System and method for detecting casing in a formation using current
US8842020B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 12, 2009 |
| Grant date | Sep 23, 2014 |
| Priority date | — |
| Expiry date | Nov 11, 2031 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B47/022
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
The present disclosure is directed to systems and methods for relative positioning of wells. A method in accordance with an exemplary embodiment may include drilling a new well in a field having at least three completed wells using a drilling tool that includes a magnetometer. The method may further include driving current on a first pair of the at least three completed wells and then driving current on a second pair of the at least three completed wells, wherein the current is driven on each of the first and second pairs in a balanced mode. The method may also include measuring a direction of a first magnetic field generated by the current on the first pair using the magnetometer, measuring a direction of a second magnetic field generated by the current on the second pair using the magnetometer, and determining a location of the drilling tool relative to the completed wells based on the direction of the first magnetic field and the direction of the second magnetic field.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.