Measuring and testing – Borehole or drilling – Downhole test
Patent
1987-05-20
1989-06-13
Yasich, Daniel M.
Measuring and testing
Borehole or drilling
Downhole test
7386333, 166127, E21B 4706, E21B 4900
Patent
active
048380792
ABSTRACT:
A multi-channel pipe for monitoring groundwater in aquifers at multiple levels below a single site. Pipe sections each comprise an outer wall, an interior element dividing the pipe into multiple channels, a monitoring port opening into one of the channels, coupling means for joining pipe sections lengthwise to each other, and a plug for plugging the channel immediately below the monitoring ports. The interior element is preferably star-shaped, having a hollow cylindrical central core and eight radial segments affixed between the core and the outer wall. Each channel is defined in part by the outer wall and in part by two adjacent segments of the interior element. Corresponding channels of adjacent pipe sections are joined by couplings each channel receiving one end of a coupling. A capped plug is inserted into the upper end of the coupling below immediately above the monitoring ports of a channel. An inflatable packer encircling the pipe seals the drill hole between groups of monitoring ports. Each packer is inflated through an inflation port opening into a selected one of the channels of the pipe, designated the inflation channel. Check valve membranes covering the inflation ports prevent backflow from the packers into the inflation channel.
REFERENCES:
patent: 3424246 (1969-01-01), Myers
patent: 3537485 (1970-11-01), March
patent: 4484626 (1984-11-01), Kerfoot et al.
patent: 4538683 (1985-09-01), Chulick
patent: 4669554 (1987-06-01), Cordy
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