Prediction of coal structure using particle size characteristics of coalbed methane well cuttings
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摘要
Severely deformed coal seams barely deliver satisfactory gas production. This research was undertaken to develop a new method to predict the positions of deformed coals for a horizontal CBM well. Firstly, the drilling cuttings of different structure coals were collected from a coal mine and compared. In light of the varying cuttings characteristics for different structure coals, the coal structure of the horizontally drilled coal seam was predicted. And the feasibility of this prediction method was discussed. The result shows that exogenetic fractures have an important influence on the deformation of coal seams. The hardness coefficient of coal decreases with the deformation degree in the order of primary structural, cataclastic and fragmented coal. And the expanding-ratio of gas drainage holes and the average particle size of cuttings increase with the increase of the deformation degree. The particle size distribution of coal cuttings for the three types of coals is distinctive from each other. Based on the particle size distribution of cuttings from X-2 well in a coal seam, six sections of fragmented coal which are unsuitable for perforating are predicted. This method may benefit the optimization of perforation and fracturing of a horizontal CBM well in the study area.
Severely deformed coal seams barely deliver satisfactory gas production. This research was undertaken to develop a new method to predict the positions of deformed coals for a horizontal CBM well. Firstly, the drilling cuttings of different structure coals were collected from a coal mine and compared. In light of the varying cuttings characteristics for different structure coals, the coal structure of the horizontally drilled coal seam was predicted. And the feasibility of this prediction method was discussed. The result shows that exogenetic fractures have an important influence on the deformation of coal seams. The hardness coefficient of coal decreases with the deformation degree in the order of primary structural, cataclastic and fragmented coal. And the expanding-ratio of gas drainage holes and the average particle size of cuttings increase with the increase of the deformation degree. The particle size distribution of coal cuttings for the three types of coals is distinctive from each other. Based on the particle size distribution of cuttings from X-2 well in a coal seam, six sections of fragmented coal which are unsuitable for perforating are predicted. This method may benefit the optimization of perforation and fracturing of a horizontal CBM well in the study area.
Severely deformed coal seams barely deliver satisfactory gas production. This research was undertaken to develop a new method to predict the positions of deformed coals for a horizontal CBM well. Firstly, the drilling cuttings of different structure coals were collected from a coal mine and compared. In light of the varying cuttings characteristics for different structure coals, the coal structure of the horizontally drilled coal seam was predicted. And the feasibility of this prediction method was discussed. The result shows that exogenetic fractures have an important influence on the deformation of coal seams. The hardness coefficient of coal decreases with the deformation degree in the order of primary structural, cataclastic and fragmented coal. And the expanding-ratio of gas drainage holes and the average particle size of cuttings increase with the increase of the deformation degree. The particle size distribution of coal cuttings for the three types of coals is distinctive from each other. Based on the particle size distribution of cuttings from X-2 well in a coal seam, six sections of fragmented coal which are unsuitable for perforating are predicted. This method may benefit the optimization of perforation and fracturing of a horizontal CBM well in the study area.
引文
[1]Gas Geology Lab of Jiaozuo Mining Institute.Introduction to gas geology.Beijing:Coal Industry Press;1991.
[2]Fu XH,Jiang B,Qi Y,Ye SZ,Zhang YG,Zeng QH.Identifying coal structure and forecast of coal reservoir permeability using well logs.J Well Logging Technol2003;27(2):140-3.
[3]Chen Y,Tang DZ,Xu H,Lv YM,Chen TG.The distribution of coal structure in Hancheng based on well logging data.J China Coal Soc 2013;38(8):1435-42.
[4]Hou YH,Yao YB,Yang YH,Cai YD,Chen Y.Discriminate method of coal structure based on correspondence analysis technology:a case study in the Anze area,Qinshui Basin.J China Coal Soc 2016;41(8):2041-9.
[5]Xu H,Tang DZ,Mathews JP,Zhao JL,Li S.Evaluation of coal macrolithotypes distribution by geophysical logging data in the Hancheng Block,Eastern Margin,Ordos Basin,China.Int J Coal Geol 2016;165:265-77.
[6]Ai L,Zhou MC,Zhang J,Liang X,Qian BW,Liu DR.Quantitative identification of coal structure based on coal rock brittleness index by logging data.Lithologic Reservoirs 2017;29(02):139-44.
[7]Sheng X,Liang Y.The use of coal cuttings from underground boreholes to determine gas content of coal with direct desorption method.Int J Coal Geol2017;174:1-7.
[8]Zhou B,Hatherl P,Sun W.Enhancing the detection of small coal structures by seismic diffraction imaging.Int J Coal Geol 2017;178:1-12.
