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Three-phase separation device, metering system and metering method

A three-phase separation and metering system technology, applied in the field of three-phase separation devices, can solve the problems of output fluid metering errors, influence of core flow test results, and inapplicability of three-phase metering devices.

Active Publication Date: 2021-10-12
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Neither of these two methods can meet the experimental requirements of oil-gas-water three-phase metering under high temperature and high pressure conditions.
[0003]In the process of measuring the volume of the oil phase, the existing three-phase metering device requires that the density of the oil phase cannot change, otherwise there will be errors in the metering of the produced fluid; In addition, there is a serious hysteresis phenomenon in the measurement of oil and water, which has a serious impact on the test results of the core flow experiment.
Under the condition of high temperature and high pressure, the physical properties of crude oil will change significantly with the injection of gas (CO2, N2, hydrocarbon gas, etc.). The existing three-phase metering device cannot be applied under the conditions

Method used

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  • Three-phase separation device, metering system and metering method

Examples

Experimental program
Comparison scheme
Effect test

application example 1

[0062] Gas drive test process:

[0063] Confirm that the displacement medium is gas phase medium. Close valves 11, 12, 13 and 14, open valve 15, inject formation water into the metering pipe through the injection pipe 35 to position E, then inject degassed crude oil into the metering pipe to position D, and finally inject high-pressure gas, while gradually increasing Pressurize the intermediate container 5 and the pressure of the back pressure valve 6 to the test pressure, and close the valve 15 after stopping gas injection.

[0064] At the beginning of displacement, the displacement product is connected to the three-phase pipe 36 through the valve 11, so that the displacement product flows into the three-phase separation device 3, and the oil-water interface and the oil-gas interface undergo dynamic changes under the action of gravity separation. , the liquid level of the visualization part also changes accordingly, and the exhaust pipe 37 and the gas flow meter 9 are opened...

application example 2

[0067] Water flooding test process:

[0068] Confirm that the displacement medium is the water phase medium. Close valves 11 and 12, open valve 15, inject formation water into the metering pipe through the injection pipe 35 to position E, then inject degassed crude oil into the metering pipe to position D, close valves 16 and 17, inject high-pressure gas, and gradually Increase the pressure of the pressurized intermediate container 5 and the back pressure valve 6 to the test pressure, and close the valve 15 after stopping gas injection.

[0069] At the beginning of displacement, the displacement product is connected to the three-phase pipe 36 through the valve 11, so that the displacement product flows into the three-phase separation device 3, and the oil-water interface and the oil-gas interface undergo dynamic changes under the action of gravity separation. , the liquid level of the visualization part also changes accordingly, and the drain pipe 37 and the liquid measuring ...

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Abstract

The invention discloses a three-phase separation device, a metering system and a metering method. The device may comprise: a cavity having a window on the front side; a metering pipe is arranged in the cavity and comprises a visible pipe and an invisible pipe, the upper parts, the middle parts and the lower parts of the visible pipe and the invisible pipe are respectively communicated through pipelines, and outlets at the upper ends and the lower ends of the visible pipe and the invisible pipe are respectively arranged outside the upper end and the lower end of the cavity; an injection pipe is arranged at the upper part in the cavity and communicated with the metering pipe, and an inlet of the injection pipe is arranged outside the side surface of the cavity; a three-phase pipe is arranged on the lower portion in the cavity and communicated with the metering pipe, and an inlet of the three-phase pipe is formed in the outer portion of the side face of the cavity. An exhaust pipe comprises an exhaust pipe and a drainage pipe, the exhaust pipe is connected with an upper end outlet of the metering pipe, and the drainage pipe is connected with a lower end outlet of the metering pipe. Under the action of gravitational differentiation, water, oil and gas three-phase media are different in density, three-phase medium separation is achieved, and oil-gas-water three-phase separation metering under different temperature and pressure conditions can be accurately and visually achieved in real time.

Description

technical field [0001] The invention relates to the field of petroleum development experiments, and more specifically, to a three-phase separation device, a metering system and a metering method. Background technique [0002] With the popularization and application of gas flooding technology in tertiary oil recovery, indoor mechanism research is an essential and important research content, and core gas flooding flow experiment is one of the routine evaluation contents. The gas drive flow experiment is carried out under the experimental conditions of high temperature and high pressure, and the produced fluid (simulated formation water displaced from the core, simulated formation oil, and gas breakthrough from gas injection) has a certain pressure, which increases the oil, gas and water pressure. The difficulty of three-phase separation measurement. At present, there are mainly two methods for the measurement of fluid at the production end, one is the separation and measureme...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D17/025B01D17/12B01D19/00G01F22/00
CPCB01D17/0208B01D17/12B01D19/0073G01F22/00
Inventor 伦增珉崔茂蕾唐永强吕成远王锐王海涛赵春鹏肖朴夫
Owner CHINA PETROLEUM & CHEM CORP