页岩气产能影响因素及动态分析  

The influencing factors and dynamic analysis of shale gas deliverability

作　　者：周登洪[1] 孙雷[1] 严文德 陈华 

机构地区：[1]西南石油大学油气藏地质及开发工程国家重点实验室,四川成都610500 [2]中国石油川庆钻探公司,四川成都610051

出　　处：《油气藏评价与开发》2012年第1期64-69,共6页Petroleum Reservoir Evaluation and Development

摘　　要：页岩气藏是具有超低渗透率、无圈闭的特点,且有一部分气吸附于储层岩石表面的特殊气藏。页岩气藏中的天然裂缝在成藏过程中通常由于地层水的作用都被方解石充填,在形成产能之前一般都需要进行压裂。因此页岩气藏产能与常规气藏相比有其特殊复杂的影响因素,表现出其独特的渗流机理和生产动态。分析了页岩气产能的影响因素,阐述页岩气的渗流机理,介绍页岩气产能动态分析方法,并利用实例分析证明随水锁启动压力的增大,气井产能逐渐减小。Shale gas is a kind of special gas reservoir, characterized by ultra-low permeability, no trap mechanism and partial gas adsorbed on the surface of formation rocks. Influenced by formation water, the natural fractures of shale gas reservoir are often packed with calcite during the formation process, and fracturing is necessary to build up productivity. Compared with conventional reservoirs, shale gas reservoirs have peculiar and complicated influencing factors on their deliverability and show unique seepage mechanism and production performance. This paper made detailed analysis of the influencing factors on shale gas deliveribility and illustrated the seepage mechanism of shale gas. Finally, this paper introduced the analysis method of shale gas deliverability performance and proved with practical examples that the productivity of gas wells declined gradually with the increase of water lock threshold pressure.

关 键 词：页岩气 渗流机理 产能动态 启动压力梯度 递减 

分 类 号：TE37[石油与天然气工程—油气田开发工程]