EARTH SURVEYING FOR IMPROVED DRILLING APPLICATIONS

摘要

Methods and apparatuses for geophysical surveying are disclosed. In one embodiment, a marine vehicle may obtain magnetic measurements in a location around a drilling site. The magnetic measurements may be used to calculate a localized disturbance magnetic field resulting from, for example, solar flares. The localized disturbance magnetic field may be used to calculate a declination value and, thus, a wellbore position with improved accuracy.

主权项

1. A system, comprising:
a processing system configured to receive magnetic measurements from a magnetic measurement device, the processing system comprising at least one processor configured to perform steps comprising:
determining a crustal field based on the received magnetic measurements;calculating a localized magnetic disturbance field in an area local to a location corresponding to the received magnetic measurements,wherein the localized magnetic disturbance field is related to solar activity and independent of a main field and independent of the crustal field, andwherein the localized magnetic disturbance field is calculated by subtracting one of the received magnetic measurements from the determined crustal field; andcalculating a wellbore position based, at least in part, on the calculated localized magnetic disturbance.