贾长贵, 路保平, 蒋廷学, 李真祥. DY2HF深层页岩气水平井分段压裂技术[J]. 石油钻探技术, 2014, 42(2): 85-90. DOI: 10.3969/j.issn.1001-0890.2014.02.017
引用本文: 贾长贵, 路保平, 蒋廷学, 李真祥. DY2HF深层页岩气水平井分段压裂技术[J]. 石油钻探技术, 2014, 42(2): 85-90. DOI: 10.3969/j.issn.1001-0890.2014.02.017
Jia Changgui, Lu Baoping, Jiang Tingxue, Li Zhenxiang. Multi-Stage Horizontal Well Fracturing Technology in Deep Shale Gas Well DY2HF[J]. Petroleum Drilling Techniques, 2014, 42(2): 85-90. DOI: 10.3969/j.issn.1001-0890.2014.02.017
Citation: Jia Changgui, Lu Baoping, Jiang Tingxue, Li Zhenxiang. Multi-Stage Horizontal Well Fracturing Technology in Deep Shale Gas Well DY2HF[J]. Petroleum Drilling Techniques, 2014, 42(2): 85-90. DOI: 10.3969/j.issn.1001-0890.2014.02.017

DY2HF深层页岩气水平井分段压裂技术

Multi-Stage Horizontal Well Fracturing Technology in Deep Shale Gas Well DY2HF

  • 摘要: DY2HF井是位于川东南丁山构造、目的层为龙马溪组海相页岩气的重点探井,具有高温、超高应力的特点。为解决该井压裂作业存在的施工压力高和加砂困难等难题,开展了深层页岩气水平井分段压裂技术研究。根据丁山页岩特征和地应力状态,进行了井口施工压力预测和排量优化,建立了水平井段多裂缝覆盖率计算模型,并结合诱导应力场计算结果进行了段簇优化。根据页岩气网络压裂技术的特点及该井的具体情况,确定采用高减阻低伤害滑溜水和活性胶液进行混合压裂,采用低密度高强度覆膜支撑剂进行组合加砂,并对压裂参数进行了模拟优化。DY2HF井分段压裂井口限压95 MPa,施工总液量29 516 m3,总砂量319 m3,最高排量13.6 m3/min,滑溜水减阻率达78%,胶液完全水化,压裂后获得高产工业气流,实现了深层页岩气水平井压裂技术突破。该井分段压裂结果表明,丁山等深层页岩气已经具备了有效勘探开发的技术基础。

     

    Abstract: Well DY2HF is a key exploration well in Dingshan Longmaxi marine shale gas reservoir featuring in high temperature and ultra high stress.In order to overcome the challenge of high injection pressure and difficult proppant injection,multi-stage fracturing technology of horizontal well in the deep shale gas reservoir has been developed.According to the characteristics of Dingshan shale,wellhead injection pressure and pumping rate were optimized,mutiple fracture coverage ratio model for horizontal section was established,and fracturing stages and clusters were optimized on the basis of induced stress analysis result.According to the demands of shale gas network fracturing technology and specific characteristics of this well,high friction reduction and low damage hybrid fluid of slick water and low surfactant tension gel was used as fracturing fluid,together with low-density and high-strength coated ceramic proppant in combined meshes.Fracturing parameters were also optimized through numerical simulation.DY2HF deep shale gas horizontal well fracturing was successfully performed under the limited wellhead pressure,95 MPa,with a cumulative fracturing fluid volume of 29,516 m3,cumulative proppant volume of 319 m3,maximum pumping rate of 13.6 m3/min,friction reduction rate of slick water of up to 78%,and complete hydration of post-frac gel.Industrial gas production was reached,which marked a breakthrough in multi-stage horizontal well fracturing of deep shale gas reservoirs.The treatment result indicates that deep shale gas reservoirs like Dingshan are capable of being effectively developed under the present fracturing technology and equipment.

     

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