Abstract
This paper describes the results of implementing a Long Stroke Pumping Unit (LSPU) on a re-entry well at Auca field, Ecuador which is operated by the National Oil Company (NOC) Petroamazonas EP.
The optimization of the artificial list system on the selected well, was recommended after careful examination of several parameters such as: mechanical constraints due to well geometry, high depth and high degrees of deviation, low rate of production, low API gravity that in conjunction caused the existing hydraulic jet pump completion to operate at lower efficiency rates.
A few of the benefits of proposing an optimization on the lifting method are:
The use of a LSPU with its 288 in stroke length allows for fewer reversals and thus less cycles in the downhole equipment allowing for a longer run life when compared to other pumping units.
Tubing-sucker rods lateral loads will be evenly distributed with an appropriate guiding program.
Specialty Downhole equipment such as an insert pump anchor, and a two-stage hollow rod pump allows the operator to save in intervention times up to 40% in costs since does not require use of workover, but only a flushby truck unit
In addition energy consumption is reduced without affecting the rate of production of the well, thus with all these considerations reciprocating rod lift with a long stroke pumping unit was selected.
