| 摘要 |
A method and apparatus for communicating to downhole oil or gas well equipme nt where the apparatus includes a drill pipe (22) for an oil or gas well including a generally cylindrical hollow drill pipe (22) having an inner diameter (24), an outer insulative coating (28) attached to the inner diamet er of the drill pipe (22), and a conductive coating (30) attached to the outer insulative coating (28). The drill pipe (22) further includes an inner insulative coating (32) attached to the conductive coating (30), wherein the outer insulative coating (28), the conductive coating (30) and the inner insulative coating (32) together define an insulated electrical pathway from an upper end (14) of the drill pipe (22) to a lower end (10) of the drill pi pe (22).
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