Patent application number | Description | Published |
20080271888 | Methods of Using Viscoelastic Surfactant Gelled Fluids to Pre-Saturate Underground Formations - Viscoelastic surfactant (VES) based fluid systems are effective to pre-saturate high permeability subterranean formations prior to a treatment operation that would undesirably suffer from high fluid leakoff. The fluid systems may include brine, a viscosity enhancer, as well as the VES, and a high temperature stabilizer. The stabilizer may be an alkaline earth metal oxide, alkaline earth metal hydroxide, alkali metal oxide, alkali metal hydroxide, Al | 11-06-2008 |
20090065209 | Multifunctional Nanoparticles for Downhole Formation Treatments - An aqueous, viscoelastic fluid gelled with a viscoelastic surfactant (VES) is stabilized and improved with an effective amount of an alkaline earth metal oxide alkaline earth metal hydroxide, alkali metal oxides, alkali metal hydroxides transition metal oxides, transition metal hydroxides, post-transition metal oxides, and post-transition metal hydroxides. These fluids are more stable and have a reduced or no tendency to precipitate, particularly at elevated temperatures, and may also help control fluid loss. When the particle size of the magnesium oxide or other particulate agent is a nanometer scale, for instance having a mean particle size of 100 nm or less, that scale may provide unique particle charges that use chemisorption, “crosslinking” and/or other chemistries to associate and stabilize the VES fluids, and also help trap or fixate formation fines when deposited into a proppant pack in a fracture. | 03-12-2009 |
20090266765 | Methods for Recharging Nanoparticle-Treated Beds - Nanoparticle-treated particle packs, such as sand beds, may effectively filter and purify liquids such as waste water. Proppant beds treated with nanoparticles may fixate or reduce fines migration therethrough. When tiny contaminant particles or fines in these fluids flow through the nanoparticle-treated bed or pack, the nanoparticles will capture and hold the tiny contaminant or fines particles within the pack due to the nanoparticles' surface forces, including, but not necessarily limited to van der Waals and electrostatic forces. Nanoparticle-treated beds or packs may be recharged by contacting the bed with an inorganic acid (but not hydrofluoric acid) or an organic acid, and optionally followed by subsequent treatment with hydrofluoric acid. This treating substantially removes the nanoparticles and the fine particulates that have been removed from a fluid (e.g. wastewater being treated, produced fluids in a formation, etc.). The particle pack may then be re-treated or recharged with nanoparticles. | 10-29-2009 |
20090272534 | METHODS OF USING VISCOELEASTIC SURFACTANT GELLED FLUIDS TO PRE-SATURATE UNDERGROUND FORMATIONS - Viscoelastic surfactant (VES) based fluid systems are effective to pre-saturate high permeability subterranean formations prior to a treatment operation that would undesirably suffer from high fluid leakoff. The fluid systems may include brine, a viscosity enhancer, as well as the VES, and a high temperature stabilizer. The stabilizer may be an alkaline earth metal oxide, alkaline earth metal hydroxide, alkali metal oxide, alkali metal hydroxide, Al | 11-05-2009 |
20100263866 | Multifunctional Particles for Downhole Formation Treatments - An aqueous, viscoelastic fluid gelled with a viscosifier, e.g. a viscoelastic surfactant, is stabilized and improved with an effective amount of a particulate additive such as alkaline earth metal oxides, alkaline earth metal hydroxides, transition metal oxides, transition metal hydroxides, post-transition metal oxides, and post-transition metal hydroxides. These fluids are more stable and have a reduced or no tendency to precipitate, particularly at elevated temperatures, and may also help control fluid loss. These particulate additives have unique particle charges that use chemisorption, “crosslinking” and/or other chemistries to associate and stabilize the VES fluids, and also help trap or fixate formation fines when placed in a gravel pack or a proppant pack in a fracture. Some of these effects may be more pronounced the smaller the size of the particulate additive. | 10-21-2010 |
Patent application number | Description | Published |
20090245440 | OUTPUT CIRCUITRY FOR MINIMIZING SPURIOUS FREQUENCY CONTENT - A system including first voltage supply circuitry configured to provide a first voltage supply with spurious frequency content and second voltage supply circuitry configured to provide a second voltage supply without the spurious frequency content is provided. The system includes signal generation circuitry configured to generate a first digital signal using a clock signal and the first voltage supply and configured to cause the spurious frequency content on the first voltage supply and output circuitry configured to generate a second digital signal from the first digital signal synchronous with the clock signal using the second voltage supply. | 10-01-2009 |
