E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
E21B 7/06 (2006.01) E21B 47/022 (2006.01)
Patent
CA 2689815
A method to guide a drilling path of a second well (12, 80) in close proximity to a first well (10, 102) including: electrically connecting a source of a time varying electrical current (26, 70) to both a proximal end and a distal end (106) of a conductive casing (68) or liner; applying the time varying electrical current directly to the conductive casing or liner of the first well such that current (62, 114) flows in a common direction through substantially an entire length of the casing or liner, wherein the electrical current is injected at one end of the casing or liner and flows to an opposite end of the casing or liner; drilling the second well (12) along a drilling trajectory (86); from the second well, sensing (44, 46, 48, 52, 88) an electromagnetic field generated by the time varying electrical current in the casing or liner of the first well, while the time varying electrical current is applied to the casing or liner of the first well; determining a distance and a direction between the first well and the second well, and guiding the drilling trajectory of the second well using the determined distance and direction to maintain a separation between the second well and the first well.
Meador Edwin L.
Waters Robert L.
Company General Electric
Craig Wilson And Company
LandOfFree
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