A Method for Determining the Contribution of Adsorption Gas to the Production of Shale Gas Wells
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摘要: 为解决页岩气生产过程中吸附气产出量对产气量的贡献率难以确定的问题，基于地层压力分布计算模型、吸附气产量计算模型和游离气计算模型，建立了考虑应力敏感、扩散和吸附等因素的多段压裂页岩气水平井吸附气产出量对产气量贡献率的确定方法，通过国内页岩气井验证了该方法的实用性。研究发现：利用该方法可分别计算得到生产过程中的地层压力分布、储量变化和吸附气与游离气产出量的变化；实例井吸附气原始储量约为游离气原始储量的30%，但由于Langmuir吸附压力（6 MPa）远低于该井目前的井底压力（12 MPa），吸附气解吸不明显；虽然该井已生产了25 000 h，但吸附气产出量对产气量的贡献率只是由开始生产时的9.0%上升到了10.5%，由此可见，国内部分页岩气藏虽然吸附气储量可观，但其对页岩气产量的贡献有限，且采出程度很低。研究认为，该方法可为页岩气井压裂后效果评价、产气量和动态储量评估提供理论参考。Abstract: A better method for determining the contribution rate of adsorption gas during the shale gas production after multi-stage fracturing,was developed that takes into consideration stress sensitivity,diffusion and adsorption according to three models,(i.e.formation pressure distribution computation model,adsorption gas production computation model and free gas production model).The goal was to develop a procedure for practical application in domestic shale gas wells.The results showed that the method could be used to calculate the formation pressure distribution,the change of dynamic reserves,output of adsorption gas and free gas.The results were also successful in that they show that although original reserve of adsorption gas accounts for about 30% of that of free gas,the desorption is not obvious due to the Langmuir adsorption pressure(6 MPa)is lower than the current bottom-hole pressure(12 MPa).Although this well has been put into production for 25 000 h,the adsorption gas production is only increased from initial 9.0% to 10.5% now.Somewhat surprisingly,research results indicated that the contribution of adsorption gas was limited in spite of its considerable reserves in some Chinese shale gas reservoirs,and ultimate recoverable reserves were very low.This method can provide some theoretical references for future improvements of the fracturing performance,and for better modeling of the production and dynamic reserves in a shale gas well.
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Keywords:
- shale gas /
- adsorption gas /
- free gas /
- production calculation /
- output contribution rate /
- dynamic gas reserve
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[1] KUUSKRAA V A.Unconventional natural gas:industry savior or bridge?[C]//EIA Energy Outlook and Modeling Conference,March 27,2006,Washington DC.
[2] 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. WANG Zhigang.Breakthrough of Fuling shale gas exploration and develpment and its inspiration[J].Oil Gas Geology,2015,36(1):1-6. [3] PANG Wei,WU Qiong,HE Ying,et al.Production analysis of one shale gas reservoir in China[R].SPE 174998,2015.
[4] PANG Wei,DU Juan,ZHANG Tongyi,et al.Production performance modeling of shale gas wells with non-uniform fractures based on production logging[R].SPE 181398,2016.
[5] CURTIS J B.Fractured shale-gas systems[J].AAPG Bulletin,2002,86(11):1921-1938.
[6] 刘洪林,邓泽,刘德勋,等.页岩含气量测试中有关损失气量估算方法[J].石油钻采工艺,2010,32(增刊1):156-158. LIU Honglin,DENG Ze,LIU Dexun,et al.Discussion on lost gas calculating methods in shale gas content testing[J].Oil Drilling Production Technology,2010,32(supplement1):156-158. [7] 赵群,王红岩,杨慎,等.一种计算页岩岩心解吸测试中损失气量的新方法[J].天然气工业,2013,33(5):30-34. ZHAO Qun,WANG Hongyan,YANG Shen,et al.A new method of calculating the lost gas volume during the shale core desorption test[J].Natural Gas Industry,2013,33(5):30-34. [8] 杨文新,李继庆,苟群芳.四川盆地焦石坝地区页岩吸附特征室内实验[J].天然气地球科学,2017,28(9):1350-1355. YANG Wenxin,LI Jiqing,GOU Qunfang.Experiment study on shale adsorption properties for Jiaoshiba shale,Sichuan Basin[J].Natural Gas Geoscience,2017,28(9):1350-1355. [9] 姜宝益,李治平,巨亚锋,等.修正的产量不稳定法预测页岩气动态储量[J].石油钻探技术,2012,40(2):66-69. JIANG Baoyi,LI Zhiping,JU Yafeng,et al.Prediction of dynamic reserves of shale gas with modified flow rate transient approach[J].Petroleum Drilling Techniques,2012,40(2):66-69. [10] 郝孝荣.页岩气层测井响应特征及其含气量评价[J].科技资讯,2012(28):84-85. HAO Xiaorong.Shale gas logging response characteristics and gas-content evaluation[J].Science Technology Information,2012(28):84-85. [11] 彭真,金武军.基于核磁共振测量的页岩气游离吸附比例关系确定:以涪陵页岩气储层为例[J].科学技术与工程,2017,17(29):227-232. PENG Zhen,JIN Wujun.Determination of proportion of shale free gas and absorbed based on NMR measurements:taking Fuling shale formation as an example[J].Science Technology and Engineering,2017,17(29):227-232. [12] 左罗,王玉普,熊伟,等.页岩含气量计算新方法[J].石油学报,2015,36(4):469-474,481. ZUO Luo,WANG Yupu,XIONG Wei,et al.A new method to calculate the shale gas content[J].Acta Petrolei Sinica,2015,36(4):469-474,481. [13] 姚军,孙海,樊冬艳,等.页岩气藏运移机制及数值模拟[J].中国石油大学学报(自然科学版),2013,37(1):91-98. YAO Jun,SUN Hai,FAN Dongyan,et al.Transport mechanisms and numerical simulation of shale gas reservoirs[J].Journal of China University of Petroleum(Edition of Natural Science),2013,37(1):91-98. [14] PAN Zhejun,CONNELL L D.Reservoir simulation of free and adsorbed gas production from shale[J].Journal of Natural Gas Science and Engineering,2015,22:359-370.
