Abstract: A dielectric tool, system, and method for determining properties of subterranean formations. A dielectric tool may comprise a tool body, a transmitter, a receiver, wherein the receiver is operable to measure formation dielectric response to the transmitter, and at least one of the transmitter or at least one of the receiver is operable to have a substantially radial magnetic dipole moment. A system may comprise a dielectric tool and an information handling system, wherein the information handling system is operable to determine properties of a subterranean formation based at least on the measured formation dielectric response.

Abstract: A telemetry system is operable to transmit data by bridging the low signal bandwidth available to high temperature electronics with the high spectral bandwidth available in optical fiber. A transmitter, such as a frequency comb, generates light to a fiber and the light is demultiplexed to separate the light into separate wavelengths. Modulators encode downhole data onto each wavelength and a multiplexer recombines the wavelengths onto a single fiber that passes the light back to the surface where a second demultiplexer separates the light to be transmitted to distinct receivers that detect the encoded data. A dual fiber system may also be utilized. One or more commands may also be transmitted to the downhole tools by transmitted the encoded command to a coupler that is coupled to a multiplexer where a downhole receiver determines the downhole tool that should receive the associated command.

Abstract: A drill bit includes a bit body having one or more blades extending therefrom and a plurality of cutters secured to the one or more blades. One or more rolling elements are positioned on the bit body, and each rolling element has a rotational axis and provides one or more cylindrical bearing portions rotatable about the rotational axis. Each rolling element is rotatably coupled to the bit body within a housing that defines one or more internal bearing surfaces that partially enclose the one or more cylindrical bearing portions but leaves a full length of the rolling element exposed.

Abstract: A displaced electrode amplifier (“DEA”) for measuring signals from high impedance sources. The amplifier may include an operational amplifier (“op-amp”) configured as a unity gain buffer, with a feedback path to the non-inverting input to at least partly compensate for a parasitic input shunt impedance. In cases where the device is to measure AC signals in high ambient temperatures, the non-inverting input may be coupled via a large resistance to a ground reference that is driven with a second feedback signal to magnify the effective value of the large resistance. Where a differential configuration is desired, one or more tuning resistors may be provided to match responses of different input buffer stages, thereby maximizing the common mode rejection. The disclosed amplifier is suitable for use in oil-based mud resistivity imaging tools but is also suitable for other applications.