High-precision spiral-flow type crude oil moisture content measuring instrument

Abstract

The invention discloses a high-precision spiral-flow type crude oil moisture content measuring instrument, which comprises a cavity, an inlet pipe, a cyclone, an outlet pipe, a micro differential pressure sensor I and a micro differential pressure sensor II, wherein the cavity is divided into a left chamber and a right chamber by a partition plate, contrast liquid is injected into the left chamber, and crude oil mixed-phase liquid to be measured is injected into the right chamber; the inlet pipe and the outlet pipe are communicated with the upper end and the lower end of the right chamber respectively, the cyclone is connected with the right chamber and used for separating a gas phase in the to-be-measured mixed-phase liquid, the micro differential pressure sensor I is used for detecting that the liquid level of the right chamber reaches the designated height, and the micro differential pressure sensor II is used for measuring the pressure difference of the same liquid level of the twochambers. The high-precision spiral-flow type crude oil moisture content measuring instrument disclosed by the invention can be used for effectively separating a gas phase in crude oil, can be directly connected into a crude oil pipeline for use, is convenient to measure and high in efficiency, realizes high-precision measurement at lower measurement cost, and prolongs the average continuous fault-free working time of the instrument as a measuring port of the instrument is not in direct contact with the crude oil.

Description

technical field [0001] The invention belongs to the field of crude oil monitoring, and in particular relates to a high-precision swirl type crude oil water content measuring instrument. Background technique [0002] In the process of crude oil extraction, the ratio of oil and water is an important parameter to characterize oilfield reservoirs, and it is also an important basis for formulating and adjusting oilfield production plans and optimizing production parameters. Is of great significance. [0003] The existing crude oil water content measuring instrument mainly measures the pressure difference between the crude oil and the reference liquid at the same liquid level by a micro-pressure sensor, and then calculates the crude oil water content according to the measured pressure difference, combined with the density of water and crude oil. Due to the existence of multi-phase gas phase in crude oil, the crude oil to be tested is mostly oil, gas, and water mixed-phase fluid. ...

AI Technical Summary

Problems solved by technology

Due to the existence of multi-phase gas phase in crude oil, the crude oil to be tested is mostly oil, gas, and water mixed-phase fluid. When measuring, the gas-liquid separation of the mixed-phase fluid must be carried out. Therefore, the above-mentioned instruments need to be equipped with a gas-liquid two-phase separation device at the front end of the measurement. However, due to the large size of the separation device and the high requirements for installation space, the installation and commissioning of the entire measurement system is complicated, the transportation is troublesome, and the manufacturing and use costs are extremely high. The gas is exported from the bypass pipeline, but when the flow rate of crude oil is fast and there is a lot of gas, the gas-liquid separation effect of this passive separation method is not ideal

[0004] In addition, the measuring port of the micro-pressure sensor in the above-mentioned instrument for measuring the water content of crude oil is directly immersed in the crude oil. It cannot be used normally, and the micro differential pressure sensor needs to be continuously disassembled for cleaning, which seriously reduces the service life of the instrument

The sensitivity of the micro-pressure sensor is extremely high. The existing instrument needs to keep the liquid level of crude oil still during measurement. During the measurement, the liquid inlet and outlet valves of the test chamber must be closed at the same time. The measurement can only be carried out when the liquid level is still. Therefore, the current Some instruments are basically unable to measure the continuously flowing crude oil

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