Release packer capable of well-flushing

Abstract

The invention discloses a release packer capable of well-flushing, which comprises an upper joint, a piston, a hydraulic cylinder, a separating joint, an ejector sleeve, a packing valve ball, a packing valve seat, a packing shear pin, a lock ring, a junk sub, a connected pipe, an inner pipe, an unset shear pin, an upper rubber cylinder joint, a rubber cylinder shaft, a rubber cylinder, a lower rubber cylinder joint, an upper cone, a slip sleeve, a slip, a lower cone, and a stop joint; wherein the lower cone is provided with a communicated hole and internally provided with a sliding sleeve; the sliding sleeve is positioned above the communicated hole and fixed on the lower cone; the upper part of the sliding sleeve is provided with an upper seal ring, and the lower part of the sliding sleeve is provided with a lower seal ring; a pin is positioned between the upper seal ring and the lower seal ring; a cut-off valve ball is located in the upper port of the sliding sleeve; and the diameter of the cut-off valve ball is smaller than the inner diameter of the packing valve seat. Before packing, the reverse well flushing can be carried out on an oil pipe on the packer so as to wash way sundries in the oil pipe and ensure that a packing pressure is transferred to the piston, the packer can be reliably packed and the well flushing can successfully realize oil production by layer, thereby the invention has obvious economic benefit.

Description

technical field [0001] The invention relates to a downhole layered oil recovery tool for oil recovery in an oil field, in particular to a packer capable of washing wells. Background technique [0002] It is an effective way to control the rise of water cut in oil wells by implementing layered blocking water recovery technology to seal off high aquifers. Packers are used for layered water plugging. There are many types of packers, but there are problems such as easy failure, slippage, low bearing capacity, low construction success rate, and difficulty in unsealing. There is a type of packer on site that is brought to the oil layer by the tubing to press the seat seal, and then the tubing and the packer are separated. This process is called dropping hands on site. To meet the requirements of the hydraulic seat seal, it and its lower pipe string are airtight, the internal liquid cannot come out, and the external liquid cannot enter. Therefore, the pipe string cannot be cleaned...

AI Technical Summary

Problems solved by technology

Packers are used for layered water plugging. There are many types of existing packers, but there are problems such as easy failure, slippage, low bearing capacity, low construction success rate, and difficulty in unsealing.

There is a type of packer on site that is brought to the oil layer by the tubing to press the seat seal, and then the tubing and the packer are separated. This process is called dropping hands on site. To meet the requirements of the hydraulic seat seal, it and its lower pipe string are airtight, the internal liquid cannot come out, and the external liquid cannot enter. Therefore, the pipe string cannot be cleaned after the completion of the well, resulting in the inside of the pipe string. The channel is blocked by debris, so that the pressure cannot be transmitted to the piston, and the required action cannot be completed, the packer cannot be set and sealed, and the purpose of layered oil recovery cannot be realized

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