油气管道中水合物降压分解实验  

Experimental study of pipeline hydrate depressurization dissociation using a high-pressure flow loop

作　　者：宋光春[1] 李玉星[1] 王武昌[1] 姜凯[1] 施政灼 赵鹏飞[2] SONG Guangchun;LI Yuxing;WANG Wuchang;JIANG Kai;SHI Zhengzhuo;ZHAO Pengfei(Shandong Key Laboratory of Oil-Gas Storage and Transportation Safety,China University of Petroleum,Qingdao 266580,Shandong,China;SINOPEC Star Petroleum Co.,Ltd.,Beijing 100083,China)

机构地区：[1]中国石油大学(华东)山东省油气储运安全省级重点实验室,山东青岛266580 [2]中国石化集团新星石油有限责任公司,北京100083

出　　处：《化工进展》2017年第10期3569-3576,共8页Chemical Industry and Engineering Progress

基　　金：国家自然科学基金(51006120);中央高校基本科研业务费专项资金(14CX2207A;17CX06017;17CX05006);中国石油大学(华东)研究生创新工程项目(YCX2017062)

摘　　要：利用高压环道装置,以柴油、水、天然气为实验介质,在不同含水率(30%、70%、100%)等条件下进行管道内水合物的降压分解实验,研究水合物在油气管道中的降压分解过程。根据实验中水合物形态的演化情况,分析了管道内水合物降压分解的过程和特性,并据此提出了水合物在管道内降压分解的简化物理模型。该模型由4个独立部分组成:水合物在管壁上的分解,主要描述管壁水合物层的变薄、坍塌和脱落过程,气体运移通道和油包气泡结构会在上述过程中出现;水合物在纯水体系中的分解,主要描述管道内的水合物云团因水合物颗粒的不断上浮和分解而逐渐变薄直至消失的过程;水合物在水基体系中的分解,主要描述管道内的水合物云团因水合物絮体的不断上浮和分解而逐渐变薄直至消失的过程,该过程中液相分层现象会因水合物的分解而愈加明显;水合物在油基体系内的分解,主要描述絮状水合物云团因分解而整体收缩直至消失的过程,在该过程中会出现由水合物分解水向下沉降而形成的液相分层现象。To investigate pipeline hydrate depressurization dissociation,a high-pressure flow loop was used where hydrate depressurization dissociation experiments were performed from natural gas+diesel oil+water systems for three different water cuts(30%,70%and100%).Based on the experimental data of hydrate macroscopic morphologies,the processes and characteristics of pipeline hydrate depressurization dissociation were analyzed and a simplified macro physical model including four independent parts was proposed accordingly.For hydrate dissociation on the pipe wall,it mainly includes the processes of hydrate layer thinning,collapsing and falling off.Gas migration pathway and G/O(gas bubble in oil)structures could be observed during these processes.For hydrate dissociation in water systems,the thickness of hydrate cloud would gradually decrease under the combined action of hydrate particle dissociation and floating up.For hydrate dissociation in water-dominated systems,the thickness of hydrate cloud would gradually decrease under the combined action of hydrate floccules dissociation and floating up.In addition,liquid stratification phenomenon would be gradually enhanced during the dissociation in water-dominated systems.For hydrate dissociation in oil-dominated systems,the flocculent-like hydrate cloud would gradually shrink as a whole due to dissociation and a liquid stratification phenomenon caused by dissociated water downward deposition would be observed.

关 键 词：水合物 降压分解 形态 水合物层 水合物云团 物理模型 

分 类 号：TE88[石油与天然气工程—油气储运工程]