摘要
综合考虑弹性力、毛管力和重力的影响 ,建立了非均质层状砂岩油藏周期注水数学模型 ,提出了一种新的流动系数取值方法 ,并导出了相应的数值解 ,能够准确描述停注过程中毛管力作用引起的吸渗现象 .实例验证表明 :地层压力相对误差为 4 .0 % ,产液量相对误差为 4 .2 % ,含水率绝对误差为 1.1% .影响周期注水效果的主要因素是渗透率变异因数和层间连通程度 ;适合周期注水的油藏地质条件为 :层间连通程度大于 0 .6 ,非均质变异因数为 0 .6～ 0 .
The math models for cycle injection of heterogeneous layered sandstone reservoir is established, in consideration of the influence of elasticity, capillary and gravity. A new method for determining flow coefficient is proposed. This method can well describe the inhibition phenomenon. The corresponding numerical solution is derived. The math model is validated by cycle injection test in Sabei transition zone. The relative error of formation pressure is 4.0%, and the relative error of liquid production rate is 4.2%. The absolute error of water cut is 1.1%. The main factors influencing cycle injection outcome are the permeability variation coefficient and connectivity degree between layers. The appropriate geological conditions are those reservoirs whose connectivity degrees between layers are greater than 0.6 , and the permeability variation coefficient ranges from 0.6 to 0.8.
出处
《大庆石油学院学报》
CAS
北大核心
2000年第1期85-87,共3页
Journal of Daqing Petroleum Institute
基金
中国石油天然气集团公司"九五"科技攻关项目! (96科字第 2 13号 )
关键词
周期注水
弹性力
数学模型
砂岩油藏
油田注水
cycle injection
elasticity
capillary force
math model
sandstone reservoir
