页岩支撑裂缝中渗透率变化规律实验研究  

Experimental Study on Permeability Evolution in Propped Shale Fracture

作　　者：侯磊[1] Derek Elsworth 孙宝江[1] 王金堂 

机构地区：[1]中国石油大学(华东)石油工程学院,山东青岛266580 [2]EMS Energy Institute and G3 Center,Pennsylvania State University,University Park,usa16802

出　　处：《西南石油大学学报（自然科学版）》2015年第3期31-37,共7页Journal of Southwest Petroleum University(Science & Technology Edition)

基　　金：国家自然科学基金委员会(中国石油化工股份有限公司)(U1262202);中央高校基本科研业务费专项资金(15CX06020A)

摘　　要：在页岩气藏的压裂开发中,支撑裂缝的渗透率是影响裂缝导流能力和压裂增产效果的重要因素。通过实验手段,研究了吸附气体的溶胀作用和支撑剂的嵌入作用对Greenriver页岩支撑裂缝渗透率的影响。采用Pulse test实验方法,测量并对比了非吸附气体和吸附气体的渗透率。以He为代表性的非吸附性气体,实验测得其在花岗岩和页岩中的渗透率曲线为线性,渗透率随着有效应力的减小而增加,且支撑剂的嵌入作用使页岩中的渗透率明显降低;以CO_2为代表性的吸附性气体,实验测得其在页岩中的渗透率曲线呈典型的"U"型,这是由于CO_2溶胀作用和有效应力共同作用的结果,从而说明在页岩支撑裂缝中,溶胀作用同样对渗透率有显著影响;与He在页岩中的渗透率相比,相同压力下的CO_2渗透率更低,且在Langmuir压力值附近达到最小值。In the process of shale gas fracturing exploitation,the permeability of propped shale fracture is one of the key factors that affect the fracture conductivity. This work focuses on the effects of swelling and embedment on permeability in propped shale using experimental method. The Pulse test method was used to measure the permeability of adsorbed gas and non-adsorbed gas. The permeability of He,which is a non-adsorbing gas,in both granite and shale was measured for references. The reduction of permeability in shale is caused by the existence of proppant embedment. The“U shape”feature is observed in CO2 permeability curve,which indicates that the swelling also has a significant effect on the permeability in shale. Compared with the permeability curve of He,the CO2 permeability is even lower and achieves the minimum value at the pressure condition around the Langmuir pressure.

关 键 词：支撑剂嵌入 吸附气体溶胀 页岩支撑裂缝 渗透率变化 

分 类 号：TD315[矿业工程—矿井建设]