Wells – Processes – Sampling well fluid
Patent
1993-08-26
1995-10-24
Dang, Hoang C.
Wells
Processes
Sampling well fluid
166106, 166169, E21B 4908
Patent
active
054602246
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 with a packer, pump and exhaust, 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. The packer is positioned above the active portion thereby sealing the well and preventing any mixing or contamination of inlet fluid with fluid 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.
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patent: 3104713 (1963-09-01), Lebourg
patent: 4538683 (1985-09-01), Chulick
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patent: 4635717 (1987-01-01), Jageler
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patent: 4745801 (1988-05-01), Luzier
patent: 5293931 (1994-03-01), Nichols et al.
patent: 5293934 (1994-03-01), Burge et al.
Gustafson Gregg S.
Hall Stephen H.
Schalla Ronald
Smart John E.
Smith Ronald M.
Battelle (Memorial Institute)
Dang Hoang C.
Zimmerman Paul W.
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