Ounadjela
Abderrhamane Ounadjela, Belmont, MA US
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20100228530 | PROCESSING TIME SERIES DATA EMBEDDED IN HIGH NOISE - Automatic detection and accurate time picking of weak events embedded in strong noise such as microseismicity induced by hydraulic fracturing is accomplished by: a noise reduction step to separate out the noise and estimate its spectrum; an events detection and confidence indicator step, in which a new statistical test is applied to detect which time windows contain coherent arrivals across components and sensors in the multicomponent array and to indicate the confidence in this detection; and a time-picking step to accurately estimate the time of onset of the arrivals detected above and measure the time delay across the array using a hybrid beamforming method incorporating the use of higher order statistics. In the context of hydraulic fracturing, this could enhance the coverage and mapping of the fractures while also enabling monitoring from the treatment well itself where there is usually much higher and spatially correlated noise. | 09-09-2010 |
Abderrhamane Ounadjela, Somerville, MA US
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20100202252 | MULTI-MODE DOWNHOLE ACOUSTIC SOURCE - A multimode acoustic source device for disposition in a borehole formed in a subterranean formation is aligned along an axial axis of the borehole and has a plurality of radiating plates circumferentially disposed about the axial axis. A drive mechanism is proposed to independently and reversibly move each radiating plate from a first position to a second position in a direction transverse to the axial axis. This enables the multimode source to generate each of several azimuthal modes for logging a subterranean formation. | 08-12-2010 |
Abderrhamane Ounadjela, Paris FR
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20120307596 | SYSTEMS, METHODS, AND APPARATUS TO DRIVE REACTIVE LOADS - Systems, methods, and apparatus to drive reactive loads are disclosed. An example apparatus to drive a reactive load includes a reactive component in circuit with the reactive load, a first switching element in circuit with the reactive load to selectively hold the reactive load in a first energy state and to selectively allow the reactive load to change from the first energy state to a second energy state, a second switching element in circuit with the reactive load to selectively hold the reactive load in the second energy state and to selectively allow the reactive load to change from the second energy state to the first energy state, and a controller to detect a current in the reactive load, and to control the first and second switching elements to hold the reactive load in the first or the second energy state when the current traverses a threshold. | 12-06-2012 |
20130255367 | APPARATUS, METHOD AND SYSTEM FOR MEASURING FORMATION PRESSURE AND MOBILITY - An apparatus, method and system are provided for characterizing fluid trapped in a subterranean formation using a downhole tool that includes an elongated body and a probe body. The probe body is moveable from and back into the elongated body. The probe body defines a flow line and supports a pressure sensor for measuring fluid pressure in the flow line, a piston and an electrical motor actuator that is adapted to move the piston in order to vary volume of the flow line. The integral electrical motor actuator, piston, pressure sensor and flow line of the probe body can provide for measurement of formation pressure and/or formation mobility. | 10-03-2013 |
20140125384 | Systems, Methods, and Apparatus to Drive Reactive Loads - Systems, methods, and apparatus to drive reactive loads are disclosed. An example apparatus to drive a reactive load includes a reactive component in circuit with the reactive load, a first switching element in circuit with the reactive load to selectively hold the reactive load in a first energy state and to selectively allow the reactive load to change from the first energy state to a second energy state, a second switching element in circuit with the reactive load to selectively hold the reactive load in the second energy state and to selectively allow the reactive load to change from the second energy state to the first energy state, and a controller to detect a current in the reactive load, and to control the first and second switching elements to hold the reactive load in the first or the second energy state when the current traverses a threshold. | 05-08-2014 |
Abderrhamane Ounadjela, Yokohama-Shi JP
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20160123130 | Borehole Tool - A borehole tool used in a borehole comprises a tool body, a plurality of arms connected to the tool body so as to be movable radially relative thereto between a closed position and an open position, and a plurality of pads with a totally rounded outer shape. Each of the pads is mounted on each movable portion of the arms so as to be rotatable about a radial axis relative to the tool body according to the arm movement between the closed position and the open position. | 05-05-2016 |
Kamel Ounadjela, Belamont, CA US
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20130171052 | Process for Removing Nonmetallic Impurities from Metallurgical Silicon - The invention describes a process for removing nonmetallic impurities from metallurgical silicon. A melt is produced from metallurgical silicon and halide-containing silicon. As a result, the impurities are sublimed out and removed from the melt in the form of nonmetal halides. Compared with the known process, in which gaseous halogen is blown through an Si melt, the novel process can be carried out in a particularly simple and efficient manner. | 07-04-2013 |