Downhole telemetry system
AssigneeSchlumberger Technology Corporation
InventorsMatthe Contant, Erwann Lemenager, Yves Mathieu, Sylvain Chambon
Life of this patent
Estimating the term…
Abstract
An EM antenna for location on a pipe (10) surrounded by a casing (12). The antenna has a power source (21) for injecting a current across a first insulated section (25) of the pipe (10) and an electrode (22) for conducting the current from the pipe (10) to the casing (12). There is also a second insulated section (23) of the pipe arranged to operate together with the electrode (22) and first insulated section (25) for directing a path flow of the current. Such antennas are described both in relation to repeater arrangements as well as land and sea applications.
Claims39
An antenna located on a pipe surrounded by a casing, the antenna comprising:
- a power source to inject a current across a first insulated section of the pipe;
- an electrode to conduct the current from the pipe to the casing;
- and
- a second insulated section of the pipe to operate with the electrode and first insulated section to direct a flow path of the current, wherein the second insulated section is to substantially prevent leakage of the current into a gap between the pipe and the casing;
- wherein the antenna is to communicate wirelessly with a similar antenna located on the pipe.
The antenna of claim l, wherein the antenna is to communicate with a plurality of antennas located along the pipe to wirelessly transfer a signal from a first end of the pipe to a second end of the pipe.
The antenna of claim l, wherein the antennas are located on the pipe at sections above and below a well head location of the pipe.
An antenna to be disposed downhole on a pipe surrounded by a casing, the antenna comprising:
- a power source to inject a current across a first insulated section of the pipe, the first insulated section providing an electrical discontinuity in the pipe;
- a first electrode to conduct the current from a first location of the pipe to the casing;
- a second electrode to conduct the current from the casing to a second location of the pipe;
- and
- a second insulated section insulating a portion of a length of the pipe, the second insulated section including an insulator between the pipe and the casing to direct the current along the pipe;
- wherein the antenna is to communicate wirelessly with a similar antenna located on the pipe.
An antenna to be disposed downhole on a pipe surrounded by a casing, the pipe having a plurality of segments joined at respective stand-off points, the antenna comprising:
- a power source to inject a current across a first insulated section of the pipe, the first insulated section providing an electrical discontinuity in the pipe;
- a first electrode to conduct the current from a first location of the pipe to the casing;
- a second electrode to conduct the current from the casing to a second location of the pipe;
- a second insulated section insulating a portion of a length of the pipe between the power source and the first insulated section;
- and
- a set of discrete insulated sections insulating the respective stand-off points to insulate the pipe from the casing;
- wherein the antenna is to communicate wirelessly with a similar antenna located on the pipe.
Dependencies are inferred from the claim text.