寿阳区块煤层气采收率预测方法及井间距优化
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摘要
为准确预测煤层气采收率和确定煤层气井开采合理的井间距,对数值模拟法、类比法、等温吸附法、解析法及其各自的适用条件和优缺点做了详细分析,结合3种采收率的预测方法得出了15#、9#、3#煤层的采收率;阐述了煤层气开发中井间距的设计原则,根据寿阳区块的地质和煤储层条件,设计3种不同的井间距方案,通过数值模拟预测产能,分析了井间距与产能之间的关系,得出合理的井间距;阐述了丛式井组设计开发概念思想.研究结果表明:合理的井间距为350 m×350 m,15#煤层的采收率为53.9%,9#煤层采收率为51.6%,3#煤层的采收率为47.8%.
In order to accurately predict coalbed methane(CBM) recovery rate, this paper analyzed in great detail their applicable conditions, merits and drawbacks of numerical simulation method, analogy method, isothermal adsorption method and analytic method. The recovery rate of NO.15 coal seam, NO.9 coal seam and NO.3 coal seam was obtained by combining 3 recovery rate prediction methods. The design principle of the well spacing for CBM development was described. According to the geology and coal reservoir condition in Shouyang block, this paper designed 3 different well spacing schemes and analyzed the relationship between the well spacing and capacity through productivity prediction by numerical simulation, and finally obtained the reasonable well spacing. The results show that the most reasonable well spacing is 350m×350m, the recovery rate of NO.15 coal seam is 53.9%, and the recovery rate of NO.9 coal seam is 51.6%, and the recovery rate of NO.3 coal seam is 47.8%.
In order to accurately predict coalbed methane(CBM) recovery rate, this paper analyzed in great detail their applicable conditions, merits and drawbacks of numerical simulation method, analogy method, isothermal adsorption method and analytic method. The recovery rate of NO.15 coal seam, NO.9 coal seam and NO.3 coal seam was obtained by combining 3 recovery rate prediction methods. The design principle of the well spacing for CBM development was described. According to the geology and coal reservoir condition in Shouyang block, this paper designed 3 different well spacing schemes and analyzed the relationship between the well spacing and capacity through productivity prediction by numerical simulation, and finally obtained the reasonable well spacing. The results show that the most reasonable well spacing is 350m×350m, the recovery rate of NO.15 coal seam is 53.9%, and the recovery rate of NO.9 coal seam is 51.6%, and the recovery rate of NO.3 coal seam is 47.8%.
引文
[1]李明宅,孙晗森.煤层气采收率预测技术[J].天然气工业,2008,28(3):25-29.Li Mingzhai,Sun Hansen.Methods of prediction CBM recovery factor[J].Natural Gas Industry,2008,28(3):25-29.
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[8]王晓梅,张群,张培河,等.煤层气储层数值模拟研究的应用[J].天然气地球科学,2004,15(6):664-668.Wang Xiaomei,Zhang Qun,Zhang Peihe,et al.Application of coalbed methane reservoir simulation[J].Natural Gas Geoscience,2004,15(6):664-668.
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[12]周尚忠,张文忠.当前我国煤层气采收率估算方法及存在问题[J].中国煤层气,2011,8(4):9-12.Zhang Shangzhong,Zhang Wenzhong.The current methods for estimating recovery rate of CBM and the exiting problems in China[J].China Coalbed Methane,2011,8(4):9-12.
[13]桑浩田,桑树勋,周效志,等.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,2011,20(4):58-65.Sang Haotian,Sang Shuxun,Zhou Xiaozhi,et al.Production history fitting and well pattern optimization in coalbed methane well at Southern part of Qinshui basin[J].Journal of Shangdong of Science and Technology:Natural Science,2011,20(4):58-65.
[14]拜文华,赵庆波,刘锐娥.山西沁水煤层气田采收率预测[J].现代地质,2001(4):438-444.Bai Wenhua,Zhao Qingbo,Liu Rui’e.Predicting the recovery efficiency of Qinshui coalbed methane field Shanxi province[J].Geoscience,2001(4):438-444.
[15]乔磊,申瑞臣,黄洪春,等.沁水盆地南部低成本煤层气钻井完井技术[J].石油勘探与开发,2008,35(4):482-486.Qiao Lei,Shen Ruichen,Huang Hongchun,et al.Low cost drilling and completion techniques for coalbed methane in southern Qinshui basin[J].Petroleum Exploration and Development,2008,35(4):482-486.
[2]孟召平.煤层气开发地质学理论与方法[M].北京:科学出版社,2010.Meng Zhaoping.Coalbed Methane Exploitation Geology Theory and Method[M].Beijing:Science Press,2010.
