Environmental Engineering Reference
In-Depth Information
Hardened pump-in washer
−
opens when inner tube is
seated and latched
Hardened retrieving
spear
Shut-off load cell
provides
for indication of core block and
resets automatically
−
Retriever
Reversible inner tube
−
core can be removed from
either end
Hard surfacing
strips
Bit
Grease fitting
Teflon ring
Core lifter
One heavy-duty bearing
designed to take both thrust
and hanging loads
−
Compression spring
−
transfers
core breaking load to the outer
tube
Simple multifinger spring
latch holds inner tube securely
in position
Retriever
Lowered on
wireline cable
−
spreads latch
and grips retrieving spear for
inner tube recovery
−
Teflon ring
Hardened landing seat prevents
inner tube from striking the bit
Locking balls cammed into
positive locking position on
the retrieving spear
Heat-treated retriever
lock body
Swivel connection for
surface handling
Latch spreader
−
opens latch
fingers to release inner tube
assembly
Compression spring force
engages locking bulls on
retrieving spear
Jar rod has provision for
jarring in both directions
FIGURE 2.82
Wireline core barrel and retrieval assembly. (Courtesy of Sprague and Henwood, Inc.)
