26.1 Required Data

Experience has shown that the most common cause of an unexpected collision is lack of awareness of the very existence of the hazard well! It is essential that the following questions are asked before well planning
commences;
1. What are the sources of the client survey data?
2. How can we be sure that the data set is complete?
3. How does the database compare with the data held by the geoscientists, in-house surveyors and the
regulatory authorities?
4. Are we sure that all surveys are complete to TD?
5. Are all possible offset wells within reach of the current well included? (Be sure to include wells from
other sites if necessary and exploration wells).
6. Does the reference data agree with those held in other in-house databases and is it what the site
surveyors used when establishing site coordinates and directions?
The following information should be gathered and considered in detail prior to beginning the actual well planning
design process.