Longstroke pumping apparatus for oil wells

Details Longstroke pumping apparatus for oil wells Longstroke pumping apparatus for oil wells

F - Mech Eng,Light,Heat,Weapons

04

B

103/142

F04B 47/02 (2006.01)

Patent

CA 1068551

LONGSTROKE PUMPING APPARATUS FOR OIL WELLS Abstract of the Invention A longstroke pumping apparatus for oil well pumping is provided with turnaround capability and more efficient operation by the use of a two section grooved capstan arrangement from which a flexible pumping cable extends down the well and a flexible counterweight cable extends to a counterweight in a counterweight well. The first section of the capstan from which the pumping cable extends has a basically constant diameter while the second section of the rotatable capstan from which the counter- weight cable extends is formed from three contiguous interconnected portions. The central portion has a sub- stantially constant diameter and the two end portions have respectively an effectively increasing diameter and an effectively decreasing diameter. Variations of the above basic arrangement are also described. -1-

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