A list and description of all MWD STD features
| Feature | Description |
|---|---|
| High-definition geomagnetic reference | A global and crustal Earth’s magnetic field model similar to HDGM, that implements calculation of the reference along trajectory |
| Gravity model | International Gravity Formula 1980 (IGF80) based on the WGS80 ellipsoid |
| Grid convergence | UTM grid convergence calculation |
| Estimated drillstring interference (EDI) | A novel method for the drillstring interference prediction based on BHA design, magnetic hysteresis modeling and remagnetization cycles simulation |
| Calibration of EDI model | A novel method for calibration the EDI model on the BHA design and MWD measurements |
| Survey filtering | A smart algorithm for bad MWD survey filtering |
| Failed axis detection | An algorithm for automatic detection of the failed D&I axis |
| Enhanced failed axis correction | An enhanced correction of the failed D&I axis |
| MSA uncertainty prediction | An algorithm to predict MSA correction uncertainty |
| Enhanced MSA correction | A next generation MSA correction algorithm that ensures the best reachable accuracy by utilization of all available drilling information |
| Enhanced accelerometer correction | An algorithm for high precision correction of the z-axis accelerometer measurement for the horizontal tangent section |
| MSA accuracy analysis | An algorithm for aposteriori accuracy analysis of the MSA correction |
| Survey quality check | A comprehensive novel algorithm for survey quality evaluation |
| Enhanced failed axis correction | An algorithm of the outstanding accuracy for the D&I failed axis calculation |
| Enhanced BHA sag correction | An improved FEM based sag correction algorithm |
| Sag correction uncertainty | A module for sag correction uncertainty analysis |
| Soft T&D and buckling model | A module for torque and drag calculation with the drill pipe buckling modeling |
| High-definition trajectory | An algorithm for calculation of the high-definition trajectory based on fusion of continuous inclination measurement and static surveys |
| BHA DLS performance analysis | An algorithm for BHA performance analysis based on the slide sheet and MWD surveys |
| Projection to the bit | An algorithm for projection-to-the-bit calculation based on BHA performance analysis |
| Ellipsoid of uncertainty | A novel EOU calculation method, that models MSA correction uncertainty and considers partial correlation of the errors |
| Anti-collision scan | An algorithm implements analysis of Oriented Separation Factor for the novel EOU method |
| MWD-Gyro fusion | An elaborated algorithm of SPE 85111 calculates the well path with the best achievable accuracy based on the MWD-Gyro fusion |
| Declination uncertainty inference | An algorithm to estimate actual declination accuracy of the high-definition geomagnetic model based on MWD measurements |
| Survey toolcode proposal | An algorithm for automatic toolcode proposal |