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Liquid-controlled liquid flooding coiled tubing drilling tractor

A coiled tubing and tractor technology, applied in the field of coiled tubing drilling tractors with hydraulic control and liquid drive, can solve the problems of poor traction force, no torsion-bearing capacity, and long length of tractors in downhole tractors, so as to ensure circulation space, The effect of strong traction ability and high reliability

Pending Publication Date: 2018-07-03
SINOPEC SSC +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to solve the problems of poor traction force, poor drilling fluid circulation ability, poor wellbore diameter adaptability, no torsion bearing capacity and too long tractor length of the current downhole tractor, the present invention provides a coiled tubing drilling system with hydraulic control and liquid drive. retractor

Method used

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  • Liquid-controlled liquid flooding coiled tubing drilling tractor
  • Liquid-controlled liquid flooding coiled tubing drilling tractor
  • Liquid-controlled liquid flooding coiled tubing drilling tractor

Examples

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Embodiment Construction

[0048] The present invention will be further described below in conjunction with the accompanying drawings.

[0049] exist figure 1 Among them, a coiled tubing drilling tractor with hydraulic control and liquid drive includes a propulsion cylinder 1, a rear slip cylinder 2, a rear slip 3, a central valve group 4, a front slip cylinder 5, and a front slip 6.

[0050] exist figure 2 Among them, the propulsion cylinder 1 includes a connecting cylinder head 11, a propulsion cylinder barrel 12, a thick center pipe A13, a propulsion cylinder piston 14, a thick center pipe B15, a propulsion cylinder cover 16, a propulsion cylinder head seal guide element 17, a propulsion cylinder piston The seal guide element 18, the push cylinder piston seal 19, and the seal guide element 110 connected to the cylinder head. The connecting cylinder head 11 and the propulsion cylinder head 16 are threadedly connected to both ends of the propulsion cylinder barrel 12, and the thick center pipe A13 a...

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Abstract

The invention provides a liquid-controlled liquid flooding coiled tubing drilling tractor. The liquid-controlled liquid flooding coiled tubing drilling tractor comprises a propulsion cylinder, a rearslip cylinder, a rear slip, a central valve group, a front slip cylinder and a front slip. The propulsion cylinder provides traction force to a central pipe, and the slip cylinders can push the slipsto tightly support a well wall; and at the same time, the torque withstood by a drill bit is transmitted to the slips through allen keys and cylinder barrels of the slip cylinders, the slips can effectively and tightly support the well wall when the slip cylinders are passed through by high pressure. The tractor is controlled and driven by high-pressure drilling fluid provided in coiled tubing, nocable is required to supply electric energy, and the effective circulation space of the drilling fluid is ensured. A supporting mechanism can meet requirements of different borehole diameters, has atorque-withstanding design, and provides the traction force while withstanding the torque transmitted by the drill bit to apply drilling pressure to the drill bit. The tractor is designed with a single propulsion cylinder and has a short length and is suitable for coiled tubing drilling in horizontal sections.

Description

technical field [0001] The invention relates to a downhole traction tool used for coiled tubing drilling in the field of petroleum exploration and development, in particular to a coiled tubing drilling tractor for hydraulic control and liquid flooding. Background technique [0002] When drilling a horizontal well with coiled tubing, because the coiled tubing does not rotate during the drilling process, there are problems such as severe drilling resistance and the inability to apply the WOB to the drill bit. The downhole tractor is a downhole tool that can provide traction at the bottom of the well. The problems existing in the current downhole tractor are: it needs to be connected with a cable, driven or controlled by electricity, so it needs to be equipped with a separate downhole cable, and the traction ability of the electric drive is poor, which reduces the application range of the tractor. Liquid circulation efficiency; the peripheral size is large, only suitable for ...

Claims

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Application Information

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IPC IPC(8): E21B23/04
CPCE21B23/04
Inventor 尹文波王新峰曲刚李亚伟
Owner SINOPEC SSC
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