Critical velocity reduction in a gas well

Details Critical velocity reduction in a gas well Critical velocity reduction in a gas well

2006-01-10

2008-08-12

Dang, Hoang (Department: 3672)

Wells

Processes

Producing the well

C166S242100, C166S243000

Reexamination Certificate

active

07409998

ABSTRACT:
Disclosed herein is a system for enhancing the recovery of gas in a perforated interval of a gas well. The system features a tubing string having a dead string attached for reducing the flow area of the annulus in the perforated interval, thereby reducing the critical velocity of the gas, i.e., the velocity required to overcome backpressure due to fluids in the well column. The system includes a ported member for receiving gas from the annulus into the tubing string. The ported member and the dead string are isolated from each other by a retrievable plug. The disclosed system provides access from the surface through the dead string for diagnostic or corrective operations. The system also provides delivery of reagents such as foamers to the perforated region to further reduce the critical velocity.

REFERENCES:
patent: 2425202 (1947-08-01), Ozinga
patent: 3901318 (1975-08-01), Fortenberry
patent: 4427070 (1984-01-01), O'Brien
patent: 6491107 (2002-12-01), Dearing et al.
patent: 6585050 (2003-07-01), Etzkorn
patent: 2003/0047316 (2003-03-01), Bosley
Quotation dated Jul. 7, 2005.

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