RGS Tandem Operation (RGS-TD)

Gyrodata's unique ability to operate its rate-gyroscopic survey systems in tandem with logging instrumentation has provided operators $1,000's in rigtime savings...

3.5" OD Probe in Tandem
with Logging Tool

Innovation
Gyrodata began operating its high accuracy rate-gyroscopic survey instrumentation in tandem with other downhole systems in 1985. Initial interest had come from the geophysical industry, which needed orientation of tri-axis geophones in borehole seismic operations. Gyrodata patented the process in 1986.

Rigtime Savings
While the orientation of the geophone was important (we still run oriented VSP's on a regular basis), it followed that running two or more services in one run represented significant savings in time and wireline charges.
Subsequently, Gyrodata pursued joint operations with all the major logging companies, and to date we have performed over 1,000 tandem runs worldwide.

Example

• Rig cost per hour: $10,000
• Survey 14,000 feet
• Gyrocompass survey on wireline: 6.4 hours rigtime.
• Rate-gyro continuous survey in tandem with cement bond log: 50 minutes added for inrun survey.
• Savings: 5.6 hours, or $56,000 in time savings and wireline charges.

Operational Versatility
Gyrodata can run its electric wireline systems in tandem with virtually any logging instrument with a thru-wire. The survey probe runs on bottom.
Typically, the gyro survey is run on the inrun, and the log is run on the outrun. The survey can be in continuous mode, at up to 300'/minute, or in gyrocompass mode, stopping at 100-foot intervals. Survey performance is monitored realtime at surface.
If there is no thru-wire, the battery-powered surveyor (RGS-BT) can be run. Survey data is downloaded at surface upon retrieval of the tool.

Tandem Services

Logging
Rate-gyro tools are run with such instruments as cement bond logs, gamma/neutron logs, and pressure/temperature instruments. In addition to saving time, the combination of survey and logging information can significantly enhance data correlation with respect to depth or orientation of the logging sensor.

Tri-axis Geophones
Rate-gyros are run in tandem with geophones to collect orientation data in borehole seismic operations when a high degree of accuracy is required, or if the direction of the surface signals is deflected by a structure such as a salt dome.

Rate-gyro systems are also run in tandem with geophones in fracturing operations and cross borehole seismic studies.