我钻井指挥部所属钻井队目前使用的转盘大部分是У7-520-2型转盘。这种转盘在使用过程中的一个显著缺点是泥浆容易漏入转盘内腔,使轴承和齿轮磨损加快,影响转盘的使用寿命。造成这种情况的原因是转盘上盖外圆周往往被泥饼堵塞,致使部分泥浆通过迷宫槽进入转盘内腔。针对这种情况,我厂钻修车间组织工人、干部和技术人员将转盘改装防漏泥浆伞。改装说明如下: Most of the turntables currently used by the drilling crew owned by the Drilling Command are У7-520-2 turntables. A significant disadvantage of this turntable during use is that mud easily leaks into the inner cavity of the turntable, which speeds up the wear of bearings and gears and affects the service life of the turntable. The reason for this is that the outer circumference of the turntable upper cover is often blocked by the mud cake, causing part of the mud to enter the inner cavity of the turntable through the labyrinth groove. In response to this situation, I plant drill shop workers, cadres and technicians will turntable refit slurry umbrella. Modified instructions are as follows: