准噶尔盆地气井天然气水合物生成实验研究与分析

Experimental study and analysis on hydrate generation for gas wells in Junggar Basin

郭小哲 王福升 赵志辉 胡广文 王金礼

GUO Xiaozhe WANG Fusheng ZHAO Zhihui HU Guangwen WANG Jinli

中国石油大学石油工程学院，北京　102249 中石油西部钻探试油公司，新疆克拉玛依　834000

College of Petroleum Engineering, China University of Petroleum, Beijing 102249, China Well Testing Company, Xibu Drilling and Exploration Engineering Company, Karamay 834000, China

针对准噶尔盆地气井高压易形成水合物冰堵的情况，应用实际矿场的气样进行水合物生成室内实验研究与分析。实验分析结果表明，气样中甲烷含量与氮气含量之和可作为判断天然气生成水合物难易程度的标准；气样中杂质对水合物生成有一定促进作用，实验搅拌速度越快水合物生成时间越短，反映到气井中则是杂质颗粒越多越容易生成水合物，气井产量越大且开关井频繁越容易生成水合物。研究结果可为指导气井水合物预测与预防提供依据。

According to the problem of frequent well head freezing in Junggar Basin gas fields, real field gas samples are taken to conduct experimental study and analysis of hydrate generation. The testing data showed that the sum of methane and nitrogen contents might be the criteria of judging the difficulty degree of hydrate generation. Furthermore, the impurities in gas samples could accelerate the hydrate generation. The faster the stirring speed, the shorter the hydrate generation time. Therefore, the increase amount of impurities in the gas well could accelerate hydrate generation, and the high production with frequent changing of well shut and open status can quicken the wellhead freeze by hydrate generation. At last, the advices are given to prevent hydrate generation in field operations.