Sensitivity Analysis of Production in Fractured Shale Gas Reservoirs
-
摘要: 考虑气体渗流、解吸附效应、储层压缩性和滑脱效应,建立了页岩裂缝系统产能的全耦合数学模型.采用有限元方法求解基质和裂缝流场,计算结果与已有的研究结果吻合,验证了模型的正确性.在此基础上,分析了裂缝半长、条数、间距等参数对产能的影响以及解吸附效应对产能的作用.结果表明:裂缝参数之间存在相互作用.裂缝半长对产能的影响最大,裂缝条数的优化与裂缝半长有关;在生产中后期,解吸附效应可以提供相当可观的气体产量,对稳定产能有重要意义.该模型可以为页岩压裂设计提供理论指导.Abstract: In view of gas seepage and effect of desorption, shale compressibility and slippage effect, the full coupling mathematical model for production of the fracture system in shale gas reservoirs was established. The matrix and fracture flow field was solved with the finite element method. The simulation results were consistent with the published field data from the Barnett Shale in the Newark East field. Based on this model, the effects of the fracture’s half length, number, spacing and gas desorption on gas production were simulated. The numerical results show that the fracture parameters are interactive. The influence of the half length on production enhancement is dominant. The optimal number of fractures is related to the fracture’s half length. In the middle and late parts of the gas production period, the effect of desorption provides considerable production. The presented model makes an effective theoretical tool for the optimization of shale fracturing design.
-
Key words:
- shale gas /
- fracture system /
- effect of desorption /
- finite element method
-
[1] WU Yu-shu, Moridis G J, BAI Bao-jun, ZHANG Ke-ni. A multi-continuum model for gas production in tight fractured reservoirs[C]// SPE Hydraulic Fracturing Technology Conference .The Woodlands, Texas: Society of Petroleum Engineers, 2009: SPE-118944-MS. [2] 孙海, 姚军, 孙致学, 樊冬艳. 页岩气数值模拟技术进展及展望[J]. 油气地质与采收率, 2012,19(1): 46-49.(SUN Hai, YAO Jun, SUN Zhi-xue, FAN Dong-yan. The research situation and prospect of numerical simulation in shale gas fracturing[J].Petroleum Geology and Recovery Efficiency,2012,19(1): 46-49.(in Chinese)) [3] ZHANG Xu, DU Chang-an, Deimbacher F, Crick M, Harikesavanallur A. Sensitivity studies of horizontal wells with hydraulic fractures in shale gas reservoirs[C]// International Petroleum Technology Conference.Doha, Qatar: International Petroleum Technology Conference, 2009: IPTC-13338-MS. [4] Cipolla C L, Lolon E, Mayerhofer M J. Reservoir modeling and production evaluation in shale-gas reservoirs[C]//International Petroleum Technology Conference.Doha, Qatar: International Petroleum Technology Conference, 2009: IPTC-13185-MS. [5] Cipolla C L, Lolon E, Mayerhofer M J, Warpinski N. Fracture design considerations in horizontal wells drilled in unconventional gas reservoirs[C]// SPE Hydraulic Fracturing Technology Conference.The Woodlands, Texas: Society of Petroleum Engineers, 2009: SPE-119366-MS. [6] YU Wei, Luo Z, Javadpour F, Varavei A, Sepehrnoori K. Sensitivity analysis of hydraulic fracture geometry in shale gas reservoirs[J].Journal of Petroleum Science and Engineering,2014,113: 1-7. [7] 姚同玉, 黄延章, 李继山. 页岩中页岩气渗流系数计算模型[J]. 应用数学和力学, 2014,35(8): 939-948.(YAO Tong-yu, HUANG Yan-zhang, LI Ji-shan. Calculation model for the permeability coefficient of shale gas in shale matrix[J].Applied Mathematics and Mechanics,2014,35(8): 939-948.(in Chinese)) [8] Kalantari D A, Mohaghegh S D. A new practical approach in modelling and simulation of shale gas reservoirs application to New Albany Shale[J].International Journal of Oil, Gas and Coal Technology,2010,4(2): 104-133. [9] Langmuir I. The adsorption of gases on plane surfaces of glass, mica and platinum[J].Journal of the American Chemical Society,1918,40(9): 1361-1403. [10] Klinkenberg L J. The permeability of porous media to liquids and gases[J].Drilling and Production Practice,1941,2(2): 200-213. [11] WU Yu-shu, Pruess K, Persoff P. Gas flow in porous media with Klinkenberg effects[J].Transport in Porous Media,1998,32(1): 117-137. [12] Jones F O, Owens W W. A laboratory study of low-permeability gas sands[J].Journal of Petroleum Technology,1980,32(9): 1631-1640. [13] Butt S D, Frempong P K, Mukherjee C, Upshall J. Characterization of the permeability and acoustic properties of an outburst-prone sandstone[J].Journal of Applied Geophysics,2005,58(1): 1-12. [14] COMSOL. Comsol multiphysics user’s guide[Z]. COMSOL Inc, 2012. [15] Grieser B, Shelley B, Soliman M. Predicting production outcome from multi-stage, horizontal Barnett completions[C]// SPE Production and Operations Symposium.Oklahoma City, Oklahoma: Society of Petroleum Engineers, 2009: SPE-120271-MS. [16] Abaa K, Wang J Y, Ityokumbul M T. Parametric study of fracture treatment parameters for ultra-tight gas reservoirs[J].Journal of Petroleum Exploration and Production Technology,2013,3(3): 159-168. [17] Cohen C E, Abad C, Weng X, England K, Phatak A, Kresse O, Nevvonen O, Lafitte V, Abivin P. Analysis on the impact of fracturing treatment design and reservoir properties on production from shale gas reservoirs[C]//International Petroleum Technology Conference.Beijing, China: International Petroleum Technology Conference, 2013: IPTC-16400-MS. [18] Leahy D A, Das M, Agarwal A, Kaminsky R D. Modeling of transport phenomena and multicomponent sorption for shale gas and coalbed methane in an unstructured grid simulator[C]//SPE Annual Technical Conference and Exhibition.Denver, Colorado, USA: Society of Petroleum Engineers, 2009: SPE-147352-MS. [19] Mengal S A, Wattenbarger R A. Accounting for adsorbed gas in shale gas reservoirs[C]//SPE Middle East Oil and Gas Show and Conference.Manama, Bahrain: Society of Petroleum Engineers, 2011: SPE-141085-MS. [20] Cipolla C L, Lolon E P, Erdle J C, Rubin B. Reservoir modeling in shale-gas reservoirs[J].SPE Reservoir Evaluation & Engineering,2010,13(4): 638-653.
点击查看大图
计量
- 文章访问数: 1031
- HTML全文浏览量: 102
- PDF下载量: 2660
- 被引次数: 0