Open hole sealing device

Abstract

The invention discloses an open hole sealing device. An outer variable-diameter shoulder side is arranged outside a seal inner tube. The seal inner tube is provided with a pressure transmission hole.The outer wall of the seal inner tube is provided with an upper seal ring and an outer one-way lock catch. An inner variable-diameter shoulder side is arranged inside a seal outer tube. The seal outertube is internally provided with a lower seal ring and mounted outside the seal inner tube in a sleeving manner. A one-way open lock ring is put into the upper portion of the seal outer tube. The inner wall of the open lock ring is provided with an inner one-way lock catch. The inner one-way lock catch on the inner wall of the open lock ring is matched with the outer one-way lock catch. When theinner one-way lock catch is buckled with the outer one-way lock catch, the open lock ring cannot walk up. The lower portion of a linkage sleeve is connected to the upper portion of the seal inner tube. The linkage sleeve is connected to the seal inner tube through a constant pressure shear pin. After penetrating an upper conical body, the upper portion of an inner tube is connected with the lowerportion of the seal inner tube. A rubber sleeve is mounted outside the inner tube in a sleeving manner. The upper portion of a lower conical body is connected with the lower portion of the inner tube.The open hole sealing device moves downwards to reach the bottom of an open hole shaft with the shaft body track needing to be changed, the pressure is applied inwards, and the rubber sleeve can be compressed and expanded to seal the open hole well wall.

Description

technical field [0001] The invention is equipment for well completion and workover in oil exploitation, and is an open hole plugging device. Background technique [0002] When drilling in the oil field to a certain depth, it is necessary to change the trajectory of the wellbore, and drill from the top of the drilled well bottom to another direction. In order to prevent the liquid from returning to the bottom of the drilled wellbore, the bottom of the well needs to be permanently sealed. This operation is called sealing and isolation in the oil field. Since this section of the wellbore has not been casingd, it is called sealing, isolation and other operations in the open hole wellbore. At present, when performing operations such as sealing and isolation in the open-hole wellbore, the method of sealing and isolating the bottom of the well is mostly used to seal and isolate the bottom of the well by drilling a suspended cement plug. The following problems exist in drilling su...

AI Technical Summary

Problems solved by technology

The following problems exist in drilling suspended cement plugs: (1) The cement plugging process is complicated and the cycle is long; (2) Some wells have lost circulation and well kick, and the risk of cement plugging is high; (3) The strength of cement plugs is limited, and the isolation strength low, prone to failure

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