煤岩储层渗透率动态变化模型  

Models of Dynamic Permeability Variation of Coal Seam

作　　者：艾池[1] 栗爽[1] 李净然[2] 白琳[2] 

机构地区：[1]提高油气采收率教育部重点实验室东北石油大学,黑龙江大庆163318 [2]中油大庆油田有限责任公司,黑龙江大庆163511

出　　处：《特种油气藏》2013年第1期71-73,154,共3页Special Oil & Gas Reservoirs

基　　金：黑龙江省海外学者合作基金项目“煤层水力压裂孔隙成核与割理演化研究”(LC2009C33)

摘　　要：煤层气开采过程中,煤岩储层渗透率随压力降低不断变化。在考虑有效应力、基质收缩以及滑脱效应对渗透率影响的基础上,建立煤储层渗透率动态变化模型。研究结果表明:开采初期,储层压力降低,有效应力增大,渗透率降低;煤层气解吸,煤岩基质收缩,渗透率回弹;开采后期,有效应力与基质收缩的影响逐渐减弱,滑脱效应占主导地位,渗透率明显增加。The permeability of coal seam constantly changes with the decrease in pressure in production.The dynamic permeability model of coal seam is established based on the consideration of the impacts of effective stress,matrix shrinkage and slippage effect on the permeability.In the initial period of the production,the coal seam pressure decreases and the effective stress increases,which leads to the decrease in permeability and therefore coal seam gas desorbs,coal seam matrix shrink and permeability rebounds;in the later stage of the production,the effects of the effective stress and matrix shrinkage tapers off and the slippage effect occupies the leading position,and therefore the permeability increases obviously.

关 键 词：煤储层 渗透率 有效应力 基质收缩 滑脱效应 

分 类 号：TE312[石油与天然气工程—油气田开发工程]