昭通国家级页岩气示范区YS108区块小井距错层开发模式探讨
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摘要
针对川南山地页岩气储层具有平面稳定连续、纵向厚度大、非均质强的特点,合理的井网部署模式对于提高储量动用程度和采收率具有重要意义。为此,借鉴国内外页岩气生产经验,根据研究区静态地质特征和生产动态特征,以非常规水力裂缝模拟和数值模拟为分析手段,建立昭通国家级页岩气示范区YS108区块龙马溪组龙一段小井距错层开发模式:平面上将井距缩小至300m、纵向上龙一_1~1小层和龙一_1~3小层错层动用、上下2套井网开发、"拉链式"压裂、同步投产的开发模式。结果表明:该模式在研究区内试验可新增20%储量动用,提高16%的采收率,新增单井产量0.9×10~8m~3,井间干扰是该模式应用的关键因素,采用同步投产的方式可减少井间干扰至2%以下。
Shale gas reservoir in mountainous areas of southern Sichuan Province is stable and continuous in plane but highly heterogeneous in vertical,so a reasonable well pattern model is significant for improving the degree of reserve utilization and gas recovery ratio.Therefore,by learning other fields' experience in producing shale gas,and using the static geological information and dynamic production data,a development mode of smaller well spacing and horizontal well target within staggered bed is established in the 1~(st) member of Longmaxi Formation(L1)of YS108 block in Zhaotong Area,with some analytical means such as unconventional hydro-fracture simulation and numerical simulation:The well spacing is reduced to 300 m,and the target of the horizontal wells should be in the staggered layers which are L1_1~1 and L1_1~3 horizons,so the well pattern is divided into two parts;In addition,"zipper"fracturing and synchronous production are also the important parts of this development mode.Through researching,the results show that this model can increase 20%reserves utilization,16% gas recovery ratio and 90×10~6m~3 gas production in each single well.However,inter-well interference is the key factor to the application of this model and it can be reduced to less than 2% by synchronous production.
Shale gas reservoir in mountainous areas of southern Sichuan Province is stable and continuous in plane but highly heterogeneous in vertical,so a reasonable well pattern model is significant for improving the degree of reserve utilization and gas recovery ratio.Therefore,by learning other fields' experience in producing shale gas,and using the static geological information and dynamic production data,a development mode of smaller well spacing and horizontal well target within staggered bed is established in the 1~(st) member of Longmaxi Formation(L1)of YS108 block in Zhaotong Area,with some analytical means such as unconventional hydro-fracture simulation and numerical simulation:The well spacing is reduced to 300 m,and the target of the horizontal wells should be in the staggered layers which are L1_1~1 and L1_1~3 horizons,so the well pattern is divided into two parts;In addition,"zipper"fracturing and synchronous production are also the important parts of this development mode.Through researching,the results show that this model can increase 20%reserves utilization,16% gas recovery ratio and 90×10~6m~3 gas production in each single well.However,inter-well interference is the key factor to the application of this model and it can be reduced to less than 2% by synchronous production.
引文
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[15]Qian Bin,Zhang Juncheng,Zhu Juhui,et al.Application of zipper fracturing of horizontal cluster wells in the Changning shale gas pilot zone,Sichuan Basin[J].Natural Gas Industry,2015,35(1):81-84.钱斌,张俊成,朱炬辉,等.四川盆地长宁地区页岩气水平井组“拉链式”压裂实践[J].天然气工业,2015,35(1):81-84.
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[18]Portis D H,Bello H,Murray M,et al.Searching for the Optimal Well Spacing in the Eagle Ford Shale:Apractical Tool-Kit[C].Unconventional Resources Technology Conference,Denver,2013:237-244.
[19]Liang B,Du M,Yanez P P.Subsurface well spacing optimization in the Permian Basin[J].Journal of Petroleum Science and Engineering,2019,174:235-243.
[20]Wang Junlei,Jia Ailin,Wei Yunsheng,et al.Pseudo steady productivity evaluation and optimization for horizontal well with multiple finite conductivity fractures in gas reservoirs[J].Journal of China University of Petroleum:Edition of Natural Science,2016,40(1):100-107.王军磊,贾爱林,位云生,等.有限导流压裂水平气井拟稳态产能计算及优化[J].中国石油大学学报:自然科学版,2016,40(1):100-107.
[2]Virues C,Lypkie K,Pyecroft J,et al.Going from conceptual to analytical drilling/completions/reservoir guided model of a cased uncemented multi-fractured horizontal well in the canadian horn river basin[C].SPE/CSUR Unconventional Resources Conference,Calgary,2015:1-58.
[3]He Dongbo,Wang Lijuan,Ji Guang,et al.Well spacing optimization for Sulige tight sand gas field,NW China[J].Petroleum Exploration and Development,2012,39(4):458-464.何东博,王丽娟,冀光,等.苏里格致密砂岩气田开发井距优化[J].石油勘探与开发,2012,39(4):458-464.
[4]Li Hua.Enlightenment from ordinary-pressure shale fracturing development in North America[J].Journal of Jianghan Petroleum University of Staff and Workers,2018,31(5):28-31.李华.北美常压页岩压裂开发的启示[J].江汉石油职工大学学报,2018,31(5):28-31.
