苏里格气田细分粒径支撑剂导流能力评价及试验

Appraisal and experiment of proppant flow capacity with grain size subdivided in the Sulige Gas Field

苏里格气田主力气层必须要进行压裂才能获得有效的井口产能,而获得较高的压裂裂缝导流能力则是其关键所在,然而国内外现用的支撑剂导流能力评价标准中支撑剂的粒径划分范围较大,只有针对不同类型气层采用合理粒径支撑剂进行压裂改造,才能有助于提高改造效果,进一步提高单井产量。为此,以苏里格气田现用的多家陶粒支撑剂性能评价为基础,通过新的支撑剂粒径划分和筛选,对符合苏里格气田压裂用支撑剂进行室内实验,开展了不同组合方式下的裂缝导流能力评价,优化适合该区域不同储层条件的支撑剂及粒径,并开展现场试验,取得了较好效果,为提高储层改造针对性、改善压裂改造效果提供了新的方法。

Commercial gas production in the Sulige Gas Field will be possibly achieved only through fracturing treatment, the key of which is to get a higher flow conductivity of fractures. However, grain size division of proppant is relatively coarse in the current standards for the evaluation of proppant flow capacity. Only when proppants with optimal grain sizes are selected for different types of gas layers, the effects of fracture stimulation can be improved and thereby the productivity per well can be increased. Based on the performance evaluation of several kinds of ceramic proppants currently used in this field, new standards of grain size subdivision and proppant selection are introduced and used for identifying the proppants with suitable grain sizes for this gas field. Laboratory tests are performed on the selected proppants with different grain sizes to appraise their fracture flow capacities and thus the optimum proppants with best grain sizes adaptable for this study area are determined under different reservoir conditions. Pilot tests show that in this way, the effects of fracturing stimulation are significantly improved.