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2. Logging while drilling - Wikipedia

   en.wikipedia.org/wiki/Logging_while_drilling

   Logging while drilling (LWD) is a technique of conveying well logging tools into the well borehole downhole as part of the bottom hole assembly (BHA).. Although the terms Measurement while drilling (MWD) and LWD are related, within the context of this section, the term MWD refers to directional-drilling measurements, e.g., for decision support for the smooth operation of the drilling, while ...

3. Well logging - Wikipedia

   en.wikipedia.org/wiki/Well_logging

   Well logging, also known as borehole logging is the practice of making a detailed record (a well log) of the geologic formations penetrated by a borehole. The log may be based either on visual inspection of samples brought to the surface ( geological logs) or on physical measurements made by instruments lowered into the hole ( geophysical logs).

4. Wireline (cabling) - Wikipedia

   en.wikipedia.org/wiki/Wireline_(cabling)

   Wireline truck rigged up to a drilling rig in Canada. In the oil and gas industry, the term wireline usually refers to the use of multi-conductor, single conductor or slickline cable, or "wireline", as a conveyance for the acquisition of subsurface petrophysical and geophysical data and the delivery of well construction services such as pipe recovery, perforating, plug setting and well ...

5. 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.

6. Caliper log - Wikipedia

   en.wikipedia.org/wiki/Caliper_log

   Nuclear magnetic resonance (NMR) v. t. e. A caliper log is a well logging tool that provides a continuous measurement of the size and shape of a borehole along its depth [1] and is commonly used in hydrocarbon exploration. The measurements that are recorded can be an important indicator of wash-outs, cave ins or shale swelling in the borehole ...

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