ISCWSA validation of uncertainty and anti-collision calculations in Oliasoft WellDesign's Trajectory Design module
The ISCWSA provides comprehensive datasets and spreadsheets for validating software calculations. These resources ensure that software implementations adhere to recommended methods for calculating uncertainties and anti-collision models.
This validation involves testing our software against ISCWSA's published example datasets. Oliasoft WellDesign has recreated all scenarios presented by ISCWSA to validate our uncertainty and anti-collision calculations in the Oliasoft Trajectory module.
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Key Components of ISCWSA Validation
Example datasets include:
- Case #1: Three individual wellbores with NEV cov/uncertainties results for validating ISCWSA Uncertainty Models.
- Case #2: A field with a reference well and eleven offset wellbores all provided with EOU, center-to-center distance, and clearance/separation factor results for validating Anti-collision calculations.
Uncertainty and Anti-Collision Calculations:
- The datasets contain detailed trajectory inputs such as wellbore parameters, geomagnetic models, and survey error models - and verified results.
- Calculations are based on the latest revision of ISCWSA models and methodologies presented by Williamson.
Case #1 - Validating ISCWSA Uncertainty Models
- Plots of total COV element results from ISCWSA compared to Oliasoft WellDesign results.
- Oliasoft results are plotted as solid grey lines, while ISCWSA results as dotted lines.
Image 2: Calculated Covariance Matrix Elements from Oliasoft WellDesign and ISCWSA datasets, #1
Image 3: Calculated Covariance Matrix Elements from Oliasoft WellDesign and ISCWSA datasets, #2
Image 4: Calculated Covariance Matrix Elements from Oliasoft WellDesign and ISCWSA datasets, #3
Case #2 - Validating Anti-Collision Calculations
Comparison of verified ISCWSA results against Oliasoft WellDesign calculations.
Focus areas include validation of:
- Ellipse of uncertainty (EOU) major axis
- Center-to-center distance
- Clearance/separation factor calculations.
The below results show a comparison of the verified results presented from ISCWSA against the calculated results produced in Oliasoft WellDesign. The presented validation follows the same format with Oliasoft results plotted as solid grey lines against dotted lines from ISCWSA.
The comparison will be presented to compare:
Image 5: Wellbores from case #2 plotted in Oliasoft WellDesign’s 3D viewer
1. Uncertainty major axis:
Image 6: Calculated EOU major axis from Oliasoft WellDesign and ISCWSA dataset #2
Image 7: Calculated EOU major axis from Oliasoft WellDesign and ISCWSA dataset #2
2. Center-to-center distance calculation:
Image 8: Calculated center-to-center distance from OWD and ISCWSA
Image 9: Calculated center to center distance from Oliasoft WellDesign and ISCWSA
3. Clearance/Separation factor calculation:
Image 10: Calculated clearance/separation factors from Oliasoft WellDesign and ISCWSA
Image 11: Calculated clearance/separation factors from Oliasoft WellDesign and ISCWSA
Implications for the Industry
By validating Oliasoft WellDesign against ISCWSA standards, we demonstrate our commitment to accuracy and reliability in wellbore surveying. This rigorous validation process ensures that our software meets industry standards, providing our clients with confidence in their wellbore modeling and surveying results. Our alignment with ISCWSA standards underscores our dedication to maintaining industry best practices and fostering a collaborative understanding of wellbore surveying challenges.
For detailed information on the ISCWSA validation process and access to the example datasets, please visit the following links:
- ISCWSA Clearance Test Word Document
- ISCWSA Clearance Test Excel Sheet
- ISCWSA Error Model Example File 1
- ISCWSA Error Model Example File 2
- ISCWSA Error Model Example File 3
By continually validating and refining our software, Oliasoft WellDesign remains at the forefront of wellbore surveying technology, ensuring precision and safety in all drilling operations.