초록 ▼

A system and method are disclosed for wireless two-way communication in a cased borehole having tubing extending therethrough. A downhole communications subsystem is mounted on the tubing. The downhole subsystem includes a downhole antenna for coupling electromagnetic energy in a TEM mode to and/or

A system and method are disclosed for wireless two-way communication in a cased borehole having tubing extending therethrough. A downhole communications subsystem is mounted on the tubing. The downhole subsystem includes a downhole antenna for coupling electromagnetic energy in a TEM mode to and/or from the annulus between the casing and the tubing. The downhole subsystem further includes a downhole transmitter/receiver coupled to the downhole antenna, for coupling signals to and/or from the antenna. An uphole communications subsystem is located at the earth\s surface, and includes an uphole antenna for coupling electromagnetic energy in a TEM mode to and/or from the annulus, and an uphole receiver/transmitter coupled to the uphole antenna, for coupling the signals to and/or from the uphole antenna. In accordance with a feature of the invention, the annulus contains a substantially non-conductive fluid (such as diesel, crude oil, or air) in at least the region of the downhole antenna and above.

대표청구항 ▼

For use in an earth borehole which is cased with an electrically conductive casing and has electrically conductive tubing extending through the casing and spaced from the casing; a communication system for communicating between downhole and the earth\s surface, comprising: a downhole communications

For use in an earth borehole which is cased with an electrically conductive casing and has electrically conductive tubing extending through the casing and spaced from the casing; a communication system for communicating between downhole and the earth\s surface, comprising: a downhole communications subsystem mounted on said tubing, said subsystem including: a downhole toroidal antenna means concentric the tubing for coupling electromagnetic energy in a TEM mode to the annulus between said casing and tubing and a downhole receiver coupled to said downhole antenna means for coupling signals to said antenna means; an uphole communications subsystem at the earth\s surface, including: uphole antenna means and an uphole receiver, said uphole antenna means coupling electromagnetic energy in a TEM mode from said annulus to said receiver; substantially non-conductive fluid in said annulus in at least the region of said downhole antenna means and above; and conductive means below said downhole communications subsystem for electrically coupling said tubing and casing.