高速通道压裂技术及其现场应用

THE HIGH SPEED CHANNEL FRACTURING TECHNOLOGY AND IT’S FIELD APPLICATION

针对常规加砂压裂工艺裂缝内压降高、支撑剂分布连续、砂堵风险大的问题,结合大牛地气田致密砂岩储层低孔、低渗、低压的特点,提出了一种新型压裂工艺——高速通道加砂压裂技术。通过对岩石力学、支撑剂导流能力、支撑剂在压裂液段塞中的稳定性及开放性通道进行评价,并对纤维加量、铺砂浓度剖面和加砂规模优化,以及对纤维降解和纤维加注配套技术优化,最后优选出纤维加入浓度约为4‰,压裂液用量降低39%,支撑剂用量降低44%,施工水马力降低了33%,脉冲时间间隔为1.5-2.5min。××水平井采用高速通道压裂技术,压后初期裂缝导流能力得到了极大的提高,喜获无阻流量为6.53×10^4m^3/d的高产气流,取得了较好的试验效果。该技术的现场应用将对致密低渗透砂岩气藏的开发提供技术保障。

In view of high pressure drop in cracks, continuous distribution for proppant and high sand plug risks using conventional sand fracturing technology and in conjunction with the characteristics of low porosity, low permeability, low pressure of Daniudi gas field tight sandstone reservoirs, this paper presents a new fracturing technique of the high speed channel sand fracturing technology. The rock mechanics, proppant diverting capacity, the stability and open channel of proppant in fracturing liquid slug are evaluated, the fiber added amount, sanding concentration profile and sand-carried capacity are optimized, the fiber degradation and filling technology are also optimized. At last, optimized results are as follows: the fiber concentration was 4 per thousand, fracturing fluid volume decreased by 39%, supporting agent lowered by 44%, water power is reduced by 33%, the pulse duration is 1.5-2.5 min. Using high speed channel fracturing technology, the initial fracture diverting capacity has been greatly improved after fracturing in ×× horizontal well. It awarded high flow 6.53×10^4m^3/d and achieved a good test results. The field application of this technology will provide technical support for tight and low permeability sandstone gas reservoir.