The Research On Complex Thermal Fluid Huff And Puff Technology In Nanpu Oilfield Of The Bohai Sea

Heavy oil in China occupies a large proportion in oil and gas resources, but heavy oil is different from conventional crude oil, mainly because of the high viscosity. It is difficult to be developed by conventional methods, so some special technological measures are needed. The exploitation of heavy oil in China has developed many technologies such as steam stimulation, steam flooding, combustion in situ, etc., and thermal recovery is the main technology of heavy oil recovery. Currently, the onshore oilfield production is decreasing year by year, while the nation building and people living on oil consumption are increasing, so the growth of offshore oil production is an important part of the stability of the national oil consumption. Bohai oilfield is the oil field with high oil reserves and production, and the heavy oil reserves of the oil field is about 2/3. Due to the high viscosity, high flow resistance and poor liquidity characteristics, the effect of water flooding development is poor. The reasonable and efficient development of heavy oil reservoir has important significance for increase production and stable yields of offshore field. Due to the special natural environment of offshore and the limited conditions of oil production platform, in 2008, the heat injection life of pilot on B14 m well and B2 S was carried out in Nanpu Oilfield of the Bohai Sea. This paper is on the basis of existing research, using the southern of Bohai Oilfield as research platform, two thermal recovery wells, B33 h and B36 h, as the research object, carrying out the systematic research on multiple thermal fluid handling mechanism, thermal injection parameter optimization, heat injection supporting process design, on-site construction scheme and risk analysis, the thermal recovery well produced fluid processing etc. This paper extracts a whole set of technology design method and implementation plan which is suitable for offshore platform multi thermal fluid huff and puff technology. It has important guiding role for the comprehensive promotion of offshore platform multi thermal fluid huff and puff technology, as well as improving the offshore heavy oil development and promoting the efficient development of offshore heavy oil.