韩城矿区煤储层非稳态渗流压降传播规律
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摘要
为了探究煤层气开发过程中煤储层压降传播规律,通过耦合平面径向非稳态渗流模型及火柴棍模型,建立了排采初期单相水非稳态渗流模型,并利用MATLAB软件实现了韩城矿区不同层位储层压降漏斗传播三维成像,分析了压降传播规律及控制因素。研究表明:压降漏斗曲面顶部较为平缓,井筒附近骤然变陡,底部呈细长的锥状,流体能量主要消耗在近井地带。利用纵向压降与扩展距离及时间的比值λ将压降漏斗分为2类:位于3号煤层的W1井和位于11号煤层的W3井λ大于1.5×10~(-5)MPa/(m·d),压降漏斗横向扩展速度慢,持续以纵向加深为主,为Ⅰ类压降漏斗;位于5号煤层的W2井λ小于1.5×10~(-5)MPa/(m·d),整体以水平扩展为主,纵向加深较慢,为Ⅱ类压降漏斗。同时,λ越大,纵向加深越明显,λ越小,水平扩展越明显。在排水阶段,排水时间越长、排水速度越大、压降叠加越强、煤层厚度越小、初始孔渗条件越好,越有利于煤层气开发。
引文
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[4]陆辉,杨胜来,谢丽.低渗透油藏压降漏斗影响因素研究[J].科学技术与工程,2012,12(4):770-773.
[5]赵金,张遂安.煤层气排采储层压降传播规律研究[J].煤炭科学技术,2012,40(10):65-68.
[6]刘世奇,桑树勋,李梦溪,等.沁水盆地南部煤层气井网排采压降漏斗的控制因素[J].中国矿业大学学报,2012,41(6):943-950.
[7]李元建.中国煤层气产业开发利用现状及对策分析[J].中国矿业,2010,19(6):8-10.
[8]刘志强,胡汉月,史兵言,等.煤层气多分支水平井技术探讨[J].探矿工程,2011,38(6):6-9.
[9]Seidle J R,Huitt L G.Experimental measurement of coal matrix shrinkage due to gas desorption and implications for cleat permeability increases[C].International Meeting on Petroleum Engineering,Society of Petroleum Engineers,Beijing,China,1995.
[10]Palmer I,Mansoori J.How permeability depends on stress and pore pressure in coalbeds,a new model[C].SPE Annual Technical Conference and Exhibition,Denver,Colorado,1996.
[11]Palmer I,Mansoori J.Permeability depends on stress and pore pressure in coalbeds,a new model[J].SPE Reservoir Evaluation and Engineering,1998,1(6):539-544.
[12]Shi J Q,Durucan S.Drawdown induced changes in permeability of coalbeds:a new interpretation of the reservoir response to primary recovery[J].Transport in Porous Media,2004,56(1):1-16.
[13]张金亮,张金功,洪峰,等.鄂尔多斯盆地下二叠系深盆气藏形成的地质条件[J].天然气地球科学,2005,16(4):526-534.
[14]陈振宏,王勃,宋岩.韩城地区煤层气成藏条件评价[J].天然气地球科学,2006,17(6):868-869.
[15]张建国,雷光伦,张艳玉.油气层渗流力学[M].东营:石油大学出版社,2003:33-43.
[16]Pan Z J,Connell L D.Modeling permeability for coal reservoirs:a review of analytical models and testing data[J].International Journal of Coal Geology,2012,92:1-44.