[3]刘长久,谭旭.铁法盆地煤层气采收率分析[J].中国煤炭,2009,35(6):5-9.Liu Changjiu,Tan Xu.Study on the CBM recovery rate in Tiefa coal basin[J].China Coal,2009,35(6):5-9.
[4]张培河,李贵红,李建武.煤层气采收率预测方法评述[J].煤田地质与勘探,2006,34(5):26-30.Zhang Peihe,Li Guihong,Li Jianwu.The review on the predictive methodology of coalbed methane recovery efficiency[J].Coal Geology&Exploration,2006,34(5):26-30.
[5]孟召平,田永东,李国富.沁水盆地南部储层渗透性与地应力之间关系和控制机理[J].自然科学进展,2009,19(10):1 142-1 148.Meng Zhaoping,Tian Yongdong,Li Guofu.The relationship between permeability and ground stress in coal seam and control mechanism in southern Qinshui basin[J].Progress in Natural Science,2009,19(10):1 142-1 148.
[6]刘燕红,李梦溪,杨鑫,等.沁水盆地樊庄区块煤层气高产富集规律及开发实践[J].天然气工业,2012,32(4):29-32.Liu Yanhong,Li Mengxi,Yang Xin,et al.Laws of coalbed methane enrichment and high productivity in the Fanzhuang block of the Qinshui basin and development practices[J].Natural Gas Industry,2012,32(4):29-32.
[7]郑玉柱,韩宝山.煤层气采收率的影响因素及确定方法[J].天然气工业,2005,25(1):120-123.Zheng Yuzhu,Han Baoshan.Affecting factors and estimating methods of recovery percent of coalbed gas[J].Natural Gas Industry,2005,25(1):120-123.
[8]王晓梅,张群,张培河,等.煤层气储层数值模拟研究的应用[J].天然气地球科学,2004,15(6):664-668.Wang Xiaomei,Zhang Qun,Zhang Peihe,et al.Application of coalbed methane reservoir simulation[J].Natural Gas Geoscience,2004,15(6):664-668.
[9]陶树,汤达祯,许浩,等.沁南煤层气井产能因素分析及开发建议[J].煤炭学报,2011,36(2):194-198.Tao Shu,Tang Dazhen,Xu Hao,et al.Analysis on influence factors of coalbed methane wells productivity and development proposals in southern Qinshui basin[J].Journal of China Coal Society,2011,36(2):194-198.
[10]刘升贵,陈含,彭智高,等.沁水盆地煤层气产能差异及采收率[J].辽宁工程技术大学学报:自然科学版,2013,32(6):721-724.Liu Shenggui,Chen Han,Peng Zhigao,et al.Coalbed methane productivity differences and gas recovery in Qinshui basin[J].Journal of Liaoning Technical University:Natural Science,2013,32(6):721-724.
[11]刘升贵,郝耐,王建强.煤层气水平井压降漏斗扩展规律研究[J].辽宁工程技术大学学报:自然科学版,2012,31(1):8-11.Liu Shenggui,Hao Nai,Wang Jianqiang.Pressure drop funned extension of coalbed methane horizontal well[J].Journal of Liaoning Technical University:Natural Science,2012,31(1):8-11.
[12]周尚忠,张文忠.当前我国煤层气采收率估算方法及存在问题[J].中国煤层气,2011,8(4):9-12.Zhang Shangzhong,Zhang Wenzhong.The current methods for estimating recovery rate of CBM and the exiting problems in China[J].China Coalbed Methane,2011,8(4):9-12.
[13]桑浩田,桑树勋,周效志,等.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,2011,20(4):58-65.Sang Haotian,Sang Shuxun,Zhou Xiaozhi,et al.Production history fitting and well pattern optimization in coalbed methane well at Southern part of Qinshui basin[J].Journal of Shangdong of Science and Technology:Natural Science,2011,20(4):58-65.
[14]拜文华,赵庆波,刘锐娥.山西沁水煤层气田采收率预测[J].现代地质,2001(4):438-444.Bai Wenhua,Zhao Qingbo,Liu Rui’e.Predicting the recovery efficiency of Qinshui coalbed methane field Shanxi province[J].Geoscience,2001(4):438-444.
[15]乔磊,申瑞臣,黄洪春,等.沁水盆地南部低成本煤层气钻井完井技术[J].石油勘探与开发,2008,35(4):482-486.Qiao Lei,Shen Ruichen,Huang Hongchun,et al.Low cost drilling and completion techniques for coalbed methane in southern Qinshui basin[J].Petroleum Exploration and Development,2008,35(4):482-486.