SLOW JACK™ OILWELL PUMPING OPTIMIZATION

 One of the most serious problems causing damage and lost production to marginal wells is over-pumping by a pumping unit that is too large for the production capacity of the now “Stripper Well”. When the oil well was originally drilled and completed, the sucker rod pumping system was designed to produce several hundred barrels of fluid per day. Now that same pump jack with its long stroke length and too many strokes per minute is causing a lot of damage to both the downhole and surface equipment. 

The  “ SLOW JACK™ ” is a simple and economical gear reducer that mounts on the pumping unit between the drive motor and the pumping unit’s own gearbox. The “Slow Jack Gear Reducer” is able to produce the correct strokes-per-minute (SPM) needed to produce the available amount of fluid entering the well-bore. With the “Slow Jack Gear Reducer” installed, the producer can adjust the strokes-per-minute to as few as 0.5 SPM. 

Every two (2) SPM eliminated saves almost 3000 strokes per day or over one million strokes per year. This results in less wear and damage on all of the moving parts of the downhole and surface equipment, plus substantial energy savings. The immediate benefits of installing the “Slow Jack Gear Reducer” will increase profits through increased runtimes of the well between workovers, cost of repairs, and reduction in energy costs. 

FEWER SUCKER ROD FAILURES

 Sucker rod parting (breaking) is dramatically reduced as sucker rod buckling is reduced. As the strokes-per-minute (SPM) are reduced, the down hole sucker rod pump plunger is allowed time to fall instead of being forced downward by the weight of the sucker rods. The traveling valve ball/cage assembly is given more time for the fluid to pass through this congested area, thus the pressure drop across the traveling valve is reduced substantially.

 The physical weight of the sucker rod string is the only mechanical force pushing the downhole pump plunger down through the fluid on the down-stroke of the beam pumping unit. Sucker rod buckling is caused when the plunger resists this downward movement. Downward motion is impeded by the inability of the traveling valve ball/cage assembly to allow the fluid to pass by as quickly as is required by high SPM.

When the sucker rod string experiences this resistance to fall, the total sucker rod string weight is supported by the first few rods above the downhole pump. Additionally, if it is necessary to tag bottom, more compression is added to this bad situation. Marginal oilwells with low production and high SPM of the pump jack will always experience a high degree of sucker rod failure of the bottom rods near the down hole pump. 

Rapid fluid movement past the traveling valve ball/cage assembly at high SPM causes the ball to rattle around wildly in the cage, thus causing a dramatic reduction of the service life of the downhole pump. 

At higher strokes-per-minute of the beam pumping unit, a situation will exist where the sucker rods and downhole pump plunger are still falling when the pumping unit has already started the up-stroke. This results in a tremendous force applied to the sucker rod pins and couplings when they are snapped tight so abruptly. This situation results in the bottom hole stroke length being substantially shorter than the pumping unit’s stroke length, dramatically reducing its efficiency. 

LONGER SUCKER ROD LIFE 

A sucker rod string with a normal operation of 15MM cycles @ 9 SPM has a 3.7 year run time life. With the “Slow Jack Gear Reducer” installed for a reduction to 3 SPM, the life span would increase to at least 9.51 years and probably more due to the reduction or elimination of high cyclic loading of the rod string. As the SPM is reduced, down hole stroke becomes more synchronized with the surface equipment. This will result in less sucker rod failure. 

GAS LOCK 

Lower differential pressure across the standing valve will result in less gas breakout in the downhole pump because all of the gas will break out in the annulus. If gas lock still occurs, Gas Lock problems are eliminated by installing our quality “Gas Lock Breaker” which will assist in opening the traveling valve to allow the gas to enter the production tubing and be easily produced along with the fluids.

ADVANTAGES

 Installation of the Slow Jack Gear Reducer” will result in:

                         FEWER SUCKER ROD FAILURES

                        FEWER TUBING FAILURES

                        LONGER DOWNHOLE PUMP RUNS

                        DRAMATICALLY INCREASED PUMP EFFICIENCY

                        LESS WEAR ON THE POLISHED ROD

                        LESS STUFFING BOX PACKING FAILURE

                        LESS DRIVE MOTOR AND BELT WEAR

                        LOWER HORSE POWER REQUIREMENT

                        LESS ENERGY COSTS

                        LESS LIFTING COSTS         

                        MORE PROFITS !!