The Memory North-Seeking Gyro (NSG-MS) system operates in multi-shot mode on any slick line or braided line. The system is battery powered and records survey data using a memory module. The tool can be programmed to suit the application and is armed at surface by the user.

In addition surveys can be conducted whilst tripping the drill pipe. The gyro is run into the well on a J-Slot release assembly. Once at the landing point the tool is released, the wire-line is pulled out of hole at high speed and the survey conducted whilst the pipe is tripped.

At only 42mm OD the instrument is small and rugged and incorporates the latest north seeking gyro technology, combined with advanced electronics to provide high accuracy and reliability.

Unlike conventional gyros the North-Seeking Gyro module will not drift over time. The necessity for surface referencing (gyrocompass alignment) is also eliminated due to the North-Seeking capabilities of the gyro module.

APPLICATIONS:

The most common applications are:

• Accurate delineation of drill path - free from magnetic interference
• Cased hole / in-rod surveying applications
• Whipstock / DHM and other kickoff orientations

ADVANTAGES:

• Does not require dedicated wire-line unit
• Can survey while tripping pipe
• Short length, small OD and light weight
• Accurate and reliable
• Not affected by magnetic interference from drill pipe or magnetic rock formations
• Lengthy field calibrations are not required prior to each survey
• Surface referencing is not required as it is true north seeking
• Drill collar azimuth does not need to be pre-determined
• Does not drift over time, each survey station is independent of the previous one