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US 9,316,758 B2Granted
Earth surveying for improved drilling applications
AssigneeLiquid Robotics Oil and Gas LLC
InventorsSudhir Pai, Benny Poedjono, Graham Lancaster Hine
Life of this patent
Estimating the term…
Abstract
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.
Claims19
A method, comprising:
- receiving a magnetic field measurement for a location from a vehicle at the location, wherein the magnetic field corresponds to measurements below a surface level;
- monitoring a magnetic field at the location to determine a crustal field at the location;
- calculating a localized magnetic disturbance related to solar activity and independent of a main field and independent of the crustal field based, at least in part, on the received magnetic field measurement by subtracting the magnetic field measurement from the crustal field;
- and
- calculating a wellbore position based, at least in part, on the calculated localized magnetic disturbance.
2 more elements
An apparatus, comprising:
- a marine vehicle;
- a magnetic measurement device, the magnetic measurement device configured to obtain magnetic measurements below a surface level for drilling calculations, the magnetic measurement device attached to the marine vehicle, and wherein the marine vehicle is configured to monitor a magnetic field at a location to determine a crustal field at the location;
- a processing system attached to the marine vehicle, the processing system configured to receive magnetic measurements from the magnetic measurement device and to transmit the magnetic measurements to a magnetic observatory for calculating a wellbore position based, at least in part, on a calculated localized magnetic disturbance related to solar activity and independent of a main field and independent of the crustal field, wherein the calculated localized magnetic disturbance is calculated by subtracting a magnetic field measurement of the magnetic measurements from the determined crustal field.
A system, comprising:
- at least one marine vehicle having a magnetic measurement device for obtaining magnetic measurements below a surface level for drilling calculations;
- and
- a processing station configured to receive magnetic measurements from the at least one marine vehicle, the processing station comprising:
- a memory for storing the received magnetic measurements;
- and
- a processor, in which the processor is configured to perform the steps of:
- processing the received magnetic measurements;
- determining a crustal field based on the received magnetic measurements;
- calculating a localized magnetic disturbance field in an area local to a magnetic measurement related to solar activity and independent of a main field and independent of the crustal field by subtracting one of the received magnetic measurements from the determined crustal field;
- and
- calculating a wellbore position based, at least in part, on the calculated localized magnetic disturbance field.
8 more elements
Dependencies are inferred from the claim text.