Abstract: Hydrocarbon stimulation fluids are often used to increase the permeability and productivity of oil and gas reservoirs. The fluid itself is made up of a mixture of hydrocarbons and various chemicals designed to induce gel formation and gel breaking. The successful removal of these chemicals from the fluid has been achieved, through a process of acid-washing, mixing with a settling agent, centrifugation and filtration. This will allow the fluid to be re-used many times for further fracturing processes.

Abstract: In one embodiment, the present invention provides a method comprising providing a treatment fluid that comprises a base fluid and a silicone-tackifier matrix composition that comprises at least one silicone polymer component, at least one tackifying agent, and at least one curing agent and/or at least one cross linking agent; placing the treatment fluid in a subterranean formation; and allowing the silicone-tackifier matrix to form at least one silicone-tackifier matrix therein.

Abstract: An apparatus is provided for use as a downhole tool or a component thereof for insertion into a wellbore. According to one aspect, the apparatus has a body having a chamber, wherein at least a portion of the body is radially expandable; and a water-swellable material in the chamber, wherein the water-swellable material is dissolvable in water. According to another aspect, the apparatus has a body having a chamber, wherein at least a portion of the body is radially expandable, and wherein at least a portion of the body is made with a material that is deteriorable by hydrolysis; and a water-swellable material in the chamber. According to a further aspect, the water-swellable material is dissolvable in water.

Abstract: A downhole perforator assembly (10) for establishing communication between the interior of a tubular string (18) and a surrounding annulus (24) includes a downhole power unit (100) having a power unit housing (150) and a moveable shaft (130) and a downhole perforator (260) having a perforator housing (262), a mandrel (278) slidably positioned within the perforator housing (262) and a penetrator (288) radially outwardly extendable from the perforator housing (262). The power unit housing (150) is operably associated with the perforator housing (262) and the moveable shaft (130) operably associated with the mandrel (278) such that when the downhole power unit (100) is activated and the moveable shaft (130) is longitudinally shifted relative to the power unit housing (150), the mandrel (278) is longitudinally shifted relative to the perforator housing (262) and at least a portion of the penetrator (288) is extended radially outwardly from the perforator housing (262).

Abstract: Some methods are provided that comprise: providing a treatment fluid comprising an aqueous fluid, and a stimuli-degradable gel formed by a reaction comprising a gelling agent, and a stimuli-degradable cross linking agent that includes at least one degradable group and two unsaturated terminal groups; placing the treatment fluid into a subterranean formation; and allowing the stimuli-degradable gel to degrade.

Abstract: A method of pumping an oilfield fluid from a well surface to a wellbore is provided that includes providing a clean stream; operating one or more clean pumps to pump the clean stream from the well surface to the wellbore; providing a dirty stream including a solid material disposed in a fluid carrier; and operating one or more dirty pumps to pump the dirty stream from the well surface to the wellbore, wherein the clean stream and the dirty stream together form said oilfield fluid.

Abstract: In accordance with certain embodiments, the present invention provides a connector for attaching to a multi-toothed profile on a wellhead features a tooth profile that staggers loading preferably starting at a loading surface furthest from the connector body sitting on the wellhead and moving toward the connector body. The staggered loading more evenly distributes stresses on the matching loading surfaces as compared to the result of using a tooth profile on the connector that nearly exactly matches the profile on the wellhead. The joint can then take advantage of an increased preload and exhibit improved stress characteristics when operating at high loading conditions.

Abstract: A fluid flow control device having at least one bypass valve that is actuated in response to the movement of an annular body housed in the device. The annular body may be housed in a cylindrical housing and be a buoyant or non-buoyant body, such as a non-buoyant annular ring. The movement of the annular body in the cylindrical housing actuates the one or more bypass valves. Flow through the bypass valves returns the fluid to its source, for example, to an aquifer while maintaining a desired liquid level. The fluid flow control device can provide an effective means for regulating the elevation of subsurface fluids, for example, ground water, to enhance the efficiency of gas extraction from subsurface strata, for example, the extraction of methane from water and methane containing coal beds. Systems and methods of extracting gases from subsurface strata are also provided.

