Method and device for producing unadulterated water samples in d

Details Method and device for producing unadulterated water samples in d Method and device for producing unadulterated water samples in d

1990-05-21

1992-03-24

Neuder, William P.

Boring or penetrating the earth

Processes

Sampling of earth formations

175314, 166264, E21B 2500

Patent

active

050979140

ABSTRACT:
A method and device is used for producing uncontaminated water samples when drilling a well, using a hollow bar for transporting drilling fluid whose conduits consist of nonperforated tubes and at least one perforated tube; the water sample is pumped through filter sand from a water-conducting horizontal, approached by the boring bar, via a perforated insert positioned in the latter after the filter sand is deposited between the perforated tube, the adjacent nonperforated conduit and the bore wall and incorporated into the system as a filter. The bore up to the first water-conducting horizontal is drilled with the closed perforated insert and the first water sample obtained. After closing the perforations, drilling is continued and the filter sand removed until the next water-conducting horizontal is reached, from which a second water sample is taken after reopening the perforations.

REFERENCES:
patent: 3902323 (1975-09-01), Watanabe
patent: 4315542 (1982-02-01), Dockins, Jr.
patent: 4693318 (1987-09-01), Petrovic

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