The packer off liner -- the GWis run in below a wing or baffle coupling.
The coupling serves to center the packer and supports the tubing on the
liner. Tubing may also be spaced in liner with anchor-pipe below the
packer. Circulation from casing to tubing may be established, if desired,
by circulating down the casing past the cup lips and up the tubing. In
this installation, cup lips are pointing down with ample fluid passage
around the packer before entering liner.
To pack off mud or fluid in casing above packer, the GW is run
in above an anchor pipe with a Type S or SJ slide valve above the
packer. Valve is open while running in to allow fluid to bypass packer
on which cups are assembled with lips pointing up. With anchor pipe
resting on bottom and valve closed, the GW will pack off mud or fluid in
casing above the packer. Well may then be swabbed in through the tubing
leaving the casing loaded with fluid.
To pack off casing and produce through casing on pumping well
without tubing leaks, the GW is run in with a standing valve, working
barrel, and perforated mandrel above the packer in the order named and
an anchor pipe below the packer on which the cup lips are pointing up. A
double stuffing box is used at the wellhead. Tubing may be filled
with fresh oil and the well pumped to produce through the casing. Fresh
oil will stay in the tubing and keep the rods lubricated. If tubing
should later leak, well could be produced through either casing or
tubing without disturbing the installation.
To pack off casing in a pumping
well with tubing leaks, the GW is run in with a working barrel, standing
valve, and anchor pipe below the packer in the order named and a
perforated mandrel above the packer on which the cup lips are pointing
up. A double stuffing box is used at the wellhead. Tubing and casing may
then be filled with oil or water and the well pumped to produce though
either casing or tubing. If it is not possible to fill casing from the
surface, the well may still be pumped and tubing and casing filled with
well fluid, after which, the well will produce through either casing or
tubing as desired.
To pack off in both directions, the GW four-cup packer is run
in the well with two cups pointing up and two cups pointing down. Two or
more packers may be run in series to isolate specific zones and for
spotting operations when used in conjunction with perforated mandrels.
The above applications are only a few of many for which this versatile
packer may be used. Other possible uses to fit specific well
requirements will suggest themselves to the production menu, service
man, engineer, or drilling superintendent.