Maintenance of existing materials and accessories based on the difficulty? This fully requires the maintenance personnel on-site maintenance emergency measures play. Emergency repairs are usually field divided into three parts, one is through the use of welding and machining method of grinding method of repairing parts, and the other is through the use of intact components or materials having the same performance, for replacement and repair of damaged parts of substituting alternative method, this method can not only save money with emergency repairs, and be able to do the full utilization of idle resources. The third method is the direct cause of the failure will be damaged and discarded parts and components, and then run the circuits or mechanical piping make connections, to ensure drilling work fast recovery operations, this method is basically the implementation of the first two methods difficulty arises, will choose.