Anchoring compensation separated layer water injection method and equipment

Abstract

The invention discloses an anchoring compensation separated layer water injection method and equipment. The equipment comprises a compensator, a hydraulic anchor, water distributors and a well washingvalve which are sequentially connected to an oil pipe from top to bottom; at least two water distributors are arranged and correspond to different water injection layers; a packer is connected between every two water distributors; one packer is further connected to the lower part of the lowermost water distributor; a supporting slip is further connected to the oil pipe and is located at the position between the lowermost packer and the well washing valve; the hydraulic anchor forms an anchoring mechanism at the upper part of a string; the supporting slip forms a lower supporting mechanism ofthe string; and the hydraulic anchor and the supporting slip form a bidirectional anchoring mechanism. The method and the equipment have the advantages that by means of bidirectional anchoring, long-distance compensation, safety release design and upper string optimization, the long-acting separated layer water injection and the later-period safety check and replacement are realized, and the method and the equipment have great significance in low water injection development of oilfields.

Description

technical field [0001] The invention relates to oilfield water injection technology, in particular to an anchor compensation layered water injection method and equipment. Background technique [0002] Under different conditions of high temperature and high pressure, the longitudinal force and deformation of the layered water injection string will change greatly, and the peristalsis will easily cause the damage of the packer rubber tube and cause the delamination failure of the string. In order to overcome the creep effect of the split injection string, the current main process is to configure anchoring and compensation tools, through layered water injection string anchoring and upper tubing length compensation to overcome the string creep and reduce the stress on the anchor string, improving life. The main problems of this process are: (1) In the long-term water injection process, affected by water quality and other factors, the anchoring tool is easy to corrode and scale, ...

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Problems solved by technology

[0004] The above public documents disclose the compensator, hydraulic anchor, water distributor, packer, and well flushing valve sequentially connected to the tubing. The public document is still one-way anchoring, and the anti-creep effect is not complete; , the application provides two technical solutions, one is to directly use the throw-away long-distance compensator. The relationship, detailed technical problems to be solved, and technical effects are all different, and there is no technical inspiration; another solution is to connect the lost-hand tool and multi-level compensator in series. The public document only gives the compensator, and there is no public lost-hand tool Combination with compensator

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