隔夹层对直井水平井SAGD发开效果的影响

辽河油田兴VI组SGAD先导试验区储层中由于隔夹层的存在,使得直井水平井SAGD蒸汽腔扩展以及开发效果受到影响。在分析试验区地质特征的基础上,通过建立理论模型的方法,研究了SAGD过程中夹隔层对蒸汽腔的扩展规律、含水率以及开采程度的影响。研究结果表明：隔夹层仅在SAGD开发初期对蒸汽腔的扩展产生一定的影响,导致井组含水高、产量低,蒸汽腔的斜面比较粗糙,使得其泄油面增长。但总体上不会影响蒸汽腔的形成以及SAGD开发的最终采收率,只是在刚形成蒸汽腔时对其局部的扩展起到了一定的减缓作用,导致各阶段的生产时间不一样。采用在直井与水平井之间以重力泄油为主,在直井与直井之间是以蒸汽驱为主的复合开发方式,在注汽井隔夹层上下同射,直井辅助生产,实现SAGD与蒸汽驱联合驱开采的方式,可以有效地降低隔夹层在SAGD开发中的影响。

The influence of interlayer on the development effect of the vertical and horizontal wells SAGD

Because the existence of the interlayer in the reservoir of Xing VI Group SAGD pilot site in liaohe oilfield,it makes the steam chamber development and the effect of development of vertical and horizontal wells SAGD affected.Based on the analysis of geological characteristics of the experimental area, we study the rule of SAGD steam extension, moisture content, and the mining degree by establishing theoretical model.The research results show that the interlayer have influence on the propagation of the steam chamber only at the beginning of the SAGD progress,it results in the water content of well group is high and output is low,then the slope of the steam chamber is coarser,and make its drainage surface longer. But it will not affect the formation of the steam chamber and the ultimate recovery of SAGD development in generally, it only have played a role in slowing the expansion velocity of the paritial of steam chamber when it forms in the early time,it results in each stage of the production time is different.Using the method of gravity drainage between the vertical well and the horizontal well,and using the way of steam drive between the vertical Wells and vertical Wells,shuting at the same time at the up and down interlayer of the steam injection wells.It realizes the way of SAGD and steam drive combined exploitation, it can reduce the influence on the interlayer in the of SAGD development.