Surveying Responsibilities:
1. Drilling manager:
- anti-collision strategy is in place;
- blow-out contingency plan is available to ensure that as soon as there is a potential or actual blow-out at any time during the life of a well, the planning of a relief well and the decision on its surface location can be made quickly;
- all non-magnetic tools and tubulars are regularly checked for magnetic hot-spots, and this is included in contracts for drilling services where NMDCs are supplied.
- a system in place for monitoring local magnetic field disturbances.
- geological target sizes and offsets are realistically specified in relation to survey accuracy and position uncertainty for the well;
- before a well is spudded close to any existing well, an anti-collision programme, incorporating all relevant data, is established;
- the borehole course is plotted and any potential collision risks are monitored;
- non-magnetic drillstring components are regularly inspected for magnetic hot spots;
2. Drilling Engineer:
·generating and checking collision risks between the planned well and existing wells;
·ensuring that the well plan and plot are checked independently by a second person;
·the survey data stored in the database is up-to-date;
·preparing a survey programme including planned wellpaths, plots etc.;
·ensuring that the well programmes have the appropriate survey programme;
·ensuring that the definitive survey data meet the requirements
3. Topographic Department:
·providing up-to-date reference details for wells such as wellhead co-ordinates, grid convergence and gyroscopic survey foresights.
4. Survey companies
·provide survey services in line with the requirements specified in the contract;·be involved with pre-job planning with the Drilling Engineer;
·inform the Wellsite Engineer of any unusual survey results or suspected poor quality data while running the survey;
·provide the necessary information in the final survey reports for the Drilling Engineer and Survey Focal Point to check the quality of the survey.
·maintain details and results of surveys, including tool and equipment calibration details;
·survey software and correctness of calculations;
·ensuring that data held in their survey database are up-to-date and the same as the data in the Opco's database;
·provide survey data on computer diskette for loading into the Opco database;
·provide magnetic survey data on diskette in correct format.