| Based on the research of foam flooding in the GD,CQ and HJ blocks of SL oil field with low salinity CaCl2 water type,high temperature and low permeability,this paper carried out a research on foam from static properties in continuous space to complex dynamic performance in porous media.Aiming at the characteristics of the target block reservoir,the solubility of 16common surfactants was tested,and then the foaming ability and stability in the continuous space.The best economical and suitable concentration was screened out in two aspects.The superior performance of the foaming agent system provides a basis for further study of the properties of the foam in porous media.The original resistivity test technique was improved in this paper,overcoming the instability of the evaluation curve,the non-pressure resistance of the device and other technical limitations.With the improved testing system,influence of porosity,blowing agent concentration,salinity,temperature and Pressure on the foam properties in porous media were evaluated.The appropriate conditions to enhance the performance of the foam were found out..The dynamic foaming ability of the foaming agent solution in the porous medium is measured by the slugging of the foaming agent and the nitrogen gas into the short core,and the dynamic injection conditions for enhancing the foaming performance are preferred.?0.3%LAO+0.5%OA-12?,Z-12 and?0.3%LAO+0.5%AES?,which showed excellent foaming ability in continuous space,were dynamically injected through short core and comparison of the results were made.It was proved that the ability of foam migration and regeneration plays an important role in the foaming ability of porous media,as well as the importance of foam capacity.Plugging and oil displacement performance of?0.3%LAO+0.5%OA-12?and?0.3%LAO+0.5%AES?were compared under the selected optimized conditions,with injection experiment in 30cm-long core.The leading role of foaming ability in the practical application of foam was determined. |
PDF Full Text Request