Intelligent water injection device and method

Abstract

The invention provides an intelligent water injection device and method. The intelligent water injection device comprises a valve, a wellhead flowmeter and downhole differential pressure water distributors. The valve is located on a Christmas tree; by adjusting the valve, required pressure waves are formed, and pressure codes are sent to the downhole differential pressure water distributors; and the wellhead flowmeter meters the injection flow, the downhole differential pressure water distributors receive the pressure codes and decode the pressure codes, and an adjusting instruction is obtained, so that a motor of the device is controlled according to the adjusting instruction to rotate forward or reversely to a certain open degree, the change that the open areas S of water nozzles can beadjusted is generated, and flow adjusting is conducted. The situation that the injection distribution amount of downhole layers is sent to the ground is not needed, the flows of the layers are directly read through the ground downhole flowmeter, and thus data is more reliable; in the period of water injection, the flow change brought by pressure fluctuation can be adjusted automatically, and constant-flow water injection is guaranteed; and in the later period of water injection, only the allocation process of the earlier period needs to be repeated, the error of the open areas due to corrosionand scaling can be corrected, and the aging effect of water injection is improved.

Description

technical field [0001] The invention relates to the technical field of layered water injection wells in oil fields, in particular to an intelligent water injection device and method. Background technique [0002] In recent years, the integrated technology of water injection well measurement and adjustment has been developed by leaps and bounds. The cable-type integrated measurement and adjustment technology represented by the Chinese patent ZL200910018261.5 "Concentric Integrated Measurement and Adjustment Water Injection Process Device" uses a single-core For steel wire cable operation, a centralized (flow, pressure, temperature) tester, positioning device and power system measuring and adjusting instrument is lowered into the adjustable water distribution device, and the test and deployment instructions are issued through ground control to complete the test and deployment. At the same time, the measurement and adjustment data can be displayed in real time on the ground, wh...

AI Technical Summary

Problems solved by technology

This technology needs to follow the running cable when completing the well. When the cable is connected to each water distributor, it also needs to pass through the packer. The risk of running is high and there are many weak points. The important thing is that the armored cable is expensive and is not suitable for Water injection development under current low oil price

At the same time, when the above two technical series are used underground, there are temperature drifts and errors in measurement and adjustment accuracy.

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