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Closed type helical hole-protecting drill and using method thereof for drilling of soft coal bed

A soft coal seam, closed technology, used in drill bits, drill pipes, drill pipes, etc., can solve the problems of high drilling resistance and low slag discharge efficiency.

Active Publication Date: 2015-01-28
HENAN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to solve the deficiencies in the prior art, the invention adopts the structure innovation of the spiral blade to make it have the function of protecting the hole, and the drill cuttings move in the protected space, avoiding the influence of drilling deformation and hole collapse, and overcomes the conventional For the problems of high drilling resistance and low slag removal efficiency of casing drilling tools, a closed spiral hole protection drilling tool for drilling soft coal seams with good hole protection effect and improving the drilling effect of soft coal seam and its use are provided method

Method used

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  • Closed type helical hole-protecting drill and using method thereof for drilling of soft coal bed
  • Closed type helical hole-protecting drill and using method thereof for drilling of soft coal bed
  • Closed type helical hole-protecting drill and using method thereof for drilling of soft coal bed

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Effect test

Embodiment 1

[0029] Embodiment one: if Figure 1 to Figure 8 As shown, the present invention is used for drilling into soft coal seam closed type helical hole protection drilling tool and using method thereof, comprises closed type helical hole protection drill rod 4, helical slag guide bit 5, and helical slag guide bit 5 is installed on the closed helical helical The front end of hole protection drilling rod 4. The closed spiral hole protection drill rod 4 is composed of a closed spiral hole protection blade 9 and a multi-edge drill rod body 10 . The closed spiral hole-protecting blade 9 is composed of a spiral blade top 901 and a spiral petiole 902. The width of the spiral blade top 901 is greater than that of the spiral petiole 902. The structures of the spiral blade top 901 and the spiral petiole 902 are designed in two ways: no holes or holes. The spiral blade tops 901 are connected to form a closed hole protection space, and a slag discharge space is formed between the spiral petiol...

Embodiment 2

[0037] Embodiment two: if Figure 9 , Figure 10 As shown, the difference from Embodiment 1 is that the connection mode of the drill pipe joint is changed. The plug-in male joint 1105 is designed as a hexagonal structure, and the plug-in female joint 1104 is set to correspond to the plug-in male joint 1105. Internal hexagonal structure, plug-in connection, can realize the reverse of the drill pipe.

Embodiment 3

[0038] Embodiment three: as Figure 11 , Figure 12 As shown, the difference from Embodiment 1 is that a round hole structure 15 is provided on the spiral petiole 902, and a slag discharge channel is formed between the spiral petiole 902 of the closed spiral hole guard blade 9. Using this structure, the drill pipe and the rubber hose 1 at one end It is connected with the air supply pipe of the roadway, and the other end is connected with the air supply device 2 at the tail of the drill to implement ventilation auxiliary slag discharge and improve the efficiency of slag discharge.

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Abstract

The invention discloses a closed type helical hole-protecting drill and a using method thereof for drilling of a soft coal bed. The closed type helical hole-protecting drill comprises a closed type helical hole-protecting drill pipe and a helical slag-guiding drill bit, and the helical slag-guiding drill bit is mounted at the front end of the closed type helical hole-protecting drill pipe. The closed type helical hole-protecting drill is mainly applied to the drilling engineering of the soft and breaking coal rock layer. The using method includes mounting and connecting a drill, the closed type helical hole-protecting drill pipe, the helical slag-guiding drill bit and an orifice slag discharging device, starting the drill, breaking and drilling the coal bed by the helical slag-guiding drill bit, guiding drillings into the helical slag discharging space of the closed type helical hole-protecting drill pipe along slag-guiding helical grooves of the drill bit, and discharging the drillings out of the hole through friction of helical blades. The closed type helical hole-protecting drill is novel in design, and is provided with a hole protecting function via structural innovation of the helical blades, the drillings are discharged within in the protected space and prevented from being influenced by deformation and collapse of drilled holes, and the defect that a conventional casing drill is high in drilling resistance, low in slag discharging efficiency and the like is overcome.

Description

technical field [0001] The invention belongs to the technical field of drilling engineering for soft and broken coal seams in underground coal mines, and in particular relates to a closed-type spiral hole protection drilling tool for drilling soft coal seams and a method for using the same. Background technique [0002] Drilling construction is a key technology for underground gas drainage. For soft, broken and difficult-to-drill low-permeability coal seams coupled with combined stress, affected by factors such as ground stress, gas pressure, structural stress and drill pipe disturbance, the deformation of the borehole is large. Boreholes are prone to instability and damage, and the boreholes are prone to blockage. The frictional resistance formed in the blocked section of the borehole will affect the rotation and movement of the drill pipe, and eventually the drilling construction cannot be carried out. To solve the problem of drilling in soft and broken coal rock formation...

Claims

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Application Information

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IPC IPC(8): E21B17/22E21B10/44
CPCE21B10/44E21B17/22
Inventor 王永龙孙玉宁王振锋宋维宾韦纯福
Owner HENAN POLYTECHNIC UNIV
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