Insights - Energy Dais

Here’s What Really Matters in Sucker Rod

A sucker rod is a steel rod with threaded ends that is used in the oil industry to connect the surface and down hole components of a reciprocating piston pump installed in an oil well.  It is usually between 25 and 30 feet (7 to 9 metres) in length.  The pump jack is the well’s pump visible above-ground drive, connected to the down hole pump at the well’s bottom by a set of interconnected sucker rods. Sucker rods are also available in fiberglass and in lengths of 37 1/2 feet with diameters of 3/4, 7/8, 1, and 1 1/4 inches because this will determine how much power it has to push a well.  These have metallic threaded ends on one end and female threaded ends on the other.

Function of a sucker rod:

The surface unit distributes energy from the prime mover to the sucker rod string to pump the well.  It must do so by changing the prime-rotational mover’s motion to a reciprocating motion for the sucker rod.  It must also reduce the prime-speed’s mover to a pumping speed that is appropriate.  A gear reducer is used to reduce the speed, and a walking beam is used to transform the rotating motion of the crankshaft to an oscillatory motion.  By use of a pitman arm, the crank arm is attached to the walking beam.  A Samson post and saddle bearing support the walking beam.  The horse head and bridle are employed to keep the pull on the sucker rod string vertical at all times, preventing any bearing movement on the part of the sucker rod string above the stuffing box.  To keep a good liquid seal at the surface, the polished rod and stuffing box combination are used.

Types of sucker rod and their use:

  • A single-size rod and a tapered rod.  For the former, you should use only two sizes, and for the latter, a taper of four sizes is not recommended.
  • The grade.  This refers to the type of steel used in it.   Grade C and Grade D, and Grade K.  Each grade has its own properties, and each one has its own chemical composition and mechanical properties. 
  • The first type of Sucker Rod is a high-pressure version, while the latter has a low-pressure pump.  The higher-pressure type is more efficient than the lower-pressure type. 
  • The second type is a low-pressure sucker rod.  This is also known as a low-pressure type.  This type is made from medium carbon steel.  These are similar to the ones used for axles or shafting. The rod connector is welded to the rod body through friction welding or heat treatment.  A rolling depression is then used to make the thread.  The compression and rolling machine produce a continuous metal fibre thread.  This increases the strength of the thread, while reducing the concentration of stress.  The centre diameter is controlled to prevent any loose connection.EnergyDais has listed Top Sucker Rod Companies on our listing page www.energydais.comIf you would like to know more about effective solutions for your wells and business, contact our team at contact@energydais.com
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