A four-pipe layered water injection process string

Abstract

The invention discloses a four-tube layered water injection technology tubular column which comprises a sleeve and a shaft mouth. The sleeve is internally provided with an upper bridge plug, a middle bridge plug and a lower bridge plug from top to bottom in sequence at intervals, the upper bridge plug, the middle bridge plug and the lower bridge plug divide the interior of the sleeve into four sections in the axial direction, each section corresponds to a water injection layer section, a water injection pipe is composed of an outer layer oil pipe, a middle layer oil pipe and an inner layer oil pipe which are coaxial, and the outer layer oil pipe, the middle layer oil pipe and the inner layer oil pipe divide the interior of the sleeve into a sleeve outer annular water injection channel, an outer middle annular water injection channel, a middle inner water injection channel and a center water injection channel in the radial direction. Each layer section of the four-tube layered water injection technology tubular column is provided with an independent water injection channel, a water distribution device does not need to be arranged under a shaft, quantitative water distribution which is completed through ground operation is achieved, control over water distribution amount is more accurate, and adjustment is more convenient. The four-tube layered water injection technology tubular column has the advantages of being simple in structure, reliable in work, convenient to manipulate, easy to maintain and the like.

Description

technical field [0001] The invention relates to an oil well water injection process string, in particular to a four-tube layered water injection process string. Background technique [0002] In the prior art, eccentric layered water injection strings are often used for oil well layered water injection. This type of string is centered on the tubing, and the oil well is divided into several layers by packers, and connected at the layers and positions that need to be injected. Eccentric water distributor, this kind of eccentric layered water injection string can realize two-stage two-stage and three-stage three-stage layered water injection. However, the eccentric water distributor of this kind of eccentric layered water injection string is set in the downhole, and the adjustment of the water injection volume needs to be realized by throwing and pulling the plug to replace the water nozzle, and a test vehicle is required, which has complicated operation, inaccurate adjustment, ...

AI Technical Summary

Problems solved by technology

However, the eccentric water distributor of this kind of eccentric layered water injection string is set in the downhole, and the adjustment of the water injection volume needs to be realized by throwing and pulling the plug to replace the water nozzle, and a test vehicle is required, which has complicated operation, inaccurate adjustment, and high maintenance costs. Disadvantages: Once the water distributor fails during use, the entire pipe string can only be pulled out for replacement, and the packer is not unsealed during the process of pulling out the pipe string, which may cause the well to get stuck, which will generate a lot of maintenance costs and waste Manpower and material resources

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