With the purpose of effectively guaranteeing normal operation of solids control equipment and systems of drilling crews, enhancing the production efficiency and saving the cost of well drilling, KOSUN will regularly arrange maintenance engineers to provide after-sales services at drilling sites, carefully inquire about all situations during the use of equipment, record various HSE problems related to equipment in the construction process of drilling crews, put forward solutions and urge the Construction Party to make improvements. Through improving these details of after-sales services, KOSUN will unceasingly provide customers with better services.