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Underground coal mine directional drilling and reaming integrated drilling tool and directional drilling and reaming-while-drilling method

A directional drilling and casing technology, applied in drilling equipment and methods, directional drilling, drill bits, etc., can solve the problems of low efficiency of secondary large-diameter reaming, small primary hole diameter, and difficulty in forming holes in broken formations. Achieve the effect of avoiding tripping and rotary reaming operations, broadening the applicable formation range, and improving the efficiency of drilling and breaking rock

Active Publication Date: 2021-07-13
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

[0008] Aiming at the defects and deficiencies in the prior art, the present invention provides an integrated drilling tool for directional drilling and reaming in coal mines and a directional drilling and reaming method for directional drilling while drilling, so as to solve the problem of the diameter of one-time hole formation of directional drilling for gas drainage in coal mines. Problems such as small size, low reaming efficiency of secondary large-diameter holes, and difficulty in forming holes in complex and fractured formations

Method used

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  • Underground coal mine directional drilling and reaming integrated drilling tool and directional drilling and reaming-while-drilling method
  • Underground coal mine directional drilling and reaming integrated drilling tool and directional drilling and reaming-while-drilling method
  • Underground coal mine directional drilling and reaming integrated drilling tool and directional drilling and reaming-while-drilling method

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Embodiment 1

[0055] This embodiment provides a drilling state switching device, such as Figure 2 to Figure 7 As shown, it includes a transmission shaft 31, a bearing group A and a bearing group B that are sleeved on the outer wall of the transmission shaft 31 and are connected coaxially in sequence, a torsion disc 34 that is installed at the end of the transmission shaft 31 and can rotate with the transmission shaft 31, and a transmission shaft. The twist plate 34 is coaxially fitted with a piston 35 that can move axially, a piston housing 36 that is sleeved outside the piston 35 and can rotate synchronously with the piston 35, and the two ends of the piston housing 36 are respectively connected to the bearing group B and the fins The casing 37 ; the drive shaft 31 , the twist disc 34 , the piston 35 and the fin casing 37 are all connected through the center.

[0056] The piston 35 includes an integral piston end 351, a piston connecting portion 352, a tapered piston tip 353, a piston cen...

Embodiment 2

[0068] This embodiment provides an integrated drilling tool for directional drilling and expansion in coal mines, such as figure 1 As shown, it includes the drilling state switching device 3 in Embodiment 1, and also includes a sliding directional drilling tool and a rotary reaming drill, and the sliding directional drilling tool, the drilling state switching device 3 and the rotary reaming drill are connected in sequence.

[0069] The sliding directional drilling tool includes a sequentially connected measurement-while-drilling probe tube 4 , a single-curved screw motor 5 and a directional drill bit 6 , and the measurement-while-drilling probe tube 4 is connected to a fin housing 37 .

[0070] The rotary reaming drilling tool includes a special-shaped drill rod 1 and a reaming drill bit 2. The outer wall of the special-shaped drill rod 1 is provided with a hyperboloid spiral groove. Connect the installation end of the transmission shaft, and the reaming drill bit 2 is set out...

Embodiment 3

[0075] This embodiment provides a method for directional drilling while drilling in underground coal mines, such as Figure 8 As shown, the method includes the following steps:

[0076] Step 1: Connect drilling tools: After completing the construction of the orifice casing section, install the directional drill bit, single-curved screw motor, measurement-while-drilling probe, drilling state switching device, reaming bit and special-shaped drill pipe in sequence, and use the drilling machine to connect The directional drilling and expansion integrated drilling tool is lowered to a distance of 0.5m from the bottom of the hole;

[0077]Step 2: Adjust the direction of directional drilling: keep the orifice mud pump in the closed state, the piston contacts and engages with the torsion disc under the action of spring A, and the wings are retracted under the push of spring B; use the measurement while drilling probe to measure the drilling Hole trajectory space parameters and the to...

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Abstract

The invention discloses an underground coal mine directional drilling and reaming integrated drilling tool and a directional drilling and reaming-while-drilling method, the directional drilling and reaming integrated drilling tool comprises a sliding directional drilling tool, a drilling state switching device and a rotary reaming drilling tool, and during directional drilling and reaming-while-drilling, the drilling state switching device adjusts the working state of the sliding directional drilling tool and the deflecting drilling direction. The sliding directional drilling tool conducts directional deflecting drilling under the action of feeding power provided by the drilling machine and rotation power provided by the single-bend screw motor, and a directional pilot hole is formed. The rotary reaming drilling tool performs reaming along the directional pilot hole under the action of feeding power and rotation power provided by the drilling machine, and large-diameter reaming while drilling is achieved. According to the method, the problems of small primary hole forming diameter, low secondary large-diameter reaming efficiency and difficulty in hole forming of complex broken stratums of current underground coal mine directional drilling are solved, large-diameter primary hole forming is realized, the range of stratums applicable to directional drilling is widened, the gas extraction effect is improved, and safe and efficient mining of a working face is ensured.

Description

technical field [0001] The invention belongs to the field of coal mine underground tunnel drilling, and relates to an underground coal mine directional drilling and expansion integrated drilling tool and a method for directional drilling while drilling. Background technique [0002] Coal production in high gas and coal and gas outburst mines accounts for about one-third of the national coal production, and gas disasters seriously restrict the safe and sustainable development of the coal industry. Underground directional holes in coal mines can realize advanced, regional, and precise gas drainage. It is an important technical means for gas disaster control and has great significance for improving mine safety. Since the measurement-while-drilling and directional drilling technology was introduced into my country's coal mine underground drilling engineering field at the beginning of this century, my country has independently developed the measurement-while-drilling kilometer di...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B7/06E21B7/28E21B21/00E21B10/26
CPCE21B7/06E21B7/061E21B7/064E21B7/068E21B7/28E21B21/00E21B10/26
Inventor 贾明群方俊李乔乔吴智峰范云林黄寒静芦甜
Owner XIAN RES INST OF CHINA COAL TECH& ENG GROUP CORP
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