Well packers

Patent · Tue Apr 15 04:00:00 EST 1986

OSTI ID:5516868

Akkerman, N H

A packer adapted to be installed within a well bore is described which consists of a pair of tubular members arranged one within the other for relative axial movement between retracted and extended positions, an annular packing element of deformable sealing material disposed between axially spaced-apart, oppositely facing shoulders about the members for radial expansion into sealing engagement between the pipe string and packer as the members are moved to retracted position, and means for releasably latching the packing element in expanded position. A lock ring is included having cam teeth on its outer side engaged with cam teeth on the inner circumference of the outer member for circumferential expansion and contraction with respect thereto, a latching member carried by the inner tubular member and having ratchet teeth on its outer surface slidably engageable with ratchet teeth on the inner side of the lock ring, the longitudinal extent of the ratchet teeth on the inner side of the lock ring being of greater length than the longitudinal extent of the ratchet teeth on the outer surface of the latching member to permit relative axial movement of the tubular members to retracted position as the lock ring expands and contracts with respect to the other tubular member. The latching member includes a portion which is circumferentially expandable and contractible with respect to the remainder thereof, and a sleeve shiftable within the latching member from one position for blocking contraction of the portion thereof, during retraction of the tubular members, and to another position freeing the portion of the latching member for contraction in order to release the tubular members for return to extended position.

• Assignee: AVA International Corp., Houston, TX
• Patent Number(s): US 4582135
• OSTI ID: 5516868
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020300* -- Petroleum-- Drilling & Production
03 NATURAL GAS
030300 -- Natural Gas-- Drilling
Production
& Processing
CONTRACTION
DRILL PIPES
DRILLING EQUIPMENT
EQUIPMENT
EXPANSION
FABRICATION
FASTENERS
FASTENING
INSTALLATION
JOINING
MATERIALS
NATURAL GAS WELLS
OIL WELLS
PACKINGS
PIPES
POSITIONING
SEALING MATERIALS
WELLS