Combined CBM drainage of multiple seams by single well in Enhong block, Yunnan Province
-
摘要: 云南恩洪区块属于多薄煤层发育区,煤层气资源丰富,但勘探开发程度较低。以恩洪区块煤层气井资料为基础,分析了前期单井产气量低的原因,探讨了多煤层合采的必要性及开发层系划分方式和单井开发潜力,进而结合流体可动性和国外煤层气开发经验,提出适合恩洪区块的煤层气开发方式。研究表明:恩洪区块单煤层资源丰度较低,前期煤层气井动用的资源不足是产气量低的重要原因;恩洪区块单井多煤层合采动用储量多,单井合采尽可能多的厚度大于0.5 m的原生-碎裂结构煤层是提高单井产气量的有效方式;恩洪区块煤层气吸附时间短,扩散能力强,但受地应力强度大、非均质性强和煤体结构复杂影响,渗透率较低且空间变化剧烈;分段压裂适合恩洪区块多薄煤层和弱含水的煤系地层特点,多煤层合采可依据煤层垂向上分布特点合理划分开发层系进行分段压裂合层排采,进行排水阶段缓降液面-见套压后憋压-稳产期稳压,之后缓慢降压的排采措施,最后形成各组整体降压提高产量。Abstract: With abundant coalbed methane (CBM) resources, Enhong block in Yunnan Province has trouble in developing CBM due to the multiple-thin coal seams. Based on CBM wells data, this paper focused on the necessity of multi-seam drainage through analyzing the resource abundance and EUR(estimated ultimate recovery), and then came up with some advice for development of Enhong block by referring the fluid mobility of coal seams and CBM development experience in the US. The study shows that the resource is not efficient enough trough drainage of only one seam by single well, which is also the reason of unsatisfactory gas production. On the other hand, the ultimate recovery resources of multiple coal seams are sufficient in Enhong CBM block, paving the way for necessity of multi-seams drainage in every single well. It is wise to drain all coal seams whose thickness are more than 0.5 m with native structure or cataclastic structure. Besides, the low desorption time is beneficial to drainage but the low permeability with intense variety will produce a negative effect on CBM development, which need to be overwhelmed through proper fracturing and drainage methods. Staged fracturing technology is appropriate in Enhong Block which is specialized by its multiple-thin coal seams and weak aquifer between coal-bearing formations, so much more CBM resources can be recovered. In addition, it is important to divide lots of coal seams into groups and drain each group from top to bottom when single vertical well drains multiple coal seams. Moreover, it is necessary to lower liquid level with a slow process when draining water from the coal seams and a high gas production could appear after a long time each coal seam had a reduction of formation pressure.
-
[1] KARACAN C O. Production history matching to determine reservoir properties of important coal groups in the upper Pottsville formation,Brookwood and Oak Grove fields,Black Warrior Basin,Alabama[J]. Journal of Natural Gas Science and Engineering,2013,10:51-67. [2] PASHIN J C. Variable gas saturation in coalbed methane reservoirs of the Black Warrior Basin:Implications for exploration and production[J]. International Journal of Coal Geology,2010, 82(3-4):135-146. [3] ZUBER M D. Production characteristics and reservoir analysis of coalbed methane reservoirs[J]. International Journal of Coal Geology,1998,38(1):27-45. [4] HANSON M E,NIELSEN P E,SORRELLS G G,et al. Design, execution and analysis of a stimulation to produce gas from thin multiple coal seams[C]//The 62nd Annual Technical Conference and Exhibition of the Society of Petroleum Engineers,27-30, September 1987,Dallas. SPE16860,Society of Petroleum Engineers,1987. [5] KIRR J N,EDDY G E,RAHSMA R,et al. Wenesburg college multiple coal seam methane extraction well[C]//Symposium on Unconventional Gas Recovery,18-21,May 1980,Pennsylvania. SPE8963,Society of Petroleum Engineers,1980. [6] 罗开艳,金军,赵凌云,等. 松河井田煤层群条件下合层排采煤层气可行性研究[J]. 煤炭科学技术,2016,44(2):73-77.LUO Kaiyan,JIN Jun,ZHAO Lingyun,et al. Feasibility study on combined seam gas drainage under condition of seam group in Songhe Mine Field[J]. Coal Science and Technology,2016, 44(2):73-77. [7] 周效志,桑树勋,易同生,等. 