Acquire a Velocity Survey in Your Well with ZERO Rig Time
Speaker: C. Peter Deri
Geophysical Domain Champion
Schlumberger Drilling & Measuremnents
Houston
Texas
Biography:
C. Peter Deri was born in Budapest Hungary. He moved to the United States in 1968 and graduated from Cornell University with a Bachelors Degree in Electrical Engineering in 1979. Hired by Schlumberger in 1979, he started as a Field Engineer in Morgan City, Louisiana. Throughout his career with Schlumberger, Peter progressed from Field Engineer to Division Geophysicist to his present position as Geophysical Domain Champion for Drilling and Measurements.
Abstract:
The seismic VISION service allows borehole seismic data to be acquired in real time while drilling operations continue. With geophones and hydrophones in the BHA, a signal from a surface source can be recorded while the pipe is stationary, in slips, and the mud pumps are turned off.
With the pipe hanging in the slips and the mud pumps off, the wellbore environment is quiet enough to record quality first arrivals from a surface source. These first arrival times and waveforms are recorded downhole and may be transmitted to the surface via high-speed mud pulse telemetry as soon as the mud pumps are turned back on. This "real time" data transmission results in improved quality control of the downhole checkshot measurements and has the added potential to image over a thousand feet ahead of the bit (Vertical Seismic Profile) while drilling.
VSP services are usually acquired in open hole or cased holes as a wireline service, requiring a separate logging run at the end of the logging program. This While Drilling service allows acquisition of a VSP in real time while drilling continues. Any and every time that the pipe is in the slips and the mud pumps are off, the surface source gun array is fired and data is recorded downhole in the BHA. As soon as the pipe is moved out of the slips and the pumps are turned back on source firing stops and data transmission begins. As an industry first, waveforms can be transmitted in "real time" from the tool to surface during acquisition, greatly enhancing quality control and data processing. As a consequence, we can provide Time/Depth pairs and VSP images to the operator while drilling.