[5]Zhai Guangming,Song Jianguo,Jin Jiuqiang,et al.Plate Tectonic Evolution and Formation and Evaluation of Petroleum Bearing Basins[M].Beijing:Petroleum Industry Press,2002:260-276.翟光明,宋建国,勒久强,等.板块构造演化与含油气盆地形成与评价[M].北京:石油工业出版社,2002:260-276.
[6]Zhang Chunming,Zhang Weisheng,Guo Yinghai.Sedimentary environment and its effect on hydrocarbon source rocks of Longmaxi Formation in southeast Sichuan and northern Guizhou[J].Earth Science Frontiers,2012,1(1):136-145.张春明,张维生,郭英海.川东南-黔北地区龙马溪组沉积环境及对烃源岩的影响[J].地学前缘,2012,19(1):136-145.
[7]Wu Kunyu,Zhang Tingshan,Yang Yang,et al.Geological characteristics of Wufeng-Longmaxi shale-gas reservoir in the Huangjinba Gasfield,Zhaotong national shale gas demonstrationarea[J].Geology in China,2016,43(1):275-287.伍坤宇,张廷山,杨洋,等.昭通示范区黄金坝气田五峰组-龙马溪组页岩气储层地质特征[J].中国地质,2016,43(1):275-287.
[8]Wei Yunsheng,Wang Junlei,Qi Yadong,et al.Optimization of shale gas well pattern and spacing[J].Natural Gas Industry,2018,38(4):129-137.位云生,王军磊,齐亚东,等.页岩气井网井距优化[J].天然气工业,2018,38(4):129-137.
[9]Zhou Shouwei,Jiang Wei,Zhang Chunyang,et al.The enlightenment on shale gas exploration and development in China getting from Eagle Ford in American[J].Engineering Scinences,2012,14(6):16-21.周守为,姜伟,张春阳,等.美国Eagle Ford页岩气开发对我国页岩气勘探开发的启示[J].中国工程科学,2012,14(6):16-21.
[10]Liang Xing,Wang Gaocheng,Zhang Jiehui,et al.High-efficiency integrated shale gas development model of Zhaotong National demonstration zone and its practical enlightenment[J].China Petroleum Exploration,2017,22(1):29-37.梁兴,王高成,张介辉,等.昭通国家级示范区页岩气一体化高效开发模式及实践启示[J].中国石油勘探,2017,22(1):29-37.
[11]Wang Zhigang.Breakthrough of Fuling shale gas exploration and development and its inspiration[J].Oil&Gas Geology,2015,36(1):1-6.王志刚.涪陵页岩气勘探开发重大突破与启示[J].石油与天然气地质,2015,36(1):1-6.
[12]Jia Ailin,Wei Yunsheng,Jin Yiqiu.Progress in key technologies for evaluating marine shale gas development in China[J].Petroleum Exploration and Development,2016,43(6):949-955.贾爱林,位云生,金亦秋.中国海相页岩气开发评价关键技术进展[J].石油勘探与开发,2016,43(6):949-955.
[13]Yu W,Wu K,Zuo LH,et al.Physical models for inter-well interference in shale reservoirs:Relative impacts of fracture hits and matrix permeability[C]∥Unconventional Resources Technology Conference,1-3August 2016,San Antonio,Texas,USA.San Antonio:Unconventional Resources Technology Conference,2016:1535-1558.
[14]Guo Xiaozhe,Zhou Changsha.Seepage numerical model for fractured horizontal well in shale gas reservoir[J].Journal of Southwest Petroleum University:Scicece&Technology Edition,2014,36(5):90-96.郭小哲,周长沙.页岩气藏压裂水平井渗流数值模型的建立[J].西南石油大学学报:自然科学版,2014,36(5):90-96.
[15]Qian Bin,Zhang Juncheng,Zhu Juhui,et al.Application of zipper fracturing of horizontal cluster wells in the Changning shale gas pilot zone,Sichuan Basin[J].Natural Gas Industry,2015,35(1):81-84.钱斌,张俊成,朱炬辉,等.四川盆地长宁地区页岩气水平井组“拉链式”压裂实践[J].天然气工业,2015,35(1):81-84.
[16]Awada A,Santo M,Lougheed D,et al.Is that interference:Awork flow for identifying and analyzing communication through hydraulic fractures in a multiwall pad[J].SPE Journal,2016,21(5):1554-1556.
[17]Yu Rongze,Zhang Xiaowei,Bian Yanan,et al.Flow mechanism of shale gas reservoirs and influential factors of their productivity[J].Natural Gas Industry,2012,32(9):10-15.于荣泽,张晓伟,卞亚南,等.页岩气藏流动机理与产能影响因素分析[J].天然气工业,2012,32(9):10-15.
[18]Portis D H,Bello H,Murray M,et al.Searching for the Optimal Well Spacing in the Eagle Ford Shale:Apractical Tool-Kit[C].Unconventional Resources Technology Conference,Denver,2013:237-244.
[19]Liang B,Du M,Yanez P P.Subsurface well spacing optimization in the Permian Basin[J].Journal of Petroleum Science and Engineering,2019,174:235-243.
[20]Wang Junlei,Jia Ailin,Wei Yunsheng,et al.Pseudo steady productivity evaluation and optimization for horizontal well with multiple finite conductivity fractures in gas reservoirs[J].Journal of China University of Petroleum:Edition of Natural Science,2016,40(1):100-107.王军磊,贾爱林,位云生,等.有限导流压裂水平气井拟稳态产能计算及优化[J].中国石油大学学报:自然科学版,2016,40(1):100-107.