超低渗透油藏注气方式优选数值模拟研究

Numerical Simulation Research on Optimization of Methods of Gas Injection into Ultra-Low Permeability Reservoirs

超前注水作为超低渗透油田开发整体上的主体技术，取得了比较好的开发效果，但同时也存在一些问题．为了能有效提高单井产量．探索新型开发方式，开展注气开发方式研究有十分重要的意义。以采出程度和原油累计产油量的增加值作为方案优劣的两大衡量指标，研究不同注气开发方式对超低渗透油藏开发效果的影响，研究结果表明：注入井类型为直井时，油井投产后，连续气水交替驱方案显示出很大的优势；与直井相比，在同样的注入条件下，水平井的气水交替驱表现出更大的优势：连续注气方案和注水3个月后连续注气方案从采出程度和原油累计的产油量来看．增加值最大，但气油比上升的较快；一直脉冲注气，注入和采出交替比例为4：2时，单井产能比其他方案的都高，但在同样的开发时间内．采出程度较低。综合比较认为不同注气方式中连续气水交替驱对提高超低渗透油藏的开发效果优势明显。

In this paper, the cumulative oil recovery efficiency and oil production increase in value as the merits of the two programs measure to study the development of various gas injection method for uhra-low permeability reservoir effect, the results showed： type of injection well for the vertical wells, the wells put into operation, continuous water and gas alternate drive scheme shows a great advantage; compared with vertical wells in the same injection conditions, the level of displacement water alternating gas wells show a greater advantage; continuous gas injection program and after 3 months continuous injection of gas injection program from the oil recovery efficiency and the cumulative oil production point of view, the biggest increase in value, but the rapid rise in gas oil ratio; been pulsed gas injection, injection and recovery ratio of 4 alternating ： 2, single well prnduction are higher than other programs, but in the same development time, less recovery. Comprehensive comparison of different gas injection in the way that the continuous water and gas alternate drive to improve the development effect of ultra-low permeability reservoir obvious advantages.