Automatic pressure balancing device for casing liquid column

By designing an automatic casing fluid column pressure balancing device, the automatic adjustment of the internal and external pressure difference and the lubrication protection of the sealing ring are realized, which solves the device damage and safety hazards caused by the pressure imbalance of the internal and external fluid columns in the casing, and improves the casing running efficiency and wellbore stability.

CN120889526AActive Publication Date: 2025-11-04YANGZHOU RUIDE PETROLEUM MASCH CO LTD
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Patent Information

Application Number
CN202511358002.2
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-09-23
Publication Date
2025-11-04
Estimated Expiration
2045-09-23

AI Technical Summary

Technical Problem

During the casing string lowering process, pressure imbalance between the liquid columns inside and outside the casing can lead to equipment damage, high labor intensity for workers, high energy consumption, numerous safety hazards, and wellbore instability.

Method used

An automatic pressure balancing device for casing fluid column was designed, including an upper connector, a sliding sleeve, a sealing ring, a pressurizing component, and a lubrication component. It achieves internal and external pressure differential balance by automatically adjusting the hydraulic oil, thereby enhancing the sealing performance and providing lubrication protection for the sealing ring.

Benefits of technology

It effectively prevents equipment damage due to pressure differential, reduces the labor intensity and energy consumption of workers, increases the casing speed, reduces safety hazards, and ensures well wall stability and sealing effect.

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Abstract

The invention relates to the technical field of oil exploration, and discloses a casing liquid column pressure automatic balancing device which comprises an upper connector, a lower connector and a pressure balancing device. The outer sleeve is arranged outside the upper joint; the first shear pin is arranged on the inner side of the upper connector. When the whole device is tripped into a well, the internal and external pressure difference can be balanced, so that the whole device can be prevented from being extruded and damaged by the liquid column pressure difference generated due to untimely grouting, the labor intensity of workers can be reduced, a large amount of energy consumption for casing running pump starting grouting is saved, and the problem that the grouting pipeline is not firmly fixed and cannot be damaged is solved. And manual grouting at a well mouth is not needed, the potential safety hazard in the grouting process is reduced, the casing running speed is improved by more than 30%, the time is saved, the time efficiency is improved, air is prevented from being pressed into a well in the grouting process, and the well wall instability and well control risk caused by the pressure of a liquid column in the well are reduced.
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