气—水、油—水界面张力及砂岩润湿特性实验研究
[Abstract]:For a long time, the energy structure of our country is dominated by coal, there are contradictions between supply and demand of oil, and the domestic oil output needs to be improved. At the same time, the problem of CO2 Greenhouse Effect produced by burning fossil energy in industrial production has attracted more and more attention. Using CO2 to improve the oil production rate and effectively store the industrial emissions of CO2 is an effective measure to deal with these energy and environmental problems. By injecting the captured CO2 into a low-yield oil field to improve oil recovery or into an underground salt water layer, It can directly and effectively achieve the aim of greenhouse gas emission reduction. CO2 injection into the formation is accompanied by the flow of two-phase or multi-phase fluids in rock pores. The interaction between fluids in reservoirs and between rocks and fluids affects the distribution of fluids in rock pores and the direction and size of capillary forces, thus affecting the percolation characteristics of fluids in rock cores. In order to predict the CO2 ability of salt water reservoir, it is necessary to measure the reservoir temperature, interfluid interfacial tension under pressure and the wetting characteristics of rock surface. Therefore, the experimental study of interfacial tension (IFT) and wetting characteristics of rocks under reservoir conditions can provide a very important data basis for improving oil recovery and long-term safe storage of CO2. Under the background of improving oil recovery and CO2 geological seal, this paper has carried out the following research: the interfacial tension between CO2- brine and oil-water was measured by axisymmetric drop shape analysis, and the interfacial tension, temperature and pressure were analyzed in detail. The relationship between salt water concentration and the experimental temperature and pressure range is obtained, which provides a reference for predicting the interfacial tension of CO2- brine at a certain concentration in the range of experimental temperature and pressure. The contact angles of salt water with Berea cores in gaseous, liquid and supercritical CO2 atmosphere were measured by drop method. The effects of temperature, pressure, composition and CO2 phase state on the wetting characteristics of cores were studied. The experimental results show that the interfacial tension between oil and water is not significantly affected by pressure and increases with the increase of temperature, while the interfacial tension of CO2- brine increases with the increase of temperature and concentration of brine, and decreases with the increase of pressure. Moreover, the saltwater concentration increases linearly. On the other hand, due to the difference of surface roughness and composition, the contact angle of different Berea cores varies with temperature and pressure. However, the core changes from hydrophilicity to non-hydrophilicity in supercritical CO2 atmosphere. Then, the maximum sphere algorithm is used to process the Berea core image obtained by CT scan, and the pore network model of the core is obtained. Using the experimental data of interfacial tension and contact angle as input parameters of porous network two-phase seepage model, the oil-water, gas-water two-phase seepage process in sandstone is simulated, and the relative permeability and capillary pressure curves are obtained. It is in good agreement with the experimental results in previous literatures. It is proved that the pore network model can be used not only to predict the oil-water two-phase seepage characteristics, but also to study the percolation characteristics of CO2- brine, and to provide technical guidance for predicting the ability of storing CO2 in salt water layers in the future. The simulation results show that the supercritical state CO2 can obtain a larger storage capacity in the salt water layer.
【学位授予单位】:大连理工大学
【学位级别】:硕士
【学位授予年份】:2015
【分类号】:TE31
【共引文献】
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