水平井开采聚驱后侧积夹层剩余油的实验研究

为了研究在水驱及聚驱的基础上,水平井-直井联合布井方式对提高侧积夹层采收率的影响情况,根据数模研究的注水方向和水平井起始及终止位置对采收率的影响,优选了侧积夹层水平井的布井位置研制了侧积夹层室内物理模型进行了室内实验研究。结果表明:采用直井注水井注-水平井采的实验方案,含水率下降了17%,采收率提高了4.99%;采用直井油井注-水平井采的实验方案,含水率下降了25%,采收率提高了4.83%;采用直井油水井合注-水平井采的实验方案提高侧积夹层采收率9.82%,;远离水井及油井的侧积体剩余油多,临近油井的侧积体剩余油少,直井水井与油井同时注高浓聚合物,水平井分段开采时侧积体1、2、3分别提高采收率1.73%、6.98%、5%.但水平井不能穿过侧积体4,否则总采收率会下降。

Experimental Researches on Horizontal Well to Exploit Remaining Oil of Lateral Accretion Interbed after Polymerflooding

In order to study the effect of the horizontal well and vertical well uniting together on exploiting lateral accretion interbeds remain oil, physical models are developed. The model is first injected water then polymer. Numerical simulations are done before making physical models. Numerical simulations are optimized for injection water directions and horizontal well start and end position .The physical models are made according to numerical results. Thus placing well position of horizontal well is optimized.The laboratory experiments are performed on the optimized physical models.The results indicate that the recovery enhancement of the experiment which vertical well is a injection well and horizontal well is a production well is 4.99% and moisture content decreases by 17%.Using the vertical well as injection and production well, the moisture content fall by 25%,the recovery increases by 4.83%. The plan of vertical injection and production well joining together injection can improve recovery 9.82%. The lateral accretion body far away the water well and the oil well remaining oil is more. The lateral accretion body approaching the oil well remaining oil is less. At the same time vertical water well and oil well inject high concentration polymer, when the horizontal well exploit, the lateral accretion body 1, 2, 3 recovery enhancemet respectively is 1.73%, 6.98%, 5%. The horizontal well can not pass through the lateral accretion body 4, otherwise the total recovery will drop