非均质砂岩油藏异步周期注水数值模拟理论及应用研究  

Study of Theory and Application of Asynchronous Cyclic Waterflooding Numerical Simulation for Heterogeneous Sandstone Reservoir

作　　者：殷代印[1] 薛小博[1] 

机构地区：[1]大庆石油学院提高油气采收率教育部重点实验室,黑龙江大庆163318

出　　处：《数学的实践与认识》2009年第23期107-112,共6页Mathematics in Practice and Theory

摘　　要：针对砂岩油藏周期注水特点,综合考虑弹性力、毛管力和重力的影响,建立起非均质砂岩油藏异步周期注水数学模型,并推导出相应的数值解.提出了一种新的流动系数取值方法,能够准确描述停注过程中毛管力作用引起的吸渗现象.在杏树岗油田周期注水试验区进行了实例验证,结果表明:地层压力相对误差为4.0%,产液量相对误差为3.2%,含水率绝对误差为0.9%.应用该方法对杏树岗油田厚油层不同周期注水方案进行了数值模拟计算,决定采取异步周期注水方案,并确定出合理的油层纵向组合方式和水井平面组合方式.平均注水强度为25m3/(d.m)左右,注水和停注半周期都是3个月.现场实施5个月后,区块综合含水率由92.17%下降到91.51%,产油量稳定,预计最终水驱采收率提高1%以上,取得了良好的开发效果.The asynchronous cyclic waterflooding mathematical model for heterogeneous sandstone reservoir is established and a numerical solution is derived in this paper,based on comprehensive analysis about the characteristics of cyclic waterflooding and the influences of elasticity, capillary and gravity on cyclic waterflooding.A new method is established to determine flow coefficient which can well describe the imbibition phenomenon due to the action of capillary force.It is approved in the cyclic waterflooding test area in Xingshugang oilfield that the result calculated with the new method error of formation pressure is about 4.0%, the and the absolute error of water cut is matches with the production data, the relative relative error of liquid production rate is 3.2%, his method has been used to perform numerical simulation calculation of different cyclic waterflooding projects for the thick in Xingshugang oilfield, the patterns of reasonable layer group into which water is injected and the patterns of well group are obtained. The average injection intensity is about 25m^3/（d · m）, the cycle is 3 months, and termination cycle of injection is 3 months, too. After five months, synthetical water cut of test area declines from 92.17% to 91.51%, but oil production remains stable. It is predicted that the waterflooding recovery efficiency can be enhanced by be obtained

关 键 词：砂岩油藏 异步周期注水 毛管力 流动系数 数学模型 

分 类 号：TE357.6[石油与天然气工程—油气田开发工程]