A method includes detecting, via first and second receivers of a tool that are oriented at a first and a third tilt angle, respectively, a first and second measurement of a first signal transmitted by a transmitter of the tool that is oriented at a second tilt angle into a substantially non-conductive material. The method includes determining, based on the first and second measurements, a first tensor and conveying the tool into a first wellbore formed in a subsurface formation. The method includes detecting, via the first receiver and the second receiver, a third and fourth measurement, respectively, of a second signal transmitted by the transmitter and determining, based on the third and fourth measurements, a second tensor and determining a third tensor (having values independent of the first, second, and third tilt angles) based on a relationship between the first and second tensors.

A method includes detecting, via first and second receivers of a tool that are oriented at a first and a third tilt angle, respectively, a first and second measurement of a first signal transmitted by a transmitter of the tool that is oriented at a second tilt angle into a substantially non-conductive material. The method includes determining, based on the first and second measurements, a first tensor and conveying the tool into a first wellbore formed in a subsurface formation. The method includes detecting, via the first receiver and the second receiver, a third and fourth measurement, respectively, of a second signal transmitted by the transmitter and determining, based on the third and fourth measurements, a second tensor and determining a third tensor (having values independent of the first, second, and third tilt angles) based on a relationship between the first and second tensors.

A tool string electrical transmission line connector comprising a cylinder adapted for mounting within a bore adjacent to a shoulder within the bore of a downhole tool. The cylinder comprising an inside axial side wall spaced apart from an outside axial side wall joining top and bottom surfaces. The connector further comprises an axial channel open to the outside axial side wall intersecting the bottom surface and a housing open to the outside axial side wall. The housing being open to the top surface. An electrical transmission line connector is disposed within the housing. An electrical transmission line is disposed within the axial channel and connected within the housing to an adjacent electrical transmission device. The axial channel further comprises one or more tab closures. The tab closures may comprise a clamp. When fitted into the bore, the tabs close around a cable residing within the channel.

A tool string electrical transmission line connector comprising a cylinder adapted for mounting within a bore adjacent to a shoulder within the bore of a downhole tool. The cylinder comprising an inside axial side wall spaced apart from an outside axial side wall joining top and bottom surfaces. The connector further comprises an axial channel open to the outside axial side wall intersecting the bottom surface and a housing open to the outside axial side wall. The housing being open to the top surface. An electrical transmission line connector is disposed within the housing. An electrical transmission line is disposed within the axial channel and connected within the housing to an adjacent electrical transmission device. The axial channel further comprises one or more tab closures. The tab closures may comprise a clamp. When fitted into the bore, the tabs close around a cable residing within the channel.

Aspects of the subject technology relate to systems and methods for optimizing telemetry schemes with a constant insensible group delay. Systems and methods are provided for receiving an acquisition including compressed data and dummy data from a downhole logging system, determining a prior decompressor queue size based on the acquisition for a plurality of time intervals, determining a decompressor data size based on the acquisition for the plurality of time intervals, and determining a delay where the prior decompressor queue size is continuously greater than or equal to the decompressor data size for the plurality of time intervals.

A unified mud-pulse (MP)-electromagnetic (EM) telemetry assembly and a downhole telemetry tool are provided including a downhole EM telemetry transmitter apparatus. The EM telemetry transmitter apparatus comprises a modulator configured to transmit at least one EM signal through transmission medium. The modulator comprises a first reactive circuit and a second reactive circuit, and a plurality of switches controlled by a controller to alternatingly switch the modulator between a first configuration and a second configuration. The EM signals are transmitted by passing one of the reactive circuits and bypassing the other reactive circuit.

A unified mud-pulse (MP)-electromagnetic (EM) telemetry assembly and a downhole telemetry tool are provided including a downhole EM telemetry transmitter apparatus. The EM telemetry transmitter apparatus comprises a modulator configured to transmit at least one EM signal through transmission medium. The modulator comprises a first reactive circuit and a second reactive circuit, and a plurality of switches controlled by a controller to alternatingly switch the modulator between a first configuration and a second configuration. The EM signals are transmitted by passing one of the reactive circuits and bypassing the other reactive circuit.

A system for monitoring conditions in a wellbore includes a sensor assembly and a controller assembly. The sensor assembly attaches to a portion of a casing disposed in the wellbore and includes a sensor module and an inductive module. The sensor module measures conditions in the wellbore and the inductive module forms a wireless communication channel. The inductive module includes a first set of inductive coils and a second set of inductive coils that substantially surround the first set of inductive coils. The controller assembly attaches to a portion of a production tube housed within the casing and includes at least one coil inductively coupled to the inductive module, and communicates signals over the wireless communication channel.

A system for monitoring conditions in a wellbore includes a sensor assembly and a controller assembly. The sensor assembly attaches to a portion of a casing disposed in the wellbore and includes a sensor module and an inductive module. The sensor module measures conditions in the wellbore and the inductive module forms a wireless communication channel. The inductive module includes a first set of inductive coils and a second set of inductive coils that substantially surround the first set of inductive coils. The controller assembly attaches to a portion of a production tube housed within the casing and includes at least one coil inductively coupled to the inductive module, and communicates signals over the wireless communication channel.

Embodiments of the present invention use radar technology to detect features or conditions in a well. A radar unit having an electronics subsystem and an antenna subsystem is positioned downhole in the well. The radar unit is coupled receive power from and communicate with to a surface system. The electronics subsystem generates RF signals which are provided to the antenna subsystem, generating radar wavefronts that are propagated toward areas of interest (e.g., farther downhole). The radar wavefronts may be electronically or mechanically steered in the desired direction. The antenna subsystem receives radar signals that are reflected back to the unit by features or conditions in the well. The received reflected signals are converted to electronic signals that are interpreted by the electronics subsystem of the radar unit or by the surface system to identify the features or conditions that caused the reflections.