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  2. Casing (borehole) - Wikipedia

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

    The purpose of surface casing is to isolate freshwater zones so that they are not contaminated during drilling and completion. Surface casing is the most strictly regulated due to these environmental concerns, which can include regulation of casing depth and cement quality. A typical size of surface casing is 13 + 3 ⁄ 8 inches (340 mm). [5]

  3. Multilevel groundwater monitoring systems - Wikipedia

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

    Multi-screen casing completion: the MLS is installed inside of a multi-screened steel or PVC well. Each well screen segment has a sand or gravel pack between it and the borehole wall, and is thus isolated from monitoring zones above and below by a grout or bentonite seal. The MLS is then constructed inside of the multi-screened well.

  4. Well control - Wikipedia

    en.wikipedia.org/wiki/Well_control

    The measured depth is the length of the well including any angled or horizontal sections. Consider two wells, X and Y. Well X has a measured depth of 9,800 ft and a true vertical depth of 9,800 ft while well Y has measured depth of 10,380 ft while its true vertical depth is 9,800 ft.

  5. Completion (oil and gas wells) - Wikipedia

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

    The tubing may also have flow control mechanism. Single-well concentric kill string: within the well a small diameter concentric kill string is used to circulate kill fluids when needed. Single-well 2-tubing completion: in this instance 2 tubing strings are inserted down 1 well. They are connected at the lower end by a circulating head.

  6. Depth in a well - Wikipedia

    en.wikipedia.org/wiki/Depth_in_a_well

    Well depth values from the wireline loggers operation are referred to as "logger's depth". The loggers depth are typically considered more reliable than the drillers depth. The differences between loggers and drillers depths are due to different stretch in the drilling string when drilling, and the wire line entered into the bore hole during ...

  7. Production packer - Wikipedia

    en.wikipedia.org/wiki/Production_packer

    In general, well completions may not incorporate a packer when the annular space is used as a production conduit. A production packer is designed to grip and seal against the casing ID. Gripping is accomplished with metal wedges called "slips." These components have sharpened, carburized teeth that dig into the metal of the casing. Sealing is ...

  8. Wellhead - Wikipedia

    en.wikipedia.org/wiki/Wellhead

    When the well has been drilled, it is completed to provide an interface with the reservoir rock and a tubular conduit for the well fluids. The surface pressure control is provided by a Christmas tree, which is installed on top of the wellhead, with isolation valves and choke equipment to control the flow of well fluids during production.

  9. Tripping (pipe) - Wikipedia

    en.wikipedia.org/wiki/Tripping_(pipe)

    The drill string will be removed from the wellbore to allow a logging crew to conduct a survey of the well. After the logging is completed at total depth, the crew will run the drill string back into the well and then proceed to lay it down when coming out of the hole prior to installing the final set of casing (the "production casing").

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