SUCKER ROD Russian patent published in 2010 - IPC E21B17/04 

FIELD: engines and pumps.

SUBSTANCE: sucker rod comprises cylindrical rod made from high-strength composite material and collar bushing furnished with coupling part incorporating threaded element and mounting part that has inner chamber that accommodates said rod and is filled with adhesive. Collar bushing mounting part chamber represents a cylinder or alternating cylindrical and conical zones. Rod outer surface in said chamber features shaped profile representing a screw or radial grooves. Note here that profile height increases from collar bushing inlet towards its bottom. High-strength composite material can be represented by fiber glass, or carbon fiber-reinforced plastic, or basalt plastic.

EFFECT: increased strength.

6 cl, 5 dwg