气润湿岩石表面气体吸附作用的量子化学研究  

Quantum Chemistry Study of Gas Adsorption on Gas-wet Rock Surface

作　　者：李颖颖[1] 蒋官澄[1] 张斌[2] 尚佳 王大喜[4] 

机构地区：[1]中国石油大学油气资源与探测国家重点实验室 [2]江汉油田分公司采油工艺研究院 [3]渤海钻探第一固井分公司 [4]中国石油大学重质油国家重点实验室

出　　处：《钻井液与完井液》2014年第3期19-23,96,共5页Drilling Fluid & Completion Fluid

基　　金：国家自然科学杰出青年科学基金项目"多孔介质油气藏气润湿基础理论研究"(50925414)

摘　　要：为解决凝析气藏开采中反凝析液堵塞损害和低渗特低渗储层液相圈闭损害,"气润湿"方法近年来成为研究热点,然而岩石的润湿性改变后,其表面对甲烷吸附能力的变化不容忽视。为此,依据所提出的液湿和气润湿岩石表面原子簇模型,利用量子化学从头计算法(HF-3-21G)对气润湿反转前后固体对CH4、CO2、H2O和N2的吸附能力变化进行了研究。结果表明,气润湿反转处理后,岩石表面对所测试的4种流体的吸附能力均减弱;在气润湿岩石表面,吸附能力由强到弱的顺序为:CO2>H2O>CH4>N2,且CH4、H2O、CO2和N2分子在液湿岩石和气润湿岩石表面均为单分子层物理吸附。In producing condensate gas reservoirs 'gas wet' method has recently been focused in researches to solve formation damages caused by retrograde condensate blocking and caused by liquid phase trapping in low-and ultra-low-permeability reservoirs. The wettability change of rock surface results in a change in methane adsorption on rock surface that cannot be ignored. To solve this problem, a study on the changes of adsorptive power of solid surfaces to methane, carbon dioxide, water and nitrogen is conducted using 'ab initio quantum chemistry method'(HF-3-21G). This study is based on the proposed surface atom cluster model of rocks that are liquid wet and gas wet. The study shows that after gas wettability reversal, adsorptive powers of the four gases decrease, and the molecules of these gases on the liquid wet and gas wet rock surfaces are both in monolayer molecule physical adsorption.

关 键 词：气润湿性 储层岩石 吸附势阱 量子化学 

分 类 号：TE258[石油与天然气工程—油气井工程]