Mechanical downhole equipment in the nature of machines for plugging oil wells and machines for abandonment of oil wells, namely power-operated down hole cementing tools for use in oil, gas, condensate and water wells, well bores and bore holes; apparatus and instruments in the nature of machines for perforation, washing, cleaning, cement plugging, replacing cement plugs, drilling and logging of oil wells; perforating machines for industrial use; apparatus and instruments in the nature of machines for squeezing cement into perforations; apparatus and instruments in the nature of machines for milling-drilling of casing or liner in oil wells; apparatus and instruments in the nature of machines for perforation; apparatus and instruments in the nature of machines for washing and cleaning perforated zones in oil wells; apparatus and instruments in the nature of machines for cement plugging; apparatus and instruments in the nature of machines for replacing cement plugs; apparatus and instruments in the nature of machines for drilling; apparatus and instruments in the nature of machines for logging annular cement; parts and fittings for all aforementioned goods; swab cups specially adapted for use in an apparatus or instrument in the nature of a machine for perforation, washing, cleaning, cement plugging, replacing cement plugs, drilling and logging of oil wells; swab cups specially adapted for use in an apparatus or instrument in the nature of machines for washing and cleaning oil wells; power-operated machines in the nature of perforating guns

Plugging of oil wells and abandonment of oil wells, namely, preparing wells for permanent closure through the placement of cement plugs; drilling of oil and gas-wells; drilling of wells; installation and maintenance of oil installations, namely, of oil well installations; underwater reparation, namely, plugging of underwater oil wells and abandonment of oil wells, namely, cementing services for oil and gas wells; perforating, washing, cleaning, cementing, plugging, mechanically isolating oil wells, and abandonment of oil wells, namely, preparing wells for permanent closure through the placement of cement plugs; rental of mechanical downhole equipment for perforation, washing, cleaning, cementing, plugging and abandonment of oil and gas wells; consultation in relation to the aforementioned services, and non-business supervision of the physical and mechanical performance of the aforementioned services for purposes of ensuring completion