Method for isolating two aquifers in a single borehole

Patent · Tue Oct 22 00:00:00 EDT 1985

OSTI ID:865642

Burklund, Patrick W ^[1]

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1. Livermore, CA

A method for isolating and individually instrumenting separate aquifers within a single borehole. A borehole is first drilled from the ground surface, through an upper aquifer, and into a separating confining bed. A casing, having upper and lower sections separated by a coupling collar, is lowered into the borehole. The borehole is grouted in the vicinity of the lower section of the casing. A borehole is then drilled through the grout plug and into a lower aquifer. After the lower aquifer is instrumented, the borehole is grouted back into the lower portion of the casing. Then the upper section of the casing is unscrewed via the coupling collar and removed from the borehole. Finally, instrumentation is added to the upper aquifer and the borehole is appropriately grouted. The coupling collar is designed to have upper right-hand screw threads and lower left-hand screw thread, whereby the sections of the casing can be readily separated.

• Research Organization: Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
• DOE Contract Number: W-7405-ENG-48
• Assignee: United States of America as represented by United States (Washington, DC)
• Patent Number(s): US 4548266
• Application Number: 06/572,346
• OSTI ID: 865642
• Country of Publication: United States
• Language: English

Related Subjects

method
isolating
aquifers
single
borehole
individually
instrumenting
separate
drilled
ground
surface
upper
aquifer
separating
confining
bed
casing
sections
separated
coupling
collar
lowered
grouted
vicinity
section
grout
plug
instrumented
portion
unscrewed
via
removed
finally
instrumentation
added
appropriately
designed
right-hand
screw
threads
left-hand
thread
whereby
readily
readily separated
ground surface
upper section
sections separated
single borehole
screw thread
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