QUICKSAND AND WATER WELLS

QUICKSAND, WHICH PROBABLY EXISTS IN EVERY STATE IN THE U.S. IN EITHER SURFACE OR SUBSURFACE DEPOSITS, IS COMMONLY FINE- TO MEDIUM-GRAINED SAND WITH AN EFFECTIVE SIZE RANGING FROM LESS THAN .001 TO .005 IN. IN WATER WELLS, A QUICK, OR HEAVING, CONDITION MAY EXIST /AS MUCH AS 150 FT/ IF A CONFINED PERMEABLE, LOOSE SILT, SAND, OR GRAVEL STRATUM IS CONTINUOUS TO DISTANT HIGHER GROUND, AND IS SUBJECT TO A GREATER HEAD OF WATER EXISTING AT THE HIGHER ELEVATION. SIMILAR MATERIAL MAY HEAVE IN A WATER-TABLE /UNCONFINED/ WELL, DUE TO THE NATURAL TENDENCY OF GRANULAR MATERIALS TO MOVE TOWARD A DRILL HOLE WHEN LATERAL SUPPORT IS REMOVED. HEAVING RESULTS FROM A LOSS OF SHEARING STRENGTH AS PRESSURE IS REDUCED WHEN A DRILL HOLE UPSETS NATURAL EQUILIBRIUM. SUCTION PRODUCED BY SUDDENLY WITHDRAWING BAILER OR TOOLS FURTHER CONTRIBUTES TO DISTURBING NATURAL CONDITIONS. IF SUFFICIENTLY PERMEABLE, QUICKSAND AQUIFERS CAN SUCCESSFULLY BE USED FOR WATER SUPPLIES, PROVIDING PROPER SCREENING DEVICES ARE AVAILABLE. DRILLING AND COMPLETION PROBLEMS WITH CABLE-TOOL WELLS CAN USUALLY BE OVERCOME BY /1/ WATCHING CASING ALIGNMENT. /2/ RUNNING BAILER SLOWLY, /3/ KEEPING A CONTINUAL HIGH HEAD OF WATER INSIDE CASING, /4/ USING A HEAVY STRING OF DRILL TOOLS, /5/ ALLOWING CONTROLLED SAND- HEAVING, /6/ USING SHORT CASING DRIVES, /7/ JETTING WITH HIGH-PRESSURE WATER TO WASH-FREE TOOLS IF SEIZED BY A SUDDEN HEAVE, /8/ AVOIDING THIN-WALLED CASING /9/ DRILLING WITH A MIXTURE OF BENTONITE OR NATIVE CLAY AND WATER SLUDGE, AND /10/ CASING ABOVE THE SURFACE IF THE WELL IS FLOWING. WELL SCREENS CAN BE SET BY BAILING THEM DOWN THROUGH A QUICKSAND PLUG WHICH MAY HAVE FORMED, AND COMPLETING USING THE STANDARD PULL-BACK METHOD.

  • Supplemental Notes:
    • Vol 4, No 2, PP 32-46, 11 FIG, 1 TAB, 32 REF
  • Corporate Authors:

    Ground Water

    ,    
  • Authors:
    • Patchick, P F
  • Publication Date: 0

Subject/Index Terms

Filing Info

  • Accession Number: 00228940
  • Record Type: Publication
  • Source Agency: Geoscience Abstracts
  • Files: TRIS
  • Created Date: Aug 15 2004 2:10AM