A model is only as reliable as the data fed into it. Petrel supports a wide array of industry-standard file formats for seismic, well, and spatial data.
What specific you are working with (e.g., core data, 2D vs. 3D seismic)? Which Petrel version license you are currently running?
The Ultimate Petrel Tutorial: A Step-by-Step Guide to Seismic Interpretation and 3D Geological Modeling
Import directional survey files ( .dev or text formats) mapping Measured Depth (MD) against Inclination and Azimuth to accurately plot the wellbore path in 3D space.