Measuring and testing – Borehole or drilling – Formation logging
Patent
1995-12-05
1996-12-17
Chilcot, Richard
Measuring and testing
Borehole or drilling
Formation logging
73594, 73606, 7315215, 7315247, 16625016, 1662551, 367 40, E21B 4700, G01V 100
Patent
active
055855563
ABSTRACT:
A method and equipment are described for performing measurements while drilling for oil or gas, in particular VSP-measurements employing a seismic source together with sensors such as hydrophones and/or geophones connected to a memory- and calculation device for storing and processing the seismic signals. The seismic source (2) is placed at or in the vicinity of the surface of the earth whereby signals generated by the source are detected by the hydrophones (3,5) or the geophones located in the vicinity of the source (2) at the surface and in the drill string (4). The geophones or the hydrophones (5) in the drill string transmit the detected signals to a memory- and calculation unit (6) in the drill string that processes and transmits the signals completely or partly to a central data processing unit (10) on the rig (7). The hydrophones or the geophones (3) at the surface simultaneously transmit the detected signals to the central data processing unit at the surface, while chronometers (8,9) showing identical times, connected to the source and to the memory- and calculation device in the drill string make possible a precise calculation of the travel time of the seismic signal between the source (2) and the geophones or the hydrophones in the drill string.
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Heggernes Rune
Petersen Steen A.
Chilcot Richard
Dombroske George M.
Norsk Hydro a.s.
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