Multilayered system water injection method with separate mass and separate pressure and water injection pipe column

Abstract

The invention discloses a multilayered system water injection method with separate mass and separate pressure and a water injection pipe column. The pipe column comprises constant-flow water distribution devices, packers and bridge type water distribution devices which are sequentially connected to an oil pipe from top to bottom or the bridge type water distribution devices, the packers and the constant-flow water distribution devices which are sequentially connected to the oil pipe from top to bottom, wherein each constant-flow water distribution device, each packer and each bridge type waterdistribution device or each bridge type water distribution device, each packer and each constant-flow water distribution device are taken as a combined unit; at least two combined units are connectedto the oil pipe in series; one packer is further arranged between every two combined units; the center of the oil pipe is provided with an inner pipe; an oil inner annulus is formed between the oil pipe and the inner pipe; and the inner pipe directly penetrates through the constant-flow water distribution devices and the packers and is connected with an inner center pipe of each bridge type waterdistribution device. The multilayered system water injection method with the separate mass and the separate pressure and the water injection pipe column can realize injection with the separate mass and the separate pressure of three layers or above, has relatively strong advantages in the field of large pressure difference wells and injection with the separate mass and the separate pressure, canincrease the qualified rate of a layer section and improves the water injection development effect.

Description

technical field [0001] The invention relates to an oil well water injection technology, in particular to a multi-layer system water injection method and a water injection pipe column. Background technique [0002] In the later stages of development of high water-cut oilfields, the conflicts between layers are becoming more and more prominent. Water injection wells cannot inject water into low-permeability layers, and high-permeability layers are fingered seriously. Balanced displacement cannot be achieved, and the development effect of water flooding is reduced. For water wells with large differences between layers, the conventional single pipe has problems such as deployment difficulties, short injection validity period, and high energy consumption, which cannot meet the needs of field applications. In view of the above situation, the double-pipe layered water injection process is generally adopted at present, and different pressures and water quality grades are used for th...

AI Technical Summary

Problems solved by technology

However, this process can only achieve effective injection of two layers, which cannot meet the needs of subdivided water injection for multi-layer systems on site.

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