煤层气合层开发上部产层暴露的伤害机理[J]. 天然气工业,2016,36(6):52-59.ZHOU Xiaozhi,SANG Shuxun,YI Tongsheng,et al. Damage mechanism of upper exposed producing layers during CBM multi-coal seam development[J]. Natural Gas Industry,2016, 36(6):52-59. [8] 彭兴平,谢先平,刘晓,等. 贵州织金区块多煤层合采煤层气排采工作制度研究[J]. 煤炭科学技术,2016,44(2):39-44.PENG Xingping,XIE Xianping,LIU Xiao,et al. Study on combined coalbed methane drainage system of muti-seams in Zhijin Block,Guizhou[J]. Coal Science and Technology,2016, 44(2):39-44. [9] 许耀波. 顾桥井田煤层气井多煤层合采产量影响因素分析[J]. 煤田地质与勘探,2015,43(6):32-35.XU Yaobo,Influence factors of coalbed methane production rate of muti-coalbeds commingled production in Guqiao coal field[J]. Coal Geology& Exploration,2015,43(6):32-35. [10] 王朝栋,桂宝林,郭秀钦,等. 恩洪煤层气盆地构造特征[J]. 云南地质,2004,23(4):471-478.WANG Chaodong,GUI Baolin,GUO Xiuqin,et al. Techtonic characteristics of the seam gas in Enhong basin[J]. Yunnan Geology,2004,23(4):471-478. [11] 桂宝林. 黔西滇东煤层气地质与勘探[M]. 昆明:云南科学技术出版社,2001:9-87. [12] 贾高龙,莫日和,赖文奇,等. 云南恩洪-老厂煤层气勘查区地质特征及勘探开发策略[J]. 中国海上油气,2016,28(1):29-34.JIA Gaolong,MO Rihe,LAI Wenqi,et al. CBM geological characteristics and exploration and development strategy of Enhong-Laochang exploration blocks. Yunnan province[J]. China Offshore Oil and Gas,2016,28(1):29-34. [13] 李松,汤达祯,许浩,等. 云南恩洪和老厂地区煤储层孔隙-裂隙系统对比分析[J]. 高校地质学报,2012,18(3):516-521.LI Song,TANG Dazhen,XU Hao,et al. Comparative analysis of pore and fracture system of coal reservoirs from Enhong and Laochang districts,Yunnan[J]. Geological Journal of China Universities,2012,18(3):516-521. [14] 张金波,吴财芳. 恩洪矿区煤储层特征、含气特征及勘探开发建议[C]//叶建平,傅小康,李五忠,等. 2011年煤层气学术研讨会论文集,北京:地质出版社,2011:196-204. [15] 杨松,秦勇,申建,等. 恩洪向斜煤储层特性及其地质影响因素[J]. 中国煤层气,2010,7(5):18-20.YANG Song,QIN Yong,SHEN Jian,et al. Characteristic and geological controls of coal reservoirs in Enhong Syncline[J]. China Coalbed Methane,2010,7(5):18-20. [16] 易同生. 恩洪矿区煤层气富集的控制因素[J]. 矿物学报, 2007,27(3/4):493-498.YI Tongsheng. Factors controlling the accumulation of coalbed methane the Enhong coal mining district[J]. Acta Mineralogica Sinica,2007,27(3/4):493-498. [17] 赵俊龙,汤达祯,林文姬,等. 韩城矿区煤层气井分层合采产能特征及分布模式[J]. 煤炭科学技术,2015,43(9):80-86.ZHAO Junlong,TANG Dazhen,LIN Wenji,et al. Productive characteristics and distribution modes of multi-layer drainage coalbed methane wells in Hancheng Mining Area[J]. Coal Science and Technology,2015,43(9):80-86. [18] 杜希瑶,李相方,徐兵祥,等. 韩城地区煤层气多层合采开发效果评价[J]. 煤田地质与勘探,2014,42(2):28-34.DU Xiyao,LI Xiangfang,XU Bingxiang,et al. Multi-layer production evaluation of coalbed methane wells in Hancheng area[J]. Coal Geology & Exploration,2014,42(2):28-34. [19] 王有智. 珲春盆地低煤阶煤层气富集规律[J]. 煤田地质与勘探,2015,43(3):28-32.WANG Youzhi. Low rank enrichment of coalbed in Hunchun basin[J]. Coal Geology & Exploration,2015,43(3):28-32. [20] 吴凡. 利用测井曲线划分滇东地区煤体结构以及预测煤储层渗透率[J]. 石化技术,2017,24(4):131-133.WU Fan. Classification of coalbody structure and prediction of coal reservoir permeability with well logs in the easter region of Yunnan Provicne[J]. Petrochemical Industry Tech,2017,24(4):131-133. [21] 康永尚,王金,姜杉钰,等. 量化指标在煤层气开发潜力定量评价中的应用[J]. 石油学报,2017,38(6):18-25.KANG Yongshang,WANG Jin,JIANG Shanyu,et al. Application of quantitative indexes in quantitative evaluation of CBM development potential[J]. Acta Petrolei Sinica,2017,38(6):18-25. [22] 张群,降文萍. 我国低煤阶煤层气地面开发产气潜力研究[J]. 煤炭科学技术,2016,44(6):211-215.ZHANG Qun,JIANG Wenping. Study on coalbed methane surface development and production potential of low coal in China[J]. Coal Science and Technology, 2016, 44(6):211-215. [23] 丁安徐,龚月,叶建国. 