水动力改变液流方向技术在低渗透油藏中的应用——以新疆宝浪油田宝北区块为例

Using hydrodynamic force to change flow direction in low-permeability oil reservoirs——an example from the Baobei block in Baolang oilfield,Xinjiang

李伟才 崔连训 赵蕊

Li Weicai Cui Lianxun Zhao Rui

针对低渗透油田水驱采收率低、水驱效果差、液流方向单一等问题,以新疆宝浪油田宝北区块为例,对水动力改变液流方向技术在低渗油藏中的应用进行了相关研究。首先从水动力改变液流原理出发,总结出调整注水井、调整采油井和采油井转注3种水动力改变液流的工作原理。其次,结合油田实际地质及生产情况,从注水井增补及开发层位调整方面,对油田52口生产井制订了改变液流方向的具体措施。最后,利用油藏数值模拟技术对上述措施进行了评价,预测措施实施后15年综合含水率上升6.36%,产油量增加26.51×10 t,日产油增加59.34 t/d。预测结果表明,水动力改变液流方向技术应用在宝北区块这样的高含水、低渗透油藏中能取得较好效果。该技术可有效抑制低渗透储层含水率上升,增加单井产量,提高储层水驱采收率。

The development and production of low-permeability oil reservoirs have been staggered by problems such as low recovery factor and low efficiency of waterflooding,singular direction of fluid flow and etc.How to effectively develop this kind of reservoirs therefore has gained more and more attention around the world in recent years.The paper discussed a study on the application of a flow direction changing method with hydrodynamic force in the Baobei block of the Baolang oilfield in Xinjiang Autonomous region.The study suggests that there are three ways of changing flow direction with the hydrodynamic force:water injector adjustments,producer adjustment and conversion of producers to injectors.Based on practical geological and production data of the oilfield,the study offered practical measures for changing flow direction in 52 producers through infilling injectors and adjusting producing layers.An evaluation was also carried out by using reservoir numerical simulation model to check the effectiveness of these measures during the study.The model predicts increases in comprehensive water cut by 6.36%,oil production by 265,100 tons and daily oil output by 59.34 tons fifteen years after the measures being taken.Based on the prediction,the paper comes to the conclusion that the method can effectively impede water cut increasing,increase single production,and enhance waterflooding recovery factor in oil reservoirs with low permeability.

10.11743/ogg20120518