Study On Development Geology And Development Deployment On Yongping Oilfield Of Songliao Basin

Yongping Oilfield is located on the northern part of Denglouku Cline of the southeast uplift district of the Southern Songliao Basin, is located in the territory of Ning Jiang, Songyuan City, Jilin province. Oil layer of oilfield is fourth members of Quan for the Fuyu oil layer, dead oil viscosity is 6000 ~ 30000mPa.s in the oil temperature. According to the Chinese classification standard of heavy oil, the crude oil properties are belonging to the ordinary heavy typeⅡand special heavy type. The single well production, which do not-yield in the general conditions, could be improved by thermal recovery, Prophase Steam stimulation had be carried out to see some effects. For rational and efficient development of Yongping oil fields, the paper launched a lot of research work, including a heavy oil reservoir geological characteristics developed comprehensive study, Performance Analysis of Steam Injection, Steam injection heavy oil reservoir engineering development and optimization of overall development and so on.Studied in detail based on the development of geological features such as structural features of the reservoir, reservoir microfacies, reservoir distribution, water distribution, reservoir control factors, flow characteristics of rock, and fluid properties, Yongping oilfield has the characteristics of buried shallow, thin oil, oil scattered distribution, oil saturation characteristics of low and high viscosity of crude oil, and analyze development geological features impact on development effect of thermal recovery.On the basis of comprehensive interpretation of the log data, sub-unit of crude oil reserves could be calculated by using volume method. Application of geostatistics and stochastic processes of stochastic simulation phased method, the reservoir constructed underground reservoir model and the properties spatial distribution parameters model to reflect the physical properties (pore,permeability and saturated) could be established, the geological reserves, which to be calculated by geological modeling grid meets the modeling reserves accuracy requirement, had provided the foundation for the numerical simulation.Through to picks the hotly well production performance analysis, it is explicit to consider that the main effect of thermal recovery had thin oil, crude oil low saturation and high viscosity, and other effect included intensity difference in some wells and underground injection of water coning. The method, which were increasing the strength of steam injection and effective heating oil, and increasing formation pressure through mixed gas cleanup and so on, could be solution the problem of the low temperature un-flow oil layer, and also an effective solution the conflict of the low layer pressure and a short period, and increased the stimulated well production and improved the effect of multi-round development.Optimization of petroleum reservoir engineering had be researched through using numerical simulation, physical simulation, injection/production parameter optimization, allied field analogy and other methods. The results showed that cyclic steam injection and steam flooding were suitable for the development of inspissated pool of Yongping Oilfield. We arrange the wells with 100×86m inverted nine spot rectangle well patterns, set the steaming strength of steam stimulation as 90～110t/m, and turn into steam flooding after four cycles of steam huff and puff. After studies on the sensible parameters that influential for development effect, such as reservoir thickness, SATO, fracture, we thought that steam injection development is more suitable for the petroleum reservoir whose effective thickness is bigger than 4m, and whose SATO is bigger than 55%. And we can slow the speed of steam channeling by extending the well spacing of steamed well and stimulating well in EW direction in appropriate level.Aiming at Yongping oil fields' reservoir thickness thin, reservoir span wide and sandstone thickness and stratum thickness ratio low resulting in steam injection process each position suction steam the uneven, deploy locating wells in the major reservoirs centralized development thought the area was proposed. Based on the distribution and oil-bearing sand body rather than the comprehensive research of the major reservoirs, determine the centralized development, effective thickness is greater than 4m and sandstone thickness and stratum thickness ratio more than 0.4 areas deployment. According to the Yongping oil fields' reserves abundance, and capacity level, implement a difference of degree and ground conditions, the difference of the existing facilities, and first development rich reservoirs then the lean reservoirs principle, the Yongping oilfield reservoirs steam injection process in accordance with greater than 8m, 6 ~ 8m and greater than 4m order into three times to implement. It was forecasted that development period is 11 years, total steam injection quantity is 2216.7×10~4t, total mining crude oil 315.6×104t, and stage for recovery degree is 32.3%.