Buoyancy assisted running of perforated tubulars

Details Buoyancy assisted running of perforated tubulars Buoyancy assisted running of perforated tubulars

1994-01-28

1995-10-10

Dang, Hoang C.

Wells

Processes

Preventing flow into strainer while lowering by blocking...

166 50, 166376, 166380, E21B 4300

Patent

active

054563178

ABSTRACT:
The perforations of a pre-perforated tubular are plugged with interior protruding, mostly hollow plugs which temporarily seal the perforations. The plugs are capable of withstanding a significant pressure differential and, when combined with an insert, forming a flotation cavity containing a buoyant fluid. The temporarily sealed tubular is then run into a wellbore, the tubular is set, and the plugs are unsealed. The unsealing is preferably accomplished by drilling out the interior protruding portions. Solid baffles may also be placed in the string to limit buoyant fluid loss in the event of premature unsealing in another embodiment of the invention.

REFERENCES:
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patent: 4664191 (1987-05-01), Jennings, Jr.
patent: 5205365 (1993-04-01), Quintana
patent: 5219028 (1992-02-01), Martin et al.

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