Measurement method of oil-water interface

Abstract

The invention relates to a measurement method of an oil-water interface, which comprises the following steps: A, selecting a bipolar capacitance probe rod with a proper length according to the depth of an oil-water mixture to be measured and ensuring that the length of the bipolar capacitance probe rod is larger than or equal to the depth of the oil-water mixture; B, connecting the bipolar capacitance probe rod with a measurement circuit of the bipolar capacitance probe rod; C, using the bipolar capacitance probe rod to test the capacitance values of water and oil respectively; D, inserting the capacitance probe rod into the oil-water mixture to be measured to measure the capacitance value of the capacitance probe rod; and E, calculating the depth of the oil-water interface in the oil-water mixture to be measured through the following formula: Li=CmixKh / (Cw-Co), wherein Li is the depth of the oil-water interface, Cmix is the capacitance value of the oil-water mixture, Cw is the capacitance value of water, Co is capacitance value of oil, and Lh is the total depth of the oil-water mixture.

Description

technical field [0001] The invention relates to a method for measuring the oil-water interface in an oil-water mixed medium storage tank, in particular to a method for measuring the oil-water interface by using a capacitor. Background technique [0002] In the petroleum industry, determining the oil-water interface is a problem often encountered in the process of crude oil separation and storage. Due to the lack of stable and effective measurement methods, manual fishing is still used in the large settling tanks of the joint station. Samples are used to detect the oil-water interface to estimate oil storage. Although a variety of measurement methods have been developed for decades, there are various problems, and none of them can finally solve the problem of accurate measurement of the oil-water interface. [0003] So far, the methods for measuring the interface between oil and water include: resistance, capacitance switch method; radio frequency admittance method, ray meth...

AI Technical Summary

Problems solved by technology

The disadvantage of the resistance and capacitance switching method is that it cannot perform continuous measurement, and is generally only used as a liquid level switch.

The disadvantage of the radio frequency admittance method is that the measurement error is large

The ray method is harmful because it uses radioactive substances for measurement, especially it will cause damage to the health of the on-site workers, so it is not popular

Floating balls are currently used in many applications. After the volume and mass are adjusted, there is a certain measurement accuracy. However, after a period of use, the fouling on the measuring slider is easy to block the floating ball, so it is necessary to clean the measuring slider frequently to ensure measurement accuracy

[0004] Due to the limitation of technical difficulty, the existing interface measurement technology and products have not fully met the needs of the petroleum industry so far. It is our goal to develop a practical capacitive oil-water interface measurement technology to meet the needs of the petroleum industry.