Abstract: A sod cutting arrangement is mounted on a motorized implement, such as a walk-behind compact utility loader. The sod cutting arrangement incorporates a vibrating cutting head that may be driven by a hydraulic motor. A motion limiting arrangement may limit travel of the vibrating cutting head in both forward and reverse directions.

Abstract: In a swing control device installed in an electric rotary excavator (a construction machine), when a leading edge or a trailing edge of a lever signal is sharp due to a quick operation of a swing lever, a gradient as a rise time Ta1 or a fall time Tb1 is provided to the leading edge or the trailing edge of the torque output and the acceleration that are output based on the lever signal so as to somewhat ease the edge. With the arrangement, an impact in acceleration or deceleration of a rotary body can be suppressed. Specifically, a gradient in the acceleration operation is provided such that the rise time Ta1 becomes 0.15 seconds or more, while a gradient in the stop deceleration operation is provided such that the fall time Tb1 becomes 0.1 seconds or more.

Abstract: An electrical combination. The electrical combination includes a power tool having a housing supporting a motor, the motor being operable to drive a tool element and including a hand grip, a battery, and a locking assembly supported by one of the battery and the housing of the power tool for selectively securing the battery to the housing. The locking assembly includes a movable locking member and an actuator movable relative to one of the battery and the housing to move the locking member. The actuator moves along both a first path and a second path different from the first path between a locking position, in which the locking member secures the battery to the housing, and an unlocked position, in which the battery is removable from the power tool.

Abstract: The invention relates to a coupling device for drill rods comprising a receiving socket for receiving a connecting portion of the drill rod. Provision is made for at least one locking device with a locking element, which is supported in an adjustable manner between a release position and a locking position, in which the locking element engages into a corresponding recess of the connecting portion.

Abstract: An arrangement for installing building elements, such as piles and tunnel sections, into a ground formation, which arrangement comprises such a building element is provided. Two or more impact drivers for delivering blows to the element are mounted on or operatively connected to the element. Accordingly, large elements, such as monopiles for wind turbines, which may comprise a steel tube having a diameter in excess of 5 meters, or even tunnel sections, can be installed by means of a number of relatively small impact drivers.

Abstract: A tool that includes a housing, a motor assembly, a hook structure and a detent. The motor assembly has an output member and is at least partially housed in the housing. The detent has a first portion, which is engaged to the housing, and a second portion that is engaged to the hook structure. The first and second portions cooperate in an engaged condition to hold the hook structure in a selected rotational position relative to the housing. The first and second portions being disengagable to permit rotational movement of the hook structure relative to the housing. The hook structure can include a friction enhancing portion that is employed to provide better gripping performance.

Abstract: Percussion device including a machine housing (1),? a forwards and backwards movable percussion piston (2) in the machine housing, and a reciprocatingly movable valve body (6) in the machine housing, said percussion piston (2) being arranged to, subject a tool (3)? to impacts, and said percussion piston including a first (4) and a second (5) driving surface intended to be subjected to pressure in order to drive the percussion piston (2), forwards and backwards, said valve body ** (6) including a first end surface (12) and a second end surface (13), wherein the pressurizing of the first end surface (12) tends to drive the valve body in a first direction and pressurizing of the second end surface (13), tends to drive the valve body in a second direction, whereby the valve body (6) is arranged, over a channel (7) arranged in the machine housing, to connect at least the second (5) of the driving surfaces alternately to a pressure source (8) or to low pressure (9), wherein the second end surface (13), by the percu

Abstract: A percussion hand-held power tool includes a housing (4), a chuck (2) provided at one end of the housing (4), a handle (3) provided at an opposite end of the housing (4) and secured thereto, an axially displaceable percussion mechanism (5) located in the housing and connected thereto, at its handle side, by a spring (6) and a transversely extending articulated arm (7), and supported in the housing (4), at its chuck side, by axial slide surface element (8).

