A dual-channel sound transmitter and its circuit suitable for oil well pressure measurement

Abstract

The invention discloses a dual-channel sound transmitter suitable for oil well pressure measurement and its circuit, including a circuit transmission part and a transmitter part. Among them, the input voltage of the circuit transmission part is ±5V~±36V voltage, and directly outputs the standard coupling echo 0‑5V voltage signal used to calculate the sound velocity and the liquid level echo 0‑5V voltage signal used to calculate the liquid level depth. It can directly perform AD conversion, realize the amplification of weak signals, and have high sensitivity. At the same time, the volume of the transmitter is reduced, which is convenient for downhole measurement and meets the monitoring conditions under more working conditions.

Description

technical field [0001] The invention belongs to the field of oil well formation pressure measurement, and relates to a dual-channel sound transmitter and a circuit suitable for oil well pressure measurement. Background technique [0002] At present, when testing the formation pressure of oil wells, storage pressure gauges are generally used for measurement. In this method, the combination of oil well pipe, rod and column needs to be driven out for each test, and the test period is long, about 15 days. The test cost is relatively high, and at the same time, the production is affected. Therefore, someone has proposed the method of using echo to test formation pressure, but the sound transmitter for testing echo is not available in the market at present, which has become a key technical problem for echo method to test formation pressure. Generally, sound sensors made through the piezoelectric effect do not have the ability to process sound signals. Software is often used to pr...

AI Technical Summary

Problems solved by technology

This method needs to start the combination of oil well pipe, rod and column for each test, the test period is long, about 15 days, the test cost is high, and the production is affected at the same time

Therefore, someone has proposed a method of using echo to test formation pressure, but there is no sound transmitter for testing echo in the market, which has become a key technical problem in testing formation pressure by echo method

Generally, sound sensors made by the piezoelectric effect do not have the ability to process sound signals. Software is often used to process sound signals, and the sensor signals are directly obtained. While obtaining useful signals, it is easy to introduce useless noise signals. Software filtering , extending the signal spectrum to an infinite range, it is easy to generate spectrum aliasing, at this time the signal spectrum is distorted, and the filter design is meaningless

This will not be conducive to the extraction of sound velocity data in the collar wave signal

At the same time, because the liquid surface wave is reflected back from the bottom hole liquid surface, the signal itself is relatively weak, and it is easy to be buried in the noise and cannot be accurately identified. Eventually, the test results cannot be analyzed and the test fails.

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