Method for measuring dynamic liquid surface of oil well with frequency difference infrasonic wave generator

Abstract

Provided is a method for measuring the dynamic liquid surface of an oil well with a frequency difference infrasonic wave generator. The method for measuring the dynamic liquid surface of the oil well with the frequency difference infrasonic wave generator comprises the following steps of (1) pre-installing echo machines at the inner side of each casing coupling and the outer side of each tubing coupling respectively; (2) installing the frequency difference infrasonic wave generator above the mouth of the oil well, and enabling the frequency difference infrasonic wave generator to be connected to a control unit which is connected with a microphone at the mouth of the oil well and an upper computer and an oscilloscope at a remote end respectively; (3) sending a signal to the control unit through the upper computer, transmitting a generated infrasonic wave to the downhole, then receiving reflected waves returned by a downhole echo machine and the dynamic liquid surface through the microphone at the mouth of the oil well, and then converting the reflected waves into electric signals so as to display the electric signals on the oscilloscope; (4) transmitting the electric signals to an AD sampling chip, obtaining the height of the dynamic liquid surface through calculation with the chip, and sending results to the upper computer. The method for measuring the dynamic liquid surface of the oil well with the frequency difference infrasonic wave generator has the advantages of being high in safety, low in operation cost and construction intensity, controllable in process, small in measurement error and capable of achieving real-time, continuous, remote and unmanned monitoring of the dynamic liquid surface of the oil well.

Description

technical field [0001] The invention relates to the technical field of oil and gas field development, in particular to a method for measuring the dynamic liquid level of an oil well with a frequency difference type infrasonic wave generator. Background technique [0002] In the process of oil field production, the dynamic liquid level indicates the height of the annular liquid level between the tubing and casing of the pumping well from the bottom of the well. It is usually used to judge the level of formation pressure and is a key indicator reflecting the formation's liquid supply capacity. It is an important basis for determining a reasonable sinking degree and formulating a reasonable working system. At present, the methods of measuring the dynamic liquid level include pressure sensor testing, emptying shells, and pneumatic sound source testing. Due to the problems of complicated operation, relatively poor safety and reliability in pressure sensor testing and emptying she...

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Problems solved by technology

At present, the methods of measuring the dynamic liquid level include pressure sensor testing, emptying shells, and pneumatic sound source testing. Due to the problems of complicated operation, relatively poor safety and reliability in pressure sensor testing and emptying shells, pneumatic sound sources are rarely used. It is the most widely used measurement method at present. Using the principle of sound waves, it is mainly divided into two types: sound wave type and infrasonic type. Although it has the characteristics of stable signal strength, low attenuation, and long-distance transmission, the application of infrasonic wave generators is limited due to various problems. For example,

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