大佛寺和胡家河4~#煤润湿性对比
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摘要
采用室内测定煤的吸—疏水特征实验、煤粉末浸透速度法实验及煤-水溶液界面接触角测定实验,研究了大佛寺与胡家河井田4~#煤体润湿性特征。实验结果显示,煤的吸—疏水特征实验表现为整体胡家河4~#煤样疏水速率高于大佛寺4~#煤样;煤粉末浸透速度法实验表现出大佛寺4~#煤样润湿高度一直处在胡家河之上;接触角测定结果证明胡家河4~#煤样的接触角均大于大佛寺4~#煤样。以上实验结果均表明大佛寺4~#煤润湿性要好于胡家河4~#煤。使用表面活性剂水溶液测定煤的接触角揭示了胡家河4~#煤的润湿性较大佛寺4~#煤更容易被改善。该项研究表明煤层气井压裂过程亦或是排采作业过程,对大佛寺4~#煤储层进行改造要保证预留足够长的时间,而胡家河煤层气的开发要借鉴大佛寺的成功经验,同时利用自身煤储层易疏水优势制定有利的排采制度;向压裂液中加入适当表面活性剂改良煤体润湿性,可以解决煤层气开发过程中出现的压裂液返排不彻底、前期排水时间过长等问题。
To study wettability of 4~# coal in Dafosi and Hujiahe Coalfield,a series of experiments have been conducted including the characteristics of hydrophilic-hydrophobic,experiment of coal powder penetration velocity and coal-water solution interface contact angle measurement.The results show that the overall hydrophobicity rate of 4~# Hujiahe coal sample is higher than that of 4~(# )Dafosi coal sample,the wetting height of 4~(# )Dafosi coal sample is always beyond of 4~# Hujiahe coal sample,and the contact angle of 4 ~# Hujiahe coal sample is larger than that of Dafosi 4 ~# coal sample.Comparison of experimental results find that wettability of 4~# coal in Dafosi Coalfield is better than that in Hujiahe coal mine.Measuring the contact angle of coal with surfactant aqueous solution reveals that the wettability of Hujiahe 4~# coal is easier to be improved than that of Dafosi 4~# coal.The contact angle measured by using solution to which has been added surface active agent revealed that the wettability of later is easy to be improved compared with the former.The results indicate that during fracturing and producing process,adequately long time should be reserved to improve the 4~# coal reservoir to improve the permeability and recovery efficiency of coalbed methane in Dafosi Coalfield.The development of coalbed methane in Hujiahe Coal Mine needs to draw on the successful experience from Dafosi CBM development and should take advantage of easy hydrophobic characteristic to formulate favorable production law.By adding appropriate surface active agent,the fracturing fluid can improve the wettability of coal,which can overcome the difficulties fracturing fluid flowback is not complete and the drainage time is too long in the early stage of coalbed methane development.
To study wettability of 4~# coal in Dafosi and Hujiahe Coalfield,a series of experiments have been conducted including the characteristics of hydrophilic-hydrophobic,experiment of coal powder penetration velocity and coal-water solution interface contact angle measurement.The results show that the overall hydrophobicity rate of 4~# Hujiahe coal sample is higher than that of 4~(# )Dafosi coal sample,the wetting height of 4~(# )Dafosi coal sample is always beyond of 4~# Hujiahe coal sample,and the contact angle of 4 ~# Hujiahe coal sample is larger than that of Dafosi 4 ~# coal sample.Comparison of experimental results find that wettability of 4~# coal in Dafosi Coalfield is better than that in Hujiahe coal mine.Measuring the contact angle of coal with surfactant aqueous solution reveals that the wettability of Hujiahe 4~# coal is easier to be improved than that of Dafosi 4~# coal.The contact angle measured by using solution to which has been added surface active agent revealed that the wettability of later is easy to be improved compared with the former.The results indicate that during fracturing and producing process,adequately long time should be reserved to improve the 4~# coal reservoir to improve the permeability and recovery efficiency of coalbed methane in Dafosi Coalfield.The development of coalbed methane in Hujiahe Coal Mine needs to draw on the successful experience from Dafosi CBM development and should take advantage of easy hydrophobic characteristic to formulate favorable production law.By adding appropriate surface active agent,the fracturing fluid can improve the wettability of coal,which can overcome the difficulties fracturing fluid flowback is not complete and the drainage time is too long in the early stage of coalbed methane development.
引文
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[2] 张群,崔永君,钟玲文,等.煤吸附甲烷的温度-压力综合吸附模型[J].煤炭学报,2008,33(11):1272-1278.ZHANG Qun,CUI Yong-jun,ZHONG Ling-wen,et al.Temperature pressure comprehensive adsorption model for coal adsorption of methane[J].Journal of China Coal Society,2008,33(11):1272-1278.
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[4] 苏现波,陈润,林晓英,等.吸附势理论在煤层气吸附/解吸中的应用[J].地质学报,2008,82(10):1382-1389.SU Xian-bo,CHEN Run,LIN Xiao-ying.et al.Application of adsorption potential theory in the fractionation of coalbed gas during the process of adsorption/desorption[J].Acta Geologica Sinica,2008,82(10):1382-1389.
[5] 张凯,汤达祯,陶树,等.不同变质程度煤吸附能力影响因素研究[J].煤炭科学技术,2017,45(5):192-197.ZHANG Kai,TANG Da-zhen,TAO Shu,et al.Study on influence factors of adsorption capacity of different metamorphic degree coals[J].Coal Science and Technology,2017,45(5):192-197.
[6] Busch A,Genst Erblum Y,Kross B M.Methane and CO2 sorption and desorption measurements on dry Argonne premium coals:pure components and mixture[J].International Journal of Coal Geology,2003,55(2-4):205-224.
