Geo-Guide ALC™

Gyrodata's Advanced Logging Combination System is a major breakthrough in wellbore surveying instrumentation, providing operators with cost savings, a highly accurate wellbore delineation and enhanced positioning within the reservoir.

Design / Operation
A 3 3/8" OD logging tool housing has been modified to contain a specially designed rate continuous gyro logging system cartridge, which enables simultaneous operation and data transmission with virtually all currently available open and cased hole logging tools.

• Logging combinations are now possible in horizontal cased and open holes.
• Deployed using wireline, pipe conveyance or downhole tractors.
• Simultaneous data transmission.
• 22 Hz data sampling.
• Measures exact wireline cable stretch.
• Logging speeds are dependent upon the main logging tool.
• 150 Deg C. rating for unlimited time.
• 250 Deg C. high temperature option.

Advantages / Benefits

• Substantial rig time savings.
• Better well placement within the resevoir.
• Orientation of imaging tools.
• Elimination of depth uncertainty between LWD, Wireline Logs and Gyro Surveys.
• Improved positional accuracy.
• Improved alonghole depth accuracy.
• Very high resolution log provides exact wellbore profiling.
• Orientation of wireline orientated perforating tools.
• Highly accurate definitive true vertical depth versus gamme ray log for the well.
• Identifies wellbore tortuosity, porpoising and macro doglegs.

Case histories
Over 780 Geo-Guide ALC runs and 7 million feet surveyed worldwide with three major logging companies as of January 2008

• Middle East, Schlumberger: 7" liner and 6" open hole, 9,800', 30° Inclination Deviated Wireline Log, Geo-Guide ALC (Rate Continuous), Gamma Ray, Spherical Resistivity Tool, Dual Lateral Logging Tool.
• Trinidad, Schlumberger: 9 5/8" casing, 5,494', 37° Inclination, Wireline Conveyed, Geo-Guide ALC (Rate Continuous), Gamma Ray, USIT.
• Middle East, Baker Atlas: 9 5/8" casing and 7" liner, 12,000', 92° Inclination, Pipe Conveyed, Geo-Guide ALC (Memory and Rate Continuous), CCL, Gamma Ray, Compensated Neutron, Acoustic Digitizer, Cement Bond Tool.
• U.K. North Sea, Baker Atlas: 7" liner and 5" liner, 18,500', 65° Inclination, Wireline Conveyed, Geo-Guide ALC (Rate Continuous), Gamma Ray, Cement Bond Log.
• Mexico, PEMEX: 7" liner, 14,072', 21° Inclination, Wireline Conveyed, Geo-Guide ALC (Rate Continuous), Gamma Ray, Cement Bond Log.