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2. 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.

3. Well drilling - Wikipedia

   en.wikipedia.org/wiki/Well_drilling

   Well drilling is the process of drilling a hole in the ground for the extraction of a natural resource such as ground water, brine, natural gas, or petroleum, for the injection of a fluid from surface to a subsurface reservoir or for subsurface formations evaluation or monitoring.

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. Oil well - Wikipedia

   en.wikipedia.org/wiki/Oil_well

   A well that is designed to produce only gas may be termed a gas well. Wells are created by drilling down into an oil or gas reserve and if necessary equipped with extraction devices such as pumpjacks .

6. Production tubing - Wikipedia

   en.wikipedia.org/wiki/Production_tubing

   The production liner has the same function as a complete string of production casing. A typical casing arrangement in a well is shown in the diagram below. In this case, the surface casing is set to a depth of about 3,000 ft (910 m). Two intermediate strings are set in this well — a 13 + 3 ⁄ 8 in (340 mm) string and a 9 + 7 ⁄ 8 in (250 mm ...

7. 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 ...