Multi-pipe layered water injection device for oilfield production

Abstract

A multi-pipe layered water injection device for oil field production relates to the technical field of oil field underground water injection tools, and comprises water injection pipes, couplings and packers, the interior of each water injection pipe is uniformly divided into a plurality of water injection channels, on one hand, the couplings are connected between the two water injection pipes in a sealing manner, so that the corresponding water injection channels on the two water injection pipes are communicated in a sealing manner; the packer is arranged between two water injection layers in a setting mode and is the same as the inner structure of the water injection pipe, an inner central channel of the packer is divided into water passing channels with the same number as the inner central channel of the packer, and the coupling is connected between the water injection pipe and the packer in a sealed mode on the other hand, so that the water injection channel of the water injection pipe is communicated with the water passing channel in the center of the packer in a sealed mode. Each water injection layer corresponds to one water injection channel opening, and the water injection pipe at the lowermost end is connected with a plug. Through the brand-new structural design of the water injection pipe, materials are saved, oil pipes are omitted, and the number of water injection channels or the cross sectional area of the water injection channels can be increased.

Description

technical field [0001] The invention belongs to the field of downhole water injection tools for oil fields, in particular to a multi-pipe layered water injection device for oil field production. Background technique [0002] Layered water injection means that a packer is lowered into the water injection well to separate the oil layers with large differences, and then the water distribution device is used to distribute water in layers, so that the water injection volume of the high permeability layer can be controlled, and the water injection of the middle and low permeability oil layers can be obtained. Enhanced, a water injection method that enables all types of oil layers to play a role. [0003] Using a water distributor to inject water in layers and adjusting the water nozzle is very complicated and has low precision, which makes the water injection operation complicated, time-consuming and expensive. In order to reduce the difficulty of layered water injection, Chinese...

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Problems solved by technology

[0005] Aiming at the problem that no more inner pipes can be placed in the oil pipe, the number of water injection layers is limited, and the problem that it is very troublesome to install the inner pipes, the present invention provides a multi-pipe layered water injection device. It is directly connected with the packer, no oil pipe is needed, and the tedious work of putting on and installing is avoided; the invention saves pipe materials and can increase the number of water injection layers

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