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Well logging methods
Caliper
Density
Gamma ray
Mud
Resistivity
Sonic
Spontaneous potential
Logging while drilling (LWD)
Measurement while drilling (MWD)
Nuclear magnetic resonance (NMR)
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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). Some types of geophysical well logs can be done during any phase of a well's history: drilling, completing, producing, or abandoning. Well logging is performed in boreholes drilled for the oil and gas, groundwater, mineral and geothermal exploration, as well as part of environmental and geotechnical studies.
Welllogging, also known as borehole logging is the practice of making a detailed record (a welllog) of the geologic formations penetrated by a borehole...
are compared side-by-side with stratigraphic logs. The gamma ray log, like other types of welllogging, is done by lowering an instrument down the drill...
(most commonly drilling mud). Mud logging is usually performed by a third-party mud logging company. This provides well owners and producers with information...
Logging while drilling (LWD) is a technique of conveying welllogging tools into the well borehole downhole as part of the bottom hole assembly (BHA)...
Keystroke logging, often referred to as keylogging or keyboard capturing, is the action of recording (logging) the keys struck on a keyboard, typically...
and WellLog Analysts (SPWLA) is an organisation whose mission is to increase the awareness of petrophysics, formation evaluation, and welllogging best...
neolithic era. 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...
log PLR – pig launcher/receiver PLS – position location system PLSV – pipelay support vessel PLT – production logging tool PLTQ – production logging tool...
Sonic logging is a welllogging tool that provides a formation’s interval transit time, designated as Δ t {\displaystyle {\Delta }t} , which is a measure...
associated petroleum gas along with the oil. A well that is designed to produce only gas may be termed a gas well. Wells are created by drilling down into an oil...
Resistivity logging is a method of welllogging that works by characterizing the rock or sediment in a borehole by measuring its electrical resistivity...
producing the well. The oil and gas industry uses wireline logging to obtain a continuous record of a formation's rock properties. Wireline logging can be defined...
cement bond log documents the evaluation of the integrity of cement work performed on an oil well. In the process of drilling and completing a well, cement...
electric-line used for welllogging and perforating. Coiled tubing is used when it is desired to pump chemicals directly to the bottom of the well, such as in a...
260 °C (500 °F). Its ambitious measuring program used high-temperature logging tools that were upgraded specifically for KTB. In 2023, China embarked...
in the area of geophysics and welllogging were the beginnings of Schlumberger Well Services and the entire welllogging industry. Conrad and Marcel were...
one of three welllogging tools that are commonly used to calculate porosity, the other two being sonic logging and neutron porosity logging The tool was...
transient/time-domain electromagnetics, and SNMR. Borehole geophysics, also called welllogging. Remote sensing techniques, including hyperspectral imaging. Many other...
acquired logging and perforating specialist company Gearhart Industries and combined it with its subsidiary Welex to form Halliburton Logging Services...
A caliper log is a welllogging tool that provides a continuous measurement of the size and shape of a borehole along its depth and is commonly used in...
Wildcatter Extraction of petroleum Stéphane Sainson, Electromagnetic seabed logging, A new tool for geoscientists. Ed. Springer, 2017 "Assigning exploration...
is comparable; anecdotal evidence points towards 25% of logging being illegal. Illegal logging has detrimental impacts, including deforestation and, consequently...
future well operations. The terms measurement while drilling (MWD), and logging while drilling (LWD) are not used consistently throughout the industry...
International Weir Group Welltec Wood Group Worley DeepOcean International Logging Kongsberg Gruppen Petrolink Rolls-Royce Holdings Teledyne Technologies...
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