Passive-disassembly type soluble bridge plug

Abstract

The invention relates to the technical field of oil exploitation, in particular to a passive-disassembly type soluble bridge plug. The passive-disassembly type soluble bridge plug comprises a center shaft, a sealing piece, a cone body, slips and a lower connector, wherein the sealing piece, the cone body, the slips and the lower connector are sequentially mounted on the center shaft in a sleevingmode, and one or more or all of the center shaft, the sealing piece, the cone body and the lower connector are of a split structure. According to the passive-disassembly type soluble bridge plug, oneor more or all of the center shaft, the sealing piece, the cone body and the lower connector are selectively of a split structure, when the split structure is adopted in the critical parts of the soluble bridge plug, quick disassembling can be achieved through destroying the joints of the split parts, the piecemeal parts of the disassembled split parts are scattered down to a well in a split mode,full dissolving is conducted along with time, recycling is not required, and the engineering requirement is met.

Description

technical field [0001] The invention relates to the technical field of oil exploitation, in particular to a passively dismantled soluble bridge plug. Background technique [0002] Bridge plug refers to a tool used in the process of oil and gas exploitation and transportation to cut off gas and liquid transportation channels. In the process of developing low-porosity and low-permeability oil and gas fields represented by shale gas, bridge plugs are widely used in staged and layered fracturing processes to block harmful gas and liquid transportation and pressure transmission channels, restricting Pressure fluid enters the destination layer. After the fracturing operation is completed, it is generally necessary to remove the bridge plugs installed during the fracturing process. The earliest method of removing bridge plugs was to drill holes in the bridge plugs through coiled tubing. This method not only has high costs and high construction safety risks, but also makes it diff...

AI Technical Summary

Problems solved by technology

However, the current soluble bridge plugs generally have no problem in dissolving according to the nominal index under laboratory conditions, but under complex downhole conditions, the dissolving effect is not ideal, and the well fluid used as the dissolving solution does not flow well when there is a lot of sand sediment downhole. Sufficient, affecting the dissolution progress, especially in gas-producing layers, it may even lead to lack of well fluid, and even affect the dissolution effect

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