Layered steam driving packer with combination effect

Abstract

The invention provides a layered steam driving packer with a combination effect. The layered steam driving packer with the combination effect comprises a central tube, an outer central tube and an expanding portion, wherein an upper joint and a lower joint are correspondingly connected to two ends of the central tube through outer threads; a pressure transferring hole is formed in a side wall of the central tube; the outer central tube sleeves the central tube; the upper end of the outer central tube can be connected with the outer side surface of the upper joint in a separating mode; an adjusting ring and a sealing rubber barrel sleeve the outer side of the outer central tube; the expanding portion comprises an expanding inner barrel; the expanding inner barrel sleeves the outer central tube; an expanding jacket sleeves the expanding inner barrel; a sealing cavity is formed between the expanding inner barrel and the expanding jacket and is filled with expanding liquid; the upper end of the expanding jacket is in contact with the lower end of a sealing rubber barrel; and a locking and retaining mechanism is arranged between the expanding inner barrel and the outer central tube. During liquid injection, a pushing portion which can push the expanding portion to move upwards sleeves the central tube, is adjacent to the lower side of the expanding portion, and is hermetically connected with the outer side surface of the lower joint, a sealing ring cavity is formed between the pushing portion and the outer side surface of the lower joint and is connected with the pressure transferring hole, and liquid can be injected into the sealing ring cavity.

Description

Technical field [0001] The invention belongs to the field of petroleum exploitation, and specifically relates to a combined action stratified steam drive packer for heavy oil and super heavy oil steam drive. Background technique [0002] The heavy oil and ultra-heavy oil blocks in the Liaohe Oilfield mainly adopt steam flooding and steam stimulation. Steam flooding is an important production method for heavy oil exploitation in the Liaohe Oilfield. Due to the long construction period and high well temperature of steam flooding process wells, the downhole working conditions of steam flooding process wells are bad, and the well temperature is high. In order to ensure that the steam does not leak up in the annulus between the string and casing, the packer needs to have a good seal In addition, long-term steam injection requires high temperature resistance and sealing performance of the seals. It is particularly important to adopt a reasonable setting method. The existing setting met...

AI Technical Summary

Problems solved by technology

Due to the long construction period and high well temperature of the steam flooding process well, the downhole working conditions of the steam flooding process well are harsh, and the well temperature is high. In order to ensure that the steam in the annular space between the pipe string and the casing does not leak upward, the packer needs to have a good seal performance, and the long-term injection of steam requires high temperature resistance and sealing performance of the seals. It is particularly important to adopt a reasonable sealing method. The existing sealing methods mostly use a single hydraulic sealing or thermal sealing method. With the degree of mining The conventional and general steam flooding and layer-by-layer steam flooding production methods have poor sealing effects, and can no longer solve the problems of large inter-layer differences and inter-layer interference.

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