涪陵焦石坝地区页岩气吸附规律研究  

RESEARCH ON RULES OF SHALE GAS ADSORPTION AT JIAOSHIBA AREA IN FULING

作　　者：蒲明政 唐善法[1,2] 姚逸风 周天元[1] 薛汶举 

机构地区：[1]长江大学石油工程学院 [2]长江大学非常规油气湖北省协同创新中心

出　　处：《钻采工艺》2017年第4期40-43,共4页Drilling & Production Technology

基　　金：非常规油气湖北省协同创新中心创新基金项目"页岩气吸附解吸附特性及清洁压裂液优选研究"(编号:HBUOG-2014-2);国家自然科学基金项目"阴离子双子表面活性剂-纳米粒子构筑耐高温清洁压裂液基础研究"(编号:51474035)

摘　　要：为研究礁石坝页岩气在产层超临界条件下的吸附规律,利用页岩气等温吸附仪,以礁石坝露头页岩及产层页岩为吸附剂,以甲烷气模拟页岩气作吸附质,测试了不同温度(60℃、70℃、80℃)时,甲烷气吸附量随其压力(2~30 MPa)的变化规律。以过剩吸附量修正亚临界吸附模型(Langmuir、Freundlich、Expand-Langmuir,Langmuir-Freundlich,Toth,B-BET,T-BET,D-R,D-A)为超临界吸附模型,并利用相关系数法优选甲烷气超临界等温吸附最佳模型,阐述了页岩气吸附特征及温度、页岩类型对超临界吸附量的影响。实验结果显示,超临界条件下(温度:60℃~80℃、压力2~30 MPa),产层及露头页岩对甲烷气吸附规律均可用超临界D-A方程进行描述,在实验温度范围60℃~80℃,甲烷气在页岩上的超临界饱和吸附量随温度增高而下降,随页岩中黏土、斜长石含量升高而增大。可知,采用超临界D-A模型描述涪陵礁石坝地区页岩气吸附规律具有较好的准确性。In order to study the rules of shale gas adsorption under supercritical conditions at JSB area,the shale gas isothermal adsorption apparatus was used for testing,the production shale and the shale outcrop at JSB were used as adsorbents,and methane gas was used as absorbing medium to simulate shale gas,the methane adsorption was tested to find how it changed with pressure( 2 ~ 30 MPa) when at different temperatures( 60℃ 、70℃ 、80℃). Taking the excess adsorption modified subcritical adsorption model( Langmuir、Freundlich、Expand-Langmuir,Langmuir-Freundlich,Toth,B-BET,T-BET,D-R,D-A) as the supercritical adsorption model,and the optimization method of correlation coefficient was used to decide the optimal model of supercritical methane gas adsorption,the effects of methane gas adsorption characteristic,temperature,shale type on supercritical adsorption were expounded. The experimental results show that,under supercritical conditions( temperature: 60℃ ~ 80℃ 、pressure 2 ~ 30 MPa),the rules of methane gas adsorption in the production layer and outcrop shale can be described by the supercritical D-A equation,R2 is greater than 0. 99,and the physical meaning of all parameters in the equation is obvious.And within the experimental temperature range( 60 ~ 80℃),the methane adsorption on the shale will decrease with the increase of temperature,and increase when the clay content and plagioclase content increased. It can be concluded that the supercritical D-A model is rather accurate when describing the rules of shale gas adsorption at JSB area.

关 键 词：涪陵礁石坝页岩气 超临界等温吸附规律 过剩吸附量 绝对吸附量 超临界吸附模型 

分 类 号：P618.13[天文地球—矿床学]