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Summary of Dnilmg Methods &Techm for Installing CTMT wells in Unconsohdated Wers Page 1 of <br /> Herne Cauls 13ctNmioaids teals Eq=TC11 A011 <br /> ULU Kkfil� ZtA� '' F Pius 11 1 z 13 14 f <br /> Model A03 CMT Get a Quote, Download Datasheet, GOTO Related Link <br /> Multilevel System — — — �-- — <br /> Summary of Drilling Methods & Techniques for Installing CMT wails in Unconsolidated Aquifer <br /> Drilling Preferred CMT <br /> method Advantages Installation Comments <br /> Technique <br /> Sonic Advancing casing Placa CMT tubing into Depths up to 300 feet <br /> during drilling rasing with anchor Use casing with an <br /> minimizes plate attached to inside diameter(1113) <br /> redistribution of bottom of tubing.Use of at least 4 Inches <br /> contaminants in tubing centralizers to Addition of water to <br /> borehole Steel casing center tubing inside casing may be <br /> prevents borehole of sonic casing Add needed to prevent <br /> from collapsing as alternating lifts of heaving as casing <br /> CMT well is being sand and bentonite removed <br /> built Vibrating casing pelletsi as casing is <br /> w during removal withdrawn,either by <br /> reduces likelihood of gravity placement, <br /> bridging annular tremie methods or <br /> materials using the Soilnst <br /> Sand Bentomte <br /> Injector <br /> Hotlow stem Rigs widely available Place CMT tubing Generally limited to <br /> auger(EISA) Augers provide with anchor plate into depths of <br /> temporary casing that borehole Inside of approximately 100 <br /> can be withdrawn as hollow stem augers feet.Water may need <br /> CMT well is Add aitema#ng lifts of to be added to augers <br /> constructed. bentonde pellets and to counteract heaving <br /> sand pack from sand condi ons Use <br /> surface as augers are augers with at least a <br /> removed.CANT tubing 4-inch Internal <br /> centralizers may he diameter OD) <br /> needed to keep <br /> annular space open <br /> during well <br /> construction <br /> Direct push Rigs are widely Insert CART tubing into Best for shallow <br /> (DP) available DP rasing,then installations where <br /> withdraw casing sand collapses <br /> around CMT tubing <br /> May be difficut to <br /> tremle sand and <br /> bentonite due to <br /> small annular space <br /> between CART tubing <br /> and DP casing <br /> Air rotary Casing prevents Place CHIT tubing into Select casing with at <br /> with casing borehole from casing with anchor least a 4-inch iD <br /> advance collapsing as CMT plate.CHAT tubing Addition of water <br /> well is being built centraftera should be commonly needed to <br /> Consistent-diameter used to center tubing prevent heaving as <br /> hap I/www.solInst.coni/Prod/403/403addon/403SOP Mimi 415ro2 <br />