But in case it has to evacuate the area around the damaged well, which lies some 50 miles off the Louisiana coast, BP also placed a special plug inside the well's casing.
但是为了预防，必须从离路易斯安那海岸大约50英里的毁坏的油井附近区域撤离，BP也在油井盒里放置了一个特殊的塞子。
Because the limit of special casing program of sidetracking well and horizontal well, the fishing success ratio of conventional little junk fisher is low.
由于侧钻井、水平井特殊井身结构限制，常规的小件落物打捞器打捞成功率低。
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