A high-temperature and high-pressure microscopic flow device and experimental method

Abstract

The invention discloses a high-temperature and high-pressure microscopic visual flow device and an experimental method, including a seepage simulation system, a micro-displacement and metering system connected with the seepage simulation system, and an image acquisition and analysis system; the seepage simulation system includes a visual high-temperature and high-pressure flow device Kettle, a microscopic rock core model placed in a visible high-temperature autoclave, a glass carrier arranged above and below the microscopic rock core model, the outer layer of the glass carrier is provided with a sealing rubber sleeve, and the outer layer of the visible high-temperature autoclave is provided with an annular heating jacket; The outlet end of the microscopic rock core model is provided with a microfluidic channel, which is connected to the microdisplacement and metering system through a pipeline, which effectively reduces the measurement error caused by the dead volume of the pipeline. The present invention realizes the purpose of measuring outlet fluid volume by different methods by adopting a micro-flow channel, a high-precision micro-metering pump and a high-pressure micro-valve structure at the outlet end of the microscopic rock core model, greatly improving the accuracy of the experimental device, and the overall measurement accuracy of the device up to 10nL.

Description

technical field [0001] The invention relates to the technical field of experimental devices, in particular to a high-temperature, high-pressure microscopic visualization flow device and an experimental method. Background technique [0002] The high-temperature and high-pressure microscopic flow experiment can not only intuitively and truly study the distribution, flow and occurrence of single-phase fluid in porous media under reservoir conditions, but also combine the actual reservoir geological characteristics and reservoir conditions to conduct different injection media. , Multiphase fluid seepage experiments under different development methods, to investigate the interaction mechanism between fluids under different injection media and different development methods, and the distribution characteristics of fluids during the oil displacement process; in addition, high temperature and high pressure microscopic flow experiments can also be used to study A series of other seepa...

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Problems solved by technology

[0003] However, there are many problems in the microscopic visual flow device in the prior art. For example, the Chinese patent with the publication number CN104100257A discloses a high-temperature and high-pressure microscopic visual formation seepage simulation experiment device and method. The microscopic seepage simulation technology of fluid in real rock under high pressure conditions can characterize the microscopic seepage characteristics of underground oil and gas, fluid phase state changes, and plane seepage during displacement processes such as gas injection, water injection, and polymer injection during the production of complex oil and gas reservoirs Features and oil displacement mechanism, the device uses long-focus high-power microscope and computer measurement and control technology to conduct continuous dynamic micro-visual observation of special phenomena such as fluid phase change, crystal crystallization, and solid-phase particle deposition during the seepage process, providing micro-seepage analysis for underground oil and gas reservoirs. Mechanism understanding and the prediction of dynamic reserves of oil and gas reservoirs provide the basis

However, due to the large dead volume of the device, the test error caused by it is relatively large, which cannot meet the experimental requirements;

[0004] The Chinese patent with the publication number CN109827884A discloses a real sandstone high-temperature and high-pressure visual seepage experiment device and method. The invention uses real reservoir rock slices as a model after processing, and places them in a high-temperature and high-pressure autoclave for visual seepage experiments, which can achieve Both "real" and "high-pressure" visual microscopic seepage experimental research needs, but the maximum temperature and pressure of the device can not meet the temperature and pressure conditions of some deep reservoirs, and the device has a large error in the measurement of the outlet fluid, Unable to meet experimental needs

[0005] In summary, the main problems in the design of the current visual seepage experiment devices are as follows: ① Most of the microscopic visual simulation experiment devices are mainly used at normal temperature and pressure, and cannot realize the research of reservoir fluids under reservoir conditions (high temperature, high pressure). Seepage mechanism; ②The maximum temperature and pressure of some high-temperature and high-pressure microscopic visual seepage experimental devices still cannot meet the temperature and pressure conditions of some deep reservoirs and some experimental needs for studying the reaction mechanism of fluid in porous media with crude oil under high temperature and high pressure; ③Currently The microscopic visualization simulation experiment device has a large error in the measurement of the outlet fluid, a large dead volume, and the accuracy of the experimental results is not enough

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