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A directional drilling tool and drilling method for preventing and controlling water holes under high water pressure jacking water in coal mines

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: 2021-07-02
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 section can only be shortened, and the drilling and grouting are frequently carried out, which requires a large amount of auxiliary engineering , grouting and waiting for solidification and other additional operations take a long time, the comprehensive drilling efficiency is low, and deep hole drilling is difficult
However, when the formation water inrush pressure reaches 6 MPa or more, the existing directional drilling technology and equipment can no longer be used for top water construction, which limits the further application of underground near-horizontal directional holes in the field of mine water disaster prevention and control to a certain extent.

Method used

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  • A directional drilling tool and drilling method for preventing and controlling water holes under high water pressure jacking water in coal mines
  • A directional drilling tool and drilling method for preventing and controlling water holes under high water pressure jacking water in coal mines
  • A directional drilling tool and drilling method for preventing and controlling water holes under high water pressure jacking water in coal mines

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Experimental program
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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 provided 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 a directional drilling tool and a drilling method for preventing and controlling water holes in coal mines with high water pressure and jacking water, wherein the directional drilling tool includes a drill string body and a directional drill bit connected in sequence, and an inner annular air flow is arranged around the outside of the drill string body Channel; the "Y-shaped" structure flushing fluid circulation channel composed of the central channel, the inner annular channel and the outer annular channel formed between the drilling tool and the hole wall, and the flushing fluid is always in the "low back pressure" state Down flow greatly reduces the "reactive" load of the mud pump, and its effective utilization rate of hydraulic energy can be increased by more than 15%, ensuring that the power drilling tool at the bottom of the hole can work normally under the condition of a large amount of water gushing into the hole from the high water pressure formation . The output torque parameter has no obvious change. The drilling tool can normally drill directionally under the condition of formation water pressure above 6.0MPa, which improves the water pressure resistance of downhole directional drilling by more than 50%, and the hole depth of top water directional drilling is more than 500m.

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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Patent Type & Authority Patents(China)
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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