SONDEX LIMITED Patent applications |
Patent application number | Title | Published |
20130088361 | SENSOR COMMUATED ELECTRIC MOTOR WITH SENSORLESS ANGULAR POSITION DETERMINATION AND METHOD - An electric motor assembly, mud pulser and a method for transmitting data. The electric motor assembly includes an electric motor having a rotor and a stator that includes one or more windings; one or more sensors on the stator and configured to determine an angular position of the rotor; and a motor control circuitry configured to control a commutation of the electric motor based on signals received from the one or more sensors. The motor control circuitry is configured to determine a total angular rotation of the rotor based on a back emf voltage of the one or more windings and independent of the signals from the one or more sensors. | 04-11-2013 |
20120299596 | Method and Apparatus for Measuring Borehole Mud Resistivity - Apparatuses, methods for manufacturing an apparatus and methods for measuring a fluid resistivity are provided. An apparatus for measuring a fluid resistivity includes a fluid column defining structure, two current injecting electrodes, voltage measurement electrodes, and two additional electrodes. The fluid column defining structure is configured to allow a fluid, whose resistivity is to be measured, to fill a fluid column inside the fluid column defining structure. The two current injecting electrodes are configured to inject a known current into the fluid column. The voltage measurement electrodes are configured to measure a voltage across a measurement column included in the fluid column. The two additional electrodes disposed inside the fluid column defining structure, outside of the positions of the two current injecting electrodes in the longitudinal direction are electrically connected to each other. | 11-29-2012 |
20120163131 | Mono-directional Ultrasound Transducer for Borehole Imaging - Devices and methods to generate a mono-directional ultrasonic wave are provided. An ultrasonic sensor configured to emit a substantially mono-directional ultrasonic wave includes a first piezoelectric element and a second piezoelectric element. The first piezoelectric element is configured to generate a first ultrasonic wave propagating in a first direction and a second ultrasonic wave propagating in a second direction which is different from the first direction. The second piezoelectric element is located and configured to absorb the second ultrasonic wave, and is configured to convert an energy of the absorbed second ultrasonic wave into an electrical energy. | 06-28-2012 |
20120160572 | Vibration-Resistant Seal for Downhole Tool - A seal ring assembly for a well drilling tool that takes the place of conventional O-rings that are prone to costly downhole failures. In a first embodiment the seal ring assembly is configured with a convex adapter seal ring at one end, a concave adapter seal ring at the other end, and a number of V-shaped component seal rings packed in between the convex and concave adapter seal rings and positioned in the space between a drill collar mandrel and a pressure cylinder of the well drilling tool. In a second embodiment the seal ring assembly is configured with a number of X-shaped component seal rings, each of which is fitted with two O-rings. The seal ring assemblies are able to flex when operating in a bent drill hole so as to maintain seal integrity and prevent fluids from passing through to the electronics region of the well drilling tool. | 06-28-2012 |
20120158308 | Canted Helix Collapsible Flowmeter and Method of Measuring A Fluid Flow - Flowmeters and methods of measuring a fluid flow or manufacturing flowmeters are presented. A flowmeter has a tool body and one or more spinner arms configured to extend with a first end away from the tool body and a second end joined to the tool body, when deployed to measure a fluid flow. Each spinner arm includes a helical blade configured to rotate due to a fluid flowing substantially parallel to a longitudinal axis of the tool body, around a rotation axis between the first end and the second end. | 06-21-2012 |
20120152027 | Sensitive Differential Pressure Sensor and Method - A differential pressure sensor has a magnetized piston free to move in a cylinder. Magnetic endcaps seal the ends of the cylinder, forming chambers on either side of the piston. The moveable magnetic piston is constrained by the opposing magnetic fields of the endcaps. The piston is covered with magnetic ferrofluid, providing a low friction gas-tight seal around the piston. The cylinder has two pressure input lines, one being connected to the chamber on either side of the piston. The relative pressures of the input lines cause the piston to move to a position of equilibrium within the cylinder, with the magnetic fields of the endcaps holding the piston in place against the pressure. A magnetic field angle sensor detects flux lines on the outside of the cylinder, and the reading is correlated with the pressure differential between the two input lines. | 06-21-2012 |
20120132819 | Neutron Porosity Logging Tool Using Microstructured Neutron Detectors - A neutron porosity measurement device uses semiconductor detectors located at different distances from a cavity configured to accommodate a neutron source. Each of the semiconductor detectors includes (i) a semiconductor substrate doped to form a pn junction, and having microstructures of neutron reactive material formed to extend from a first surface inside the semiconductor substrate, and (ii) electrodes, one of which is in contact with the first surface of the semiconductor substrate and another one of which is in contact with a second surface of the semiconductor substrate, the second surface being opposite to the first surface. The electrodes are configured to acquire an electrical signal occurring when a neutron is captured inside the semiconductor substrate. | 05-31-2012 |
20120108171 | Telemetry Conveyed by Pipe Utilizing Specks - Drill pipe segments, communication systems, and methods of manufacturing pipe segments usable for communicating data wirelessly between sensors and tools placed in an oil and/or gas well are provided. Communication specks are applied on at least one of an outer surface or an inner surface of the pipe segments or coil tubing. | 05-03-2012 |
20120069328 | REFRACTIVE INDEX TOOL AND METHOD - Refractive index tools and method. A refractive index tool includes a wave source configured to generate a wave; a transparent rod configured to receive the wave from the wave source; and a wave detector configured to receive the wave from the transparent rod. The wave source is provided at a first end of the transparent rod and the wave detector is provided at the first end or a second end of the transparent rod so that the wave emitted by the wave source travels through the transparent rod and experiences total internal refraction prior to arriving at the wave detector. | 03-22-2012 |