Oil drilling technology development and technical services, Oil well logging technology development and technical services, Oil drilling technology development and technical services, Mechanical equipment maintenance and technical services, Underground operation technical services, Special equipment for oil drilling、 Research and development of flow controllers、 Manufacturing and sales; Cathodic protection products、Production of sacrificial anodes、 Sale、 Inspection and maintenance;Hydraulic system and device manufacturing、 repair; Modified cars; Modified special structure vehicles; Production and sales of sound insulation and heat insulation materials; Manufacture of water treatment equipment、 Sales and repair; Processing of mechanical equipment and accessories、 manufacture; R&D、 Processing、 manufacture、 and sales: Safety barrier, Isolator, Power transmitter, electronic components, Instruments and accessories, Environmentally friendly cleaning device for well repair operations, Photovoltaic equipment and components( The above two projects are except for those prohibited or restricted by industrial policies); Auto Repair and Maintenance;Pipeline cleaning;Intelligent building system integration services; Information system integration services; Sales and repair: Solar energy and air source heat pump hot water system, Water source heat pump unit; Sale: Mechanical equipment and accessories, Oil drilling equipment and accessories, Pumping unit accessories, valve, Pumps and accessories, Metal materials, Chemical products( Does not contain dangerous goods or highly toxic substances), Building Materials, Auto Parts, Wires and cables, transformer, rubber products, Electronics, Computers and auxiliary equipment, Plumbing equipment, Firefighting equipment, Hardware products, Knitted textiles,Daily groceries, Clothing, shoes and hats, Handicrafts( Except ivory and its products); Import and export of goods; Research and development of petroleum instruments and meters。