【作者】 潘建华；

【导师】 吴文祥；

【作者基本信息】 东北石油大学 ， 油气田开发工程， 2011， 博士

【摘要】 牛心坨油田原油粘度高,含蜡量高,油水流度比的差异较大,加之油藏非均质性严重,且低孔低渗,目前已进入中高含水期(70%以上)产量快速递减阶段,尤其下层系及合采区水淹更加严重,综合含水已达75%以上,以往所进行的措施(压裂、调剖、分注)无法起到稳油控水作用,开发难度越来越大,举步维艰,迫切的需要研究筛选出低成本高效的调驱技术,提高牛心坨油田注入水波及体积及注水效率,改善牛心坨油层开发效果,从而达到稳油控水进一步提高牛心坨油层采收率的目的,为牛心坨油田的良性发展提供技术支持。该项目应用室内物理模拟实验方法,利用牛心坨油田天然岩心,分别进行聚合物驱和聚合物／活性剂二元复合驱的驱油实验,通过考察这些驱油体系的驱油效果,选择出适合牛心坨油田的最佳驱油体系。本文应用了数值模拟方法,建立了牛心坨油田N1-N7油层的精细地质模型,在水驱历史拟合的基础上、完成了T33-35井组及全区的水驱方案预测、调驱参数及段塞注入方式的优选,其中调驱参数优选主要包括聚合物分子量、用量、溶液浓度、注入速度、调驱时机的优选,形成适合牛心坨油田的最佳驱油方案,使牛心驼油田原油采收率在水驱基础上提高10个百分点左右。经过对不同含水初值分类的井组进行聚驱注入参数数值模拟的研究可知：综合含水率小于80%的井组其最佳驱油方案为采用先调后驱的方法,调剖剂用量为0.02PV,注入主段塞1500mg/L聚合物0.3PV,注入保护段塞800mg/L,0.2PV,注聚速度为0.075PV/a,后续水驱至含水98%；而综合含水率大于80%的井组其最佳驱油方案为采用先调后驱的方法,调剖剂用量为0.02PV,注入主段塞1500mg/L聚合物0.3PV,注入保护段塞800mg/L,0.2PV,注聚速度为0.08PV/a,后续水驱至含水98%。经过牛心坨油层聚驱注入参数数值模拟优选出适合现场施工的最佳驱油方案为：采用先调后驱的方法,调剖剂用量为0.02PV,注入主段塞1500mg/L聚合物0.3PV,注入保护段塞800mg/L,0.2PV,注聚速度为0.08PV/a,后续水驱至含水98%。更多还原

【Abstract】 Niuxintuo is an oil field of high oil viscosity and high wax content, the oil flow ratio greater difference, together with high reservoir hetergeneity and low porosity and low permeability. At present, it has entered into the yield rapid declining stage with high water-cut stage(above 70%), flooded is more serious especially for the sinking department and close mining areas which integral water content is above 75%. The measures taken before such as fracturing, profile control and the separated injection cannot stabilize oil production and controlling water cut. Consequently, the development of it becomes more difficult, a new low cost and high efficiency displacement technology is badly needed to be studied in order to improve injected water sweep volume and injected water sweep efficiency in the Niuxintuo oil field, as well as to improve the effect Niuxintuo oil formation development, in this way, we will achieve the target by further stabilizing oil production and controlling water cut to boost the recovery of Niuxintuo oil formation, as well as being a technological support for the sound progress of Niuxintuo reservoir.This project uses the laboratory physics analog testing manner which is based on the fine geology model of Niuxintuo oil field natural rock, respectively uses the manners of polymer flooding and the polymer/surfactant binary complex flooding to carry on the displacement experiment, so as to select the best displacement system suited to Niuxintuo oil field through investigating the outcome of these displacement systems.The numerical simulation method is adopted in this article to establish the fine geology model of the oil layers ranged from N1 to N7 in the Niuxintuo oil field. Depending on the water flooding history matching, we accomplished the water flooding forecast of T33-35 well-group and the whole areas, as well as the best selection of the adjustable flooding parameters and the slug injection pattern. The selection of adjustable flooding parameters including polymer molecular weight, the dosage of polymer, the solution concentration, injection speed and the time of slug injection. Use this manner to come into being the best displacement measure for Niuxintuo oil field which had improved about ten percent of the crude oil recovery in the Niuxintuo oil field depending on the water flooding.更多还原