Instrument and method suitable for continuous monitoring of working fluid level in oil wells and natural gas wells

Abstract

The invention provides an instrument and method suitable for continuous monitoring of the working fluid level in oil wells and natural gas wells. The instrument is of an integrated structure; an electric control acoustic pulse sound producing device, a broadband acoustic wave monitoring sensor and a circuit control processing unit are integrated inside a housing of the instrument, wherein the electric control acoustic pulse sound producing device is used for producing a sound pulse signal that is transmitted to a downhole; the broadband acoustic wave monitoring sensor is used for collecting anecho signal generated during the transmission of the sound pulse signal in the downhole; the circuit control processing unit is used for filtering and amplifying the received echo signal and carryingout digital-to-analog conversion to obtain a digital signal, and processing the digital signal to obtain a working fluid level value of the oil wells and natural gas wells; the instrument can realizecontinuous monitoring of the fluid level of the oil wells and the natural gas wells under any working conditions; the measured well depth range is 200 m to 4000 m; the shortest measurement interval is 5 min; and the instrument totally meets the test requirements of a low-pressure test well in production of oil fields, can be used for replacing manual measurement, lowers the production cost, improves the real-time property of fluid level data sampling, and provides significant technological support for aspects such as geologic modeling in production of oil and gas field, intelligent productionof oil (natural gas) wells and dynamic analysis of oil reservation.

Description

technical field [0001] The invention relates to the technical field of dynamic testing of oil wells in the petroleum industry, in particular to an instrument and method suitable for continuous monitoring of fluid levels in oil wells and natural gas wells. Background technique [0002] The domestic dynamic liquid level test is mainly based on manpower. First, use the nitrogen cylinder to manually fill the air gun with a certain pressure of gas; secondly, pull the lead wire to release the compressed gas, send out a sound signal, and record the echo signal by the handheld operator; finally, the manual operator The echo signal collected and recorded by the instrument is imported into the computer, and the echo signal is processed intensively by professional technicians to obtain the dynamic fluid value. [0003] First of all, the testing staff drove production wells one by one to carry out the testing work. The road conditions at the oilfield site were poor, and there were great...

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Problems solved by technology

[0006] The purpose of the present invention is to provide an instrument suitable for continuous monitoring of dynamic liquid level in oil wells and natural gas wells, which solves the defects that the existing domestic dynamic liquid level test has potential safety hazards and cannot meet the measurement of deep wells greater than 2000m

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