钻井用钢丝绳通过天车和游动滑车以滑轮组的形式获得机械上效益。
The drilling line is reeled over the crown block and traveling block to gain mechanical advantage in a "block and tackle" or "pulley" fashion.
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.
把棕绳穿过天车上的第一个滑轮。
Reeve the 1 inch Manila rope through the first crown sheave.
把棕绳穿过天车上的第一个滑轮。
Reeve the 1 inch Manila rope through the first crown sheave.
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