A permanent bridge plug that can be unsealed

A bridge plug and permanent technology, applied in sealing/isolation, wellbore/well components, earthwork drilling and production, etc., can solve problems such as difficult unsealing, difficult recovery, high risk of milling, etc., to meet the needs of isolation, easy The effect of unblocking

CN109798088BActive Publication Date: 2021-07-09荆州市赛瑞能源技术有限公司
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2021-07-09

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Abstract

The invention relates to an unsealable permanent bridge plug, which belongs to the technical field of isolation tools for downhole operation of oil and gas wells. There is a release ring; a pressure piece is installed on the circumference of the center tube inside the release ring, and a guide shoe is installed on the other end of the center tube, and a plug is installed in the port of the center tube corresponding to the guide shoe. The hand shear pins are connected with each other; the rubber cylinder assembly is installed on the circumference of the center tube inside the guide shoe, and slips are installed on the center tube between the pressure part and the rubber cylinder assembly through the upper cone and the lower cone; the bridge plug It has the characteristics of safe well killing, no need for milling and recovery tools, and easy unsealing. The rubber cartridge and slips are set under pressure; the unsealing pin is directly pressed and sheared to achieve unsealing, which solves the problem of existing bridge plug wear. The problems of high milling risk, difficult recovery and difficult unsealing meet the isolation needs of downhole operations.
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Description

technical field

[0001] The invention relates to an unsealable permanent bridge plug, which belongs to the technical field of isolation tools for downhole operation of oil and gas wells. Background technique

[0002] In the process of oilfield development going deep into the well, the sealing and layering operations run through the entire operation process. Due to the high bottomhole pressure, when the wellhead operation equipment needs to be replaced, repaired or temporarily blocked, it is necessary to pump a large amount of high-density well killing fluid for well killing operation, which will cause serious pollution to the formation; the subsequent transfer to normal work At the same time, it is necessary to replace the killing fluid out of the wellhead with conventional well completion fluid. This operation has a relatively large risk and is prone to blowout safety accidents. The bridge plug can better solve these problems: After the bridge plug is set and sealed, it sep...

Examples

Embodiment Construction

[0027] The unsealable permanent bridge plug is composed of a central tube 1, a pressurizing piece, a slip 2 and a rubber cartridge assembly. One end port of the central tube 1 is threaded with a release ring 3, which is used to connect the setting joint Package 23, the release ring 3 is provided with a pre-break ring groove, so that after the setting is completed, it will break to complete the setting. The inner side of the release ring 3 is equipped with a pressure piece on the circumference of the central tube 1, and the pressure piece is composed of the lock ring seat 4, The lock ring sleeve 5 and the lock ring 6 are composed, the lock ring seat 4 is connected and fixed with the central tube 1 through the unsealing shear pin 7, and the unsealing shear pin 7 is used to limit the lock ring seat 4 before setting, and lock The ring seat 4 is equipped with a lock ring sleeve 5 through the lock ring 6, and the lock ring sleeve 5 is connected with the lock ring seat 4 through the u...