Plugging device

Abstract

The invention discloses a plugging device which comprises a central pipe, a power mechanism, an anchoring mechanism, a rubber sleeve, a balancing mechanism and a locking mechanism sleeved on the central pipe, wherein a liquid outlet is formed on the central pipe; the anchoring mechanism comprises a first slip mechanism and a second slip mechanism; the power mechanism comprises a hydraulic cylinder sleeve, an upper sitting seal piston and a lower sitting seal piston; the hydraulic cylinder sleeve sleeves on the exterior of the central pipe; under the hydraulic effect, the power mechanism can push the first slip mechanism, the second slip mechanism and the rubber sleeve to seal in a sitting form; the locking mechanism can prevent the rubber sleeve from rebounding, so as to maintain the sitting seal state of the rubber sleeve; the balancing mechanism comprises a balancing cylinder and a balancing piston; the balancing cylinder sleeves on the exterior of the central pipe; the balancing piston is located in the balancing cylinder; a pressure inlet which is introduced to the position under the balancing piston is formed under the rubber sleeve; the balancing piston can move so as to balance the pressure under the rubber sleeve under the sitting seal state.

Description

technical field [0001] The invention relates to the field of oil exploitation, in particular to a plugging device. Background technique [0002] In the middle and late stages of oilfield development, the water content of the oilfield has risen sharply, and the contradiction between layers has intensified. It is urgent to block water in layers and realize oil recovery in sub-layers. [0003] At present, the two-way anchoring tools mainly used in oil well production adopt a single-slip double-cone structure, and there are common problems such as easy setting in the middle, difficulty in disengaging the lower cone, and difficulty in springback of the rubber tube. Contents of the invention [0004] In view of the above disadvantages, it is necessary for the present invention to provide a blocking device capable of solving at least one of the above technical problems. [0005] The present invention adopts following technical scheme to realize above-mentioned object: [0006] ...

AI Technical Summary

Problems solved by technology

[0003] At present, the two-way anchoring tools mainly used in oil well production are single-slip and double-cone structures, and there are common problems such as easy setting in the middle, difficulty in disengaging the lower cone, and difficult springback of the rubber tube.

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