Patent ID: 11905823
Assignee: DYNAENERGETICS EUROPE GMBH
Field: Civil engineering (Other fields)
Classification: CPC E  H | IPC E  H

Claim 8:
9. A system for determining a location of an untethered drone in a wellbore, the system comprising:
a plurality of receiving zones defined by a plurality of respective circlets positioned within a wellbore casing in an axially spaced relation to one another, the plurality of circlets including a first circlet having a plurality of markers disposed around a circumference of the wellbore casing, the plurality of markers including a first marker configured to transmit a first periodic signal during a first time period, and a second marker configured to transmit a second periodic signal during a second time period, the first time period and the second time period being different time periods; and
a marker receiver configured to be transported into the wellbore casing by the untethered drone, wherein the marker receiver is configured for receiving at least one of the first periodic signal or the second period signal,
wherein a first receiving zone of the plurality of receiving zones does not overlap a second receiving zone of the plurality of receiving zones or the marker receiver is configured to distinguish between the first receiving zone and the second receiving zone.