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压裂井的产能影响因素研究可为压裂设计指明参数优化方向。以玛北油藏为例,采用E-Stim Plan软件对油藏产能进行预测,并在此基础上分析了影响产能的主要因素,得到下列结论:压力系数对产量的影响非常大,应优选压力系数高的区域开展钻井压裂工作;环玛湖砂砾岩储层都有不同程度的压敏现象,大大影响了产量;在目前的储层条件以及分级压裂级数要求下,完井方式对产量影响不大;随着裂缝长度的增加,产能相应增大,但到达一定的长度之后,长度增加对产能增加的贡献量减小;当储层地下渗透率为0.1m D时,长期导流能力在130~160m D·m为优;20~40目陶粒、覆膜砂满足有效应力30MPa下导流能力为130~160m D·m的要求;水平段越长,产量越高,而水平段长度的选取受其他诸多因素限制;当储层地下渗透率为0.1m D时,700m水平段长优选的裂缝条数在14~16条之间;在支撑剂容易沉降的储层,裂缝容易向上延伸有利于产层整体导流能力的提高,反之则不利于整体导流能力的提高。
Research on the influencing factors of fracturing well productivity can indicate the optimal direction of fracturing design parameters. Taking Mabei reservoir as an example, E-Stim Plan was used to predict reservoir productivity. On the basis of this, the main factors influencing production capacity were analyzed. The following conclusions were obtained: the influence of pressure coefficient on production is very large, Coefficient fractures in the area to carry out drilling and fracturing work; Huanmahu sandstone conglomerate reservoir has different degrees of pressure-sensitive phenomena, greatly affected the yield; under the current reservoir conditions and grading fracturing requirements, completion methods But the effect of the increase of the length on the increase of productivity can be reduced. When the underground permeability of the reservoir is 0.1m D, the long-term diversion The ability of 130 ~ 160m D m is excellent; 20 ~ 40 mesh of ceramsite, coated sand to meet the effective stress 30MPa under the diversion ability of 130 ~ 160mD m requirements; the longer the horizontal section, the higher the yield, while the level The selection of section length is limited by many other factors. When the underground permeability of reservoir is 0.1m D, the optimal number of cracks in the 700m horizontal section is between 14 and 16; in the reservoirs where the proppant is easily subsided, the cracks are easy to crack Upward extension is conducive to improving the overall capacity of diversion layer, otherwise not To improve the overall capacity of the diversion.