新召东致密气藏水平井整体压裂技术

Horizontal Well Integral Fracturing in Tight Gas Reservoir of East Xinzhao

新召东井区即将进入规模评价开发阶段,需开展整体压裂研究。以基于弹性开发的气田整体采收率、井组收益率为评价指标,从井组布井方案及单井裂缝参数两个方面进行针对性研究,基于产能模拟明确布井方案及其设计思路,基于裂缝扩展模拟明确整体压裂下单井的裂缝形态。研究表明,考虑储层的非均质性时,布井应向河道沉积中部集中,可以有效提高整体产能,相同井距下四井井组的产能可达到5井井组产能的94%;非均匀布井方案可提高整体产能,且井距越大非均匀布井的效果越好。根据研究结论最终确定布井方案为半缝长195 m、井距690 m、导流能力100 mD·m、缝间距50~60 m,并通过外侧两井中线的位置进行非均匀布井方案的调整。

As the block of East Xinzhao is about to be large scale developed,it is necessary to research the integral fracturing technology.The aspect of well layout scheme of well group and fracture parameters of single well were studied and evaluated based on the recovery of filed,earning rate of well group in elastic development reservoir.The well layout scheme and design were determined through production simulation.The fracture morphology was studied by fracturing propagation simulation.The results show that the well layout scheme should be concentrated in the middle of river sedimentation in order to improve the production of well group when the heterogeneity of reservoir is taken into consideration.The production of group of four wells is 94%of that of group of five wells.The larger the space of wells,the better of effect of production improvement is in the condition of heterogeneous reservoir.The optimization results in the end is fracture half-length of 195 m,well space of 690 m,conductivity of 100 mD·m,fracture space of 50~60 m.The adjustment of well layout scheme is based on the location of the center line of the two wells on the outside.