Multiple sampling lysimeter

Details Multiple sampling lysimeter Multiple sampling lysimeter

1994-09-13

1995-11-14

Raevis, R.

Measuring and testing

Sampler, sample handling, etc.

Capture device

7386474, E21B 4908

Patent

active

054656281

ABSTRACT:
A device for selectively extracting fluid samples from a plurality of zones within an underground formation comprising an elongated tube including a wall having internal and external surfaces, the elongated tube having at least one spaced circumferential filter region disposed within the tube wall. The filter region is provided with a circumferential recess portion having an elongated wall extending within the tube external surface. A filter having internal and external surfaces is positioned within the filter region circumferential recess portion such that the elongated wall of the filter region is spaced from the filter internal surface to form a chamber therebetween. The inner surface of the tube has at least one passage opening to the chamber. The passage has a diameter substantially less than the length of the filter and the chamber. A sliding assembly is provided having a pair of sealing balloons and vacuum extraction apparatus. The assembly is selectively positionable about the filter region to seal the same while applying a vacuum to cause a fluid sample to be extracted through the filter and into the assembly.

REFERENCES:
patent: 2210546 (1940-08-01), Hassler
patent: 2564198 (1951-08-01), Elkins
patent: 3490288 (1970-01-01), Patnode
patent: 4538683 (1985-09-01), Chulick
patent: 4745801 (1988-05-01), Luzier
patent: 4759227 (1988-07-01), Timmons
patent: 4857473 (1989-08-01), Magaritz et al.
patent: 5000051 (1991-03-01), Bredemeier
patent: 5035149 (1991-07-01), Wierenga

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