分段压裂水平井吞吐补充能量方式优化

OPTIMIZATION OF THE SUPPLEMENTARY ENERGY METHODS FOR THE HUFF AND PUFF OF THE STAGED FRACTURED HORIZONTAL WELL

Q7断块E1f2油藏储层物性差,为典型的特低渗透薄互层油藏,采用长水平段水平井通过大型分段压裂获得产能。由于无法通过注水补充能量,Q7P1井分段压裂投产后,产量呈指数递减,后因严重供液不足而停采,因此有必要研究通过吞吐等方式补充能量恢复产能。在模型建立、相态拟合和历史拟合的基础上,应用油藏数值模拟技术优化不同吞吐方式吞吐参数,结合技术预测指标和经济预测指标对比优选吞吐方式,开展CO_2吞吐矿场试验,取得了较好的增产效果。

The physical properties of Oil Reservoir E1f2 in Block Q7 are rather poorer and moreover these reservoirs are the typical extra-low-permeability interbedded ones,with the help of the long-staged horizontal well fracturing,the productivity of the oil reservoirs can be achieved. Because the energy can not be supplied by the water injection,after staged-fractured and produced for Horizontal Well Q7P1,the production was declined in the exponent way,and more seriously the well was shut in due to the extreme lack of the liquid supply,therefore it was necessary to consider and study Huff-and-Puff measures to supply the energy and recover the productivity. On the basis of the established model,phase and historical fittings,by means of the reservoir numerical simulating technique,the parameters of different Huff-Puff methods were optimized,integrated with the contrasts of the technical and economic predicting indexes,the Huff-Puff ways were optimized,the CO_2Huff-and-Puff field test was conducted and furthermore the much better stimulation effects were achieved.