杏北地区杏71区块井网部署及精细注水研究

发布时间：2018-08-13 17:47

【摘要】：低渗透油田储量丰富,合理的井网部署并制定精细注水方案对于高效开发低渗透油田具有重要意义。针对低渗透油藏的特点,开展了研究区两相渗流规律研究,分别研究了储层物性、流体性质、开发条件对含水变化规律、驱油效率及储层动用难易程度的影响。油藏工程方面,建立了含水与采出程度的关系曲线,利用双狐数字化软件建立了含水率平面分布图,并分析了纵向含水率变化规律;应用油藏工程方法建立了无因次采油、采液指数随含水率变化的数学模型,研究表明不同开发阶段,提高产液量对油井增产效果不同;提供了计算低渗透油藏采收率的新方法,引入井网系数概念,考虑因素更全面、准确。在油藏工程研究基础上,建立了研究区的数值模型,制定了适合于低渗油藏开发的合理井网部署方案。通过谢尔卡乔夫公式及曲线交汇法,计算出经济极限井网密度与经济合理井网密度,在极限井网密度约束下,应用数值模型对研究区井距、排距、井排方向与裂缝夹角、井网形式进行了优化,得出最佳井网部署方案。在数值模型及井网部署基础上,制定合理的精细注水方案。通过建立影响注水量因素的隶属度函数,与权重相结合得出注水量向单井及向层段的劈分,数值模拟结果表明,该分层注水方案较笼统注水具有较好的优越性;应用油藏工程方法与数值模拟方法相结合对不同超前注水量下地层压力保持水平、合理的超前注水时机进行了优化;注采比方面,应用物质平衡方程建立了地层压力恢复速度与储层物性、压缩系数、注采比、含水率关系的数学模型,数值模拟方法预测不同方案的开发指标,以含水上升速度、采收率等指标为约束,优选合理注采比;采油速度方面,利用动、静态参数与数值模拟法相结合计算研究区合理采油速度。研究表明地层压力保持在原始地层压力的1.20倍,超前注水量46823m3,超前注水6个月,注入强度1.91m3/(d·m),注采比为1.7,采油速度为1.4%时具有较好的开发效果。研究结果对低渗透油藏合理高效开发、提高采收率及经济效益具有重要指导意义。
[Abstract]:Low permeability oil field is rich in reserves. It is important to develop low permeability oil field with reasonable well pattern arrangement and fine water injection scheme. According to the characteristics of low permeability reservoirs, the two-phase percolation law in the study area is studied, and the effects of reservoir physical properties, fluid properties and development conditions on water cut variation, oil displacement efficiency and reservoir production difficulty are studied respectively. In reservoir engineering, the relation curve between water cut and recovery degree is established, the plane distribution map of water cut is established by using double fox digital software, and the variation law of longitudinal water cut is analyzed, and the dimensionless oil recovery is established by reservoir engineering method. The mathematical model of fluid recovery index varying with water cut shows that increasing liquid production rate has different effects on oil well production in different development stages, and provides a new method to calculate oil recovery factor in low permeability reservoir. The concept of well pattern coefficient is introduced, and the factors are considered more comprehensively. Accurate. On the basis of reservoir engineering research, the numerical model of the study area is established, and a reasonable well pattern arrangement scheme suitable for low permeability reservoir development is established. The economic limit well pattern density and the economical reasonable well pattern density are calculated by using the Shelkashev formula and the curve intersection method. Under the restriction of the limit well pattern density, the well spacing, well row direction and fracture angle of the study area are analyzed by using numerical model. The pattern of well pattern is optimized, and the optimal layout of well pattern is obtained. On the basis of numerical model and well pattern arrangement, reasonable fine water injection scheme was established. By establishing the membership function of the factors affecting the water injection rate and combining with the weight, the split of the single well and the direction interval of the water injection rate is obtained. The numerical simulation results show that the stratified water injection scheme has better superiority than the general water injection scheme. The reservoir engineering method and numerical simulation method are used to optimize the formation pressure and reasonable timing of water injection under different advance water injection rates, and the injection-production ratio, The mathematical model of the relationship between formation pressure recovery velocity and reservoir physical properties, compression coefficient, injection-production ratio, water cut is established by using the material balance equation. The development indexes of different schemes are predicted by numerical simulation method. The rational injection-production ratio is optimized and the dynamic and static parameters are combined with the numerical simulation method to calculate the reasonable oil recovery rate in the study area. The results show that the formation pressure is 1.20 times of the original formation pressure, the advance injection rate is 46823m3, the injection intensity 1.91m3/ (d m), injection-production ratio is 1.7, and the oil recovery rate is 1.4. The results are of great significance for the rational and efficient development of low permeability reservoirs and the improvement of oil recovery and economic benefits.
【学位授予单位】：东北石油大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TE357.6

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