62 SURFACE MACHINERY AND METHODS FOR OIL-WELL PUMPING.
bearing or hinge. This arrangement is not as good as suspension
from a timber extension of the power arm of the walking beam, be-
cause a given weight of counterbalance will not be as effective and
its location may interfere with the lowering of the walking beam.
Other crude but serviceable types of counterbalance are: A box of
stone or old iron placed on top of the end of the power arm of the
walking beam and old logs or old timbers suspended at one end by
a steel cable or steel-rod attachment to the power-arm end of the
walking beam. The latter type is sometimes used where timber is
plentiful and stone is scarce.
When the counterbalance is hung from a timber extension of the
power arm of the walking beam this extension is generally 8 by 8
inches to 12 by 12 inches in sectional area, depending upon the dis-
tance it extends beyond the end of the walking beam and the weight
required for proper counterbalancing. Some oil companies use
spiked or bolted planks instead of solid timber.
Close adjustment of the type of counterbalance shown in Plate
XI, B (p. 60), can be made by changing the point of support on
the timber extension of the walking beam.
SUMAN PUMPING JACK.
The Suman pumping jack, shown in Plate XIII, A, is described
by John R. Suman, of Houston, Tex., as follows:
This apparatus was designed in an effort to get together a pumping jack
which would do the same work as a standard rig and which at the same time
would be simpler, cheaper to install, and have a lower rate of depreciation. The
standard pumping rig, consisting of bull wheels, band wheel, belt house, mud
sills, etc., is a very cumbersome affair, requiring about 12,000 board feet of
lumber in its construction. In territory such as the Gulf Coast, southern Okla-
homa, northern Louisiana, and southern Arkansas, where rotary tools are used
altogether, this part of the rig is used exclusively for pumping and is not con-
structed until after the well has been completed.
The standard rig has a very high rate of depreciation, especially in the
territory mentioned, where leaky belt-house roofs are quite common with the
attendant slipping belt and lowered production. The construction of the ordi-
nary standard rig requires five or six days' time, causing serious delay
where offset wells are being brought in. The weight of the material which
goes into this rig is no inconsiderable item, and quite often in regions where
the roads are bad considerable trouble and delay are caused before it is all
delivered to the location.
The Suman pumping jack is a very simple and light apparatus which can be
hauled to the location in one load, can be set up in a few hours, and will operate
in any kind of weather without a housing of any sort. It is shown in Plate
XIII, A, as being driven by a steam engine, but it can be driven equally well
with the standard oil-field motor by using a countershaft. The apparatus con-
sists of a revolving shaft on which are mounted a sprocket, a drum, and a crank
arm at either end. The sprocket is keyed to the shaft and the drum idles on the
shaft, being thrown in and out of motion by means of a clutch. The shaft runs
George, H. C. Surface Machinery and Methods for Oil-Well Pumping. Washington D.C.. UNT Digital Library. http://digital.library.unt.edu/ark:/67531/metadc12407/. Accessed October 1, 2014.