腰英台气田天然气水合物防治

Prevention and cure of gas hydrate in Yaoyingtai Gasfield

段宝林 钱卫明

Duan Baolin Qian Weimin

中国石油化工股份有限公司华东分公司采油厂, 江苏泰州 225300

Oil Production Plant of SINOPEC East China Company, Taizhou 225300

松辽盆地南部长岭断陷腰英台深层构造腰深1井井筒及输气管线发生水合物堵塞现象,分析认为天然气水合物是导致堵塞的原因。天然气水合物是在一定温度和压力条件下由天然气中烃分子与游离水结合而形成。计算出腰深1井水合物添加甲醇的合理量,通过从油管和套管添加甲醇,使该井恢复了正常生产,日产气量(6~12)×104m3。防堵的关键是注入甲醇和连续平稳生产。

In view of hydrate plugging in bore hole and gas pipeline of Yaoshen 1 well in Yaoyingtai deep structure of Changling fault depression in the south of Songliao Basin,it is analyzed that gas hydrate caused plugging.Gas hydrate is a combination of hydrocarbon molecule in natural gas and free water under a certain temperature and pressure.The proper volume of methanol to be added into hydrate of Yaoshen 1 well is calculated,and the well puts back on normal production by adding methanol through oil tube and casing with daily gas production rate of（6~12）×104m3.At last,the paper points out that the key to prevent plugging is to inject methanol and continuously stable production.