Retrievable anchor assembly
A retrievable anchor assembly is described for use in well bores and the like, the assembly including: a hollow mandrel having an upper end, a lower end, and having a thread on the exterior thereof between the ends; an annular upper expander member having a threaded interior mating with the thread on the mandrel and having a tapered lower end portion, the mating threads providing for movement of the upper expander member relatively along the mandrel; an annular lower expander member releasably secured to the mandrel between the exterior thread and the lower end of the mandrel in spaced relation to the upper expander and having a tapered upper end portion; an annular slip cage encircling a portion of the mandrel and the upper and lower expander members, the cage having a plurality of circumferentially spaced openings extending therethrough; slip means located in space ones of the openings and resiliently retained on the mandrel by a plurality of resilient annular members extending through the slip means and encircling the mandrel, each slip means including, a convex top surface, a concave lower surface with concave end portions of the lower surface forming surfaces tapering toward the top surface for engaging the tapered end portions of the expander members, end surfaces formed by segments of circles, spaced lug portions projecting outwardly from a pair of side surfaces for engaging the slip cage, an a plurality of holes extending along accurate paths therethrough intersecting the side surfaces.
- Assignee:
- Dresser Industries, Inc., Dallas, TX
- Patent Number(s):
- US 4750559
- OSTI ID:
- 7073045
- Resource Relation:
- Patent File Date: Filed date 28 May 1985
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
03 NATURAL GAS
ANCHORS
NATURAL GAS WELLS
OIL WELLS
DESIGN
FASTENERS
FIELD PRODUCTION EQUIPMENT
MATERIALS HANDLING EQUIPMENT
OPERATION
REMOVAL
SLEEVES
THREADED JOINTS
EQUIPMENT
JOINTS
WELLS
020300* - Petroleum- Drilling & Production
030300 - Natural Gas- Drilling
Production
& Processing