Patents
The utility model relates to an auxiliary device for welding petroleum pipe fittings
The utility model relates to a telescopic type oil pipe shorting
A cleaning joint
The utility model relates to a corrosion-resistant oil pipe coupling
A movable oil well tubing shorting
The utility model relates to a high-sealing tubing nipple
A threaded joint with high sealing performance
The utility model relates to a drill-free grading cementing device
The utility model relates to a sliding sleeve type horizontal well floating device
The invention relates to a new type of whirling automatic grout floating shoe with floating hoop
A cementing rubber plug
The utility model relates to a copper shear nail installation structure of a graded cementing machin
The utility model relates to a casing centering positioner device for a high-inclination well
The utility model relates to automatic grouting floating hoop floating shoes
