Flow-controllable high-precision crude oil moisture content measuring instrument

Abstract

The invention discloses a flow-controllable high-precision crude oil moisture content measuring instrument. The instrument comprises a cavity, a micro differential pressure sensor I, a micro differential pressure sensor II, a cyclone, an electric ball valve, a collecting pipe, a double-U-shaped bent pipe, a heater and a flow control valve. The cavity is divided into a left cavity and a right cavity by a partition plate, the cyclone is connected with the right cavity and is used for separating a gas phase in a mixed-phase liquid to be measured, the micro differential pressure sensor I is used for measuring the pressure difference of the same liquid level of the two cavities, the micro differential pressure sensor II is used for detecting whether the liquid level of the right cavity reachesa specified height or not, The double-U-shaped bent pipe is communicated with the cavity and a measuring opening of the micro differential pressure sensor II, the flow control valve is used for stabilizing the flow of crude oil to be measured, and the heater is used for heating the crude oil to be measured. The measuring instrument disclosed by the invention can control the flow of the crude oil to be measured, can heat low-temperature crude oil, can prolong the average continuous fault-free working time of the instrument, prolongs the service life of the instrument, and is more accurate in measurement result.

Description

technical field [0001] The invention belongs to the field of crude oil monitoring, and in particular relates to a flow-controllable high-precision 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 through 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. The measuring port of the micro-pressure sensor of the existing crude oil water content measuring instrument is generally di...

AI Technical Summary

Problems solved by technology

The measuring port of the micro-pressure sensor of the existing crude oil water content measuring instrument is generally directly connected to the crude oil measuring chamber or connected to the measuring chamber through a single elbow. This connection method has the following disadvantages: when the crude oil enters the measuring chamber, the crude oil The gaseous phase components in the gas will enter the top of the elbow. In a low temperature environment, the gaseous phase components are easily condensed into a liquid state, and the liquid crude oil will flow down the elbow pipe to the measurement port of the micro-pressure sensor. It is easy to block the measuring port of the micro-pressure sensor, which makes it unable to use normally. Therefore, the existing instrument needs to continuously disassemble the micro-differential pressure sensor for cleaning, which seriously reduces the service life of the instrument and shortens the average continuous trouble-free working time of the instrument.

[0004] Existing instruments for crude oil measurement are directly connected to the crude oil pipeline for measurement. Different oil wells have different flow rates and have different impacts on the measuring instruments. The liquid level in the measurement chamber fluctuates, resulting in inaccurate final measurement results, or when the oil well crude oil flow rate is uneven, it will have a certain impact on the pressure in the measuring instrument cavity. The sensitivity of the micro-pressure sensor is extremely high, and the crude oil flow rate is uneven. The resulting pressure changes will inevitably lead to errors in the measurement results, therefore, the measurement accuracy of the measuring instruments in the prior art is low

[0005] In addition, when the crude oil temperature is in the range of 30°C to 50°C, the water content of the measured crude oil is closest to the real value. No heating measures are taken in the existing instruments. When the crude oil temperature drops, it is not conducive to its water content. The measurement, measured in time, also deviates greatly from the true value

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