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Downhole hydraulic cutting tool

A technology for hydraulic slitting and tools, which is applied in wellbore/well components, mining fluids, earth-moving drilling, etc. The effect of easy maintenance and increased surface area

Active Publication Date: 2012-07-11
PETROCHINA CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Although my country's coalbed methane resources are very rich, the permeability of coal seams in coal mines is generally low, and there is currently a lack of a tool that can improve the permeability of coal seams, so the development capacity of coalbed methane is insufficient

Method used

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Embodiment Construction

[0017] In order to make the object, technical solution and advantages of the present invention clearer, the implementation manner of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0018] Such as figure 1 As shown, a kind of downhole hydraulic cutting tool described in the embodiment of the present invention includes a mover, a resetter and a nozzle 16 connected in sequence; Pipe 1, the moving inner pipe can slide relative to the moving outer pipe through a hydraulic drive device; The inner tube 2 of the mover is fixedly connected, the outer tube 10 of the resetter is fixedly connected with the outer tube 1 of the mover, and the inner tube 11 of the resetter is driven by the inner tube 2 of the mover to move along the The outer tube 10 of the reset device slides, and a reset spring 12 is arranged between the inner tube 11 of the reset device and the outer tube 10 of the reset device, and the reset spring 12 is u...

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Abstract

The invention discloses a downhole hydraulic cutting tool and belongs to the field of the development of coal gas layers. The tool comprises a shifter, a resetting device and a spraying nozzle; the shifter is driven to downwardly move by a hydraulic drive device, the spraying nozzle is driven to downwardly move, the spraying nozzle can carry out perforation and fracture on a coal layer at a specified depth through high-pressure hydraulic action, a plurality of artificial fractures can appear in the original coal layer, coal layer gas discharge passages can be formed, the gas permeability of the coal layer is increased, and the pressure drop of a large area appears around a mine hole when gas is discharged from a mine, so that the gas desorption surface area of the coal layer is increased, and the rapid and relatively-lasting discharge of coal layer gas is guaranteed; and according to the tool, the shifter is reset through resetting springs. Thus, the downhole hydraulic cutting tool has the advantages of simple structure and convenience in operation and maintenance.

Description

technical field [0001] The invention relates to coal bed gas development engineering machinery, in particular to an underground hydraulic slotting tool. Background technique [0002] Coalbed methane is a high-quality and clean energy source, which mainly exists in the coal seam in an adsorbed state, and a small amount exists in pores and cracks in a free state. From the perspective of national economic development, due to the development and utilization of coalbed methane, a large amount of high-quality clean energy that is likely to be wasted has been recovered, which has played a positive role in alleviating energy shortages and promoting national economic development. [0003] Although my country's coalbed methane resources are very rich, the permeability of coal seams in coal mines is generally low, and there is currently a lack of a tool that can improve the permeability of coal seams, so the development capacity of coalbed methane is insufficient. Contents of the inv...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/26E21B43/114
Inventor HAN JUNWANG HANXIANGWANG ZHEQI YAOGUANGLI YANXIANGLI ZENGLIANG
Owner PETROCHINA CO LTD
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