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Underground-coal-mine nearly horizontal ultra-deep hole directional drilling drill string power push system and method

A power propulsion system and directional drilling technology, applied in directional drilling, drill pipe, drill pipe, etc., can solve the problems of increased construction risk, inability to effectively transmit the propulsion force of the hole drilling rig to the drill bit, and increased friction, etc., to achieve Improve efficiency and drilling depth, improve propulsion efficiency, and reduce feed force

Active Publication Date: 2018-11-23
XIAN RES INST OF CHINA COAL TECH& ENG GROUP CORP
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Problems solved by technology

[0005] The purpose of the present invention is to provide a drill string power propulsion system and method for near-horizontal ultra-deep hole directional drilling underground in coal mines, which realizes the efficient application of drilling pressure and the safety, stability, and Efficient propulsion, solving the problem that the propulsion force of the hole drilling machine cannot be effectively transmitted to the drill bit caused by the contact friction caused by the bending deformation of the drill string in the long-distance near-horizontal directional hole, and solving the problem caused by cuttings during sliding drilling in the near-horizontal hole The problem of increased friction and increased construction risk caused by deposition is of great significance for improving the depth of directional drilling and the efficiency of deep hole directional drilling

Method used

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  • Underground-coal-mine nearly horizontal ultra-deep hole directional drilling drill string power push system and method
  • Underground-coal-mine nearly horizontal ultra-deep hole directional drilling drill string power push system and method
  • Underground-coal-mine nearly horizontal ultra-deep hole directional drilling drill string power push system and method

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Embodiment Construction

[0036] see figure 1 with 2 , shows the coal mine underground near-horizontal ultra-deep hole directional drilling drill string power propulsion system and method of the present invention.

[0037] The drill string power propulsion system for directional drilling of near-horizontal ultra-deep holes in underground coal mines includes a drill bit 1, a hydraulic auxiliary pressurizer 2, a screw motor 3, a directional drilling tool assembly 4, a first drill string group 5, a first Propeller 6, cuttings bed cleaner 7, second propeller 8, second drill string group 9 and water stool 10, the hydraulic auxiliary pressurizer 2 is installed between the drill bit 1 and the screw motor 3, so that the drill bit 1 Provides weight on bit and transmits torque.

[0038] Preferably, refer to figure 2, the hydraulic auxiliary pressurizer 2 may include a housing 21, a first piston 22, a spline drive shaft 23, an end cover 24 and a first lower joint 25, and the left side of the housing 21 is pro...

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Abstract

The invention relates to an underground-coal-mine nearly horizontal ultra-deep hole directional drilling drill string power push system and method. The push system at least comprises a drill bit, a hydraulic auxiliary pressurizer, a screw motor and directional drill tool assembly, a first drilling string set, a first pusher, a rock debris bed cleaner, a second pusher, a second drilling string setand a water pump which are arranged in sequence. According to the system, efficient application of drilling pressure during underground-coal-mine ultra-deep hole directional drilling and safe, stableand efficient pushing of drill strings are achieved, and the problem is solved that due to contact friction resistance generated during bending deformation of the drill strings in a long-distance nearly horizontal directional hole, the pushing force of a port drilling machine cannot be effectively transmitted to a drill bit; the problem is solved that increasement of friction resistance and construction risks is caused by deposition of rock debris during nearly horizontal hole-in slide drilling, and the system has important significance on increasement of directional drilling depth and improvement in deep hole directional drilling.

Description

technical field [0001] The invention relates to the technical field of underground drilling in coal mines, in particular to a drill string power propulsion system and method for directional drilling of near-horizontal ultra-deep holes in underground coal mines. Background technique [0002] At present, in the near-horizontal drilling of coal mines in my country, in the process of sliding directional drilling with screw motor, the power head of the hole drilling rig is used to propel. The contact force caused by gravity creates contact friction. When the hole depth reaches a certain level, the cumulative friction caused by the bending of the drill string is prominent, which prevents the effective transmission of the drilling pressure and produces a back pressure effect, resulting in a serious reduction in the efficiency of sliding directional drilling. The harder the formation encountered, the greater the WOB requirement, and the corresponding increase in the orifice feed for...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B7/04E21B19/086
CPCE21B7/04E21B19/086
Inventor 徐保龙姚宁平王力金新豆旭谦曹静黄寒静
Owner XIAN RES INST OF CHINA COAL TECH& ENG GROUP CORP
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