Derrick-crown positions for repairing Wells are always not provided with safe operating platforms for derrick crowns.
修井作业的井架天车部位，一直没有天车安全操作平台。
Pull the 1 inch Manila rope inside the derrick and feed and reeve through the first crown sheave.
把一寸的棕绳穿过天车上的第一个滑轮，在井架内拉该棕绳。
Pull the 1 inch Manila rope inside the derrick and feed and reeve through the first crown sheave.
把一寸的棕绳穿过天车上的第一个滑轮，在井架内拉该棕绳。
应用推荐