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控缝高酸压技术是塔河油田针对碳酸盐岩垂向应力差小、高角度裂缝发育、底水发育的区域提出的一项改造技术。该技术实现了底水发育区储层的有效动用,增油效果明显。但随着酸压层段平均避水高度由36.5 m减小到21.2 m,建产率由76.4%降低至72.1%。作为控缝高的第一步,如何选井提升效果是亟待解决的问题。在系统分析控缝高酸压井前期地质特征和酸压效果基础之上,提出了控缝高酸压的选井原则:1风化壳岩溶发育模式;2上部储层剩余油富集;3具有高阻隔层;4避水高度大;5深部挤堵及压前射孔的井。并应用权重分析法对选井原则进行量化。经现场应用证明该方法对控缝高酸压具有指导作用。
The control seam high acid pressure technology is a modification technology put forward by Tahe Oilfield in the area of carbonate rock with small vertical stress difference, high angle crack development and bottom water development. The technology realizes the effective utilization of the reservoir in the bottom water development zone and has obvious oil increasing effect. However, as the average water avoidance height of the acid pressure section decreased from 36.5 m to 21.2 m, the production rate decreased from 76.4% to 72.1%. As the first step in the control seam height, how to choose the well to enhance the effect is an urgent problem to be solved. Based on the systematic analysis of the geologic characteristics and acid pressure effect of the pre-control high acid fracturing well, the principle of well control with high acid pressure is proposed: 1 weathering karst development model; 2 remaining oil enrichment in the upper reservoir; 3 High barrier layer; 4 large water avoidance height; 5 deep squeeze blocking and pre-pressure perforating wells. The weighting method is applied to quantify the well selection principle. The field application shows that the method has a guiding effect on the high acid pressure of the seam.