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2. Casing (borehole) - Wikipedia

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

   Casing is a large diameter pipe that is assembled and inserted into a recently drilled section of a borehole. Similar to the bones of a spine protecting the spinal cord, casing is set inside the drilled borehole to protect and support the wellstream. The lower portion (and sometimes the entirety) is typically held in place with cement. [1]

3. Blowout preventer - Wikipedia

   en.wikipedia.org/wiki/Blowout_preventer

   Patent Drawing of a Subsea BOP Stack (with legend) A blowout preventer (BOP) (pronounced B-O-P) [1] is a specialized valve or similar mechanical device, used to seal, control and monitor oil and gas wells to prevent blowouts, the uncontrolled release of crude oil or natural gas from a well. They are usually installed in stacks of other valves.

4. Conductor pipe - Wikipedia

   en.wikipedia.org/wiki/Conductor_pipe

   A conductor Pipe is a large diameter pipe that is set into the ground to provide the initial stable structural foundation for a borehole or oil well. [1] The Conductor pipe is the first string of casing and is the largest diameter casing to be installed in a well. It can also be referred to as a drive pipe because it is often driven into the ...

5. Cementing equipment - Wikipedia

   en.wikipedia.org/wiki/Cementing_equipment

   A float collar is installed near the bottom of the casing string. Cement plugs land on it during the primary cementing operation, thus retaining inside the casing a small portion of the cement slurry that may have become contaminated as the top plug scrapes the inside of the casing. It is similar to a float shoe; often both are used for redundancy.

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   You can find instant answers on our AOL Mail help page. Should you need additional assistance we have experts available around the clock at 800-730-2563.

7. Multilevel groundwater monitoring systems - Wikipedia

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

   Well clusters consist of a closely spaced group of monitoring wells, each well completed to a different depth in individual boreholes. [1] Well clusters were first used in the 1950s at contaminated sites. [3] Because there is only one well screen in each borehole, there is little risk of vertical connection between zones. [3]