[7] 张遂安,叶建平,唐书恒,等.煤对甲烷气体吸附-解吸机理的可逆性实验研究[J].天然气工业,2005,25(1):44-46.ZHANG Sui-an,YE Jian-ping,TANG Shu-heng,et al.Theoretical analysis of coal-methane adsorption/desorption mechanism and its reversibility experimental study[J].Natural Gas Industry,2005,25(1):44-46.
[8] 马东民,马薇,蔺亚兵.煤层气解吸滞后特征分析[J].煤炭学报,2012,37(11):1885-1889.MA Dong-min,MA Wei,LIN Ya-bing.Desorption hysteresis characteristics of CBM[J].Journal of China Coal Society,2012,37(11):1885-1889.
[9] 马东民,李来新,李小平,等.大佛寺井田4#煤CH4与CO2吸附解吸实验比较[J].煤炭学报,2014,39(9):1938-1944.MA Dong-min,LI Lai-xin,LI Xiao-ping,et al.Contrastive experiment of adsorption-desorption between CH4 and CO2 in Coal Seam 4 of Dafosi Coalmine[J].Journal of China Coal Society,2014,39(9):1938-1944.
[10] Orumwense F S.Estimation of the wettability of coal from contact angles using coagulants and flocculants[J].Fuel,1998,77(9-10):1107-1111.
[11] 赵振保,杨晨,孙春燕,等.煤尘润湿性的实验研究[J].煤炭学报,2011,36 (3):442-446.ZHAO Zhen-bao,YANG Chen,SUN Chun-yan,et al.Experimental study of coal dust wettability[J].Journal of China Coal Society,2011,36 (3):442-446.
[12] 程卫民,薛娇,周刚,等.基于红外光谱的煤尘润湿性[J].煤炭学报,2014,39(11):2256-2262.CHEN Wei-min,XUE Jiao,ZHOU Gang,et al.Study of coal dust wettability based on FTIR[J].Journal of China Coal Society,2014,39 (11):2256-2262.
[13] Semenova S A,Patrakov Yu F.Dependence of the water wettability of the surfaces of fossil coals on their structure and properties[J].Solid Fuel Chemistry,2017,51 (3):135-140.
[14] Solodyankin S S,Kolmakov N G,Manin N S,et al.Using a solution of the surfactant for increasing collection efficiency of coal dust in the exhaust system[J].Coke and Chemistry,2016,59 (9):333-337.
[15] 张劲松,武腾飞.综采工作面煤层注水降尘技术试验研究[J].煤炭技术,2016,35(10):173-175.ZHANG Jin-song,WU Teng-fei.Study on seam water injection and dust control technology of fully-mechanized caving face[J].Coal Technology,2016,35(10):173-175.
[16] 蒋仲安,王伟.降低爆破烟尘的降尘剂配方的实验研究[J].煤炭学报,2011,36(10):1720-1724.JIANG Zhong-an,WANG Wei.Research on optimal formula of dustfall agent to remove blasting smoke[J].Journal of China Coal Society,2011,36(10):1720-1726.
[17] 刘向君,熊健,梁利喜,等.川南地区龙马溪组页岩润湿性分析及影响讨论[J].天然气地球科学,2014,25 (10):1644-1652.LIU Xiang-jun,XIONG Jian,LIANG Li-xi,et al.Analysis of the wettability of Longmaxi Formation shale in the south region of Sichuan Basin and its influence[J].Natural Gas Geoscience,2014,25(10):1644-1652.
[18] 张涛,李相方,王永辉,等.页岩储层特殊性质对压裂液返排率和产能的影响[J].天然气地球科学,2017,28(6):828-838.ZHANG Tao,LI Xiang-fang,WANG Yong-hui,et al.Study on the effect of gas-shale reservoir special properties on the fracturing fluid recovery efficiency and production performance[J].Natural Gas Geoscience,2017,28 (6):828-838.
[19] 李春颖,张志全,林飞,等.压裂液在页岩储层中的滞留与吸收初步探索[J].科技通报,2016,32(8):31-35.LI Chun-ying,ZHANG Zhi-quan,LIN Fei,et al.Initial exploration of fracturing fluid retention in shale reservoirs[J].Bulletin of Science and Technology,2016,32(8):31-35.
[20] 王所良,王玉功,李志航.稠化水清洁压裂液返排液驱油技术[J].油田化学,2016,33(4):623-628.WANG Suo-liang,WANG Yu-gong,LI Zhi-hang.Oil displacement technology based on clean fracturing fluid flow-back water[J].Oilfield Chemistry,2016,33(4):623-628.
[21] 王生全,薛龙,马荷雯,等.大佛寺煤矿低煤阶煤层气地面开采选区评价[J].西安科技大学学报,2015,35(4):421-425.WANG Sheng-quan,XUE Long,MA He-wen,et al.Evaluation of selected target areas on CBM ground mining for low-rank coal of Dafosi coal mine[J].Journal of Xi’an University of Science and Technology,2015,35(4):421-425.
[22] 方世跃,刘震.胡家河井田原煤含硫特征及主控因素[J].西安科技大学学报,2017,37(3):339-345.FANG Shi-yue,LIU Zhen.Characteristics of sulfur content of raw coal and main controlling factors in Hujiahe mining field[J].Journal of Xi’an University of Science and Technology,2017,37(3):339-345.
[23] 谭天译.工业粉尘理化性质的测定方法[M].北京:化学工业出版社,1988.TAN Tian-yi.Measurement of industrial dust physio-chemical properties[M].Beijing:Chemical Industry Press,1988.
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