Hydraulic work over (Snubbing) services are increasingly
favored, having the advantage of eliminating the need to kill
the well. It lowers the cost as well as the time and problems
associated with circulating salt water, mud and other fluids.
The Cavins “Advance” Model “C,” “C-HD,” and “F” Spiders
have specifically been designed for snubbing operations. It
can work in its right side up position (Fig. 2) or in the inverted
upside down position (Fig. 1). The Spider Body and Slips are
specially designed for this service. The gripping Inserts however,
are of standard design and are interchangeable with the
regular Cavins Spiders. Tubular Goods from 1.315" (1" O.D. to
5-1/2" O.D. can be handled with a clear opening for 6.050"
O.D. casing coupling with the Model “C” and “C-HD” Spiders.
Tubular goods 2-3/8" O.D. to 8-5/8" O.D. can be run with the
Model “F” Spider. All Spider models can be either hydraulic or
compressed air operated. A minimum of moving parts
assures a trouble-free operation.
FIGUR-3
A typical set of spiders on a snubbing rig is illustrated in
Fig. 3. Four spiders may be used: two (2) in the regular
(upright) position and two (2) in the inverted (snubbing) position.
One regular and one inverted spider are stationary and
the other regular and inverted spiders are mounted on the
traveling piston. The traveling spiders are used to either push
the pipe into the well or pull it from the well while the stationary
spiders are used to hold the string of pipe when the traveling
spiders are not engaged.
-- PART'S READY STOCK --
FIGUR-4
Fig. 4
Cavins Model “C-HD” Spiders will handle tubular goods in a size range
of 1" to 5-1/2" O.D. with a maximum load capacity of 250,000 pounds
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Figur-1 & Figur-2
FIGUR-3
FIGUR-4
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