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 invention relates to the technical field of petroleum exploitation, in particular to a method and a device for testing the fluid level of an oil well. Background technique [0002] In oil field production, the dynamic liquid level data of oil well is an important basic data of oil well management, which directly reflects the liquid supply capacity of oil well. The conventional method for oil well dynamic liquid level testing is the echo method. This method is to use the explosion of ammunition or high-pressure gas cylinders as the sound source at the wellhead. Generate reflected waves, use the wellhead microphone to receive the reflected waves and calculate the depth of the liquid surface. This method is simple in process and easy to implement, but in wells with high gas-oil ratio or heavy oil production, due to the influence of "foam section" or "dead oil block" existing in the annulus of oil casing, the error of the obtained test results is very...

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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