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...

(most commonly drilling mud). Mud logging is usually performed by a third-party mud logging company. This provides well owners and producers with information...

are compared side-by-side with stratigraphic logs. The gamma ray log, like other types of well logging, is done by lowering an instrument down the drill...

Sonic logging is a well logging tool that provides a formation’s interval transit time, designated as Δ t {\displaystyle {\Delta }t} , which is a measure...

Resistivity logging is a method of well logging that works by characterizing the rock or sediment in a borehole by measuring its electrical resistivity...

one of three well logging tools that are commonly used to calculate porosity, the other two being sonic logging and neutron porosity logging The tool was...

and Well Log Analysts (SPWLA) is an organisation whose mission is to increase the awareness of petrophysics, formation evaluation, and well logging best...

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)...

high to low ionic concentrations. In the case of SP logging, the two aqueous solutions are the well bore fluid (drilling mud) and the formation water (connate...

260 °C (500 °F). Its ambitious measuring program used high-temperature logging tools that were upgraded specifically for KTB. In 2023, China embarked...

and plug setting as well as production logging and reservoir production characterization such as production logging, noise logging, pulsed neutron, production...

in the area of geophysics and well logging were the beginnings of Schlumberger Well Services and the entire well logging industry. Conrad and Marcel were...

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...

A caliper log is a well logging tool that provides a continuous measurement of the size and shape of a borehole along its depth and is commonly used in...

transient/time-domain electromagnetics, and SNMR. Borehole geophysics, also called well logging. Remote sensing techniques, including hyperspectral imaging and airborne...

use of reflection seismology and data from well logging. Academic geologists study subterranean basins as well as those basins which have been exhumed and...

1955 and based in Fort Worth, Texas, United States. It provided well logging and well perforating services to both domestic and international customers...

electric-line used for well logging and perforating. Coiled tubing is used when it is desired to pump chemicals directly to the bottom of the well, such as in a...

Interpretation of Well Logs (Second ed.). Whittles Publishing Services. p. 288. ISBN 0-9541906-0-2. Ellis, Darwin V. (1987). Well Logging for Earth Scientists...

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...

Keystroke logging, often referred to as keylogging or keyboard capturing, is the action of recording (logging) the keys struck on a keyboard, typically...

A logging camp (or lumber camp) is a transitory work site used in the logging industry. Before the second half of the 20th century, these camps were the...

Log ASCII standard (LAS) is a standard file format common in the oil-and-gas and water well industries to store well log information. Well logging is used...

Nuclear magnetic resonance (NMR) logging is a type of well logging that uses the NMR response of a formation to directly determine its porosity and permeability...

geology, formation evaluation (well logging), drilling, economics, reservoir simulation, reservoir engineering, well engineering, artificial lift systems...

porosity Gas porosity John T. Dewan, "Open-Hole Nuclear Logging - State of the Art" - SPWLA Twenty-Seventh Annual Logging Symposium, June 9–13, 1986....

opus Stratum. Borehole image logs Optical borehole imager used for geological mapping and breakouts localization Well logging "Electric Erygmascope. Scientific...

Well Service Trinidad Drilling Valaris Wasco Energy Weatherford International Weir Group Welltec Wood Group Worley}} DeepOcean International Logging Kongsberg...

sub-terrain. Products of wireline logging are wireline logs or well logs.: (Fig. 1. Ll1LOG) In the oil industry the logs are “a recording against depth of...

for well logging. In many cases the "depth of investigation" of a well logging tool is only a few inches (or even less for methods such as sonic logs),...