Abstract: A waterproof cover for an audio system includes a frame and a shield pivotally connected to the frame. The flame has two elongated recesses respectively defined in two opposed sides defining the through hole and an inclined trough sandwiched by the two elongated recesses and defined in a bottom side defining the through hole. The shield has two rails formed on two opposed sides thereof to correspond to and be movably received in the two elongated recesses, a water blocking flange sandwiched by the two rails and formed on a bottom side of the shield to correspond to and be received in the inclined trough and a flange formed on a top side of the shield to abut a top side defining the through hole such that a full coverage of the through hole by the shield is completed and water seeping from engagement between the shield and the frame is reduced.

Abstract: A conductor for windings cooled by liquid, especially for transformer windings, has an insulating covering which surrounds the entire conductor (1). At least one layer (2) of the covering completely surrounds the conductor (1). An external layer (3) provided with at least two layers (2, 3) of the covering comprises openings (4), holes (5) or frays (6) through which a coolant flowing around the conductor is placed in a turbulent state and better heat exchange is obtained.

Abstract: A double wire cord is used in an electro-acoustic converter, such as earphones and headphones, and has a long first cord and a long second cord. For example, the first cord is substantially circular in cross section and has a large diameter, the second cord is also substantially circular in cross section and has a small diameter, and the second cord can be removably housed in the first cord. The second cord is fitted into the fitting groove of the first code and thus housed in the first cord by pressing the side surface of the second cord against the fitting groove of the first cord, so that one wire cord can be easily provided. Therefore, it is convenient at the time of use and storage.

Abstract: Communication wires are provided with insulated corrugated conductors. The corrugated conductors have ridges and depressions, such that air gaps are provided between insulation and the outer surfaces of the wires in the regions of the depressions. In some embodiments, the ridges and depressions form a sine wave profile in cross-section. The insulation may be provided with corrugations, and the corrugations of the insulation may align with the corrugations of the conductors. Several wires may be combined into a communication cable.

Abstract: Layout methods for a substrate are disclosed. In one embodiment, the method includes: defining a first plating line on a non-conducting layer coupled to a first pad; and defining a second plating line on the first conducting layer coupled to a second pad. Along a direction away from the first pad and the second pad, a distance between the first plating line and the second plating line becomes longer. In another embodiment, the method includes: defining a plating line on a non-conducting layer, the plating line being coupled to a pad; and replacing a portion of at least a conducting layer with a non-conducting material, wherein the portion is directly under the plating line.

Abstract: According to one embodiment, a printed wiring board includes a first layer, a flexible sheet member disposed at a part on a surface of the first layer, and a second layer which is disposed on the first layer and the flexible sheet member, a part of the second layer which corresponds to the flexible sheet member including an opening region.

Abstract: A circuit board includes a metal core having a plate shape, an insulation section covering a surface of the metal core, and a heat radiation section in which the metal core is exposed and which is provided at a circumference of the metal core.

Abstract: According to one embodiment, a component-embedded printed wiring board includes a base including a component mounting surface, a pair of conductive patterns which is disposed on the component mounting surface of the base, and a circuit component which is mounted on the base so as to be in close contact with the component mounting surface between the conductive patterns and electrically connected to the conductive patterns.

Abstract: A high frequency coaxial through hole via in a multilayer printed circuit board is presented. The high frequency coaxial through hole via may include two traces connected by a plated through hole via and surrounded by more than one ground plane, where the more than one ground planes are capacitively coupled.

Abstract: A low thermal impedance printed circuit board assembly compatible with surface mount assembly reflow solder processes is presented. The low thermal impedance printed circuit board assembly may have filled vias soldered directly to solder balls of the surface mount assembly.

Abstract: Enclosures for at least partially shielding an at least partially enclosed volume from electromagnetic interference and various methods for producing such enclosures are described. Enclosures for at least partially shielding an at least partially enclosed volume from electromagnetic interference may be prepared by bonding at least two sections of carbon foam with a carbonizable binder to provide an enclosure, wherein said enclosure defines an at least partially enclosed volume, and carbonizing the carbonizable binder to provide an electrically conductive carbon char. An enclosure for at least partially shielding an at least partially enclosed volume from electromagnetic interference may include at least two sections of electrically conductive carbon foam interconnected by an electrically conductive carbon char. The electrically conductive carbon char is substantially electrically continuous with the sections of electrically conductive carbon foam.

