Systems, methods and apparatus for downhole monitoring of production conditions using EM telemetry
AssigneeGeo Psi Pty Ltd
InventorsQuentin Morgan, Michael Siefert
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Abstract
A gap sub for wellbore fluids comprises an electrical isolation structure to electrically isolate two metallic ends of the gap sub and a housing mounted outside of the gap sub. The housing accommodates an “external gap” and a toolstring for acquiring in-situ measurements of wellbore and near-wellbore conditions and transmitting the measurements to surface using EM telemetry. The gap sub comprises an antenna rod connected to the “external gap”, the antenna rod straddling the electrical isolation structure in the gap sub to be electrically isolated from one metallic end of the gap sub and electrically coupled to the other metallic end of the gap sub.
Claims21
A gap sub for wellbore fluids, the gap sub comprising:
- an electrical isolation structure to electrically isolate two metallic ends of the gap sub;
- a housing mounted outside of the gap sub, the housing accommodating an “external gap”, and a toolstring for acquiring in-situ measurements of wellbore and near-wellbore conditions and transmitting the in-situ measurements to surface using electromagnetic (EM) telemetry;
- and
- an antenna rod connected to the “external gap” in the housing, and the antenna rod straddling the electrical isolation structure in the gap sub to be electrically isolated from one metallic end of the two metallic ends of the gap sub and electrically coupled to another metallic end of the two metallic ends of the gap sub.
A method of acquiring in-situ measurements of wellbore and near-wellbore conditions and transmitting the in-situ measurements to surface using an electromagnetic (EM) telemetry, the method comprising:
- providing a gap sub between tubing joints in a tubing string for wellbore fluids, the gap sub comprising an electrical isolation structure to electrically isolate two metallic end members of the gap sub;
- mounting a housing outside of the gap sub, the housing accommodating an “external gap” and a toolstring for the EM telemetry;
- and
- connecting an antenna rod to the “external gap” to electrically isolate the antenna rod from one metallic end member of the two metallic end members, and the antenna rod straddling the electrical isolation structure in the gap sub, with another metallic end member of the two metallic end members of the antenna rod mechanically and electrically connected to the other metallic end member.
A system to acquire in-situ measurements of wellbore and near-wellbore conditions and transmitting the in-situ measurements to surface using an electromagnetic (EM) telemetry, the system comprising:
- a gap sub between tubing joints in a tubing string for wellbore fluids, the gap sub comprising an electrical isolation structure to electrically isolate two metallic ends of the gap sub;
- a housing mounted outside of the gap sub, the housing accommodating an “external gap” and a toolstring providing the EM telemetry;
- and
- an antenna rod connected to the “external gap”, and the antenna rod straddling the electrical isolation structure in the gap sub to be electrically isolated from one metallic end of the two metallic ends of the gap sub and electrically coupled to another metallic end of the two metallic ends of the gap sub.
Dependencies are inferred from the claim text.