Multi-agent Fluid Development Research On Heavy Oil Reservoir

Most of the heavy oil reservoirs in China are on the middle and later stage of huff and puff.The steam flood with additives as an efficient process is received widespread domestic and foreign attention.Additive assisted steam flood not only has the characteristic of the steam flood,but also can improve the displacement efficiency and sweep efficiency,which has the ability of improving development efficiency of the heavy oil and the advantage of exploring the advanced technologies for developing the heavy oil reservoir.Nowadays,it is the stage that the production of the heavy oil is decreasing fast.It is necessary to research,test and generalize novel technology for development of the heavy oil.Multi-agent fluid process can not only improve the efficiency of the high round huff and puff,but also efficiently develop the heavy oil reservoir can not be developed invalidly with the current technology.The most important point of the process of the multi-agent fluid is to get the technology breakthrough for heavy oil recovery with the initial creation.With the trial,the fundamental mechanism and critical technology is improving continuously,which will effectively deal with the the problems of production decline,low oil recovery and bad economical profit.Through the experiments of the multi-agent fluid,it is formed the sophisticated experiment methods and the experiment platform for the fundamental research of the multi-agent fluid;by means of the 1-D and 3-D physical experiments and numerical simulation and trial in the field,the multi-agent fluid is researched;evaluating the several kinds of the foam agents,the high-temperature high-pressure foam agent is selected.the mechanism of the urea and foam agent is studied with 1-D physical simulation experiments of eight experiments of hot water flood and additives assisted hot water flood,steam flood and additives assisted steam flood,which lays the foundation of the multi-agent fluid;the growing of the steam chamber and the flood efficiency is researched by 3-D multi-agent fluid of the physical simulation experiments of steam flood converting to urea assisted steam flood and steam flood converting to urea and foam agent assisted steam flood,which lays the foundation of the trial in the field.With the trial,the geologic feature and the development feature is researched,besides the history matching,parameter optimization and production index forecast are taken.The increasing effect is evaluated.The result of the 1-D physical simulation experiments showed that the most cumulative displacement efficiency difference of the multi-agent fluid was 9.41%more than the steam flood.The result of the 3-D physical simulation experiments showed that he most displacement efficiency of the multi-agent fluid is 16.28%more than the steam flood.The experiments and numerical simulation showed that it was efficient for multi-agent fluid to improve oil recovery.The feasibility study on multi-agent fluid was taken to the Jin45 trial block in Liaohe oilfield and predicted the production of the next five years,the result of the study showed that the process of the multi-agent fluid could improve oil recovery efficiently.