A sucker rod is a

steel Steel is an alloy made up of iron with added carbon to improve its strength and fracture resistance compared to other forms of iron. Many other elements may be present or added. Stainless steels that are corrosion- and oxidation-resistant ty ...

rod, typically between 25 and 30 feet (7 to 9 meters) in length, and threaded at both ends, used in the

oil industry The petroleum industry, also known as the oil industry or the oil patch, includes the global processes of exploration, extraction, refining, transportation (often by oil tankers and pipelines), and marketing of petroleum products. The larges ...

to join together the surface and downhole components of a reciprocating piston pump installed in an oil well. The

pumpjack A pumpjack is the overground drive for a reciprocating piston pump in an oil well. It is used to mechanically lift liquid out of the well if there is not enough bottom hole pressure for the liquid to flow all the way to the surface. The arra ...

is the visible above-ground drive for the well pump, and is connected to the downhole pump at the bottom of the well by a series of interconnected sucker rods. Sucker rods are also commonly available made of fiberglass in 37 1/2 foot lengths and diameters of 3/4, 7/8, 1, and 1 1/4 inch. These are terminated in metallic threaded ends, female at one end and male at the other. The surface unit transfers energy for pumping the well from the prime-mover to the sucker rod string. In doing this, it must change the rotary motion of the prime-mover to reciprocating motion for the sucker rod. And it must reduce the speed of the prime-mover to a suitable pumping speed. Speed reduction is accomplished by using a gear reducer, and rotary motion of the crank shaft is converted to oscillatory motion by means of a walking beam. The crank arm is connected to the walking beam by means of a pitman arm. The walking beam is supported by a Samson post and saddle bearing. The horse head and bridle are used to ensure that the pull on the sucker rod string is vertical all times so that no bearing movement is applied to that part of sucker rod string above stuffing box. The polished rod and stuffing box combination is used to maintain a good liquid seal at the surface.

Technical parameters

Mechanical Properties for OCTG Sucker Rod

Mechanical Properties for Sinker Bar

Productive process of sucker rod

*1. Inspection of steel round bar *2. Straightening -Cold *3. Length cutting *4. Forging *5. Heat treatment *6. Straightening - heat *7. Shot blasting *8. Upset Machining *9. Assembly, Protect cap *10. Packing, Varnishing

References

Schlumberger Oilfield Glossary: Sucker rod
Oilfield terminology {{Petroleum-stub

Technical parameters

Mechanical Properties for OCTG Sucker Rod

Mechanical Properties for Sinker Bar

Productive process of sucker rod

See also

References