煤层气分子成泡的微观过程研究  

A Study on Micro Process of Coalbed Methane Molecules' Bubble Formation

作　　者：张硕[1] 杨平[2] 

机构地区：[1]中国石油大学石油工程学院,北京102249 [2]里贾纳大学石油工程系

出　　处：《河北师范大学学报（自然科学版）》2012年第5期497-501,共5页Journal of Hebei Normal University：Natural Science

基　　金：国家973项目(2009CB219606)

摘　　要：运用化学理论对煤层气分子(主要成分为甲烷)在地层水的溶解和成泡过程进行了描述,对成泡过程的受力与做功进行分析,并结合生产实际讨论了温度、生产压差、地层水矿化度、压力降和孔隙介质的大小对甲烷分子成泡规律的影响.研究表明:甲烷分子在水中成泡包括甲烷分子在水中的溶解、局部聚集成核、成泡与气泡的破裂和气泡的生长与稳定4个过程.上覆压力越小,开发的压力降越大越有利于甲烷分子脱附后形成稳定的气泡;在煤层气开发初期,甲烷以扩散方式运移,低温和低矿化度有利于气泡的生成.The chemical theories are used to describe process of coalbed methane（CBM） molecules’ dissolution and bubbles formation.Moreover,forces and works of bubbles formation are analyzed,combined with real situation of the field production practice,bubbles formation influence of temperature,overlying pressure,reservoir water salinity,pressure drop and pore medium size are discussed.It shows that methane molecules’ bubbles formation in the water includes methane molecules four process of bubbles dissolved in water,local gathered nucleation,bubbles formation and bubble burst,the air bubble growth and stability.The smaller overlying pressure is,the larger pressure drop is,the easier methane molecules form stable bubbles,during early period of CBM development,low temperature and low salinity are benefical to bubble formation when methane molecules move with the diffusion way.

关 键 词：煤层气 气泡 聚并 微观过程 

分 类 号：TE37[石油与天然气工程—油气田开发工程]