Abstract:
Embodiments disclosed herein relate to gels for use in downhole applications containing the reaction product of at least one polymer, or polymer precursor, and at least one oxazoline crosslinking agent, wherein the at least one polymer, or polymer precursor, and the oxazoline crosslinking agent are normally combined in a solution, and methods including the use thereof. Also disclosed is a method to activate the gel formation under acidic conditions thus improving gel control; oxazoline, aziridine and carbodiimide crosslinking agents
Abstract:
A power toothbrush (10) is disclosed having a handle (15), battery (12), ultrasonic drive circuit (14), motor (16), control unit (18), and toothbrush head (20). The toothbrush head includes bristles (26) and a waveguide (24) that is operatively connected to an ultrasonic transducer (22). The waveguide facilitates the transmission of acoustic energy into the dental fluid to achieve improved cleaning and stain removal and improved cleaning in interproximal and subgingival regions. In one embodiment an ultrasound transducer module (30) includes a plurality of piezoelectric elements (32, 34) that may be mechanically connected in series, and electrically connected in parallel. One or more contacts (36) connect the elements, and a waveguide structure (50). An impedance matching layer (38) may be provided between the waveguide and the ultrasonic transducer module. The waveguide may be formed from an relatively soft material, for example, a polymer having a hardness between 10 and 65 Shore A.
Abstract:
A wellbore fluid having at least two phases, including a fluid phase and a solid phase. The solid phase is a powdered solid material coated with a polymer that is the reaction product of a polyether amine and a dialdehyde crosslinking agent. Preferably the polyether amine is a diamine and more preferably the compound acts as a shale hydration inhibitor. The dialdehyde crosslinking agent reacts with the polyether amine compound and forms the polymeric material coating the solid. The polymer is substantially solubilized when the pH of the fluid has a value of less than about 7.
Abstract:
An oral hygiene device having an ultrasound transducer 22 and an acoustic waveguide 24 facilitating the transmission of ultrasonic acoustic energy to fluids in the oral cavity is disclosed. Preferred ultrasound operating parameters for operation in aqueous environments and in dental slurries are disclosed. Devices may incorporate a drive motor 16 for oscillating a device head 23, acoustic waveguide 24 and one or more bristle tuft(s) 26 at sonic frequencies, and preferred sonic operating parameters are also provided. Multi-element piezoelectric transducer assemblies 30, 40, and various control and communications features are disclosed. Oral hygiene devices disclosed herein achieve improved plaque and stain removal from the teeth as well as interproximal and subgingival regions, while enhancing the user experience, massaging the gums, stimulating dental tissue, and disrupting biofilm.
Abstract:
A method of increasing the thermal stability of an aqueous wellbore fluid that includes a viscosifying agent, involves formulating the wellbore fluid so as to include an effective amount of a thermal stability compound selected from the group of gallic acid, gallow tannins, esters of gallic acid, salts of gallic acid and combinations of these compounds. The inclusion of the thermal stability agent surprisingly enhances the ability of the wellbore fluid to maintain viscosity and fluid loss properties upon exposure to high temperatures. Preferably the thermal stability agent is gallic acid or substantially pure 3,4,5-trihydroxybenzoic acid. The concentration of the thermal stability compound is from about 0.1% by weight to about 10% by weight of the wellbore fluid. The wellbore fluid is formulated to include a viscosifying agent such as starch, schleroglucans, guar gums, polyacrylates, xanthan gum, and combinations of these and similar compounds. Optionally, the wellbore fluid is formulated to include a weighting agent such as barite, hematite, iron oxide, calcium carbonate, alkali halides, alkaline earth halides, magnesium carbonate, zinc halides, zinc formats, zinc acetates, cesium halides, cesium formats, cesium acetates, and combinations of these and similar compounds.
Abstract:
Disclosed are methods and related compositions for altering the physical and chemical properties of a substrate used in hydrocarbon exploitation, such as in downhole drilling operations. In a preferred embodiment a method involves formulating a fluid, tailored to the specific drilling conditions, that contains one or more inactivated enzymes. Preferably the enzyme is inactivated by encapsulation in a pH responsive material. After the fluid has been introduced into the well bore, one or more triggering signals, such as a change in pH, is applied to the fluid that will activate or reactivate the inactivated enzyme, preferably by causing it to be released by the encapsulation material. The reactivated enzyme is capable of selectively acting upon a substrate located downhole to bring about the desired change in the chemical or physical properties of the substrate.
Abstract:
The present invention is related a device for polypropylene bands that makes the crimping process easier. It provides a manual crimping device. The device saves the user time and increases productivity. It is small in size, making it portable and user friendly. It has a pair of handle for handling it properly. The handles are fully covered with a rubber grip, which provides comfort to the users while gripping the device. It also has a spring in the handle for easy operation of the device. It also has a space for advertisement, where companies can print their logo. It is made of strong but lightweight material. The device is economical to manufacture and easy to implement.
Abstract:
A method of controlling the loss of a drilling fluid from a well bore into a subterranean formation in which one illustrative embodiment includes: drilling the well bore with an aqueous based drilling fluid that includes an aqueous phase and a shale hydration inhibitor that is a polyether amine compound, and circulating into the well bore a fluid pill including a dialdehyde crosslinking agent. The dialdehyde crosslinking agent reacts with the polyether amine compound and forms a polymeric material.
Abstract:
A method of increasing the thermal stability of an aqueous wellbore fluid that includes a viscosifying agent, involves formulating the wellbore fluid so as to include an effective amount of a thermal stability compound selected from the group of gallic acid, gallow tannins, esters of gallic acid, salts of gallic acid and combinations of these compounds. The inclusion of the thermal stability agent surprisingly enhances the ability of the wellbore fluid to maintain viscosity and fluid loss properties upon exposure to high temperatures. Preferably the thermal stability agent is gallic acid or substantially pure 3,4,5-trihydroxybenzoic acid. The concentration of the thermal stability compound is from about 0.1% by weight to about 10% by weight of the wellbore fluid. The wellbore fluid is formulated to include a viscosifying agent such as starch, schleroglucans, guar gums, polyacrylates, xanthan gum, and combinations of these and similar compounds. Optionally, the wellbore fluid is formulated to include a weighting agent such as barite, hematite, iron oxide, calcium carbonate, alkali halides, alkaline earth halides, magnesium carbonate, zinc halides, zinc formats, zinc acetates, cesium halides, cesium formats, cesium acetates, and combinations of these and similar compounds.
Abstract:
A vehicle for transferring multiple payloads from the trajectory of an earth-launch vehicle to another trajectory. The vehicle includes an engine module, to which one payload is directly attached. A carrier member extends forwardly, enclosing the first payload, which is detachably secured directly to the support frame and adapted to carry the second payload in tandem with and forward of the first payload. Cantilever and linear loads are transmitted directly by the second payload to the support frame of the engine module. The second payload, the carrier member and then the first payload are sequentially separated from the engine module after achieving another, e.g., geostationary, orbit. The vehicle may have dual-mode capability in which it can carry a single, relatively larger (heavier) payload or two, relatively smaller (lighter) payloads. In this configuration the engine module carries rocket engine and fuel supply elements which are sized to accomplish payload transfer in either mode and the operational carrier member which is employed in the dual transfer is configured such that, along with second payload, there is no substantial change in the center of gravity of the vehicle whether used in either mode.