A drilling rig is used to create a borehole or well (also called a wellbore) in the earth's sub-surface, for example in order to extract natural resources such as gas or oil. During such drilling, data is acquired from the drilling rig sensors for a range of purposes such as: decision-support to monitor and manage the smooth operation of drilling; to make detailed records (or well log) of the geologic formations penetrated by a borehole; to generate operations statistics and performance benchmarks such that improvements can be identified, and to provide well planners with accurate historical operations-performance data with which to perform statistical risk analysis for future well operations. The terms measurement while drilling (MWD), and logging while drilling (LWD) are not used consist
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| - Bohrlochvermessung (de)
- Measurement while drilling (en)
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| - Bei modernen Erdöl- und Erdgasbohrungen werden, vor allem im Offshore-Bereich mehrere Bohrungen von einer Bohrplattform abgeteuft. Um Kollisionen der einzelnen Bohrungen zu vermeiden, ist es notwendig, den genauen Verlauf der einzelnen Bohrungen zu bestimmen. Wegen der Ablenkung des Erdmagnetfeldes durch bereits im Boden befindliche Schutzverrohrungen ist es nicht möglich, diese Vermessungen mittels Magnetkompass durchzuführen. Man verwendet hierzu Kreiselkompasse oder neuerdings auch inertiale Navigationssysteme, die meist an einem Messkabel in die Bohrung abgelassen werden. Kreiselkompasse übertragen Richtung und Neigung der Bohrung an die Oberfläche, wo dann die Trajektorie des Bohrlochs berechnet wird. Inertiale Navigationssysteme berechnen direkt ihren zurückgelegten Weg durch doppelt (de)
- A drilling rig is used to create a borehole or well (also called a wellbore) in the earth's sub-surface, for example in order to extract natural resources such as gas or oil. During such drilling, data is acquired from the drilling rig sensors for a range of purposes such as: decision-support to monitor and manage the smooth operation of drilling; to make detailed records (or well log) of the geologic formations penetrated by a borehole; to generate operations statistics and performance benchmarks such that improvements can be identified, and to provide well planners with accurate historical operations-performance data with which to perform statistical risk analysis for future well operations. The terms measurement while drilling (MWD), and logging while drilling (LWD) are not used consist (en)
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| - Bei modernen Erdöl- und Erdgasbohrungen werden, vor allem im Offshore-Bereich mehrere Bohrungen von einer Bohrplattform abgeteuft. Um Kollisionen der einzelnen Bohrungen zu vermeiden, ist es notwendig, den genauen Verlauf der einzelnen Bohrungen zu bestimmen. Wegen der Ablenkung des Erdmagnetfeldes durch bereits im Boden befindliche Schutzverrohrungen ist es nicht möglich, diese Vermessungen mittels Magnetkompass durchzuführen. Man verwendet hierzu Kreiselkompasse oder neuerdings auch inertiale Navigationssysteme, die meist an einem Messkabel in die Bohrung abgelassen werden. Kreiselkompasse übertragen Richtung und Neigung der Bohrung an die Oberfläche, wo dann die Trajektorie des Bohrlochs berechnet wird. Inertiale Navigationssysteme berechnen direkt ihren zurückgelegten Weg durch doppelte Integration der Beschleunigungswerte und die Richtung durch Integration der durch Gyroskope gemessenen Drehraten. (de)
- A drilling rig is used to create a borehole or well (also called a wellbore) in the earth's sub-surface, for example in order to extract natural resources such as gas or oil. During such drilling, data is acquired from the drilling rig sensors for a range of purposes such as: decision-support to monitor and manage the smooth operation of drilling; to make detailed records (or well log) of the geologic formations penetrated by a borehole; to generate operations statistics and performance benchmarks such that improvements can be identified, and to provide well planners with accurate historical operations-performance data with which to perform statistical risk analysis for future well operations. 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 MWD refers to directional-drilling measurements, e.g., for decision support for the wellbore path, (Inclination and Azimuth) while LWD refers to measurements concerning the geological formations penetrated while drilling. (en)
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