Surface Machinery and Methods for Oil-Well Pumping Page: 92
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92 SURFACE MACHINERY AND METHODS FOR OIL-WELL PUMPING.
wells do not pump more than a few hours a,week, and where powers
handle 15 to 30 wells, each pumped only two or three times a week
and only several hours at a time.
When the power is driven by an electric motor, an ammeter in the
circuit often helps to determine the best arrangement for shackle-
line attachment. When the power is driven by a steam, gas, or oil
engine, an experienced operator will usually detect the presence of
unbalanced load by the action of the engine and the belt.
COUNTERBALANCE AT THE POWER.
If a balanced load at the power is not obtained by direct shackle-
line connection from the wells to be pumped, or if a butterfly in one
dr more of the shackle lines to direct properly the approach necessary
for balanced load is inadvisable, then a counterbalance is used.
The counterbalance is generally of the type shown in Plate XII, A,
at a (p. 62). It is so placed with relation to the power as to give a
balanced load, and it is attached to the power by a shackle line.
The desired amount of counterbalance is obtained by putting enough
material in the weight box or by introducing a multiplier in the
shackle line between the counterbalance and the power. Such ad-
justment is required at many powers when new wells are added to
COUNTERBALANCE AT THE WELL.
Sometimes a counterbalance is used at a well to keep the load
balanced when the well pumps much harder than the others on the
SPEED AND LENGTH OF STROKE.
The speed and length of stroke of the power are important factors
in assuring maximum production from the wells and in, maintain-
ing equipment. The pound or jerk that is so often noticed in shackle
lines, and so often breaks them, is sometimes the result of too fast a
motion, which causes the shackle line to begin its return stroke while
the rods and plunger in the well are still on the down stroke. Some-
times the pound or jerk is due to the plunger of the pump being too
low in the working barrel; then the bottom of the working valve or
plunger hits the top of the stand valve and thus slacks the rods and
shackle line before the up stroke begins. The former difficulty can
be corrected by slowing up the power; the latter, by shortening the
shackle line or by lowering the polish-rod adjuster. Most oil men
seem to agree that the shortest and slowest stroke that will give the
maximum production will also give the best operating conditions for
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George, H. C. Surface Machinery and Methods for Oil-Well Pumping, report, 1925; Washington D.C.. (digital.library.unt.edu/ark:/67531/metadc12407/m1/121/: accessed February 22, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.