利用灰色关联法分析低渗气藏压裂影响因素

Analysis on influencing factors of postfracture response in low permeability gas reservoir with gray correlation method

聂玲 周德胜 郭向东 惠建军 边疆 高利军

西安石油大学石油工程学院，陕西 西安 710065 延长石油集团公司油气勘探公司，陕西 延安 716000

School of Petroleum Engineering, Xi′an Shiyou University, Xi′an 710065, China Petroleum Exploration Company, Yanchang Petroleum Group Company, Yan′an 716000, China

水力压裂工艺是低渗透气田的一项主要增产措施。影响气层压后效果的因素有很多，分析各影响因素对压裂后无阻流量的影响程度，对改善压裂开发效果和提高单井产量具有重要意义。文中利用灰色关联法，对鄂尔多斯盆地盒8低渗透气层的29口压裂井进行分析，研究结果表明：影响压后产量的主要因素依次为储层渗透率、砂量、排量和气层厚度；在其他条件相同的情况下，优选渗透率高、气层厚度大的压裂井，在合理的范围内采用较大的排量和砂量进行压裂施工，能获取较高的产能。文中研究方法为压裂效果影响因素的量化分析提供了新的思路，所得结论为低渗透气层的压裂设计和效果评价提供了可靠的依据。

Hydraulic fracturing is a major stimulation approach in the development of low permeability gas reservoir. There are many factors which affect postfracture response. Analyzing the effect of these factors on open flow capacity is of great significance in improving postfracture response and increasing the single well production rate. Based on gray relevance analysis method, this paper had analyzed 29 fractured wells in the He 8 low permeability reservoir of Ordos Basin. The result shows that the major influencing factors on the productivity are successively reservoir permeability, proppant amount, pumping rate and gas zone thickness. When the other reservoir conditions are same, through optimizing the fractured wells which have the high reservoir permeability and great pay zone thickness and using the great pumping rate and proppant amount within reason in the process of fracturing operation, the high production rate can be achieved. The research provides a new quantitative analysis method for evaluating the influencing factors on postfracture response and presents the reliable basis for fracturing design and result evaluation in low permeability gas reservoir.

10.6056/dkyqt201301034