摘要
由于受断块和井网影响,复杂断块油藏往往呈现"不注水没能量、注水后水淹快"的状况,导致常规注采方式下采收率较低。为了研究注采耦合技术提高注采压差幅度、扩大波及系数以及剩余油动用情况,将临盘油田三角形封闭断块油藏剩余油分为7个特征区,利用数值模拟方法研究注采耦合方式下注水和采油过程中各特征区液流方向的变化。结果表明:各特征区呈现明显的液流转向特征,剩余油均受到注入水的波及,其饱和度有不同程度的降低;注采耦合技术通过压力场的交替变化,不断打破油藏内部稳定渗流场的平衡关系,改变油水原有的流向,扩大注入水的波及系数,可使常规注采开发方式难以动用的断块边角特征区参与渗流,提高剩余油动用程度。
Due to the influences of the fault block and the well pattern, the complex fault-block oil reservoir always presents the conditions of ＂without water injecting, there is no driving energy; while on the contrary, the watered- out is rapid＂, thus for the conventional injecting modes, the recovery is rather lower. In order to improve the injection-production differential pressure, expand the swept coefficient and develop the remained oil for injection-production coupling technique, seven characteristic blocks were divided for the remained oil in the triangle closed fault- block oil reservoir in Linpan Oilfield, with the help of numerical simulating method, the changes of the fluid flow direction in each characteristic area were studied in the process of the injection and production under the injectionproduction coupling mode. The results show that the diverting characteristics of the flow direction are obvious for each block, all the remained oil is degrees; by means of the alternate flooded by the injected water, and their oil saturations are decreased in different change of the pressure field, the technique can continuously break the equilibri-um of the stable percolation field within the internal reservoir, therefore the original flow directions of the oil and water can be changed, the swept coefficient of the injected water can be enlarged, the characteristic blocks in the corner are forced to take part in the development, which are difficult to flooded by the conventional injection-production mode, finally the developed degree of the remained oil can be enhanced.
作者
王瑞
袁士宝
王建
徐波
WANG Rui;YUAN Shibao;WANG Jian;XU Bo(Sinopec Petroleum Exploration and Development Research Institute,Shengli Oilfield Company,Dongying 257015,China;Petroleum Engineering Institute of Xi＇an Shiyou University,Xi＇an 710065,China)
出处
《大庆石油地质与开发》
CAS
CSCD
北大核心
2018年第6期38-42,共5页
Petroleum Geology & Oilfield Development in Daqing
基金
国家科技重大专项"复杂断块油田提高采收率技术"(2016ZX05011-002)
关键词
复杂断块油藏
注采耦合
特征区
数值模拟
水驱采收率
complex fault block oil reservoir
injection-production coupling
characteristic block/area
numericalsimulation
water flooding recovery
