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Two-stage two-section separate-injection pipe column capable of back-flushing well and protected by insert seal sleeve and separate-injection method of two-stage two-section separate-injection pipe column

A technology of inserting sealing and backwashing wells, applied in casing, flushing wellbore, sealing/packing, etc., can solve the problems of high overhaul probability, small inner diameter of packer central pipe, high cost, and reduce overhaul probability , The effect of large flushing channel and high success rate

Active Publication Date: 2012-12-19
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the imperfect structure of the injection string, there are still the following four deficiencies: (1) The flushing channel of the packer is small. The well flushing channel is blocked and the well cannot be flushed. On the other hand, the well flushing valve will be stuck or not closed tightly, resulting in channeling up and down the packer and affecting the separate injection effect; (2) For water injection wells that are prone to sand production, The dispensing string is prone to sand burial and sand sticking, and the probability of overhaul is high; (3) The inner diameter of the central pipe of the packer is small, and the throwing and fishing instrument is easy to be blocked and stuck, which reduces the success rate of throwing, measuring and matching; ( 4) The structure of the packer for high-temperature, high-pressure and deep-inclined wells is complex and expensive. Frequent replacement of packers and other tools during inspection and injection operations will result in large investment and high cost

Method used

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  • Two-stage two-section separate-injection pipe column capable of back-flushing well and protected by insert seal sleeve and separate-injection method of two-stage two-section separate-injection pipe column
  • Two-stage two-section separate-injection pipe column capable of back-flushing well and protected by insert seal sleeve and separate-injection method of two-stage two-section separate-injection pipe column
  • Two-stage two-section separate-injection pipe column capable of back-flushing well and protected by insert seal sleeve and separate-injection method of two-stage two-section separate-injection pipe column

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Embodiment Construction

[0016] The present invention will be further described below in conjunction with the accompanying drawings: the injection pipe string of the present invention is mainly composed of a water well bidirectional anchor 1, an insertion sealer 2, a casing prefabricated sealing cylinder 3, a water distributor 4, an insertion sealer 5, and a casing prefabricated sealing cylinder 6. Water distributor 7, oil pipe 8, double ball seat 9, screen pipe 10, plug 11, casing 12, artificial well bottom 13, first-stage water injection section 14, and second-stage water injection section 15. Insert the sealer body 2g into the axially built-in overflow channel 2e, insert the upper end of the sealer body 2g to set the water inlet 2n to communicate with the overflow channel 2e, and insert the lower end of the sealer body 2g to set the water outlet 2o to communicate with the overflow channel 2e; The water inlet piston 2d is embedded in the round hole at the upper end of the overflow channel 2e, and the...

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Abstract

The invention provides a two-stage two-section separate-injection pipe column capable of back-flushing a well and protected by an insert seal sleeve and a separate-injection method of the separate-injection pipe column. The separate-injection pipe column comprises an insert sealer (2), a sleeve prefabricated sealing cylinder (3), a first-stage water injection layer section (14), and the like; the sleeve prefabricated sealing cylinder (3) is arranged on the upper part of the top boundary of the first-stage water injection layer section (14); a sleeve prefabricated sealing cylinder (6) is arranged between the first-stage water injection layer section (14) and a second-stage water injection layer section (15); the sleeve prefabricated sealing cylinder (6) is simultaneously arranged between a water distributor (4) and a water distributor (7); the insert sealer (2) is arranged in the middle of the sleeve prefabricated sealing cylinder (3); and an insert sealer (5) is arranged in the sleeve prefabricated sealing cylinder (6). With the adoption of the separate-injection pipe column, the channeling phenomenon is effectively avoided, the successful ratio of removing sand blockage is high, and the successful ratio of drop-dipper measuring and dosing is high; and the pipe column has high adaptability to the a high-temperature and high-pressure deep deflecting well with high water injection pressure and obvious difference between layers and is long in period of validity.

Description

technical field [0001] The invention provides a second-stage and second-stage backwashable well insertion sealing sleeve and separate injection pipe string tool for water injection in the petroleum industry and a layered water injection method. Background technique [0002] At present, in the water injection development process of multi-layer reservoirs in various oil fields, separate injection strings are generally used. The split injection string mainly includes packers, water distributors, bidirectional anchors for water wells, double ball seats, screens, plugs, etc. During normal water injection, the injected water enters the formation from the tubing through the water distributor, which can generally meet the split injection requirements. Due to the imperfect structure of the injection string, there are still the following four deficiencies: (1) The well flushing channel of the packer is small, and when the water quality or well condition is poor, the particulate impuri...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/20E21B17/00E21B21/00E21B33/12
Inventor 刘扬宋祖厂盖旭波
Owner PETROCHINA CO LTD
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