A statistical evaluation of formation disturbance produced by well- casing installation methods
Ground Water
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Abstract
Water-resources investigations concerned with contaminant transport through aquifers comprised of very loose, unconsolidated sediments have shown that small-scale variations in aquifer characteristics can significantly affect solute transport and dispersion. Commonly, measurement accuracy and resolution have been limited by a borehole environment consisting of an annulus of disturbed sediments produced by the casing-installation method. In an attempt to quantify this disturbance and recognize its impact on the characterization of unconsolidated deposits, three installation methods were examined and compared in a sand-and-gravel outwash at a test site on Cape Cod, Massachusetts. These installation methods were: 1) casing installed in a mud-rotary hole; 2) casing installed in an augered hole; and 3) flush-joint steel casing hammer-driven from land surface. Fifteen wells were logged with epithermal neutron and natural gamma tools. Concludes that augering is the most disruptive of the three casing-installation methods and that driving casing directly, though typically a more time-consuming operation, transmits the least amount of disturbance into the surrounding formation. -from Authors
Study Area
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | A statistical evaluation of formation disturbance produced by well- casing installation methods |
| Series title | Ground Water |
| DOI | 10.1111/j.1745-6584.1988.tb00385.x |
| Volume | 26 |
| Issue | 2 |
| Year Published | 1988 |
| Language | English |
| Publisher | Wiley |
| Contributing office(s) | Toxic Substances Hydrology Program |
| Description | 11 p. |
| First page | 207 |
| Last page | 217 |
| Country | United States |
| State | Massachusetts |
| Other Geospatial | Cape Cod |
| Google Analytic Metrics | Metrics page |