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2. Multilevel groundwater monitoring systems - Wikipedia

   en.wikipedia.org/wiki/Multilevel_groundwater...

   Installation of wells clusters can be expensive because of increased drilling costs associated with drilling multiple borings, especially in fractured rock. Nested wells are wells constructed of two or more well screens and casing assemblies of different lengths installed in a single borehole. [1]

3. Oil well - Wikipedia

   en.wikipedia.org/wiki/Oil_well

   The cost to drill a well depends mainly on the daily rate of the drilling rig, the extra services required to drill the well, the duration of the well program (including downtime and weather time), and the remoteness of the location (logistic supply costs).

4. Well - Wikipedia

   en.wikipedia.org/wiki/Well

   A well excavated at the Hemedu excavation site was believed to have been built during the neolithic era. [7] The well was cased by four rows of logs with a square frame attached to them at the top of the well. 60 additional tile wells southwest of Beijing are also believed to have been built around 600 BC for drinking and irrigation. [7] [8]

5. Nested wells - Wikipedia

   en.wikipedia.org/wiki/Nested_wells

   Successful installation of nested wells has been reported by the U.S. Geological Survey [6] in deep (several hundreds to over one thousand feet), large diameter boreholes (≥12 in), with multiple casings (monitoring zones), resulting in seals that are several tens to hundreds of feet thick. This work illustrates that nested wells can be useful ...

6. Casing (borehole) - Wikipedia

   en.wikipedia.org/wiki/Casing_(borehole)

   Optimum design of the casing program decreases the well construction costs, enhances the efficiency of operations and also diminishes the environmental impacts. [3] Casing arranged on a rack at a drilling rig in preparation for installation

7. Completion (oil and gas wells) - Wikipedia

   en.wikipedia.org/wiki/Completion_(oil_and_gas_wells)

   Gas lift well: gas is fed into valves installed in mandrels in the tubing strip. The hydrostatic head is lowered and the fluid is gas lifted to the surface. Single-well alternate completions: in this instance there is a well with two zones. In order to produce from both the zones are isolated with packers.