Surface Machinery and Methods for Oil-Well Pumping Page: 78
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78 SURFACE MACHINERY AND METHODS FOR OIL-WELL PUMPING.
supports the shackle line; 3, equipment that changes the length of
stroke; 4, equipment that changes the direction of the shackle line
in a vertical plane; 5, equipment that changes the direction of the
shackle line in a horizontal plane; 6, equipment that connects the
shackle line with the power at one end and with the jack at the
Some oil companies make shackle-line structures out of old pipe
and casing when possible; others use bolted timber entirely. In
heavily timbered regions the limbs of suitably situated trees are
used as supports for shackle lines by means of rope or steel-rod pen-
dulums. A large tree or rock may serve as an anchor for a hold-
over. In most of the oil fields, every advantage is taken of natural
features to cut the cost of erecting shackle-iron structures.
EQUIPMENT TO TAKE A WELL OFF OR PUT IT ON THE POWER
TAKE-OFF POSTS AND TAKE-OFF RODS AND RAILS.
Take-off posts generally do double work; they keep the shackle
lines in a horizontal plane when leaving the power and they enable
a well to be taken off the power by the detaching of the shackle line
from its connection to the power. Many are so made that the
side sweep of the rods as they leave the power is confined to that
section of them between the take-off post and the attachment at the
power disk or eccentric.
Plate XX, A, shows a power equipped with take-off posts, a, made
of old casing concreted in the ground and having a timber block
with side pieces bolted on top to keep the shackle lines in a horizon-
tal plane as they leave the power and to limit their side sweep at the
take-off post to the space between the two blocks. The take-off
arrangement for this type of post consists of a take-off rod, b, which
rests in two slots cut into opposite sides of the take-off post, with
the take-off stirrup at the upper and outer end of the rod but below
the take-off hook c on the shackle line. The lower end of the rod is
anchored to the power foundation. At c is shown a well taken off
the power; the stirrup connection to the power is directly above it.
The company using this type of post first digs a hole about 18
inches in diameter and 4 feet deep, in which the post is placed. Con-
crete is then poured around the post to within about 8 inches of the
surface; this depth below surface is necessary to keep frost from lift-
ing or loosening the posts. The wooden posts formerly used by
this company rotted in about two years.
Some take-off posts are set poorly. The writer has seen posts
placed in funnel-shaped holes into which concrete was poured. As
most of the concrete was near the surface of the ground, there was
nothing to hold the bottom of a post firmly in place, and the posts
soon became loose.
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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/m1/107/: accessed April 24, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.