allocation factor for oil well and water injector

N80 # oil pipe steel

Motors specialinged for oil well rigs

mechanical oil well

measuring oil from a well

Measuring instrument for the oil well temperature

Manifold GP-control (pilot oil supply) (steel body)

main oil pipe

lubricating oil filling pipe

low permeability oil well

long time shut-in oil well

light oil well

large oil storage tank steel

Jiao 7 oil well

J55 oil well casing tube

J55 oil well

J55 oil casing steel

J55 class oil pipe

inner wall of oil well pump