带高渗层孔隙型碳酸盐岩水流通道分析及控水措施优化

Analysis of Water Flow Channel in Porous Carbonate Reservoir with High Permeability Layer and Optimization of Water Control Measures

为深入剖析伊拉克Ahdeb油田注水开发机理及控水措施,开展两注一采正对水平井网的数值模拟分析,定量刻画高渗层水流通道,研究高渗层、垂向渗透性和井位对含水规律的影响,提出控水措施并优化控水参数。结果表明:高渗层水流通道是含水上升快的主因,孔隙型碳酸盐岩储层特有的垂向渗透率高是助推因素,井位关系使水驱认识复杂化;控水措施以堵水为主,堵水位置越靠近油井越好,堵水规模为20~40 m段塞;调整注采比也可实现降水和控水目的,优化值为0.7~0.8。

In order to deeply analyze the water injection development mechanism and water control measures of Ahdeb oilfield in Iraq,the numerical simulation of the horizontal well pattern of two injection and one production is carried out,and the water flow channel in the high permeability layer is quantitatively characterized.The influences of high permeability layer,vertical permeability and well position on water-cut varying law are studied,water control measures are put forward,and the water control parameters are optimized.The results show that the main reason for the rapid rise of water cut is the water flow channel in the high permeability layer,and the unique high vertical permeability in the porous carbonate reservoir is the driving factor.The well location relationship complicates the understanding of water flooding.Main water control measures is water plugging.The closer the water plugging position is to the oil well,the better the effect is.The water plugging scale is the slug of 20~40 m.Adjusting the injection-to-production ratio can also achieve the purpose of water control,and the optimal injection-to-production ratio is 0.7~0.8.