Wireless layered water injection method for monitoring downhole flow, pressure and temperature

Abstract

The invention discloses a wireless layered water injection method for monitoring downhole flow, pressure and temperature. The method comprises the steps that a sound wave emitter sends injection allocation amount adjusting sound wave signals, after a sound wave water injection working barrel receives the signals, the layer position is judged, data are analyzed, and a water nozzle is adjusted to an injection allocation value; the sound wave emitter sends flow, pressure and temperature monitoring sound wave signals, and after coding, coding information comprises layer position information, numerical value types, numerical value weights and numerical value sizes; the sound wave water injection working barrel receives the sound wave signals and then decodes the sound wave signals, the numerical value types and the numerical value weights are determined, the sound wave emitter sequentially sends 0 to 9, and the numerical values are compared with numerical values recorded by the downhole sound wave water injection working barrel; and if the two numerical values are equal, the numerical value types and numbers on the numerical value weights are judged, the steps are repeated till hundred-digit, ten-digit and unit-digit numbers of the numerical value types obtained through decoding are determined, and transmission of the flow value, the pressure value and the temperature value of a downhole water injection layer to be monitored is completed.

Description

technical field [0001] The invention relates to a layered water injection process for oil field water injection wells, in particular to a wireless layered water injection method for downhole flow, pressure and temperature monitoring. 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 in cost. In addition, limited by the diameter of the wellbore, the...

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Problems solved by technology

[0003] The purpose of the present invention is to provide a wireless layered water injection system for downhole flow, pressure and temperature monitoring in order to solve the existing layered water injection technology that is greatly affected by well deviation and wellbore diameter and cannot realize two-way communication between the surface and the downhole. Water injection method, not affected by well deviation and wellbore diameter, can realize two-way communication between surface and downhole, easy to operate, cost-effective

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