Cable-free layered water injection method that enables downhole flow, pressure and temperature monitoring

Abstract

The invention discloses a cableless layering water injection method capable of achieving downhole flow, pressure and temperature monitoring. The method comprises the steps that a sound wave launcher sends an injection allocation rate adjustment sound wave signal, and a sound wave water injection working barrel receives the injection allocation rate adjustment sound wave signal, judges a layer, analyzes data and adjusts a water nozzle to an injection allocation value; the sound wave launcher sends a flow, pressure and temperature monitoring sound wave signal, and coding is conducted, wherein code information comprises layer information, value types, value weights and value sizes; the sound wave water injection working barrel receives the sound wave signal and then conducts decoding, the value types and the value weights are determined, the sound wave launcher sequentially sends zero to nine, the sent number is compared with the value recorded by the downhole sound wave water injection working barrel, the two values are equal, the value types and numbers on the value weights are judged, the above-mentioned steps are conducted repeatedly till the hundreds digit, the tens digit and the single digit of the value types obtained through decoding are obtained, and transmission of the flow value, the pressure value and the temperature value of a downhole water injection layer to be monitored is completed. By means of the cableless layering water injection method capable of achieving downhole flow, pressure and temperature monitoring, ground and downhole two-way communication can be achieved.

Description

technical field [0001] The invention relates to a layered water injection process for oilfield water injection wells, and more specifically relates to a cable-free layered water injection method that can monitor downhole flow, pressure and temperature parameters by using acoustic wave communication. Background technique [0002] Water injection is an effective means to enhance oil recovery and maintain high and stable production in oilfield development. At present, the methods of downhole layered water injection mainly include: mechanical throwing and pulling type layered water injection method and cable remote control type layered water injection method. The mechanical throwing and fishing layered water injection method is greatly affected by the well deviation, so it cannot be applied in highly deviated wells and horizontal wells. However, the cable remote-controlled layered water injection method needs to run the cable underground, which is complex in operation and high ...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the problem that the two-way communication between the surface and the downhole cannot be realized due to the influence of the well deviation and the diameter of the wellbore existing in the existing layered water injection technology, and to provide a cableless The method of layered water injection is not affected by well deviation and wellbore diameter, and can realize two-way communication between the surface and the downhole, which is easy to operate and cost-effective

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