[9]Tang YY,Zhang GC,Sun SQ.Distributive feature of f value of different coal body structure coal.J Jiaozuo Ins Technol(Nat Sci)2004;23(2):81-4.
[10]Wang P,Su XB,Han Y,Fan C,Zhang YZ.Quantitative characterization of coal structure and its significance.Saf Coal Mines 2014;45(11):12-5.
[11]Po LN.Ultimate stress of coal seam.Mini Translat;1983.
[12]Petuhov IM.Rock burst of coal.Beijing:China Coal Industry Publishing House;1984.
[13]Liu JL.Study on the particle size distribution of drilling cuttings produced by horizontal directional drilling in underground coal mine.Min Res Develop2015;35(4):53-5.
[14]Turcotte DL.Fractals and fragmentation.Geophys Res 1986;91(B2):1921-6.
[15]Li SB,Yan T,Li W.Fractal representation of rock drill ability.Acta Petrolei Sinica 2006;27(1):124-7.
[16]Li SB,Li W.Feasibility analysis of fractal characteristics of rock drill ability.JDaqing Petro Ins 2006;30(3):24-7.
[17]Tang JP,Chen S,Yu N.Study on the drilling cuttings bits index of coal and gas outburst based on average effective stress.Prog Geophys 2017;32(1):395-400.
[18]Wang SW,Wang FM,Hou GJ,Wu XM,Zhang C,Zhang YC,et al.CBMdevelopment well type for steep seam in Fukang Baiyanghe mining area,Xinjiang.J China Coal Soc 2014;39(9):1914-8.
[19]He TC,Qin Y.Coalbed gas exploration and development and utilization technology.Xuzhou:China University of Mining and Technology Press;2007.
[20]Guo R,Mannhardt K,Kantzas A.Laboratory investigation on the permeability of coal during primary and enhanced coalbed methane production.J Canad Petrol Technol 2008;47(10):27-32.
[21]Wang SW,Duan LX,Zhang M,Chen LC,Zhou CM.The principle and technical methods and application of coal reservoir’s evaluation.Wuhan:China University of Geosciences Press;2012.
[22]Hu Q,Wang SW,Zhang C,He JH,Liu JH,Zhang XF.Coal structure affected to coalbed methane development in Qinnan region.Coal Sci Technol 2014;42(8):65-74.
[23]Zhong LW,Yuan ZR,Li GH,Jin XL.The relationship between coal structure and permeability in main coal bearing areas in China.Coal Geol Expl 2004;32(S1):77-81.
[24]Li S.Coal reservoir property differences analysis of different coal structure.In:Proceedings of the symposium on CBM;2011.
[25]Li GQ,Meng ZP,Li JR.Characteristics of methane diffusion in coal matrix and its effect on gas production.Earth Sci 2017;42(8):1356-63.
[26]Shen HM,Mao TL,Zhang LL.Research on reasonable sealing hole depth of extraction borehole based on drilling cuttings theory.Saf Coal Mines 2014;45(8).39-41,45.
[27]Xie HP,Zhao XP,Liu JF,Zhang R,Xue DJ.Influence of different mining layouts on the mechanical properties of coal.Int J Min Sci Technol 2012;22(6):749-55.
[28]Tang JR,Lu YY,Ge ZL,Xia BW,Sun HJ,Du P.A new method of combined rock drilling.J Min Sci Technol 2014;24(1):1-6.
[29]Zhang ZY,Nemcik J,Ren T,Zhang J.Influence of void space on microscopic behavior of fluid flow in rock joints.Int J Min Sci Technol 2014;24(3):335-40.
[30]Zhao JF,Wang SW,Qin Y,Zhao WX,Chen WW,Yang J,et al.Characteristics and origin of coal powder in coalbed methane well.Nat Gas Geosci 2013;24(6):1316-20.
[31]Chen LC,Wang SW,He JH,Zhang YC,Hu Q,Lv SF.The impact of coal fines collection on hydraulic fracturing effect.J.China Univ Min Technol 2015;44(3):526-31.
[2]Fu XH,Jiang B,Qi Y,Ye SZ,Zhang YG,Zeng QH.Identifying coal structure and forecast of coal reservoir permeability using well logs.J Well Logging Technol2003;27(2):140-3.
[3]Chen Y,Tang DZ,Xu H,Lv YM,Chen TG.The distribution of coal structure in Hancheng based on well logging data.J China Coal Soc 2013;38(8):1435-42.
[4]Hou YH,Yao YB,Yang YH,Cai YD,Chen Y.Discriminate method of coal structure based on correspondence analysis technology:a case study in the Anze area,Qinshui Basin.J China Coal Soc 2016;41(8):2041-9.
