Hydraulically operated well packer

Patent · Tue Apr 14 04:00:00 EDT 1992

OSTI ID:5158622

Greenlee, D R

This patent describes a hydraulically operated hollow well packer assembly for insertion in a well casing including a mandrel coupled to a drill string and extending through the hollow well packer in a liquid sealing relationship. It comprises: upper and lower slip assemblies each having pivotable teeth thereon for engaging the well casing when pivoted outwardly to lock the packer assembly in a fixed position ins aid well casing; a least one elastomer seal between the upper and lower slip assemblies; hydraulic means coupled to the upper and lower slip assemblies; a hydraulic piston assembly coupled to the lower slip assembly, upper and lower cone assemblies respectively mounted on the mandrel between the elastomer seal and the pivotable teeth of a corresponding slip assembly; sloping surfaces on the upper and lower pivotable teeth, a cylindrical sleeve coupling the first piston to the lower slip assembly; the first piston being selectively movable from a first position to a second position to carry the lower slip assembly upwardly about the mandrel toward the upper slip assembly to compress the elastomer seals and force the upper and lower slip assembly pivotable teeth into the gripping relationship with the well casing; hydraulic pressure responsive means coupled to the first piston; the hydraulic pressure responsive means having a latch pin engaging both the first piston and the mandrel to lock the first piston in the first position; a second piston associated with the latch pin to hold the latch pin in engagement with the first piston and the mandrel to prevent movement of the first piston; means releasably locking the second piston to the mandrel; and an orifice coupling the interior of the mandrel to the first piston, the latch pin and the second piston for providing hydraulic fluid to the first and second pistons and the latch pin.

• Assignee: Dresser Industries, Inc., Dallas, TX (United States)
• Patent Number(s): US 5103901; A
• Application Number: PPN: US 7-597361
• OSTI ID: 5158622
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020300* -- Petroleum-- Drilling & Production
CONTROL EQUIPMENT
EQUIPMENT
HYDRAULIC CONTROL DEVICES
OIL WELLS
WELL CASINGS
WELL COMPLETION
WELLS