The invention relates to a method for measuring area changes of CO2-saline water interfaces in a porous medium by using a CT The method comprises the steps of firstly preparing saline water containing potassium iodide to strengthen the image contrast of CO2-saline water; continuously scanning by using the CT to obtain unsteady-state porous medium images under the CO2-saturated condition and different injection conditions; removing a noisy point by using a filter and carrying out threshold processing to generate binary images only containing 0 and 1 of saturated CO2 and under different injection conditions; carrying out subtraction on two image stacks to obtain distribution areas of the saline water in the binary images; extracting the edges of the distribution areas of the CO2 and the saline water and determining a union set to generate binary image slice stacks of the CO2-saline water interfaces; obtaining the area changes of the CO2-saline water interface in the porous medium under different injection conditions through determining and measuring the area of disconnected CO2-saline water interfaces; and calculating the saturability of the saline water in each image slice stack and obtaining area change characteristic parameters of the CO2-saline water interfaces under different injection conditions through induction

Method for measuring area changes of CO2-saline water interfaces in porous medium by using CT

The invention belongs to the technical field of geotechnical engineering and discloses a CT image-based hydrate sediment shear zone identification method. The method comprises the following steps: acquiring a longitudinal CT scanning profile map of hydrate sediment samples under different axial strains by virtue of an X-ray CT system and a low-temperature high-pressure hydrate triaxial apparatus;separating hydrates, gases, water and the like from sediment particles by adopting an image threshold segmentation technology, and performing binarization processing; performing long-axis dip angle statistics on each local part of the binarization images of the separated sediment particles, and determining the change of the dip angle of the particles along with the rotating direction of the axialstrains, wherein a transitional zone between a part in which the images generally rotate clockwise and a part in which the images generally rotate anticlockwise is the shear zone. According to the method, the position, thickness and dip angle of the shear zone can be measured. The method is high in identification precision of the hydrate sediment shear zone and capable of obtaining the morphologicchange characteristics of the shear zone inside the samples, and has great significance for researching reservoir instability in the hydrate mining process.

CT image-based hydrate sediment shear zone identification method

The invention belongs to the technical field of multiphase-fluid flow measurement, and relates to a method for calculating a CO2 brine dispersion coefficient by combining CT and PVT The method is used for dynamically measuring an interface change during a CO2-brine mass transfer process, and quantitatively describing a CO2-salt mass transfer change rule under different temperature and pressure conditions CT is applied to acquire a continuous change CO2-brine interface image, two-phase volume and a pressure dynamic change process are observed in real time, a concentration curve is calculatedbased on a CT gray value, and the dispersion coefficient is calculated by combining a Fick law The limitation that an original PVT method cannot directly measure a brine volume dynamic change is broken An error brought by the ignorance of the volume change during a dispersion coefficient calculation process is avoided The shortage of the accuracy in calculating the dispersion system by relyingsolely on a PVT or CT method is recovered A mass transfer theory system is completed

Method for calculating CO2 brine dispersion coefficient by combining CT and PVT

The invention disclosesa method for distinguishing an aquo-complex phase from a water phase through CT scanning, and belongs to the technical field of chemical engineering and petrol engineering. The method for distinguishing the aquo-complex phase from the water phase with the CT technology includes the steps that gray level distribution generated before an aquo-complex is generated in a container is obtained with the imaging technology, gray level distribution generated after the aquo-complex is generated in the container is obtained, the area of the generated aquo-complex is obtained, and therefore the aquo-complex phase and the water phase are distinguished; finally, the decomposition process of the aquo-complex is quantitatively obtained through a formula. By means of the method, the area of the generated aquo-complex can be accurately determined, the position of the aquo-complex and the position of water are visibly determined accordingly, and the distinguishing effect is quite good accordingly; in addition, changes of the saturation degree in the decomposition process of the aquo-complex are calculated, and therefore the decomposition process of the aquo-complex is quantitatively analyzed.

Method for distinguishing aquo-complex phase from water phase through CT scanning

The invention discloses a method for quickly measuring a gas-liquid diffusion coefficient by virtue of a magnetic resonance imaging technology, which belongs to the field of physical simulation detection of oil reservoirs. The method for quickly measuring the gas-liquid diffusion coefficient by virtue of the magnetic resonance imaging technology comprises the following steps: firstly, acquiring the liquid phase concentration distribution of each position in an imaging area along the diffusion direction by virtue of an imaging technology; secondly, acquiring the concentration difference of each position between a reference moment and a calculation moment; finally, performing nonlinear fitting by virtue of a formula to obtain the gas-liquid diffusion coefficient. According to the method, the gas-liquid diffusion coefficient value can be accurately determined; by virtue of the concentration difference between the previous and subsequent moments, the influence caused by interfacial concentration change in an experiment is eliminated, and the applicability is wide; moreover, the calculation time is the time of diffusion from a gas phase to the bottom of a liquid phase and is greatly shorter than the time of finally reaching balanced concentration required by most of experiments.

Method for quickly measuring gas-liquid diffusion coefficient by virtue of magnetic resonance imaging technology

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Method for distinguishing aquo-complex phase from water phase through CT scanning

Method for quickly measuring gas-liquid diffusion coefficient by virtue of magnetic resonance imaging technology