[5]Xu H,Tang DZ,Mathews JP,Zhao JL,Li S.Evaluation of coal macrolithotypes distribution by geophysical logging data in the Hancheng Block,Eastern Margin,Ordos Basin,China.Int J Coal Geol 2016;165:265-77.
[6]Ai L,Zhou MC,Zhang J,Liang X,Qian BW,Liu DR.Quantitative identification of coal structure based on coal rock brittleness index by logging data.Lithologic Reservoirs 2017;29(02):139-44.
[7]Sheng X,Liang Y.The use of coal cuttings from underground boreholes to determine gas content of coal with direct desorption method.Int J Coal Geol2017;174:1-7.
[8]Zhou B,Hatherl P,Sun W.Enhancing the detection of small coal structures by seismic diffraction imaging.Int J Coal Geol 2017;178:1-12.
[9]Tang YY,Zhang GC,Sun SQ.Distributive feature of f value of different coal body structure coal.J Jiaozuo Ins Technol(Nat Sci)2004;23(2):81-4.
[10]Wang P,Su XB,Han Y,Fan C,Zhang YZ.Quantitative characterization of coal structure and its significance.Saf Coal Mines 2014;45(11):12-5.
[11]Po LN.Ultimate stress of coal seam.Mini Translat;1983.
[12]Petuhov IM.Rock burst of coal.Beijing:China Coal Industry Publishing House;1984.
[13]Liu JL.Study on the particle size distribution of drilling cuttings produced by horizontal directional drilling in underground coal mine.Min Res Develop2015;35(4):53-5.
[14]Turcotte DL.Fractals and fragmentation.Geophys Res 1986;91(B2):1921-6.
[15]Li SB,Yan T,Li W.Fractal representation of rock drill ability.Acta Petrolei Sinica 2006;27(1):124-7.
[16]Li SB,Li W.Feasibility analysis of fractal characteristics of rock drill ability.JDaqing Petro Ins 2006;30(3):24-7.
[17]Tang JP,Chen S,Yu N.Study on the drilling cuttings bits index of coal and gas outburst based on average effective stress.Prog Geophys 2017;32(1):395-400.
[18]Wang SW,Wang FM,Hou GJ,Wu XM,Zhang C,Zhang YC,et al.CBMdevelopment well type for steep seam in Fukang Baiyanghe mining area,Xinjiang.J China Coal Soc 2014;39(9):1914-8.
[19]He TC,Qin Y.Coalbed gas exploration and development and utilization technology.Xuzhou:China University of Mining and Technology Press;2007.
[20]Guo R,Mannhardt K,Kantzas A.Laboratory investigation on the permeability of coal during primary and enhanced coalbed methane production.J Canad Petrol Technol 2008;47(10):27-32.
[21]Wang SW,Duan LX,Zhang M,Chen LC,Zhou CM.The principle and technical methods and application of coal reservoir’s evaluation.Wuhan:China University of Geosciences Press;2012.
[22]Hu Q,Wang SW,Zhang C,He JH,Liu JH,Zhang XF.Coal structure affected to coalbed methane development in Qinnan region.Coal Sci Technol 2014;42(8):65-74.
[23]Zhong LW,Yuan ZR,Li GH,Jin XL.The relationship between coal structure and permeability in main coal bearing areas in China.Coal Geol Expl 2004;32(S1):77-81.
[24]Li S.Coal reservoir property differences analysis of different coal structure.In:Proceedings of the symposium on CBM;2011.
[25]Li GQ,Meng ZP,Li JR.Characteristics of methane diffusion in coal matrix and its effect on gas production.Earth Sci 2017;42(8):1356-63.
[26]Shen HM,Mao TL,Zhang LL.Research on reasonable sealing hole depth of extraction borehole based on drilling cuttings theory.Saf Coal Mines 2014;45(8).39-41,45.
[27]Xie HP,Zhao XP,Liu JF,Zhang R,Xue DJ.Influence of different mining layouts on the mechanical properties of coal.Int J Min Sci Technol 2012;22(6):749-55.
[28]Tang JR,Lu YY,Ge ZL,Xia BW,Sun HJ,Du P.A new method of combined rock drilling.J Min Sci Technol 2014;24(1):1-6.
[29]Zhang ZY,Nemcik J,Ren T,Zhang J.Influence of void space on microscopic behavior of fluid flow in rock joints.Int J Min Sci Technol 2014;24(3):335-40.
[30]Zhao JF,Wang SW,Qin Y,Zhao WX,Chen WW,Yang J,et al.Characteristics and origin of coal powder in coalbed methane well.Nat Gas Geosci 2013;24(6):1316-20.
[31]Chen LC,Wang SW,He JH,Zhang YC,Hu Q,Lv SF.The impact of coal fines collection on hydraulic fracturing effect.J.China Univ Min Technol 2015;44(3):526-31.