涪陵焦石坝地区页岩气水平井压裂改造实践与认识

doi:10.11743/ogg20140318

摘要/Abstract

摘要：

水平井缝网压裂技术的应用大幅提高了涪陵焦石坝地区试验井组产量，促进了我国页岩气商业开发。在分析区块页岩储层构造及地质特征基础上，通过岩石力学参数测试和岩石矿物组分分析，评价了储层岩石脆性及其可压性。根据焦石坝地区五峰组-龙马溪组含气泥页岩段页岩有机质类型好、含气量高、脆性指数高的特点，以“复杂缝网+支撑主缝”为改造主体思路，增大页岩储层的改造体积为目标，优选了压裂材料，优化了压裂设计及配套工艺，确定了试验井组压裂改造工艺技术方法，形成了适用于涪陵焦石坝地区的页岩气水平井分段压裂改造技术。经过26口井的现场实施，效果显著，压裂井均获得了较高产能，平均单井无阻流量10.1×10⁴~155.8×10⁴ m³/d，证实了以“复杂缝网+支撑主缝”为改造主体的页岩气水平井分段压裂技术的有效性，为我国页岩气压裂改造积累了经验。

关键词: 水平井, 分段压裂, 页岩气, 龙马溪组, 志留系, 焦石坝地区

Abstract:

The application of advanced fracturing technology greatly increased shale gas production of pilot well group in Jiaoshiba of Fuling area,and improved commercial development of shale gas in China.Based on the analysis of shale reservoir architecture and geological characteristics,the brittleness and fracturability of reservoir rock were evaluated through rock mechanics parameter testing and mineral composition analysis.Shale in Wufeng-Longmaxi Formations is characterized by good organic matter type,high gas content and high brittleness index.According to the idea of "complex fracture network+main supporting fracture",and aiming at enlarging the volume of fractured shale reservoir,we selected most suitable materials for fracturing fluids,optimized fracturing design and related technologies,and determined the technolo-gical methods for fracturing of the pilot well group.Finally,a set of optimal staged fracturing technologies were developed and applied to the horizontal wells in Jiaoshiba of Fuling area.A total of 26 wells were fractured and obtained high open flow of gas in the range of 10.1×10⁴~155.8×10⁴ m³/d,verifying the effectiveness of these fracturing technologies.

Key words: Horizontal well, multi-stage fracturing, shale gas, Longmaxi Formation, Silurian, Jiaoshiba area

中图分类号:

TE348

王志刚. 涪陵焦石坝地区页岩气水平井压裂改造实践与认识[J]. 石油与天然气地质, 2014, 35(3): 425-430. doi: 10.11743/ogg20140318 Wang Zhigang. Practice and cognition of shale gas horizontal well fracturing stimulation in Jiaoshiba of Fuling area[J]. Oil & Gas Geology, 2014, 35(3): 425-430. doi: 10.11743/ogg20140318

参考文献

[1] King G E.Thirty years of gas shale fracturing:what have we learned? [J].SPE 133456,2010.
[2] Rickman R,Mullen M,Peter E,et al.A practical use of shale petrophysics for stimulation design optimization:all shale plays are not clones of the Barnett Shale [J].SPE 115258,2008.
[3] Wang Y,Miskimins J L.Experimental investigations of hy draulic fracture growth complexity in slick water fracturing treatments[J].SPE 137515,2010.
[4] Soliman M Y,East L,Augustine J.Fracturing design aimed at enhancing fracture complexity[J].SPE 130034,2010.
[5] Gale J,Holder J.Natural fractures in shales and their importance for gas production[C]//Tectonics studies Group annual Meeting,La Roche-en-Ardenne,Belgium,2008.
[6] Mayerhorfer M J,Lolonep,Warpinski N R,et al.What is stimulated rock volume?[C]//SPE Shale Gas Production Conference.Fort Worth,Texas,USA:SPE,2008.
[7] Cipolla C L,Warpinski N R,Mayerhorfer M J,et al.The relationship between fracture complexity,reservoir propertics,and fracture-treatment design[J].SPE 115769,2008.
[8] Glenn P,Andrei Z,Lakia C,Proppant and fluid selection to optimize performance of horizontal shale fracs [J].SPE 152119,2012.
[9] Chipperfields T,Wong J R,Warner D S,et al.Shear dilation diagnostics:a new approach for evaluating tight gas stimulation treatments[J].SPE 106289,2007
[10] 曾雨辰,杨保军,王冰凌.涪页HF-1井泵送易钻桥塞分段大型压裂技术[J].石油钻采工艺,2012,34(5):75-79. Zeng Yuchen,Yang Baojun,Wang Lingbing.Large-scale staged fracturing technology with pump-down drillable bridge plug for Well Fuye HF-1 [J].Oil Drilling﹠Production Technology,2012,34(5):75-79.
[11] Nilolas P,Roussel,Mukul M Shama.Optimizing fracture spacing and sequencing in hourizontal-well fracturing[J].SPE 127986,2010.
[12] Dong Z,.Holditch S A,Mcvay D A.Resource evaluatiaon for shale gas Reservoirs[R].SPE 152066,2012.
[13] Mendoza E,Aular J,Sousa L.Optimizing horizontal-well hydraulic-fracture spacing in the Eagle Ford[J].SPE 143681,2011.
[14] 刘伟,余谦,闫剑飞,等.上扬子地区志留系龙马溪组富有机质泥岩储层特征[J].石油与天然气地质,2012,33(3):346-352. Liu Wei,Yu Qian,Yan Jianfei,et al.Characteristics of organic-rich mudstone reservoirs in the Silurian Longmaxi Formation in Upper Yangtze region[J].Oil & Gas Geology,2012,33(3):346-352.
[15] 马文辛,刘树根,黄文明,等.四川盆地东南缘志留系古油藏特征及其油气勘探意义[J].石油与天然气地质,2012,33(3):432-441. Ma Wenxin,Liu Shugen,Huang Wenming,et al.Characteristics of Silurian Paleo-oil reservoirs and their significance for petroleum exploration on the southeast margin of Sichuan Basin[J].Oil & Gas Geology,2012,33(3):432-441.
[16] 周庆凡,杨国丰.致密油与页岩油的概念与应用[J].石油与天然气地质,2012,33(4):541-544. Zhou Qingfan,Yang Guofeng.Definition and application of tight oil and shale oil terms[J].Oil & Gas Geology,2012,33(4):541-544.
[17] 周德华,焦方正,郭旭升,等.川东南涪陵地区下侏罗统页岩油气地质特征[J].石油与天然气地质,2013,34(4):450-454. Zhou Dehua,Jiao Fangzheng,Guo Xusheng,et al.Geological features of the Lower Jurassic shale gas play in Fuling area,the southeastern Sichuan Basin[J].Oil & Gas Geology,2013,34(4):450-454.
[18] 苟波,郭建春.基于精细地质模型的大型压裂裂缝参数优化[J].石油与天然气地质,2013,34(6):809-815. Gou Bo,Guo Jianchun.Fracture parameter optimization of large hydraulic fracturing based on the fine geological model[J].Oil & Gas Geology,2013,34(6):809-815.