20100009645 | Controlling Fine Frequency Changes In An Oscillator - In one embodiment, the present invention includes a method for determining if a frequency control instruction would cause a first capacitor bank to reach a limit and adjusting the first capacitor bank in a first direction using a calibration value and adjusting a second capacitor bank in a second direction if the first capacitor bank would reach the limit. Furthermore, the calibration value may be calculated and stored in accordance with other embodiments. In such manner, small changes in capacitance and correspondingly small changes in frequency may be effected. | 01-14-2010 |
20120183102 | Receiver Circuits and Systems for Receiving Medium Wave and Short Wave Signals - A receiver includes a first terminal for receiving an RF signal having a frequency of less than approximately 60 MHz, a second terminal, and a receive path having an input coupled to the first terminal and an output for providing a demodulated RF signal. The receiver further includes a detector coupled to the receive path for detecting a signal parameter in the RF signal and a controller coupled to the detector and to the second terminal. The controller provides the multiplex signal in a tuning state to the second terminal to selectively provide one of a first RF signal and a second RF signal to the first terminal and to determine at least one of a first parameter of the first RF signal and a second parameter of the second RF signal. The controller provides the multiplex signal in an operating state based on the first parameter and the second parameter. | 07-19-2012 |
20140184116 | APPARATUS FOR MOTOR CONTROL SYSTEM AND ASSOCIATED METHODS - A motor control apparatus to control a motor external to the motor control apparatus includes a microcontroller unit (MCU). The MCU includes mixed signal motor control circuitry adapted to perform back electromotive force (EMF) motor control in a first mode of operation. The mixed signal motor control circuitry is further adapted to perform field oriented control (FOC) in a second mode of operation. | 07-03-2014 |
Patent application number | Description | Published |
20090117869 | Digital tunning error correction for intergrated receivers and associated methods - A digital tuning error correction system for an integrated receiver and associated method are disclosed that provide an advantageous solution for combining digital signal processing (DSP) circuitry on the same integrated circuit as mixer and local oscillator (LO) generation circuitry. | 05-07-2009 |
20110159828 | Configurable Radio Front End - In one embodiment, the present invention includes a single chip radio tuner, which may be adapted within an integrated circuit (IC). The tuner may be provided with a configurable front end to receive and process a radio frequency (RF) signal via a signal path. This configurable front end may be differently controlled depending on a particular radio implementation in which the tuner is adapted. | 06-30-2011 |
20110159829 | Integrating Components In A Radio Tuner Integrated Circuit (IC) For A Tracking Filter - In one embodiment, the present invention includes a method for configuring a single chip radio tuner having a configurable front end, which may be adapted within an integrated circuit (IC). The method may include setting a controller of the tuner with configuration information for a radio in which the tuner is located. Then, control signals responsive to the configuration information can be sent to the configurable front end to configure the tuner. | 06-30-2011 |
20130244600 | Integrating Components In A Radio Tuner Integrated Circuit (IC) For A Tracking Filter - In one embodiment, the present invention includes a method for configuring a single chip radio tuner having a configurable front end, which may be adapted within an integrated circuit (IC). The method may include setting a controller of the tuner with configuration information for a radio in which the tuner is located. Then, control signals responsive to the configuration information can be sent to the configurable front end to configure the tuner. | 09-19-2013 |
20130303102 | DIFFERENTIAL LOOPSTICK ANTENNA CONFIGURATION - A long-wave or medium-wave receiver receives a first signal from a first terminal of a loopstick antenna on a positive antenna input terminal of the receiver and receives a second signal from a second terminal of the loopstick antenna on a negative antenna input terminal of the receiver. The first and second signals are processed differentially in the receiver. The receiver may optionally be configured to operate in either a differential mode or a single-ended mode by setting switches to selectively connect one of the antenna input terminals to ground in single-ended mode. | 11-14-2013 |