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' Summary of Drilling Methods&Techniq*r Installing CMT wells in Unconsolidated Agmakrs Page l of 2 <br /> ' Products 4 Abauf =4inb da Todeshow Wks Mews; _... ....... <br /> Home -.0r Contactus oowebeds Remak Shen <br /> Previous 111213141 <br /> ' Model 403 CMT Geta Quote Download Detasheet, GOTO Related Link <br /> Multilevel System __..__.._..... . ._._._..._... ____.._. .. . . _._.. ...._......_..__ <br /> ' Summary of Drilling Methods & Techniques for Installing CMT wells in Unconsolidated Aquifer <br /> ' Drilling Preferred CMT <br /> method Advantages Installation Comments <br /> ' Technique <br /> Sonic Advancing casing Place CMT tubing Into Depths up to 300 feet <br /> during drilling casing with anchor Use casing with an <br /> minimizes plate attached to inside diameter(ID) <br /> redistribution of bottom of tubing.Use of at least 4Inches. <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 pelletal as casing is <br /> during removal withdrawn,either by <br /> reduces likelihood of gravity placement, <br /> bridging annular tremie methods or <br /> ' materials. using the Soiinst <br /> Sand Bentonite <br /> Injector. <br /> ' Hollow stem Rigs widely available. Place CMT tubing Generally limited to <br /> auger(NSA) 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 can be withdrawn as hollow stem augers.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 alternating lifts of to be added to augers <br /> ' constructed. bentonite pellets and to counteract heaving <br /> sand pack from sand conditions.Use <br /> surface as augers are augers with at least a <br /> removed.CMT tubing 4-inch internal <br /> centralizers may be diameter(ID). <br /> ' needed to keep <br /> annular space open <br /> during well <br /> construction. <br /> tDirect push Rigs are widely Insert CMT tubing into Best for shallow <br /> (DP) available. DP casing,then installations where <br /> ' withdraw casing. sand collapses <br /> around CMT tubing. <br /> May be difficult to <br /> tremie sand and <br /> bentonite due to <br /> ' - small annular space <br /> between CMT tubing <br /> and DP casing. <br /> ' <br /> Fiths <br /> Casing prevents Place CMT tubing into Select casing with at <br /> borehole from casing with anchor least a 4-inch ID. <br /> collapsing as CMT plate.CMT tubing Addition of water <br /> well is being built. centralizers should becommonly needed to <br /> ' Consistent-diameter used to center tubing prevent heaving as <br /> http://www.solinst.con/Prod/403/403addon/403SOP.httni 4/5/02 <br />