Method and apparatus for determining and displaying geosteering information

摘要

A method and system to render a graphic display that includes a color-coded risk indicator to facilitate the steering of a drill string during subterranean drilling. The system comprises a receiver to receive measurement data from downhole instrumentation forming part of the drill string during the drilling of a well bore in a geological formation, and an exit risk determining module to determine an exit risk value based at least in part on the measurement data. The exit risk value is indicative of a risk of exiting of the formation by the drill string. A display module is provided to render the graphic display of decision information, to assist steering of the drill string. The color-coded exit risk indicator comprises a colored area having a color indicative of the exit risk value, the color of the colored area being changeable in response to changes in the exit risk value. The graphic display may show a wellbore trajectory in relation to a formation boundary, with the color-coded risk indicator comprising an area extending between the wellbore trajectory and the formation boundary.

主权项

1. A system comprising:
a receiver to receive measurement data from downhole instrumentation forming part of a drill string during the drilling of a well bore in a geological formation; an exit risk determining module comprising one or more processors, to determine an exit risk value based at least in part on the measurement data, the exit risk value being indicative of a risk of exiting of the formation by the drill string; and a display module to render on a display device a graphic display of decision information to assist steering of the drill string, the graphic display including a color-coded exit risk indicator comprising a colored area having a color indicative of the exit risk value, the graphic display to show a well bored trajectory in relation to a formation boundary, the color coded exit risk indicator comprising a portion of an area extending between the displayed well bore trajectory and the displayed formation boundary, the color of the colored area being changeable in response to changes in the exit risk value.