水合物钻井液微观结构热传导分形模型研究  

A Fractal Model of Heat Conduction for the Drilling Fluid Microstructure in Hydrate Formation

作　　者：韩博[1] 李承中[1] 范勇[2] 姜淼 

机构地区：[1]中水北方勘测设计研究有限责任公司,天津320222 [2]福建省建筑科学研究院,福建福州350025 [3]中铁隧道勘测设计院有限公司,天津300133

出　　处：《地质与勘探》2012年第4期829-834,共6页Geology and Exploration

摘　　要：在水合物勘探开发过程中,钻井液除常规作用外,还必须具有抑制水合物分解与再生成的作用。钻井液的这些宏观作用由其内部微观结构所决定,而水合物的分解和生成与介质的传热过程有关。由于钻井液微观结构与多孔介质相似,故其传热过程也相似。利用多孔介质的性质及其传热理论,系统分析了水合物钻井液微观结构与多孔介质的异同,探讨了水合物在钻井液中的分解特性。接着阐述了分形理论,对钻井液微观结构的传热分形模型进行了研究。最后得出钻井液中水合物分解的传热过程,建立了钻井液微观结构的一维热传导分形模型,并得出有效导热系数的分形表达式。In the process of the exploration and development of natural gas hydrate,drilling fluid should have the function of restraining the disassociation and regeneration of hydrate,besides the conventional functions.The macro-functions of drilling fluid are decided by its inner structure,and the disassociation and regeneration of hydrate are related to the heat transfer course of the media.As the microstructures of drilling fluid are similar to porous media,their heat transfer process is also similar.Using the heat transfer properties and theory of porous media,this paper analyzed the similarities and differences between drilling fluid and porous media,discussed the disassociation properties of hydrate in the drilling fluid,and studied the heat conduction fractal model for the drilling fluid microstructure.In conclusion,we obtained the heat conduction process of hydrate disassociation,established a one-dimensional heat conduction fractal model of drilling fluid microstructures,and got the fractal expression of effective coefficient for heat conduction.

关 键 词：水合物 钻井液微观结构 热传导 分形 

分 类 号：TK124[动力工程及工程热物理—工程热物理]