MCJV The Narrows Gladstone – Gyro Survey

Client: MCJV

Services Provided: Gryo Survey

Completion Date: June 2013

Project Scope of Work:  

Stockton’s were engaged by MCJV to conduct an end to end survey of their fluid filled 6 5/8” drill pipe. The 1,525m crossing had originally been drilled for a fibre optic cable, however it was considered that the profile might be suitable for the installation of a steel 42” gas pipeline.

Adjacent to the crossing was a large piled cofferdam and numerous screwed piles used for the causeway and bridges for the Narrows construction. These structures had caused magnetic interference issues and positional uncertainty during drilling. By conducting an independent gyro survey the pipeline owner can confirm the exact position and bend radius of the installed pipe without magnetic interference.

The gyro was run several times from end to end using Stockton’s variable speed and torque electrical winches, with each survey pass taking approximately 40 minutes to survey the 1,525m distance. The data was immediately processed on site and the bend radius and positional data transferred directly to the drilling superintendent, thereby minimising any operational downtime.

Results and Client Benefit: 

The survey provided the required confirmation of bend radius and position of the duct, allowing for crucial decisions to be made about the bore.