An x-ray CT measurement system for air-water relative permeability

Abstract

The invention provides an X-ray CT (Computed Tomography) measurement system for gas-water relative permeability, and belongs to the technical field of CO2 capture and storage. The X-ray CT measurement system comprises a sand filling pipe, a saline water / CO2 injection system, an X-ray CT imaging system, a computer data acquisition system, a liquid conveying system, a temperature control system, a vacuum pipe and a back pressure valve. A main body of the sand filling pipe is in an aluminum alloy structure so as to enhance the penetration of X-ray; upper and lower flange discs of a core barrel are in stainless steel structures and can be detached freely. The upper and lower flange discs are provided with dense stainless steel wire meshes so as to prevent sand from flowing into an experiment device. Sealing rings are arranged at the butt-joint parts of the upper and lower flange discs and the main body of the sand filling pipe and are used for sealing the sand filling pipe and the experiment device. According to the X-ray CT measurement system, the saturation level and the relative permeability of each phase of two-phase flows of CO2 and saline water in a porous medium can be measured efficiently and reliably; the interference problems of various influence factors in a measurement process of the saturation level and the relative permeability of the two phases including the CO2 and the saline water are solved.

Description

technical field [0001] The invention relates to a peripheral component of an X-rayCT imager, and relates to an X-rayCT measurement system for gas-water relative permeability. Background technique [0002] Since the industrial revolution, humans have burned a large amount of fossil fuels and emitted CO2 into the atmosphere, which has led to an increase in the content of CO2 in the atmosphere year by year. The greenhouse effect of CO2 has caused climate change on a global scale. CO2 capture and storage (CCS) plays an important role in reducing greenhouse gas emissions. Using X-rayCT to measure the distribution of CO2 saturation inside the sand-filled core tube is currently a brand-new technology. However, in the field of petroleum engineering, X-rayCT has begun to be used in the research of porous media, well logging, etc. X-rayCT logging is not affected by reservoir rock and reservoir rock composition, and it can provide the amount of fluid in rock pores , fluid properties...

AI Technical Summary

Problems solved by technology

It provides a reliable and efficient test system for the measurement of each phase saturation and relative permeability of CO2 and brine two-phase flow in porous media, and solves various problems in the measurement process of CO2 and brine two-phase saturation and relative permeability. The interference of influencing factors, as well as the analysis of the influencing factors and influencing mechanism on the two-phase saturation and relative permeability of CO2 and brine, lay a theoretical basis for various CO2 capture and storage technologies

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