Downhole flow metering device and method for layered water injection well

Abstract

The invention provides a downhole flow metering device and method for a layered water injection well. A valve of the device is located is located on a Christmas tree; by adjusting the valve, requiredpressure waves are formed, and pressure codes are sent to downhole differential pressure water distributors; a pressure meter meters wellhead pressure data, a flowmeter meters the injection flow, thedownhole differential pressure water distributors receive pressure codes and decode the pressure codes, and an adjusting instruction is obtained, so that a motor of the device is controlled accordingto the adjusting instruction to rotate forward or reversely to a certain open degree, the change that the open areas S of water nozzles can be adjusted is generated, and flow adjusting is conducted; and a ground data processing device receives injection flow data and the pressure data during allocation, the change of the injection flow is collected in real time according to the pressure change, and thus a pressure and flow relation cloud atlas of the layer is formed. According to the downhole flow metering device and method for a layered water injection well, the injection amount of each layercan be obtained precisely without downwards-putting of a cable instrument; and the collecting frequency can be adjusted according to the flow change, and the working efficiency and flow recording accuracy are improved.

Description

technical field [0001] The invention relates to the technical field of layered water injection wells in oil fields, in particular to a downhole flow metering device and method for layered water injection wells. Background technique [0002] As the oilfield enters the late stage of high water cut development, the contradictions between layers and layers are prominent, and layered water injection, as the main technical means of water injection, has always played a decisive role. Fine layered water injection puts forward higher requirements for the layered water injection process, which requires separation, injection and accurate injection at the same time. The cable-type integrated measurement and adjustment technology represented by the Chinese patent ZL200910018261.5 "Concentric Integrated Measurement and Adjustment Water Injection Process Device" is affected by the well deviation and the scaling is large. When the well deviation exceeds 50° or the scaling is serious , It i...

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Problems solved by technology

[0004] (1) The test takes a long time. In order to improve the test accuracy, the interval between the test requirements is 24 hours, which is also not suitable for the current demand for a large test workload;

[0005] (2) Since the flow rate collected by the measuring and adjusting instrument is a discontinuous discrete signal, when drawing the water injection and water absorption curve, it is manifested as signal distortion during the continuous water injection process, which affects the prediction of the flow rate of each layer in the downhole, to a certain extent It affects the development effect of water drive reservoir

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