An application of CT to measure CO in porous media 2 Method of dissolution rate in brine
A technology of porous media and dissolution rate, applied in image analysis, image enhancement, instruments, etc., can solve problems such as reducing the average value of dissolution rate, and achieve the effect of improving prediction accuracy, eliminating systematic errors, and improving the theoretical system of mass transfer and seepage.
Active Publication Date: 2019-12-27
DALIAN UNIV OF TECH
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When the two phases reach a phase equilibrium state, part of the phase interface will follow the CO 2 The air bubbles completely dissolve in the brine and disappear, thereby reducing the average dissolution rate in this area
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[0032] The specific embodiments of the present invention will be described in detail below in conjunction with the technical solutions and accompanying drawings.
[0033] The example is under the conditions of 40°C and 8MPa, using CT to measure the CO in porous media under different injection conditions. 2 Dissolution rate in brine.
[0034] The first step is to continuously scan with CT to obtain unsteady images inside the reactor under different injection conditions;
[0035] Set the temperature and pressure at 40°C and 8MPa; before injecting brine, inject CO into the reactor filled with porous media 2 To the saturated state; then set the brine injection flow rate and direction as 0.02ml / min upward injection and 0.01ml / min downward injection, continuously inject brine into the high-pressure vessel, and use CT continuous scanning to obtain non-toxic The images in the reactor in a steady state are stacked in layers until the scanning stops when a steady state is reached. Ob...
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The invention belongs to the technical field of polyphase fluid flowing measurement in porous mediums, and discloses a method of using CT to measure the dissolution rate of CO2 in porous mediums in saline water. The method of using CT to measure the dissolution rate of CO2 in porous mediums in saline water is characterized by using CT to obtain the images in a continuously changed reaction still,extracting the image area corresponding to saline water, obtaining the volume content rate difference value and the gray value difference value of the saline water through measurement, so as to calculate and obtain distribution and the average value of the dissolution rate of CO2 at different time in the porous mediums under different injection conditions in the saline water in the injection direction, thus improving the practical application value and prediction precision of the dissolution rate and eliminating the potential source of the system error related with the method, and by continuously shooting the dissolution process of CO2 in the saline water under different injection conditions, exploring various influence of different factors on the dissolution rate of CO2 in the saline water, and completing the dissolution and seepage theory system.
Description
technical field [0001] The invention belongs to the technical field of multiphase fluid flow measurement in porous media, and relates to a method for measuring CO in porous media using CT. 2 Dissolution rate method in saline. Background technique [0002] As a new green technology, carbon dioxide storage technology can significantly reduce the greenhouse gas effect caused by industrial emissions, so it has been extensively studied in recent years. Due to the presence of a large amount of unsaturated CO in the reservoir rock structure 2 of brine, the CO 2 CO after injection into the geological reservoir 2 will gradually dissolve in unsaturated brine, eventually forming saturated CO 2 brine and reacts with the reservoir rock. Dissolution capture mechanism converts free CO 2 Converted to formation fluids, preventing CO 2 Leakage through defects such as caprock cracks can achieve stable and safe CO2 over a ten-year time scale 2 archive. [0003] CO 2 The migration of t...
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IPC IPC(8): G06T7/00G06T7/11G06T7/136
CPCG06T7/0004G06T7/11G06T7/136G06T2207/10081G06T2207/30108
Inventor 宋永臣蒋兰兰武博浩刘瑜张毅滕莹吕鹏飞王大勇
Owner DALIAN UNIV OF TECH