Sealing structure for soluble bridge plug

Abstract

The invention provides a sealing structure for a soluble bridge plug, and relates to the technical field of oilfield downhole tools. The butt joint position of two push rings is in the middle of a glue barrel, the two push rings are in butt joint and are connected through a connecting buckle, each push ring is connected with a baffle ring through a tension spring, the cross section of the connecting buckle is in a U shape, and vertical face ring plates on the two sides of the U-shaped connecting buckle are clamped in ring grooves of the push rings; a sharp-corner-shaped cutting edge abutting against the inner wall of the connecting buckle is arranged on the inner sides of the two vertical face annular plates of the connecting buckle and at the butt joint position of the two push rings, and a section of thin-walled pipe is arranged at the cutting edge position of the connecting buckle; and a plurality of one-way teeth facing the baffle rings extend from the outer circles of the push rings from the butt joint position. The sealing structure for a soluble bridge plug has the following beneficial effects that the expandable push rings are arranged, the connecting buckle is broken in the expansion process of the rubber barrel, the one-way teeth on the push rings perform scraping treatment on the inner wall of a sleeve at the expansion part of the rubber barrel, dirt, impurities and oil on the inner wall of the sleeve are cleaned away, the treated inner wall of the sleeve is smooth and clean, and the sealing effect of the rubber barrel is improved.

Description

Technical field: [0001] The invention relates to the technical field of oilfield downhole tools, in particular to a sealing structure for soluble bridge plugs. Background technique: [0002] The bridge plug is a commonly used downhole tool in the oilfield production process. Through the bridge plug, some formations in the downhole can be blocked for a long time or permanently to meet the relevant operation requirements. The structure of the bridge plug usually includes a rubber barrel sealing structure and a slip anchoring structure. After the bridge plug is lowered to a predetermined position in the downhole, an external force is used to push the retaining ring to squeeze the rubber barrel to expand, and the rubber barrel and the casing are sealed. The tile setting completes the installation of the bridge plug in the underground; [0003] However, there will be scale and other impurities on the surface of the inner wall of the casing in the downhole, and the surface of the...

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Problems solved by technology

[0003] However, there will be scale and other impurities on the surface of the inner wall of the casing in the downhole, and the surface of the inner wall of the casing is not smooth. It is difficult to achieve a complete seal only by squeezing the annular surface of the rubber barrel. At the same time, the oil layer attached to the inner wall of the casing is not conducive to the rubber barrel. the seal

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