Construction of a Community Borehole Project in Nigeria by Limult
Borehole construction and drilling techniques are reviewed
focusing on the appropriateness of different methods for various aquifer
characterization scenarios. The drilling method and well construction selected
for an aquifer characterization program should be based on consideration of the
type of testing to be performed, borehole conditions required for testing,
formation conditions (borehole stability), formation sample requirements, well
depth, water quality, planned use of the well after the completion of the
program, local driller capabilities and expertise, drilling fluid disposal,
local regulations, and cost.
A key factor dictating
drilling and formation sampling methods is whether or not a borehole is stable
(i.e., penetrated strata are nitrified or sufficiently cohesive). Wells should
be designed, constructed, and developed to maximize well efficiency,
particularly if they are to be used as production wells or for single-well
hydraulic testing (e.g., slug testing).
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