Invention Grant
- Patent Title: Electromagnetic logging between a cased borehole and surface
- Patent Title (中): 套管井眼与表面之间的电磁测井
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Application No.: US12705826Application Date: 2010-02-15
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Publication No.: US09035657B2Publication Date: 2015-05-19
- Inventor: Hong Zhang , Richard A. Rosthal
- Applicant: Hong Zhang , Richard A. Rosthal
- Applicant Address: US TX Sugar Land
- Assignee: Schlumberger Technology Corporation
- Current Assignee: Schlumberger Technology Corporation
- Current Assignee Address: US TX Sugar Land
- Agent Cathy Hewitt; Michael Dae
- Main IPC: G01V3/10
- IPC: G01V3/10 ; G01V3/28

Abstract:
The present disclosure relates to systems and methods for conducting an electromagnetic borehole-to-surface survey of a formation surrounding a borehole. Such methods include deploying a dipole transmitter into the borehole to a depth of investigation, deploying an array of electromagnetic receivers outside of the wellbore, and measuring a response of the formation at the array of electromagnetic receivers deployed outside of the wellbore, for example at the surface. From the response of the formation a property of the formation can be determined based on the response of the formation measured at the array of electromagnetic receivers. For the scenario of a cased well, a local reference receiver may be added at a location proximate the borehole to measure the effective magnetic moment of the transmitter inside the casing, and normalize the formation response in order for a more accurate determination of a formation characteristic, such as resistivity. These receivers can also be used for other types of surveys.
Public/Granted literature
- US20100259268A1 ELECTROMAGNETIC LOGGING BETWEEN A CASED BOREHOLE AND SURFACE Public/Granted day:2010-10-14
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