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A self-balancing packer and method

A self-balancing, packer technology, used in sealing/packing, earthwork drilling, wellbore/well components, etc., can solve problems such as poor unpacking effect of packers, and reduce sand sticking. Risk, the effect of quick unblocking

Inactive Publication Date: 2011-12-21
CHINA NAT PETROLEUM CORP CHUANQING DRILLING ENG CO LTD CHANGQING DOWNHOLE TECH CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The main purpose of the present invention is to provide a self-balancing packer and method to overcome the problem of poor unsealing effect of existing packers

Method used

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  • A self-balancing packer and method
  • A self-balancing packer and method
  • A self-balancing packer and method

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Embodiment Construction

[0014] figure 1 A self-balancing packer, including an inner center pipe 2 and an outer center pipe 3 located in the packer, the outer center pipe 3 is sleeved on the inner center pipe 2, and the inner center pipe 2 and the outer center pipe 3 are formed In the first annulus, the rubber sleeve 5 is set on the outer central pipe 3. The rubber sleeve 5 divides the packer into upper and lower sections. The diameter is extended, and the diameter of the equal-diameter extension section is smaller than that of the upper and lower packing sections. The equal-diameter extension section of the rubber tube 5 is fixed on the outer central tube 3 by the upper and lower rubber tube seats 4, and the upper and lower ends of the inner central tube 2 and the upper and lower rubber tubes. The sleeve seat 4 is respectively connected to the upper joint 1 and the lower joint 6 , and a second annular space is formed between the rubber sleeve 5 and the outer central pipe 3 , and the second annular sp...

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Abstract

The invention relates to a self-balanced packer and belongs to the technical field of oil and gas field reservoir reformation. The self-balanced packer is characterized by comprising an inner central tube and an outer central tube which are positioned in the packer, wherein the outer central tube is sleeved on the inner central tube; a first annular space is formed between the inner central tube and the outer central tube; a packing element is sleeved on the outer central tube, and separates the packer into an upper section structure and a lower section structure; a packing section of the packing element has a large outer diameter; two ends of the packing section of the packing element extend upwards and downwards in an equal diameter manner; the diameter of an equal diameter extension section is smaller than that of an upper and lower packing section; the equal diameter extension section of the packing element fixes the packing element on the outer central tube through upper and lower packing element seats; the upper and lower ends of the inner central tube and the upper and lower packing element seats are connected with an upper joint and a lower joint; a second annular space is formed between the packing element and the outer central tube, and is communicated with a seat packing pressure transfer hole in the upper joint; and the lower joint is provided with a lower annular space pressure introducing hole facing downwards in the radial direction. The self-balanced packer solves the problem that the conventional packer has a poor effect.

Description

technical field [0001] The invention relates to a self-balancing packer, which belongs to the technical field of oil and gas field reservoir transformation, and is one of the important downhole operation tools in oil and gas field multi-layer layered fracturing and acidizing construction operations, especially for exploration wells, evaluation Wells and wells with a large interlayer pressure difference are used in the lower packer of double-sealed pressure construction, and in the process string that requires the packer to be unsealed quickly after fracturing. Background technique [0002] Packer is the most important conventional tool in oilfield fracturing and acidizing operations. At present, the K344 packer used in large quantities does not have the self-balancing function of the upper and lower annulus pressure of the rubber cylinder. There is a certain pressure difference, which in turn creates a certain pressure difference inside and outside the packer, which slows d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B33/126
Inventor 苏敏文邓小强隆世明张文徐红
Owner CHINA NAT PETROLEUM CORP CHUANQING DRILLING ENG CO LTD CHANGQING DOWNHOLE TECH CO
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