Anti-falling soluble bridge plug

By setting a main piston and a secondary piston in the soluble bridge plug to transmit thrust, the cone expands and anchors independently. Combined with the soluble material, the problem of bridge plug slip loosening and falling off is solved, and reliable anchoring in irregular sleeves is achieved.

CN122148235AActive Publication Date: 2026-06-05DAQING PUQING DRILLING & PROD EQUIP MFG CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
DAQING PUQING DRILLING & PROD EQUIP MFG CO LTD
Filing Date
2026-05-08
Publication Date
2026-06-05

AI Technical Summary

Technical Problem

The slips of existing soluble bridge plugs may loosen or fall off under irregular sleeve conditions, affecting the fixation effect.

Method used

A soluble bridge plug designed to prevent detachment is used. The thrust of the setting tool is transmitted to each cone through the main piston and the auxiliary piston. Each cone expands independently under hydraulic pressure to anchor the sleeve, avoiding overall expansion. Stepping pins are set so that the rubber sleeve expands first and then the slip is anchored. Soluble rubber and metal materials are used.

Benefits of technology

This design enables the bridge plug slips to be completely anchored to the inner wall of the casing without being affected by the inner diameter of the casing, thus avoiding damage to the rubber sleeve caused by simultaneous operation and improving the fixing reliability of the bridge plug.

✦ Generated by Eureka AI based on patent content.

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    Figure CN122148235A_ABST
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Abstract

The application discloses a falling-prevention soluble bridge plug and relates to the technical field of oilfield downhole tools. A main piston is matched with a cylinder sleeve and an upper central pipe through a sealing ring gap, is divided into a sleeve, and three upper and lower through cylinder barrels are opened on the sleeve. The three cylinder barrels are uniformly arranged in a circle, and a slave piston is arranged in each of the three cylinder barrels. The slave piston is matched with the cylinder barrel through a sealing ring gap, and a lower end of the slave piston extends out of the sleeve. A space below the main piston is filled with hydraulic oil. The application has the beneficial effects that: the main piston and the slave piston are arranged, the pushing force of the setting tool is transmitted to the slave piston and each cone through the hydraulic pressure, the pressure of each cone when anchoring the slip comes from the hydraulic pressure caused by the pushing force of the main piston descending, each slip connected with each cone expands outward to anchor the casing, rather than expanding as a whole, the anchoring force of each expanded slip under the action of the certain hydraulic pressure is the same, and does not depend on the size of the inner diameter of the casing, so that the slip can be completely anchored on the inner wall of the casing.
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