Offshore Oilfield Water Injection Well Dual Channel Flow Control System and Method

Abstract

A dual-channel flow control system and method for water injection wells in offshore oil fields. The lower end of the first-stage cable insertion seal is connected to the upper end of the first-stage dual measurement and control channel water distributor located in the first water injection zone; the upper end of the first-stage cable insertion seal is connected to the The lower end of the second-stage dual measurement and control channel water distributor in the second water injection layer is connected; the upper end of the second-stage dual measurement and control channel water distributor is connected to the lower end of the second cable insertion seal; the upper end of the second stage cable insertion seal is connected to the third water injection layer section The lower end of the third-stage dual measurement and control channel water distributor is connected; the upper end of the third-stage dual measurement and control channel water distributor is connected to the lower end of the cable positioning seal; the upper end of the cable positioning seal is connected to the oil pipe at the upper end of the water injection string; the ground comprehensive diagnosis analysis control instrument is passed through the signal cable It is connected in series with the third-stage dual-channel water distributor for measurement and control, the second-stage dual-channel water distributor for measurement and control, and the first-stage dual-channel water distributor for measurement and control to form a dual-channel flow control system with a large test range for the water injection well, so that the water injection well can be automatically measured and adjusted. Laminar flow.

Description

technical field [0001] The invention relates to a dual-channel flow control system and method for water injection wells in offshore oil fields. Background technique [0002] Oilfield water injection development is one of the main development methods of many oilfields. Compared with land oilfields, the single well injection volume of water injection wells in offshore oilfields is large, but due to the prominent contradictions between layers in offshore oilfields, the problem of uneven injection volume in each layer is very obvious. Taking the Bohai Oilfield as an example, the single-day injection volume of a layer with better water absorption capacity in an injection well can be as high as thousands of cubic meters, while the single-day injection rate of layers with poor water absorption capacity can be as low as tens of cubic meters. At present, the water distributors commonly used in the oil and gas field are mainly divided into traditional fishing water distributors, wate...

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Problems solved by technology

[0004] The main purpose of the present invention is to overcome the above-mentioned shortcomings of the existing products, and provide a dual-channel flow control system and method for offshore oilfield water injection wells, which solves the problem of automatic flow control under the demand of large test ranges in offshore oilfields. Passive measurement and adjustment is changed to active automatic measurement and adjustment, which is suitable for layered water injection testing and deployment in large test ranges of offshore oilfields

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