Conventional Gyroscopic Survey Tools

The heart of a conventional gyroscope is the gyro wheel, which spins at high speed symmetrically about an axis. A perfect gyro wheel will maintain its orientation in inertial space for as long as no…

North Seeking gyro - Common tools description

Desription of typical North Seeking gyro:  Seeker (Baker Hughes Inteq), Wellbore surveyor (gyro/data), Finder (SDI), GCT (Schlumberger ), G2 (Sperry-Sun)

Seeker (Baker Hughes Inteq)

1 directional…

Introduction to Gyro Surveys

Gyro surveys will be taken when the casing has been run if it was not possible to perform an MMS in the open hole. There are two distinct groups of slim, surface reading, gyro surveying tools:

  1. those…

Conventional gyro: pre-survey checklist and running procedure

This article presents pre-survey checklist and running procedure for conventional gyro survey.

Pre-wellbore survey checklist

  • Before starting to drill a new well and before every new wellbore survey,…

Gyro Multi-Shots

Gyro Multi-Shots (GMS) shall only be run in preference to EMMS to verify the surveys used to drill a hole section where magnetic interference may not be corrected. Gyro Multi-Shots are also used for…

Gyro Single Shots

The Gyro Single Shot is used for orienting purposes only. While drilling, Gyro Single Shot surveys shall be taken instead of magnetic surveys or  MWD whenever magnetic interference may be…

Gyro Surveys - QA/QC

QA/QC Instrument Tests to be performed for Gyro Surveys.

1. Inclination Values (In-run and Out-run)

The variance between the in-run and out-run inclination values for survey data from the same survey…

North seeking gyro survey tools

North Seeking gyro directional drilling survey tools provide substantially more accurate survey data than conventional gyro tools. In the conventional gyroscopic survey tool, the gyro is oriented to a…