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2. Measurement while drilling - Wikipedia

   en.wikipedia.org/wiki/Measurement_while_drilling

   The terms measurement while drilling (MWD), and logging while drilling (LWD) are not used consistently throughout the industry. Although these terms are related, within the context of this section, the term measurement while drilling refers to directional-drilling measurements, e.g. for decision support for the wellbore path, (Inclination and ...

3. 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 ...

4. Directional drilling - Wikipedia

   en.wikipedia.org/wiki/Directional_drilling

   The thin red circular contour line in the middle of the map indicates the top of the oil reservoir. Because gas floats above oil, the thin red contour line marks the gas/oil contact zone. Directional drilling would be used to target the gas and oil reservoir. Directional drilling (or slant drilling) is the practice of drilling non-vertical bores.

5. Driller's depth - Wikipedia

   en.wikipedia.org/wiki/Driller's_depth

   Driller's depth measurement is tied to drilling operations and other closely associated activities such as logging while drilling), measurement while drilling, and coring. Driller's depth is always recorded, and it constitutes the primary depth system, unless it is later superseded by a more accurate measurement such as the depth from an open ...

6. Resistivity logging - Wikipedia

   en.wikipedia.org/wiki/Resistivity_logging

   Indeed, pure water is very poorly dissociated by its self-ionisation (at 25 °C, pK w = 14, so at pH = 7, [H +] = [OH –] = 10 −7 mol/L) and thus water itself does not significantly contribute to conduct electricity in an aqueous solution. The resistivity of pure water at 25 °C is 18 MΩ·cm, or its conductivity (C = 1/R) is 0.055 μS/cm.

7. 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).

8. Geosteering - Wikipedia

   en.wikipedia.org/wiki/Geosteering

   In the process of drilling a borehole, geosteering is the act of adjusting the borehole position (inclination and azimuth angles) on the fly to reach one or more geological targets. These changes are based on geological information gathered while drilling. Originally only a projected target would be aimed for with crude directional tools.

9. List of abbreviations in oil and gas exploration and production

   en.wikipedia.org/wiki/List_of_abbreviations_in...

   AADE – American Association of Drilling Engineers [1] AAPG – American Association of Petroleum Geologists [2] AAPL – American Association of Professional Landmen; AAODC – American Association of Oilwell Drilling Contractors (obsolete; superseded by IADC) AAV – Annulus access valve; ABAN – Abandonment, (also as AB and ABD and ABND)