Anti-blocking bridge plug

Abstract

The invention discloses an anti-blocking bridge plug. The anti-blocking bridge plug comprises a central pipe, an anchoring device and a protective sleeve, wherein an adjusting short section is arranged at the upper end of the central pipe, a guide shoe is arranged at the lower end of the central pipe, the anchoring device is arranged in the middle of the central pipe, the anchoring device comprises an upper slip and an upper cone which are arranged at the upper part of the central pipe in a sleeving manner, and a lower slip and a lower cone which are arranged at the lower part of the central pipe in a sleeving manner, the protective sleeve is detachably connected to the upper end of the central pipe in a sleeving mode, and the protective sleeve is arranged outside the adjusting short section and the upper slip in a sleeving mode, when the lower cone and the lower slip move relatively, the lower slip is pushed to be opened and anchored to a casing pipe, and after the protective sleeve is detached, the upper cone and the upper slip move relatively to push the upper slip to be opened and anchored on the casing pipe, According to the anti-blocking bridge plug, the slip can be prevented from being accidentally opened through the protective sleeve, and the situation that the bridge plug is blocked and blocked before entering a preset position, and setting is conducted in advance is avoided.

Description

technical field [0001] The invention relates to an anti-blocking bridge plug, which belongs to downhole plugging tools for oil and gas wells. Background technique [0002] Bridge plug is a downhole tool used to complete the plugging operation of oil and gas wells. On the shoe; during the setting process, the upper pulling force exceeds the rupture tension of the slip, and the upper and lower cones produce axial extrusion deformation on the rubber sealing cylinder. After setting, the rubber tube achieves expansion and sealing, and the upper and lower slips are broken and embedded on the inner wall of the casing; after setting, the bridge plug separates the adjacent formations, and the plugging is completed. [0003] When the wellbore wall is not clean and irregular, conventional bridge plugs are prone to the problem of slips being accidentally stretched and set ahead of time, especially in horizontal wells, the probability of early setting of the bridge plug is greater. Once...

AI Technical Summary

Problems solved by technology

[0003] When the wellbore wall is not clean and irregular, conventional bridge plugs are prone to the problem of slips being accidentally stretched and set ahead of time, especially in horizontal wells, the probability of early setting of the bridge plug is greater. Once the bridge plug is set, only The bridge plug can be ground into pieces by grinding and milling, which brings a lot of trouble to the later construction

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