Circulation after they leave generally require 60 hour break-in period (known as the), which is manufacturing plants according to normal circulation drilling rigs using early technical characteristics required. Run-in period is to ensure normal operation of circulation, reduce the failure rate, extend the life of normal circulation drilling an important link. But now, some users due to lack of circulation using common sense or because the tight, or gains an end as soon as possible, and ignore the special technical requirements for normal circulation drilling in a break-in period. Even some users think that manufacturers warranty period, machine is broken by the manufacturer is responsible for the maintenance and machine in overload for a long time used during the break-in period, lead to early failure of the machine are frequent, affecting not only the normal use of the machine and shorten the service life of the machine, but also because the circulation drill damage, affecting the progress of the project. Therefore, the circulation period of use and maintenance should be paid enough attention.