Abstract: Methods including determining a measurement plan, having acoustic measurements, and lowering in a borehole penetrating a subsurface formation a toolstring having phased array modules. Each phased array module includes acoustic transducers operable to emit an acoustic excitation signal and receive an echo signal, as well as a programmable circuit for setting one or more variables of the phased array module. The phased array modules are configured, including programming the programmable circuit to set variables of the phased array modules according to the measurement plan. The acoustic measurements of the measurement plan are performed using the configured phased array modules. One or more of the formation, a casing disposed in the borehole, and/or an annulus between the casing and the formation are characterized using results of the performed acoustic measurements.

Abstract: A downhole tool having an acoustic transducer for downhole measurements. A backing is in contact with an inner surface of the transducer. A first structure is coupled to a first housing. A second structure is coupled to a second housing. A member includes first, second, and third portions. The first portion is coupled to the first structure. The second portion is coupled to the second structure. At least one of the first and second structures is coupled to the member and has a degree of freedom relative to the member. The third portion extends longitudinally through the backing between the first and second portions such that compressional forces on the first and second housings are transferred through the first and second structures and the backing. A canister contacts an outer surface of the transducer and exerts radial forces on the transducer when exposed to pressures higher than atmospheric pressure.

Abstract: A downhole tool having an acoustic transducer for downhole measurements. A backing is in contact with an inner surface of the transducer. A first structure is coupled to a first housing. A second structure is coupled to a second housing. A member includes first, second, and third portions. The first portion is coupled to the first structure. The second portion is coupled to the second structure. At least one of the first and second structures is coupled to the member and has a degree of freedom relative to the member. The third portion extends longitudinally through the backing between the first and second portions such that compressional forces on the first and second housings are transferred through the first and second structures and the backing. A canister contacts an outer surface of the transducer and exerts radial forces on the transducer when exposed to pressures higher than atmospheric pressure.

Abstract: A downhole tool having an acoustic transducer for downhole measurements. A backing is in contact with an inner surface of the transducer. A first structure is coupled to a first housing. A second structure is coupled to a second housing. A member includes first, second, and third portions. The first portion is coupled to the first structure. The second portion is coupled to the second structure. At least one of the first and second structures is coupled to the member and has a degree of freedom relative to the member. The third portion extends longitudinally through the backing between the first and second portions such that compressional forces on the first and second housings are transferred through the first and second structures and the backing. A canister contacts an outer surface of the transducer and exerts radial forces on the transducer when exposed to pressures higher than atmospheric pressure.

Abstract: Methods including determining a measurement plan, having acoustic measurements, and lowering in a borehole penetrating a subsurface formation a toolstring having phased array modules. Each phased array module includes acoustic transducers operable to emit an acoustic excitation signal and receive an echo signal, as well as a programmable circuit for setting one or more variables of the phased array module. The phased array modules are configured, including programming the programmable circuit to set variables of the phased array modules according to the measurement plan. The acoustic measurements of the measurement plan are performed using the configured phased array modules. One or more of the formation, a casing disposed in the borehole, and/or an annulus between the casing and the formation are characterized using results of the performed acoustic measurements.

Abstract: A technique facilitates the insertion and/or extraction of an electronics cartridge with respect to a corresponding cartridge housing which may be used in a downhole tool, such as a logging tool. An insertion tool comprises a frame to which the cartridge housing may be coupled to enable insertion of a corresponding electronics cartridge. The insertion tool comprises a cartridge adapter which may be selectively engaged with the electronics cartridge. Additionally, the insertion tool comprises a cable system which may be mounted on the frame and coupled with the cartridge adapter. When a cable of the cable system is pulled by, for example, a cable winch, the cartridge adapter is moved in a direction which forces the insertion of the electronics cartridge into the corresponding cartridge housing. In some embodiments, the cable may be rerouted in the cable system to enable extraction of the electronics cartridge from the cartridge housing.

Abstract: Embodiments of the present disclosure are directed toward a system and method to calibrate calipers of a downhole tool. Specifically, a calibration tool includes a substantially cylindrical calibration ring. The calibration tool also includes a finger coupled to the calibration ring. The finger is configured to engage with the downhole tool such that the calibration ring is mounted to the downhole tool and is coaxial with a tool axis of the downhole tool.

Abstract: A technique facilitates the insertion and/or extraction of an electronics cartridge with respect to a corresponding cartridge housing which may be used in a downhole tool, such as a logging tool. An insertion tool comprises a frame to which the cartridge housing may be coupled to enable insertion of a corresponding electronics cartridge. The insertion tool comprises a cartridge adapter which may be selectively engaged with the electronics cartridge. Additionally, the insertion tool comprises a cable system which may be mounted on the frame and coupled with the cartridge adapter. When a cable of the cable system is pulled by, for example, a cable winch, the cartridge adapter is moved in a direction which forces the insertion of the electronics cartridge into the corresponding cartridge housing. In some embodiments, the cable may be rerouted in the cable system to enable extraction of the electronics cartridge from the cartridge housing.

Abstract: A magnetic core having an inner core and one or more bundles of stacked magnetic strips arranged over the length of the inner core generates an increased magnetic field with limited saturation. The magnetic strips may include silicon-iron, iron cobalt, or combinations thereof. A method of manufacturing the core includes providing a plurality of magnetic strips each having a length longer than a width, coupling the plurality of magnetic strips along one length of each of the plurality of magnetic strips, and shaping the plurality of magnetic strips partially or fully around an inner circumference.

Abstract: Embodiments of the present disclosure are directed toward a system and method to calibrate calipers of a downhole tool. Specifically, a calibration tool includes a substantially cylindrical calibration ring. The calibration tool also includes a finger coupled to the calibration ring. The finger is configured to engage with the downhole tool such that the calibration ring is mounted to the downhole tool and is coaxial with a tool axis of the downhole tool.