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Drilling, Sampling, and Construction of Monitoring Wells Under Flowing Artesian Conditions

1997; Geological Society of America; Volume: III; Issue: 3 Linguagem: Inglês

10.2113/gseegeosci.iii.3.369

1558-9161

Glen Rogers, David R. Moore,

Reservoir Engineering and Simulation Methods

Research Article| January 01, 1997 Drilling, Sampling, and Construction of Monitoring Wells Under Flowing Artesian Conditions GARY D. ROGERS; GARY D. ROGERS Applied Geosciences and Engineering Inc., 405-A Parkway Drive, Greensboro, NC 27401 Search for other works by this author on: GSW Google Scholar DANIEL R. MOORE DANIEL R. MOORE Joyce Engineering, Inc., 436 Spring Garden Street, Greensboro, NC 27401 Search for other works by this author on: GSW Google Scholar Author and Article Information GARY D. ROGERS Applied Geosciences and Engineering Inc., 405-A Parkway Drive, Greensboro, NC 27401 DANIEL R. MOORE Joyce Engineering, Inc., 436 Spring Garden Street, Greensboro, NC 27401 Publisher: Association of Environmental & Engineering Geologists First Online: 09 Mar 2017 Online Issn: 1558-9161 Print Issn: 1078-7275 © 1997 Association of Engineering Geologists Environmental & Engineering Geoscience (1997) III (3): 369–373. https://doi.org/10.2113/gseegeosci.III.3.369 Article history First Online: 09 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation GARY D. ROGERS, DANIEL R. MOORE; Drilling, Sampling, and Construction of Monitoring Wells Under Flowing Artesian Conditions. Environmental & Engineering Geoscience 1997;; III (3): 369–373. doi: https://doi.org/10.2113/gseegeosci.III.3.369 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyEnvironmental & Engineering Geoscience Search Advanced Search Abstract Drilling and sampling in flowing artesian aquifers is significantly more complex than in unconfined aquifers, especially in settings such as dam sites and hazardous waste sites where flow of water from the aquifer can cause safety or contamination problems. Successful drilling in flowing artesian conditions requires four items: properly weighted drilling fluid, inflatable packers, surface casing cemented in place, and driven casing. The primary control used to counteract the upward flow of water and thus prevent flow at the surface is drilling fluid of sufficient density. If the borehole begins to flow during drilling, the other three items are necessary to regain control of the flow. The packer can be used to stop the flow so that drilling fluid can be replaced under no-flow conditions. The surface and driven casings prevent erosion of the borehole walls if artesian flow occurs, and provide secondary locations for installation of a packer.When a boring has been drilled to the desired depth, monitoring well materials may be placed in the hole. These materials consist of a well screen, an inflatable packer, and riser pipe. The well materials are lowered through the drilling fluid into the boring, and a packer attached to the well riser pipe is inflated against the confining bed above the aquifer. Drilling fluid is flushed from above the packer with clean water, which is subsequently displaced with cement grout using a tremie pipe. After the grout has hardened, the drilling fluid can be flushed from inside the well riser and screen. The well can be developed by surging, followed by a period of free flow to remove drilling fluid from the aquifer.These techniques were used to successfully install a number of monitoring wells at a site in a river valley underlain by interbedded clay tills and outwash sand deposits of glacial origin. The deeper sand deposits were confined aquifers, with the clay tills acting as confining beds. Once the clay till was penetrated during drilling, flowing artesian conditions would have occurred unless proper drilling techniques were used. Soil sampling and installation of monitoring well materials would not have been possible under flowing conditions, necessitating the special procedures and equipment for drilling, sampling, and well installation. This content is PDF only. Please click on the PDF icon to access. First Page Preview Close Modal You do not have access to this content, please speak to your institutional administrator if you feel you should have access.