Through the tubing bridge plug

Patent · Tue Jul 02 04:00:00 EDT 1991

OSTI ID:5874483

Coone, M G; Ehlinger, J C

This patent describes through the tubing bridge plug adapted to close off a well bore beneath the lower end of a well tubing. It comprises a body connectable to a pipe string for lowering therewith through the well tubing, an inflatable elastomeric packing element surrounding the body, the body having downwardly and upwardly diverging expanding surfaces respectively above and below the packing element, a first set of relatively thin, elongate metal strips surrounding the body above the upper expander surface, a second set of relatively thin, elongate metal strips surrounding the body below the lower expander surface, means including piston means for moving the first set of strips downwardly to cause their lower ends to slide over the upper expander surface and outwardly against the well bore, and for moving the second set of strips upwardly to cause their upper ends to slide over the lower expander surface and outwardly against the well bore, and means for initially supplying fluid pressure to the piston means for so moving the upper and lower sets of strips and then to the inside of the packing element so as to expand it into engagement with the well bore intermediate the ends of the first and second sets of reinforcing strips, the strips of each set being so arranged that the sides of their ends overlap when expanded, and at least certain of the strips having means on their outer sides for gripping the well bore when engaged therewith.

• Assignee: Davis-Lynch, Inc., Pearland, TX (United States)
• Patent Number(s): A; US 5027894
• Application Number: PPN: US 7-517304
• OSTI ID: 5874483
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020300* -- Petroleum-- Drilling & Production
ELASTOMERS
INFLATABLE SEALS
OIL WELLS
PACKINGS
POLYMERS
SEALS
WELL CASINGS
WELL COMPLETION
WELLS