Abstract: Stand-alone conformal coverings for electronic devices and methods of making and using such coverings.

Abstract: A method for sealing a cable in an enclosure includes assembling a first portion and a second portion of a cable seal around a cable. The first and second portions of the cable seal define a central axial opening having a sealing surface. The cable is disposed in the central axial opening. The method further includes inserting the cable seal and cable through an entrance of a generally u-shaped cable entry point of a side of an enclosure and positioning the cable seal within the cable entry point such that the cable seal protrudes from opposite surfaces of the side. An outer gasket seals between the surfaces of the side of the enclosure and the cable seal.

Abstract: In a snap-in electrical connector for attaching helical metal cable and conduit to a junction box or the like, the connector having the locking ring with flexible tabs engageable with the cable/conduit, the improvement wherein the tabs have legs angled inwardly of the ring at specified angles, tips that form specified angles with the legs, and tip ends that are biased relative to the legs in the same direction. The specified angles of the legs, tips and tip ends provide improved pull-out strength, electrical conductivity and stability for a wide range of sizes and types of cable and conduit, including metal clad cable, armored cable, and flexible metal conduit, made of aluminum and steel.

Abstract: A system for reverse circulation in a wellbore include equipment for supplying drilling fluid into the wellbore bit via at least an annulus of the wellbore and returning the drilling fluid to a surface location via at least a bore of a wellbore tubular. The system also includes devices for controlling the annulus pressure associated with this reverse circulation. In one embodiment, an active pressure differential device increases the pressure wellbore annulus to at least partially offset a circulating pressure loss. In other embodiments, the system includes devices for decreasing the pressure in the annulus of the wellbore. For offshore application, annulus pressure is decreased to accommodate the pore and fracture pressures of a subsea formation. In still other embodiments, annulus pressure is decreased to cause an underbalanced condition in the well.

Abstract: Electrically powered electromagnetic field source beacons installed in a reference well in combination with a down-hole measurement while drilling (MWD) electronic survey instrument near the drill bit in the borehole being drilled permit distance and direction measurements for drilling guidance. Each magnetic field source beacon consists of a coil of wire wound on a steel coupling between two lengths of steel tubing in the reference well, and powered by an electronic package. Control circuitry in the electronic package continuously “listens” for, and recognizes, a “start” signal that is initiated by the driller. After a “start” signal has been received, the beacon is energized for a short time interval during which an electromagnetic field is generated, which is measured by the MWD apparatus.

Abstract: A system for sensing a borehole or formation characteristic at a selected depth while a drill string 12 is in the borehole 36 includes a plurality of sensors 40 to positioned at axially spaced locations along the drill string 12, and a data transmission system 46 for transmitting signals from each of the plurality of sensors to the surface. A surface computer 22 receives the transmitted signals and determining the sensed characteristics at a selected depth as a function of one of a plurality of sensors positioned along the drill string while at a first selected depth and subsequently another of the plurality of sensors is along the drill string while at substantially the first selected depth.

Abstract: A device is for channeling solids and fluids within a reverse circulating, fluid operated drill that has first and second ends, an axis extending between the ends, a casing and a piston. The casing has a bore extending between the drill ends and drive and valve chambers defined within the bore, the piston being movably disposed within the bore. The channeling device includes an elongated body disposeable within the casing bore so as to extend along the casing axis and through the piston. The body has a longitudinal axis, a first end locatable proximal to the drill first end, and a second end spaced from the first end and locatable proximal to the drill second end. A material transport passages extends axially between the two body ends and provides a path for moving solid materials through the drill. A fluid passage is configured to couple the valve and drive chambers.

