Logging while drilling (original) (raw)
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 LWD refers to measurements concerning the geological formation made while drilling.[1]LWD tools work with its measurement while drilling (MWD) system to transmit partial or complete measurement results to the surface via typically a drilling mud pulser or other improved techniques, while LWD tools are still in the borehole, which is called "real-time data". Complete measurement results can be downloaded
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| dbo:abstract | 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 LWD refers to measurements concerning the geological formation made while drilling.[1]LWD tools work with its measurement while drilling (MWD) system to transmit partial or complete measurement results to the surface via typically a drilling mud pulser or other improved techniques, while LWD tools are still in the borehole, which is called "real-time data". Complete measurement results can be downloaded from LWD tools after they are pulled out of hole, which is called "memory data". LWD, while sometimes risky and expensive, has the advantage of measuring properties of a formation before drilling fluids invade deeply. Further, many wellbores prove to be difficult or even impossible to measure with conventional wireline tools, especially highly deviated wells. In these situations, the LWD measurement ensures that some measurement of the subsurface is captured in the event that wireline operations are not possible. Timely LWD data can also be used to guide well placement so that the wellbore remains within the zone of interest or in the most productive portion of a reservoir, such as in highly variable shale reservoirs. LWD technology was developed originally as an enhancement to the earlier MWD technology to completely or partially replace wireline logging operation. With the improvement of the technology in the past decades, LWD is now widely used for drilling (including geosteering), and formation evaluation (especially for real time and high angle wells). (en) Logging while drilling (LWD) (traduzione letterale italiana: "Logging durante la perforazione") è una terminologia gergale inglese, ormai di utilizzo universale, per indicare una tecnica per la registrazione di log geofisici nel pozzo, simultaneamente alla sua perforazione, il posizionamento di questi strumenti nel foro, avviene inserendoli nella batteria di perforazione, come componenti della stessa, immediatamente dopo lo che ovviamente costituisce la parte finale della batteria. Gli strumenti LWD trasmettono i valori delle loro misurazioni da fondo foro alla superficie tramite appositi trasmettitori digitale di segnale, solitamente costituiti da un generatore di un impulsi discreti propagantisi nel fango di perforazione da fondo foro fino alla superficie. Questa trasmissione di segnale, che avviene con gli strumenti LWD nel pozzo durante le fasi di perforazione, è chiamata "trasmissione di dati in tempo reale". Contemporaneamente gli strumenti memorizzano un set più completo di dati in memorie EPROM contenute negli stessi, questi dati, chiamato "dati di memoria", vengono scaricati dagli strumenti LWD dopo che questi sono stati estratti dal foro. Il termine Measure While Drilling (MWD) (traduzione letterale italiana: "misurazione durante la perforazione"), simile allo LWD, indica anch'esso operazioni di misurazione durante la perforazione, ma viene riferito non a misurazioni geofisiche, ma a dati riguardanti la perforazione del foro, come l'angolo di deviazione del foro dalla verticale e l'azimut della direzione dello stesso, nel caso questo non sia perfettamente verticale, come in situazioni di perforazione direzionata. (it) |
| dbo:wikiPageExternalLink | https://web.archive.org/web/20070928175718/http:/www.geo365.no/sfiles/5/11/6/file/LoggingDemonstratingCapability_24-26.pdf https://web.archive.org/web/20121020114604/http:/www.halliburton.com/ps/default.aspx%3Fnavid=1757&pageid=125&prodgrpid=MSE%3a%3a1045758984896793 http://www.glossary.oilfield.slb.com/Display.cfm%3FTerm=Logging%20While%20Drilling |
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| gold:hypernym | dbr:Technique |
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| rdfs:comment | 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 LWD refers to measurements concerning the geological formation made while drilling.[1]LWD tools work with its measurement while drilling (MWD) system to transmit partial or complete measurement results to the surface via typically a drilling mud pulser or other improved techniques, while LWD tools are still in the borehole, which is called "real-time data". Complete measurement results can be downloaded (en) Logging while drilling (LWD) (traduzione letterale italiana: "Logging durante la perforazione") è una terminologia gergale inglese, ormai di utilizzo universale, per indicare una tecnica per la registrazione di log geofisici nel pozzo, simultaneamente alla sua perforazione, il posizionamento di questi strumenti nel foro, avviene inserendoli nella batteria di perforazione, come componenti della stessa, immediatamente dopo lo che ovviamente costituisce la parte finale della batteria. (it) |
| rdfs:label | Logging while drilling (it) Logging while drilling (en) |
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