Wells – Processes – With indicating – testing – measuring or locating
Patent
1984-01-20
1985-10-22
Suchfield, George A.
Wells
Processes
With indicating, testing, measuring or locating
166 66, 166242, 166264, 166285, 166377, E21B 3313, E21B 4706, E21B 4908
Patent
active
045482667
ABSTRACT:
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.
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Burklund et al., "Method to Avoid Groundwater Mixing between Two Aquifers During Drilling and Well Completion Procedures", UCRL-89440, Jun. 1983.
Carnahan L. E.
Gaither Roger S.
Hightower Judson R.
Suchfield George A.
The United States of America as represented by the United States
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