Test method and device of working fluid level of oil well

Abstract

The invention discloses a test method and device of a working fluid level of an oil well. The test method comprises the following steps: obtaining volume flow rate, temperature and pressure of injected gas and self-produced gas of the oil well under a standard state, temperature and pressure of mixed gas in the oil well, and size of an oil sleeve of the oil well through test; analyzing gas components to obtain molecular weight of the injected gas, the self-produced gas of the oil well and the mixed gas in the oil well; obtaining mass flow rate of the injected gas and the self-produced gas of the oil well under the standard state according to the volume flow rate, the temperature, the pressure and the molecular weight of the injected gas and the self-produced gas of the oil well under the standard state; obtaining volume of the mixed gas in the oil well under the standard sate according to the mass flow rate of the injected gas and the self-produced gas of the oil well under the standard state as well as the temperature, the pressure and the molecular weight of the mixed gas in the oil well under the standard state; and obtaining depth of the working fluid level of the oil well according to the volume of the mixed gas in the oil well under the standard state and the size of the oil sleeve of the oil well. By utilizing the method and the device, the test accuracy of the working fluid level of the oil well can be improved, thus being particularly applicable to a production well with higher gas-oil ratio or a heavy oil production well.

Description

Technical field [0001] The present invention relates to the technical field of petroleum exploitation, in particular to a method and device for testing the fluid level of an oil well. Background technique [0002] In oil field exploitation, oil well fluid level data is an important oil well management basic data, which directly reflects the oil well’s fluid supply capacity. The conventional method of oil well dynamic liquid level testing is the echo method. This method uses the explosive sound of ammunition bombs or high-pressure gas cylinders as the sound source at the wellhead, and the generated vibration waves propagate down the annular space in the tubing and casing, and meet the liquid level. Generate reflected waves, use the wellhead microphone to receive the reflected waves and calculate the depth of the liquid surface. The method is simple in process and convenient to implement. However, in the production wells with relatively high gas oil or heavy oil, due to the influe...

AI Technical Summary

Problems solved by technology

This method is an indirect method for testing the dynamic liquid level, which has the advantages of high test accuracy and low cost. However, this method is still unable to achieve the test for heavy oil wells with long pressure recovery period, low gas production or no gas production. Purpose

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