Laserfiche WebLink
Summary of Drilling ;Methods 3c Techniques for Installing CYIT wells in Unconsolidated Aquifers Page 1 of ^_ <br /> i <br /> $ :Intb 4TImidwhowft , 04 Unjis 4 Ma w,% '- <br /> HglnB- Canta¢t'us L3owiutoads- _ Riu!tal - -. : SI[ema <br /> 11 <br /> 1111, 9 CJ a� Previous I 1 I � � 3 ) a <br /> - , Model 403 CMTGeta Quote, Download Datasheet, GOTO Related Link <br /> MultilevelSystem - -„-..-..._—_ __._.......__._m.__........____. _..___�..___.__...___...__.._.__�. <br /> Summary of Drilling Methods & Techniques for Installing CMT wells in Unconsolidated Aquifer <br /> i <br /> s <br /> Drilling Preferred CMT <br /> method Advantages Installation Comments <br /> - Technique <br /> Sonic Advancing casing Place OUT tubing into Depths up to 300 feet, <br />{ J 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 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 pellets1 as casing 7s <br /> during removal withdrawn, either by <br /> reduces likelihood of gravity placement, <br /> bridging annular tremie methods or <br /> materials. using the Solinst. <br /> Sand Bentonite <br /> Injector. <br /> _ Hollow stem Rigs widely available. Place CMT tubing Generally limited to <br /> auger (HSA) Augers provide with anchor plate into depths of <br /> j� 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 _ can be withdrawn as hollow stem augers.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 flinch internal <br /> _ centralizers may be diameter (ID). <br /> needed to keep <br /> annular space open <br /> during well <br /> construction, <br /> Direct push Rigs are widely Insert CMT tubing into Best for shallow <br /> (DP) available. OP casing, then installations where <br /> withdraw casing, sand collapses <br /> around CMT tubing. <br /> j May be difficult to <br /> J tremie sand and <br /> bentonite due to <br /> small annular space <br /> between CMT tubing <br /> I <br /> and DP casing. <br /> 1 Air rotary Casing prevents Place CMT tubing into Select casing with at <br /> with casing borehole from casing with anchor least a 44nch ID, <br /> advance collapsing as GMT plate. CMT tubing Addition of water <br /> well is being built. centralizers should be commonly needed to <br /> lCbnsistentdiameter used to center tubing prevent heaving as <br /> ' _ J http://www.solinst.com/Prod/40j/403addon/403SOP.hbxd 4 4/5/02 <br />