摘要
针对喇萨杏油田进入特高含水期“控水”难度大，原油成本急剧上升等问题，为实施有效调整，必须认识特高含水期油田含水上升规律。应用数值模拟计算、油水相渗透率曲线以及小井距井资料，分析了油层非均质性、原油黏度、开发调整措施对喇萨杏油田含水上升规律的影响。研究结果表明：喇萨杏油田非均质性严重，原油黏度也较高，中低含水期含水上升速度快，一半以上的可采储量要在高含水期后采出;当进入特高含水期后，油层非均质性、原油黏度等地质因素对含水上升速度的影响作用变小，其含水上升规律趋于由相渗曲线得到的含水与采出程度理论变化曲线;20世纪90年代初提出的通过注水产液结构调整实现稳油控水的开发模式有效地控制了油田含水上升速度。在此基础上预测了油田特高含水期含水变化趋势，提出了“控水挖潜”对策。
Aiming at difficulty for controlling water cut in high water-cut stage of Lasaxing Oilfield and oil production cost increase, an in order to implementing effective adjustment, water-cut rising rules for oilfield in high watercut stage must be understood. Numerical simulation data, oil/water relative permeable curve and dense well spac- ing data are used to analyze impact of reservoir heterogeneity, oil viscosity and developing adjustment methods on water-cut rising rules in Lasaxing Oilfield. Results show that Lasaxing Oilfield has high reservoir heterogeneity and high oil viscosity, water - cut increases rapidly in the middle and high water-cut stage, and more than half of recoverable reserves are produced in high water-cut stage. In addition, while entering super-high water cut stage, reservoir heterogeneity and oil viscosity have less impact on water cut increase, and water-cut increase rules tend to the theoretical variation curves of water cut and recoverable degree obtained from relative permeability. In the early of 1990s, water-cut rising speed of oilfield is effectively controlled by development pattern of ＂stabilizing oil produc- tion and controlling water cut＂ realized from water injection and fluid production adjustment. Based on this, water- cut variation trends in the super-high water cut stage of the oilfield are predicted and the method of ＂potential tap- ping by controlling water cut＂ is proposed.
出处
《大庆石油地质与开发》
CAS
CSCD
北大核心
2009年第6期79-82,共4页
Petroleum Geology & Oilfield Development in Daqing
关键词
含水
油层非均质性
原油黏度
调整措施
water-cut
reservoir heterogeneity
oil viscosity
adjustment measurement
