abstract

The invention discloses an underground coal mine water hole prevention and control high-water-pressure water jacking directional drilling tool and drilling method. The directional drilling tool comprises a drill string body and a directional drill bit which are connected in sequence, and an inner annular hollow flow channel is arranged around the external of the drill string body; a ''Y-type'' structure flush fluid circulation flow channel consisting of a central flow channel and the inner annular hollow flow channel and an outer annular hollow flow channel formed between the drilling tool anda bore wall, the flush liquid is always flowing in the ''low back pressure'' state, the ''reactive'' load of a mud pump is substantially reduced, the effective utilization rate of the hydraulic energy can be improved by 15% or above, and it is ensured that the normal working and output torque parameters of the hole bottom power drilling tool do not change significantly under the working conditionof large water inrush of the high water pressure formation towards the inside of a hole. The drilling tool can normally directionally drill in the formation water outlet pressure condition of 6.0MPaor above, so that the downhole directional drilling water pressure resistance is improved by 50% or above, and the water jacking directional drilling hole-forming depth is 500m or above.

Description

technical field [0001] The invention relates to the technical field of drilling, in particular to a directional drilling tool and a drilling method for preventing and controlling water holes with high water pressure and jacking water in underground coal mines. Background technique [0002] Coal mine water damage has long been one of the most serious disasters restricting the safe and efficient mining of coal resources in my country. According to incomplete statistics, 30% to 40% of my country's raw coal reserves are threatened by water hazards, including water hazards in coal seam roof aquifers, coal seam floor water hazards in pressurized water-filled aquifers, karst subsidence column water damage, outburst water damage in fault fracture zones, old voids, etc. Permeable water damage, surface water body permeable water damage, etc. Among them, water hazards in the confined water-filled aquifers of the floor have a high frequency of occurrence in coal mines in my country, and...

Claims

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Application Information

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IPC IPC(8): E21B7/04E21F16/00E21B33/13E21B4/02E21B47/12
CPCE21B4/02E21B7/04E21B33/13E21B47/12E21F16/00
Inventor 刘建林李泉新赵建国王四一方俊刘桂芹陈盼李渊
Owner XIAN RES INST OF CHINA COAL TECH& ENG GROUP CORP
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