贵州织金地区龙潭组煤层等温吸附特征研究及应用[J]. 油气藏评价与开发,2011,1(3):76-80.DING Anxu,GONG Yue,YE Jianguo. Research and application of isothermal adsorption characteristics of the coal beds of Longtan formation in Zhijin,Guizhou[J]. Reservoir Evaluation and Development,2011,1(3):76-80. [24] PAUL G W. Simulating coalbed methane reservoirs[C]//SAULSBERRY J L,PAUL S,SCHRAUFNAGEL R A. A guide to coalbed methane reservoir engineering. GRI,1996:266-314. [25] MAVOR M J. Coalbed methane reservoir properties[C]//SAULSBERRY J L,PAUL S,SCHRAUFNAGEL R A. A guide to coalbed methane reservoir engineering. GRI,1996:86-148. [26] AMINIAN K,RODVELT G. Evaluation of coalbed methane reservoirs[C]//THAKUR P,SCHATZEL S,AMINIAN K. Coal bed methane-from prospect to pipeline. Holland:2014,Elsevier:63-91. [27] 李,康永尚,姜杉钰,等喆. 沁水盆地高煤阶煤吸附时间主要影响因素分析[J]. 煤炭科学技术,2017,45(2):115-121.LI Zhe,KANG Yongshang,JIANG Shanyu,et al. Analysis on major factors affected to adsorption time of high rank coal in Qinshui basin[J]. Coal Science and Technology,2017,45(2):115-121. [28] 徐宏杰,桑树勋,易同生,等. 黔西地应力场特征及构造成因[J]. 中南大学学报(自然科学版),2014,45(6):1960-1965.XU Hongjie, SANG Shuxun, YI Tongsheng, et al. Characteristics of in-situ stress field and its tectonic origin in Western Guizhou[J]. Journal of Central South University (Sicence and Technology),2014,45(6):1960-1965. [29] 康永尚,孙良忠,张兵,等. 中国煤储层渗透率分级方案探讨[J]. 煤炭学报,2017,42(增刊1):186-194.KANG Yongshang,SUN Liangzhong,ZHANG Bing,et al. Discussion on classification of coal reservoir permeability in China[J]. Journal of China Coal Society,2017,42(S1):186-194. [30] SALMACHI A,KARACAN C O. Cross-formational flow of water into coalbed methane reservoirs:controls on relative permeability curve shape and production profile[J]. Environmental Earth Sciences,2017,76(200):2-16. [31] 康永尚,张兵,鱼雪,等. 沁水盆地寿阳区块煤层气排采动态成因机理及排采对策[J]. 天然气地球科学,2017,28((1):116-126.KANG Yongshang,ZHANG Bing,YU Xue,et al. Formation mechanism of well performance and CBM development strategy in Shouyang Block, Qinshui Basin[J]. Natural Gas Geoscience, 2017,28(1):116-126. [32] 康永尚,王金,姜杉钰,等. 煤层气井排采动态主控地质因素分析[J]. 地质论评,2016,62(6):1511-1520.KANG Yongshang,WANG Jin,JIANG Shanyu,et al. Analysis on controlling geological factors influencing drainage performances of CBM wells[J],Geological Review,2016,62(6):1511-1520. [33] 姜杉钰,康永尚,张守仁,等. 沁水盆地柿庄区块煤层气井排采动态影响因素分析及开发对策研究[J]. 天然气地球科学, 2016,27(6):1134-1142.JIANG Shanyu,KANG Yongshang,ZHANG Shouren,et al. Analysis on influencing factors of drainage dynamic of wells and CBM development strategy in Shizhuang Block[J]. Natural Gas Geoscience,2016,27(6):1134-1142. [34] 康永尚,陈晶,张兵,等. 沁水盆地寿阳勘探区煤层气井排采水源层识别[J]. 煤炭学报,2016,41(9):2263-2272.KANG Yongshang,CHEN Jing,ZHANG Bing,et al. Indetification of aquifers influencing the drainage of coalbed methane wells in Shouyang exploration area,Qinshui basin[J]. Journal of China Coal Society,2016,41(9):2263-2272. [35] U. S. Department of Energy, National Energy Technology Laboratory-2003/1193. Multi-seam well completion technology:Implications for Powder River Basin coalbed methane production[R]. September,2003:1-13. [36] 康永尚,赵群,王红岩,等. 煤层气井开发效率及排采制度的研究[J]. 天然气工业,2007,27(7):79-82.KANG Yongshang,ZHAO Qun,WANG Hongyan,et al. Developing efficiency and the working system or wells during the de-watering gas production process in coalbed methane reservoirs[J]. Natural Gas Industry,2007,27(7):79-82. [37] 康永尚,邓泽,刘洪林. 我国煤层气井排采工作制度探讨[J]. 天然气地球科学,2008,19(3):423-426.KANG Yongshang,DENG Ze,LIU Honglin. Discussion about the CBM well draining technology[J]. Natural Gas Geoscience, 2008,19(3):423-426.
点击查看大图
计量
- 文章访问数: 125
- HTML全文浏览量: 40
- PDF下载量: 14
- 被引次数: 0