High-temperature and high-pressure microscopic visual flowing device and experimental method

Abstract

The invention discloses a high-temperature high-pressure microscopic visual flowing device and an experimental method. The high-temperature high-pressure microscopic visual flowing device comprises a seepage simulation system, a micro displacement and metering system connected with the seepage simulation system, and an image acquisition and analysis system, wherein the seepage simulation system comprises a visible high-temperature and high-pressure kettle, a microscopic rock core model placed in the visible high-temperature and high-pressure kettle, and glass carriers arranged above and below the microscopic rock core model, a sealing rubber sleeve is sleeved outside the glass carriers, and an annular heating sleeve is sleeved outside the visible high-temperature and high-pressure kettle; a microfluidic channel is arranged at the outlet end of the microscopic rock core model and connected with a micro displacement and metering system through a pipeline, and metering errors caused by the dead volume of the pipeline are effectively reduced. The device is advantaged in that a microfluidic channel, a high-precision micro-metering pump and a high-pressure micro-valve structure are adopted at the outlet end of the microscopic rock core model, so a purpose of metering the volume of fluid at the outlet by different methods is achieved, precision of the experimental device is greatly improved, and overall metering precision of the device reaches 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 e

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