Well fluid isolation and sample apparatus and method

Details Well fluid isolation and sample apparatus and method Well fluid isolation and sample apparatus and method

1994-07-07

1995-09-19

Buiz, Michael Powell

Wells

Processes

Sampling well fluid

166369, E21B 4300

Patent

active

054509009

ABSTRACT:
The present invention specifically permits purging and/or sampling of a well but only removing, at most, about 25% of the fluid volume compared to conventional methods and, at a minimum, removing none of the fluid volume from the well.
The invention is an isolation assembly that is inserted into the well. The isolation assembly is designed so that only a volume of fluid between the outside diameter of the isolation assembly and the inside diameter of the well over a fluid column height from the bottom of the well to the top of the active portion (lower annulus) is removed. A seal may be positioned above the active portion thereby sealing the well and preventing any mixing or contamination of inlet fluid with fluid above the packer. Purged well fluid is stored in a riser above the packer. Ports in the wall of the isolation assembly permit purging and sampling of the lower annulus along the height of the active portion.

REFERENCES:
patent: 3703926 (1972-11-01), Roeder
patent: 4766955 (1988-08-01), Petermann
patent: 4776401 (1988-10-01), Dollison
patent: 4903765 (1990-02-01), Zunkel
patent: 4940088 (1990-07-01), Goldschild
patent: 5189909 (1993-03-01), Oike et al.
patent: 5293934 (1994-03-01), Burge et al.
patent: 5372200 (1994-12-01), Merrill, Jr.

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