Invention Grant
- Patent Title: Gradient-based single well ranging system for SAGD application
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Application No.: US14440329Application Date: 2013-12-06
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Publication No.: US10429534B2Publication Date: 2019-10-01
- Inventor: Burkay Donderici , Clinton Moss , Mac Upshall
- Applicant: Halliburton Energy Services Inc.
- Applicant Address: US TX Houston
- Assignee: Halliburton Energy Services, Inc.
- Current Assignee: Halliburton Energy Services, Inc.
- Current Assignee Address: US TX Houston
- Agency: Haynes and Boone, LLP
- International Application: PCT/US2013/073706 WO 20131206
- International Announcement: WO2014/089505 WO 20140612
- Main IPC: G01V3/00
- IPC: G01V3/00 ; G01V3/26 ; G01V3/18 ; G01V3/02 ; G01V3/20 ; G01V3/08 ; E21B47/022

Abstract:
A tool, method and system for ranging between two wellbores. The target wellbore includes a conductive member disposed within a portion of the target wellbore. An investigative wellbore includes an electromagnetic gradiometer positioned within the wellbore, as well as emitter electrode and return electrode spaced apart along an investigative wellbore, preferably in the process of being drilled. The position of the emitter electrode and the return electrode are selected to optimize current transmission to the target wellbore in order to enhance the electromagnetic field emanating from the conductive member at a desired point along the conductive member. Where the electrodes and gradiometer are carried by a drill string, gap subs are positioned along the drill string to minimize conduction of current along the drill string therebetween. In some embodiments, the gradiometer is positioned between the emitter and return electrodes.
Public/Granted literature
- US20150268371A1 GRADIENT-BASED SINGLE WELL RANGING SYSTEM FOR SAGD APPLICATION Public/Granted day:2015-09-24
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