Abstract: A cuttings bed removal tool for use on a drill string in a well bore includes: a sub having a region of enlarged outer diameter over the string diameters indicated by its upper end connection and an indicator disposed downhole of the region of enlarged outer diameter and having at least one bypass port extending through the indicator to permit passage of fluid in an upward direction through the indicator.

Abstract: In a drilling operation, where used drilling fluid is screened into a substantially solid portion and a substantially liquid drilling fluid and the drilling fluid is thereafter stored in a storage tank. A method and apparatus for of separating solids from liquids. The apparatus comprises a recirculation tank having a second liquid for receiving the solid portion, and a first rotational particle separator for separating the solid portion from the second liquid. The apparatus further includes a pump for pumping the solid portion and the second liquid from the recirculation tank to the first rotational particle separator and a bin region to receive and retain the separated solids from the first rotational particle separator, wherein the separated second liquid is returned to the recirculation tank.

Abstract: The invention relates to a construction device comprising a carrier vehicle with an undercarriage, a mast element arranged at the front side of the carrier vehicle and a winch drum, which is supported in a rotatable manner on the carrier vehicle. In accordance with the invention provision is made for the winch drum to be adjustable between a first position, in which it is arranged on the upper side of the carrier vehicle, and a second position, in which it is arranged in a rear portion of the carrier vehicle.

Abstract: Disclosed within is a drill bit with a plural set of blades having redundant cutter elements and single sets of blades having unique cutter element arrangements. The redundant cutter elements have equivalent longitudinal and axial spacing as corresponding cutter elements. The distance from a longitudinal axis of the bit to a redundant cutter element is equivalent to the distance from the longitudinal axis to the corresponding cutter element.

Abstract: A drill bit for drilling a borehole includes a cutter element comprising a base portion. In addition, the cutter element comprises a cutting portion extending from the base portion and terminating in an elongate crest extending between a first crest end and a second crest end, and having an intermediate portion therebetween. The first crest end has a width W1 and the second end has a width W2 that is greater than the width W1. Still further, the intermediate portion of the crest has a width W3 that is less than the width W2 and less than or equal to the width W1.

Abstract: A hard material head (1) for a rotary percussion drill bit (2) having an elongated shaft (15) including at least three cutting edges (4) distributed circumferentially within a circumscribing circle, a bottom surface (6) located opposite the cutting edges (4) and fastened by a material bond to an end (8) of the drill bit shaft (15) of the rotary percussion drill bit (2), concave side surfaces (5) formed circumferentially between adjacent cutting edges (4), and a peripheral pocket (9) opening toward the bottom surface (6) and formed, respectively, in at least two concave side surfaces (5) located opposite one another, and in which a corresponding axial pin (10, 10?) formed on a shaft end (8) is form-locking engageable.

Abstract: A cutting element for a drill bit that includes an outer support element having at least a bottom portion and a side portion; and an inner rotatable cutting element, a portion of which is disposed in the outer support element, wherin the inner rotatable cutting element includes a substrate and a diamond cutting face having a thickness of at least 0.050 inches disposed on an upper surface of the substrate; and wherein a distance from an upper surface of the diamond cutting face to a bearing surface between the inner rotatable cutting element and the outer support element ranges from 0 to about 0.300 inches is disclosed.

Abstract: A continuous quantitative discharging device comprising a material reserving chamber for storing material continuously supplied from a material supply means; a material storage tank having at a top a material inlet separated from said material reserving chamber for storing material fallen from said material reserving chamber and having at a lower part a discharge means capable of continuously and quantitatively discharging the stored material therefrom; a load cell type mass weighing part having a carrying arm secured to only said material storage tank in said material storage tank and supporting said carrying arm by a load cell provided on a support frame separated from said material storage tank in a non-contact state; and a controller for monitoring the weighed value of said load cell and controlling the discharge of material from said discharge means and/or the supply of material into said material storage tank.

