Soluble plug

Abstract

The invention relates to a soluble plug. The soluble plug comprises an outer ring (1) capable of being rapidly dissolved and a middle part (2) capable of being dissolved slowly. The outer ring (1) isconnected with the inner wall of a working pipe barrel. An insoluble sealing layer (3) is arranged below the outer ring (1) and the middle part (2). After the ground preparation work is completed, a certain amount of water or other solution is poured into an oil pipe or a working wellbore, the outer ring (1) is dissolved, at the moment, the dissolving speed of the middle part (2) is slow or the middle part is insoluble, the outer ring (1) dissolves, and a gap or a through hole is formed between the outer ring (1) and the working pipe barrel; and the dissolving speed of the middle part (2) is slow, and the oil gas is limited. The plug unsealing mode is simple, fishing does not need to be carried out after unsealing, and production of oil and gas cannot be influenced.

Description

technical field [0001] The invention relates to the technical field of petrochemical pipeline plugging, in particular to a soluble plug. Background technique [0002] In oil and gas production, after the casing and tubing are lowered into the well, the oil and gas production is not carried out immediately, but the uphole pipeline and other facilities need to be installed and arranged. Therefore, the bottom end of the casing inserted into the well needs to be provided with a plug to isolate the downhole from the uphole. After the well preparation is completed, the plug needs to be opened for oil and gas production. The removal of conventional plugs needs to be removed mechanically. After removal, the plugs are easy to fall into the well. Since the plug itself needs to be able to withstand a certain pressure, the thickness of the plug is relatively thick. Therefore, in order to avoid the plug under the action of oil and gas Re-blocking the pipe barrel will cause complete or ...

AI Technical Summary

Problems solved by technology

The removal of conventional plugs needs to be removed mechanically. After removal, the plugs are easy to fall into the well. Since the plug itself needs to be able to withstand a certain pressure, the thickness of the plug is relatively thick. Therefore, in order to avoid the plug under the action of oil and gas Re-blocking the pipe barrel will cause complete or partial blockage of the pipe barrel. Partial blockage will affect the pressure and flow in the well, which is not conducive to the production of oil and gas. Therefore, it is necessary to salvage the dropped plug. is complex and difficult

Therefore, the practicability of conventional plugs in wells is very poor

Images