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A composite material application repair pipe string and method

A technology of composite materials and repair pipes, which is applied in the field of oil well treatment and production recovery technology, can solve the problems of inconvenient promotion, high price, complicated process, etc., and achieve the effects of reducing operating costs, prolonging the cycle, and improving sealing and pressure-bearing performance

Active Publication Date: 2021-04-30
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to overcome the problems of complex, expensive and inconvenient popularization of the existing technology, the present invention provides a composite material application repair pipe string and its method. The present invention squeezes the liquid composite material downhole, and solidifies and glues it after fully contacting the casing wall. , forming a reliable ring subsidy segment

Method used

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  • A composite material application repair pipe string and method
  • A composite material application repair pipe string and method

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Embodiment 1

[0024] In order to overcome the problems that the existing technology is complex, expensive and not easy to popularize, the present invention provides such Figure 1-2 Shown is a composite material application and repair pipe string and method. The invention squeezes the liquid composite material downhole, and solidifies and glues it after fully contacting the casing wall to form a reliable ring subsidy section. The present invention can be directly used as a plugging subsidy for casing corrosion and leaks, and can also be used as a downhole hanging plug sealing section to rebuild the hanging plug section, cooperate with a pipe string with a special plug, and cut off the connection between the water outlet section and the oil layer section after suspension insertion. Unicom, to achieve the purpose of isolation.

[0025] A composite material application repair pipe string, including a tubing 1, a glue cylinder 2, a liquid composite material 4, a squeeze device, a section to be ...

Embodiment 2

[0029] Based on Embodiment 1, in this embodiment, the lower end of the hydraulic anchor 14 is provided with a plug 15 .

[0030] The hydraulic anchor 14 is connected with the extrusion device through a connection short 13 .

[0031] The squeeze injection device includes an upper rubber cylinder 2, a central tube 3, a squeeze piston 5, a power fluid inlet 6, a squeeze cavity 7, an injection port 11 and a lower rubber cylinder 12, and the upper rubber cylinder 2 and the lower glue cylinder The cylinders 12 are sleeved on both ends of the center pipe 3 respectively. The subsidized liner 10 is arranged outside the center pipe 3 .

[0032] The liquid composite material 4 is located in the cavity between the subsidized liner 10 and the central pipe 3 . A composite material application method for repairing a pipe string, the specific steps are:

[0033] Step 1. Select the subsidy section: first, carry out engineering logging to clarify the corrosion and leakage of the casing, selec...

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Abstract

The invention provides a composite material application and repair pipe string and method, including oil pipes, glue tubes, liquid composite materials, squeeze injection devices, sections to be subsidized, casings, subsidized liners, hydraulic anchors and subsidized sections; The oil pipe is located in the casing, and the lower end of the oil pipe is connected with a squeeze device and a hydraulic anchor in sequence. The squeeze device is provided with a subsidized liner, and the subsidized liner corresponds to the position of the section to be subsidized on the casing. The liquid The composite material is located in the extrusion unit. In the present invention, the liquid composite material is fully contacted with the casing wall and then solidified and glued to form a very reliable collar subsidy section. The present invention can be directly used as a plugging subsidy for casing corrosion and leaks; it can also be used as a downhole suspension sealing section, which cooperates with a pipe string with a plug, and suspension insertion cuts off the communication between the water outlet section and the oil layer section, avoiding the need for a packer The problem of lax setting and well workover causes damage, and the invention effectively prolongs the treatment cycle of casing damaged wells and reduces operating costs.

Description

technical field [0001] The invention relates to a composite material sticking and repairing pipe string and a method thereof, in particular to an oil well treatment and production resumption process in which an oil layer and a water layer are connected due to casing damage and corrosion perforation. Background technique [0002] With the continuous increase of oilfield development time, downhole casings have successively broken due to corrosion and other reasons, resulting in the connection between the water-producing formation and the oil layer, which not only seriously affects the normal production of oil and water wells, but also may pose a pollution threat to groundwater sources. The commonly used techniques for casing broken well treatment include casing subsidy, chemical plugging, secondary cementing, and packer isolation, among which the packer isolation process is simple, convenient to construct, and low in cost, accounting for 80% of the casing broken well treatment....

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B29/10
CPCE21B29/10
Inventor 梁万银巨亚锋王尚卫张雄涛刘江波罗有刚赵鹏玉江智强白小佩胡相君
Owner PETROCHINA CO LTD