Abstract: A lift and weighing system comprises two lift arm assemblies directly and mechanically coupled to at least two weight-measuring devices. The system may further comprise a first elongated support member extending between and coupling to the two weight-measuring devices, and a second elongated support member interposed between and rigidly affixed on opposing sides thereof to the lift arm assemblies and/or the weight-measuring devices to protect the weight-measuring devices from side loads. The system further comprises at least two end plate adaptors respectively positioned on and rigidly attached toward opposing ends of the elongated support member and adapted to rotatably engage an external actuating system configured to operate the lift and weighing system. In another embodiment, the weight-measuring devices are housed in the elongated support member.

Abstract: A system comprising a plurality of power supplies coupled to a power grid via multiple connections. The system also comprises a connector coupled to one of the connections via a backup connection. If the system receives power from no more than one power grid, the connector couples the backup connection to a backup power supply. If the system receives power from multiple power grids, the backup connection does not carry a substantial electrical current.

Abstract: A method is for controlling the torque of a hybrid drive unit, which includes a combustion engine and at least one electric machine capable of being operated alternatively as a motor or as a generator. The electric machine, when operated as a motor, is powered by an energy storage device and supplies a positive electric motor torque which together with a combustion engine torque of the combustion engine produces a total drive torque of the hybrid drive unit. A hybrid drive unit includes a respective torque control. In the event that a desired torque is greater than a consumption-optimized combustion engine maximum torque, the electric machine is operated as a motor having an electric motor torque. An electric motor maximum torque is specified as a function of at least one state parameter of the energy storage device.

Abstract: A drive state shift control apparatus and method switches a hybrid drive (HEV) mode to an electric drive (EV) mode without engine stoppage shock or eliminates gearshifting shock in an electric vehicle. In response to a decrease in accelerator opening APO, a request for fourth-to-fifth upshift is issued, then request for HEV-to-EV mode shift is issued. At the time of the upshift, a direct clutch D/C is disengaged. At a first time interval after the mode shift is issued, a first clutch is disengaged. At a second time interval after the mode shift is issued, the engine begins to stop and the rotational speed of the motor-generator is controlled so that the speed falls to a predetermined rotational speed close to an after-gearshift rotational speed within a target shifting time interval. When the rotational speed reaches the predetermined rotational speed, a front brake Fr/B is engaged to perform a fourth-to-fifth upshift, and the torque of the motor is controlled so as to engage the one-way clutch smoothly.

Abstract: Four-wheel electric-drive rolling vehicle (10) with front steering wheels (11) connected to a chassis (12) by means of an articulated quadrilateral front suspension group (15) and rear wheels (14) connected to said chassis (12) by means of independent, longitudinal arm suspensions (16), comprising at least a pair of electric driving motors (21), an electric motor for each of the front wheels (11) respectively, and/or an electric motor for each of the rear wheels (14), said motors (21) being fed by at least one electric accumulator group (22), through electric wire connections and at least one control board (23).

Abstract: A power system suitable for use in a transportation device is provided. The power system includes an engine, a gas tank and a gas pipe. The engine has at least a gas cylinder with a piston. The gas tank is used for storing a high pressure noninflammable gas. The gas pipe is connected to the engine and the gas tank. The high pressure noninflammable gas is delivered into the cylinder via the gas pipe to drive the piston so as to drive and move the transportation device. Therefore the transportation device of the present invention can replace the transportation device which uses fuel as the power source.

Abstract: A suspension system for a seat of a vehicle comprises a base, a linkage, and a seat attached to the base via the linkage. A pneumatic shock absorber provides a respective resistance level against movement of the seat with respect to the base based on a corresponding pressure level of air or gas within the pneumatic shock absorber. A set of cylindrical members are spaced apart beneath the seat. A tension member is arranged to engage the cylindrical members. The tension member is attached to the seat via a bracket. An electric motor is capable of driving one of the cylindrical members. A first sensor is arranged to detect first sensor data associated with an instantaneous position of the seat versus time. A controller generates a first control signal for the electric motor to change a height of the seat in opposition to a change in the instantaneous position of the seat and a second control signal to change the pressure level.

Abstract: A two or more person RUV (recreational utility vehicle) is provided with a multi-place multi-planar saddle seat assembly, multi-place multi-planar foot board assemblies, and grip handles.