Logging while drilling (LWD) is a technique of conveying well logging tools of the formation data during drilling operations into the well borehole downhole...

surface by the circulating drilling medium (most commonly drilling mud). Mud logging is usually performed by a third-party mud logging company. This provides...

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...

for future well operations. The terms measurement while drilling (MWD), and logging while drilling (LWD) are not used consistently throughout the industry...

or mudlogger or mud engineer. Well logging Mud logging MWD (measurement while drilling) LWD (logging while drilling) Geosteering Expandable tubular technology...

Driller's depth measurement is tied to drilling operations and other closely associated activities such as logging while drilling), measurement while...

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

Directional drilling (or slant drilling) is the practice of drilling non-vertical bores. It can be broken down into four main groups: oilfield directional...

geotechnical engineering, drilling fluid, also known as drilling mud, is used to aid the drilling of boreholes into the earth. Used while drilling oil and natural...

(measurement while drilling), LWD (logging while drilling) or mud motors break down quite often. Another common reason for tripping is to replace damaged drill pipe...

a wireline logging method used in mining, mineral exploration, water-well drilling, for formation evaluation in oil and gas well drilling and for other...

Density logging is a well logging tool that can provide a continuous record of a formation's bulk density along the length of a borehole. In geology,...

with gamma rays or neutron); conveyance (wireline or logging while drilling); and type of drilling mud (water-based mud or oil-based mud). Erygmascope –...

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...

planned trajectory and to also include whatever Logging While Drilling (LWD) / Measurement While Drilling (MWD) tools for formation evaluation. As such...

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

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...

motor and rotary steerable system (RSS), measurement while drilling (MWD), and logging while drilling (LWD) tools. The components are joined using rugged...

taken in the borehole, either during logging-while-drilling or in separate drill-hole logging. Baryte used for drilling petroleum wells can be black, blue...

Measurement while drilling and Logging while drilling. Information acquired thousands of feet below ground, while drilling, is sent through the drilling hole to...

attenuation of the drilling fluid. The decentralization arm typically present on a density logging tool may also be used to create a crude caliper log, which is...

lower mud noise which assists with better measurement while drilling (MWD) and logging while drilling (LWD) decoding. The "normal" mud pump consists of two...

control log DR – dummy-run log DR – drilling report DRI – drift log DRL – drilling DRLCT – drilling chart DRLOG – drilling log DRLPR – drilling proposal/progress...

LWD may refer to: Large woody debris Logging while drilling, on oil wells Lotnicze Warsztaty Doświadczalne, a Polish aerospace manufacturer Leigh Warren...

provide additional power to the bit while drilling. The PCPD pump uses drilling fluid (commonly referred to as drilling mud, or just mud) to create eccentric...

logging (or Wellsite Geology) is a well logging process in which drilling mud and drill bit cuttings from the formation are evaluated during drilling...

While the borehole is being drilled according to the well plan, new geological information is gathered from mud logging, measurement while drilling (MWD)...

deep hole drilling which can often cause the drill to break. A special coolant is usually used to aid in this type of drilling. Gun drilling was originally...

Well drilling is the process of drilling a hole in the ground for the extraction of a natural resource such as ground water, brine, natural gas, or petroleum...

two-way data communication between downhole Measurement while drilling (MWD) and Logging while drilling (LWD) measurement tools and the operators at the surface...