Surface Machinery and Methods for Oil-Well Pumping Page: 124
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124 SURFACE MACHINERY AND METHODS FOR OIL-WELL PUMPING.
gained by the use of gas traps and the general principles involved
in gas-trap construction, as follows:
SUMMARY OF ADVANTAGES GAINED BY USE OF GAS TRAPS.
Traps are used under varying conditions of pressure, from vacuum to a
pressure above atmospheric. The principal advantages obtained by the use
of traps under vacuum, but not under pressure, are as follows:
1. Increased gasoline content of the gas.
2. Elimination of a part of the storage losses.
When the gas is taken under pressure the advantages gained, which are
not obtained when operating under vacuum, are:
1. Decreased tendency of the well to produce sand.
2. Decreased trouble from collapsed casing.
3. Decreased tendency of oil and water to emulsify.
4. Increased gasoline content of oil shipped.
5. Removal of vapors from gas and improvement of gas for transportation
long distances in pipe lines.
With either vacuum or pressure traps, or with traps working at atmospheric
pressure, the operator gains the following benefits:
1. Increased quantity of gas available for use or sale, hence decreased con-
sumption of other fuels.
2. Minimized danger from fires.
3. Decreased loss of the lighter fractions of the oil.
As gas once lost is gone forever, any one of the above advantages should
be enough to cause the universal use of gas traps.
GENERAL PRINCIPLE INVOLVED IN GAS-TRAP CONSTRUCTION.
The basic principle of gas-trap construction is simple. The mixture of oil
and gas is allowed to flow through a chamber large enough to reduce the
velocity of the mixture to the point at which the oil and the gas tend to
separate. The gas, seeking the top of the chamber, is drawn off free of oil;
the oil is drawn off at a lower point and the escape of the gas through the oil
discharge opening is prevented. Traps have been constructed to meet a
variety of conditions, and it is safe to say that the gas can be saved from any
well that is under control; also if a trap is properly installed there should
seldom be interference with the production of oil.
Plate XXXI, B, at d, shows a small building housing a gas trap in
the Big Muddy field, Wyo. Plate XXXII, A, at b and c, shows two
gas traps made from old boiler shells welded and made gas tight
with the acetylene blow-torch. The gas lines leading from gas
traps are shown at d and e and the lines leading to the gas trap and
delivering oil and gas from the wells are shown at f and g. The oil-
discharge pipes to the production tank a are on the rear of the gas
traps and are not shown.
STOREROOMS, SHOPS, AND YARDS.
In the older oil fields near manufacturing centers, or near stores
or shops of oil-well supply companies, the storerooms, shops, and
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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/m1/159/: accessed October 22, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.