澳大利亚Bowen盆地M气田中煤阶煤层气水平井开发优化
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摘要
以澳大利亚Bowen盆地M气田中煤阶煤层气为例,依据渗透率和含气量,将储集层划分为4类,建立井组模型,提出相应的中煤阶煤层气水平井开发策略。针对Ⅰ类和Ⅱ类煤储集层渗透率较高,优化单井控制面积,采用与面割理垂直的单分支SIS水平井开发,后期加密,大幅减少钻井进尺、地面井口数;针对Ⅲ类煤储集层,考虑先期投产井对该区域压力的影响,适当增加单井控制面积,优化水平分支长度和夹角;Ⅳ类煤储集层渗透率较低,单井控制面积小,SIS水平井和MBL井开发效果均较差,建议暂不开发。
Taking M medium-rank coal bed methane(CBM) field of Bowen basin in Australia as an example,this paper proposed corresponding approaches for development of the medium-rank CBM by SIS(surface into seam) horizontal wells,based on the well group model developed by the reservoirs with four types of petrophysical properties classified by permeability and CBM content.For Type Ⅰ and TypeⅡ reservoirs with high permeability and high gas content,the approach is to optimize the well controlled area,design the horizontal wells that are perpendicular to cleat and put infill wells in the late stage of production,by which the drilling footage and well number can be greatly decreased.For Type Ⅲ reservoir with medium permeability and high gas content,the approach is to properly increase the well con-trolled area and optimize the branch length and angle of SIS wells by considering the influence of early production wells on the regional pressure in this area.For Type Ⅳ reservoir with low permeability and high gas content,the development effects by SIS well and multi-branch horizontal well are poor or uneconomical,due to the well controlled area is smaller,suggesting not to develop it at present.
Taking M medium-rank coal bed methane(CBM) field of Bowen basin in Australia as an example,this paper proposed corresponding approaches for development of the medium-rank CBM by SIS(surface into seam) horizontal wells,based on the well group model developed by the reservoirs with four types of petrophysical properties classified by permeability and CBM content.For Type Ⅰ and TypeⅡ reservoirs with high permeability and high gas content,the approach is to optimize the well controlled area,design the horizontal wells that are perpendicular to cleat and put infill wells in the late stage of production,by which the drilling footage and well number can be greatly decreased.For Type Ⅲ reservoir with medium permeability and high gas content,the approach is to properly increase the well con-trolled area and optimize the branch length and angle of SIS wells by considering the influence of early production wells on the regional pressure in this area.For Type Ⅳ reservoir with low permeability and high gas content,the development effects by SIS well and multi-branch horizontal well are poor or uneconomical,due to the well controlled area is smaller,suggesting not to develop it at present.
引文
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[2]苏现波,张丽萍,林晓英,等.煤阶对煤的吸附能力的影响[J].天然气工业,2005;25(1):19-21.Su Xianbo,Zhang Liping,Lin Xiaoying,et al.The influence of coalrank of adsorption capacity[J].Natural Gas Industry,2005,25(1):19-21.
[3]连承波,赵永军,李汉林,等.煤层含气量的主控因素及定量预测[J].煤炭学报,2005,30(6):726-729.Lian Chengbo,Zhao Yongjun,Li Hanlin,et al.Maincontrolling fac-tors analysis and prediction of coalbed gascontent[J].Journal of China Coal Society,2005,30(6):726-729.
[4]刘升贵,郝耐,王建强.煤层气水平井产能控制因素分析及排采实践[J].煤炭学报,2012,37(6):957-961.Liu Shenggui,Hao Nai,Wang Jianqiang.Productivity control factorsand extraction practice of coalbed methane horizontal well[J].Journalof China Coal Society,2012,37(6):957-961.
[5]张卫东,魏韦.煤层气水平井开发技术现状及发展趋势[J].中国煤层气,2008,5(4):19-22.Zhang Weidong,Wei Wei.Status of coalbed methane horizontal welltechnology and trend of development[J].China Coalbed Methane,2008,5(4):19-22.
[6]张健,汪志明,王开龙.煤层几何参数和渗透率对水平井开采煤层气的影响[J].石油钻探技术,2009,37(4):80-83.Zhang Jian,Wang Zhiming,Wang Kailong.Effects of coalbed geo-metric parameters and permeability on horizontal well production incoalbed methane reservoir[J].Petroeum Drilling Techniques,2009,37(4):80-83.
[7]Ray Williams,Eugene Yurakov.Gas related modelling of surface toin-seam wells[C].Brisbane,Austrilia:CSM(Coal Seam Methane),2003:1-18.
[8]Scott Thomson,Duncan MacDonald.Extended surface to seam drill-ing:design and control[R].2nd Annual National CSM-CMM Sum-mit Brisbane,Austrilia:CSM-CMM(Coal Seam Methane-Coal MineMethane),2004:1-9.
[9]鲜保安,夏柏如,张义,等.煤层气U型井钻井采气技术研究[J].油钻采工艺,2010,32(4):91-95.Xian Baoan,Xia Bairu,Zhang Yi,et al.Study on drilling and extrac-tion technologies for U-shape CBM wells[J].Oil Drilling&Produc-tinnTechnology,2010,32(4):91-95.
[10]房娜,姚约东,夏朝辉,等.中煤阶煤层气水平对接井开发效果与优化.新疆石油地质,2013,34(4):473-476.Fang Na,Yao Yuedong,Xia Zhaohui,et al.Performance analysisand optimization of SIS well for medium coal rank CBM develop-ment[J].Xinjinag Petroleum Geology,2013,34(4):473-476.
[11]桑浩田,桑树勋,周效志.沁水盆地南部煤层气井生产历史拟合与井网优化研究[J].山东科技大学学报:自然科学版,2011,30(4):58-65.Sang Haotian,Sang Shuxun,Zhou Xiaozhi.Production history fit-ting and well pattern optimization in coalbed methane well at south-ern part of Qinshui basin[J].Journal of Shandong University of Scienceand Technology:Natural Science Edition,2011,30(4):58-65.
[12]杨秀春,叶建平.煤层气开发井网部署与优化方法[J].中国煤层气,2008,5(1):13-17.Yang Xiuchun,Ye Jianping.Well pattern optimization design forCBM development[J].China Coalbed Methane,2008,5(1):13-17.
[13]史进,吴晓东.煤层气开发井网优化设计[J].煤田地质与勘察,2011,39(6):20-23.Shi Jin,Wu Xiaodong.Optimization design of CBM well grid pat-tern[J].Coal Geology&Exploration,2011,39(6):20-23.