lec 9 slug test

lec 9 slug test - Slug Tests and Others Lecture 9 (Max)...

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Slug Tests and Others Lecture 9 (Max) Qinhong Hu ydrogeology Hydrogeology (GEOL 4320 and 5328) Fall 2009
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Outline Slug tests Confined aquifers Unconfined aquifers Well flow near aquifer boundaries ultiple well systems Multiple well systems Partially penetrating wells Design of hydraulic (aquifer, slug) tests 2 Using software to analyze hydraulic tests
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Slug (Bail–Down) Tests lug: Slug: A solid object : stainless steel or PVC pipe filled ith nd r imil r m t ri l pp d t b th nd with sand or similar material; capped at both ends Water A slug is rapidly introduced into or removed from a small-diameter well, causing a sudden change (increase or decrease) in the water level in the well; the head is measured as a function of time ( response data ) used to determine the hydraulic properties of the aquifer 3 Less expensive than pump tests; effective and quick; suitable for low-permeability materials
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Response Data verdamped water level recover to the Overdamped : water level recover to the initial static level in a smooth manner that p p i t l p t i l is approximately exponential 4
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Response Data nderdamped water level oscillate about Underdamped : water level oscillate about the static-water level with the oscillation ecreasing with time until it ceases decreasing with time until it ceases in wells having a long column in wells screened in a highly transmissive aquifer 5
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Schematics f a Slug of a Slug Test Pressure transducer : semiconductor strain- auge transducer to gauge transducer to measure pressure exerted by overlaying yy g column of water lectric tape to Electric tape : to measure water level in tests of moderate to 6 low k
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Various sizes of PVC slugs used to perturb the water levels in a well to initiate a slug test 7
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No water is handled Pneumatic Slug Test Only the transducer and cable have to be cleaned for another well Test initiation is very rapid Both the pressurization and depressurization are done quickly; a pair of lling ead and rising falling-head and rising head tests can be performed 8 Greene, E.A., and A.M. Shapiro, 1995. Methods of conducting air- pressurized slug tests and computation of type curves for estimating transmissivity and storativity: U.S. Geological Survey Open-File Report 95-424.
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cases of slug test Slug-Test Analysis Method 8 cases of slug test Unconfined aquifer, partially-fully penetrating well, water level variation above the well screen ( rising head test ) Bouwer and Rice method 9 Dagan method KGS model
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8 Cases of Slug Test 10
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Slug-Test Analysis Method For confined aquifers ooper redehoeft and apadopulos Cooper, Bredehoeft, and Papadopulos method Hvorslev method or unconfined aquifers For unconfined aquifers Bouwer and Rice method Dagan method GS odel 11 KGS model
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A volume of water (slug) is suddenly injected j into a nfined confined aquifer 12
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Cooper, Bredehoeft, and Papadopulos (1967) Method ss mptions homogeneo s formation arcian o Assumptions
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lec 9 slug test - Slug Tests and Others Lecture 9 (Max)...

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