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在阿萨巴斯卡油藏MacKay River SAGD工艺的基础上,使用油藏属性和操作条件进行了二维和三维数值模拟。研究了小井眼直井对与水平井对的横向偏移为7m的、油藏中有无页岩层或泥岩夹层的影响,以及小井眼井的截面和小井眼井的间距对SAGD性能的影响。同时,研究了油藏、小井眼井渗透率的影响以及从注入井或生产井上钻出的水平小井眼的效果。小井眼井是利用高渗透垂直通道采用加密网格来实现的,而各小井眼井之间气体和液体的对流是通过调整小井眼井的相对渗透率来实现的。对于一个有连续页岩层的油藏,小井眼直井提高了SAGD性能,因为在页岩层上方形成了第二个蒸汽腔,采收了之前无法采出的原油。
Based on the Atakashka reservoir MacKay River SAGD process, two-dimensional and three-dimensional numerical simulations were performed using reservoir properties and operating conditions. This paper studies the effect of vertical hole with slim hole on the performance of SAGD with lateral offset of 7m for horizontal well and whether there is shale or mudstone interbed in the reservoir and the influence of the section of slimhole and the interval of slimhole. At the same time, the effect of reservoir and slimhole permeability and the effect of horizontal slim borehole drilling from injection or production wells were studied. Slimhole wells are constructed using an encrypted grid with highly permeable vertical channels and the convection of gas and liquid between wells in the slim wells is achieved by adjusting the relative permeability of the slimhole. For a reservoir with continuous shales, the SAGD performance was increased for the slimhole vertical wells because a second steam chamber was formed above the shale layer, recovering previously undeplorable crude oil.