Balance valve for continuous oil pipe multi-layer fracturing operation
A technology of balance valve and fracturing, which is applied in the direction of wellbore/well valve device, production fluid, wellbore/well parts, etc. Coiled tubing multi-layer fracturing balance valve and other problems, to achieve the effect of simple valve switch
Active Publication Date: 2012-04-04
PETROCHINA CO LTD
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Problems solved by technology
[0002] Coiled tubing multi-layer fracturing operations use rubber cup packers. Due to the small weight of coiled tubing, the compression packer will not be properly set
At present, there is no report on the use of counterbalance valves in coiled tubing multi-layer fracturing operations
Method used
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Embodiment 1
[0013] Embodiment 1: Taking a balance valve used in coiled tubing multi-layer fracturing operations as an example, the present invention will be further described in detail. The diameter of the coiled tubing is 53.97mm (2 1 / 4 "").
[0014] refer to figure 1 . The balance valve used in coiled tubing multi-layer fracturing operations of the present invention mainly consists of an upper joint 1, a central pipe 2, a sealing pipe 3, a grid ring 4 for a hole, a retaining ring 5, a grid ring 6 for a shaft, and a steel ball 7 And the lower joint 8 is formed.
[0015] The outer diameter of the central tube 2 is 50mm. The upper end of the central pipe 2 has an external thread, and the upper end of the central pipe 2 is threadedly connected with an upper joint 1, and the upper joint 1 adopts an oil pipe collar; four balance holes A are evenly distributed on the wall of the central pipe 2. The four balance holes A are at the same height; the four balance holes A are milled long ho...
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The invention relates to a balance valve for continuous oil pipe multi-layer fracturing operation, which is applied to oil field underground continuous oil pipe multi-layer fracturing operation. The upper end of a central pipe is in threaded connection with an upper joint; a balance hole is formed on the wall of the central pipe; a sealing ball seat is arranged at the lower end of the inner wall of the central pipe and is provided with a steel ball and a baffle ring; the outer wall of the central pipe is provided with an outward protruding circular step; the lower part of the circular step of the central pipe is provided with a downward cylindrical pipe; the outer wall of the central pipe is sleeved with a sealing pipe; the diameter of the inner wall of the upper end of the sealing pipe is the same as the diameter of the outer wall of the central pipe; an annular groove on the inner wall of the middle part of the sealing pipe is sleeved outside the outward protruding annular step on the outer wall of the central pipe; and the lower end of the sealing pipe is in threaded connection with a lower joint. The balance valve has the advantages that: a pipe column generates down pressure by means of liquid pressure, and a compression packer is safely set; and the balance valve can be repeatedly opened and closed underground, and is reused.
Description
technical field [0001] The invention relates to the technical field of oil field downhole operations, in particular to an downhole operation tool, which is a balance valve used for coiled tubing multilayer fracturing operations. Background technique [0002] The coiled tubing multi-layer fracturing operation uses a cup-type packer. Due to the small weight of the coiled tubing, the compression packer will not be well set. At present, there is no report on the use of counterbalance valves in coiled tubing multi-layer fracturing operations. Contents of the invention [0003] The purpose of the present invention is to provide a balance valve for coiled tubing multi-layer fracturing operations, which is used for coiled tubing fracturing operations. [0004] The technical solution adopted in the present invention is: the balance valve used for coiled tubing multi-layer fracturing operations, which mainly consists of an upper joint, a central pipe, a sealing pipe, a grid ring fo...
Claims
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IPC IPC(8): E21B34/06E21B43/26
Inventor 袁新生黄新业韩光耀
Owner PETROCHINA CO LTD