The company's self-produced products, technology and supporting structures and the export of products; import of raw and auxiliary materials, instruments and equipment, mechanical equipment, spare parts and technology required for production by the enterprise (excluding the operation of a company limited by the country and goods prohibited by the country); feed processing and “three to one repair” business; wholesale and retail of mechanical and electrical products (excluding cars), hardware and electricity (excluding imported cameras); R&D, manufacture, sales and after-sales service of supporting instruments and underground tools for conventional and unconventional oil and gas development and production; R&D and production of instruments for drilling and production manufacturing, sales and after-sales service; Petroleum and natural gas engineering technology services (drilling, completion, logging, oil testing, gas testing, logging, fracturing); R&D, manufacturing, sales and after-sales service for conventional and unconventional oil and gas development and production increase measures and 2 components; solid waste treatment, liquid waste treatment, environmental pollution control design and on-site technical services for oil and gas field solid waste treatment and liquid waste treatment equipment; R&D, manufacturing, sales and after-sales service of oil and gas field solid waste treatment and liquid waste treatment equipment; R&D, manufacturing, sales and after-sales service of special operation vehicles for oil fields. (According to law, projects must be approved, and can only be operated after approval by relevant departments).