蓬莱19-3油田纳米驱油技术研究与应用

Research and application of nano oil displacement technology in PL19-3 oilfield

蓬莱19-3油田注采优势通道明显,存在无效水循环,常规调堵体系在该区块注入性差,无法进入小孔道中提高微观水驱波及体积。本文以蓬莱19-3油田储层性质和流体为模拟对象,通过室内实验测定界面张力、降黏能力、润湿性、洗油能力等性能参数评价纳米分散体驱油体系,表明纳米分散体可有效降低原油界面张力达到10-3mN/m数量级,静态洗油效率达到79.1%,并采用数值模拟优选注入参数。经在蓬莱19-3油田A井组实施矿场实验,单井含水最高下降17%,井组递减增油6400 m3,有效期为8个月。结果表明,纳米分散体调驱技术是蓬莱19-3油田控水增油的有效方法,也为类似储层控水增油方案设计提供借鉴。

The dominant injection-production channel in PL19-3 oilfield is obvious,resulting in invalid water circulation.Conventional profile control and plugging agents have poor injectability in this block and cannot enter into small pore channels to improve the sweep volume.In this paper,reservoir properties and fluids in PL19-3 oilfield are taken as objects,and performance parameters such as interfacial tension,viscosity reduction ability,wettability and oil washing ability are measured through laboratory experiments to evaluate the system of nano-dispersion.It indicates that the nano-dispersion can effectively reduce the interfacial tension to the order of 10-3mN/m,and the static oil washing efficiency reaches 79.1%.The injection parameters were optimized by numerical simulation.After the field test in PL19-3 oilfield,the water cut decreased by up to 17%,and the oil increase 6400 m3,with an effective period of 8 months.The results show that nano-dispersion flooding technology is an effective method for water control and oil increase in PL19-3 oilfield,and also provides reference for similar reservoir water control and oil increase scheme design.