ConocoPhillips
IFR1 survey methodology

Abstract:

An improved in-field referencing 1 (IFR1) technique is provided, wherein a single mid-lateral well measurement of local magnetic field is used. In one aspect of directional drilling, a single set of IFR values for a planned well is obtained. The single set of IFR values is captured at a single location in a mid-lateral section of the planned well. A global magnetic model corresponding to the Earth's magnetic field is obtained. An improved magnetic model is generated by correcting the global magnetic model for local anomalies using the single set of IFR values.