[15] 杨金辉,李立,李钟洋,等.滑脱和应力敏感效应对页岩气开发动态影响的数值模拟研究[J].石油钻探技术,2017,45(1):83-90. YANG Jinhui,LI Li,LI Zhongyang,et al.Numerical simulation on the effects of slippage and stress sensibility on the performance of shale gas development[J].Petroleum Drilling Techniques,2017,45(1):83-90. [16] 白玉湖,杨皓,陈桂华,等.页岩气产量递减典型曲线的不确定性分析方法[J].石油钻探技术,2013,41(4):97-100. BAI Yuhu,YANG Hao,CHEN Guihua,et al.An uncertainty analysis method on typical production decline curve for shale gas reservoirs[J].Petroleum Drilling Techniques,2013,41(4):97-100. [17] 李忠厚,吴小斌,DU Zhongwei,等.基于分形理论的页岩气分支水平井产能数学模型[J].石油钻采工艺,2017,39(1):7-13. LI Zhonghou,WU Xiaobin,DU Zhongwei,et al.A mathematical model for productivity calculation of shale gas multilateral horizontal wells based on fractal theory[J].Oil Drilling Production Technology,2017,39(1):7-13. [18] 桑宇,杨胜来,郭小哲,等.一种已压裂页岩气水平井的产量预测新方法[J].西南石油大学学报(自然科学版),2015,37(3):17-24. SANG Yu,YANG Shenglai,GUO Xiaozhe,et al.A new productivity prediction method for fractured horizontal wells in shale gas reservoirs[J].Journal of Southwest Petroleum University(Science Technology Edition),2015,37(3):17-24. [19] CHEN Zhiming,LIAO Xinwei,ZHAO Xiaoliang,et al.Performance of horizontal wells with fracture networks in shale gas formation[J].Journal of Petroleum Science and Engineering,2015,133:646-664.
[20] NOBAKHT M,CLARKSON C R,KAVIANI D.New type curves for analyzing horizontal well with multiple fractures in shale gas reservoirs[J].Journal of Natural Gas Science and Engineering,2013,10(1):99-112.
[21] 张建阔.页岩表面甲烷气吸附机理及影响因素研究[J].石油钻探技术,2017,45(2):101-106. ZHANG Jiankuo.The mechanism and influencing factors of methane adsorption on shale surfaces[J].Petroleum Drilling Techniques,2017,45(2):101-106. [22] LANGMUIR I.The adsorption of gases on plane surfaces of glass,mica andplatinum[J].Journal of the American Chemical Society,1918,40(9):1361-1403.
[23] PALMER I,MANSOORI J.How permeability depends on stress and pore pressure in coalbeds:a new model[J].SPE Reservoir Evaluation Engineering,1996,1(6):539-544.
[24] PEDROSA O A Jr.Pressure transient response in stress-sensitive formation[R].SPE 15115,1986.
[25] DU Juan,PANG Wei,LEI Jun,et al.Pressure transient analysis of shale gas wells with non-uniform fractures[R].SPE 183724,2017.
[26] JAVADPOUR F.Nanopores and apparent permeability of gas flow in mudrocks (shales and siltstone)[J].Journal of Canadian Petroleum Technology,2009,48(8):16-21.
[27] 吴克柳,李相方,陈掌星.页岩气纳米孔气体传输模型[J].石油学报,2015,36(7):837-848,889. WU Keliu,LI Xiangfang,CHEN Zhangxing.A model for gas transport through nanopores of shale gas reservoirs[J].Acta Petrolei Sinica,2015,36(7):837-848,889. [28] 牛聪,黄涛,王磊,等.页岩气开采中的井底压力并行计算[J].计算力学学报,2014,31(3):396-401. NIU Cong,HUANG Tao,WANG Lei,et al.Parallel computing for bottom-hole pressure in shale gas reservoir[J].Chinese Journal of Computational Mechanics,2014,31(3):396-401. [29] STEHFEST H.Algorithm 368:numerical inversion of Laplace transforms[J].Communications of the ACM,1970,13(1):47-49.
[30] PANG Wei,CHRISTINE A E,DU Juan,et al.Effect of well interference on shale gas well SRV interpretation[R].SPE 176910,2015.
[31] 沈金才,刘尧文.涪陵焦石坝区块页岩气井产量递减典型曲线应用研究[J].石油钻探技术,2016,44(4):88-95. SHEN Jincai,LIU Yaowen.Application study on typical production decline curves of shale gas wells in the Fuling Jiaoshiba Block[J].Petroleum Drilling Techniques,2016,44(4):88-95. -
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