Abstract: A pneumatic tire (10) is provided with air chambers which have recessed portions (221), and also with constriction grooves which communicate with the air chambers and a circumferential groove (21), and the air chambers and the constriction grooves are formed in a rib-shaped land portion of the tire. The depth (DP1) of a recessed portion (221) measured from a land portion (211) making contact with the road surface is deeper at one end of the air chamber in the tire circumference direction than the other end of the air chamber. The height of the recessed portion (221) from the bottom surface (222) thereof to the ground contact surface varies in the circumferential direction of the tire. The volume of the space formed by a constriction groove and the road surface is less than the volume of the space of the air chamber formed by the recessed portion (221) and the road surface.

Abstract: A self-inflating tire assembly includes one or more air tube(s) connected to a tire and having a plurality of adjoining diaphragm chambers separated by a one-way valve. An air passageway extends through the air tube and the diaphragm chambers. The one-way valve allows a directional passage of air through the valve from an inlet valve side an outlet valve side. The footprint in a rotating tire sequentially collapses the diaphragm chambers to directionally pump air through the one-way valve between the diaphragm chambers and along the air passageway from an air tube inlet device to an air tube outlet device.

Abstract: A pneumatic tire has a pair of bead portions, side wall portions extending to an outer side in a tire diametrical direction from the bead portions, and a tread portion connected to an outer end in a tire diametrical direction of each of the side wall portions. An outer wall surface of the side wall portion is provided with a circumferential projection annularly extending along a tire circumferential direction, and a plurality of diametrical projections extending to an inner side in a tire diametrical direction from the circumferential projection and arranged so as to be spaced in the tire circumferential direction. A gap portion formed between the diametrical projections is open to an inner side in the tire diametrical direction.

Abstract: A high frequency sewing machine for intermittently transferring a work material mounted on a work material mounting plate by means of feed dogs which perform synthetic circular movement in horizontal and vertical directions and which cooperate with a presser foot to effect the continuous bonding of the overlapped portions of a fiber cloth which are continuously bonded together by means of a thermoplastic resin tape held between the overlapped portions of the fiber cloth in the work material to melt under high frequency dielectric heating. High frequency power is applied between a pair of planar electrodes respectively disposed above and below the work material during the time when the transfer by these feed dogs is stopped to effect the melting process. The occurrence of defective products having burn or the like due to heat concentration can be prevented while obtaining assured uniform bonding strength by using the high frequency power.

Abstract: A fiber placement system including positioner and a fiber delivery apparatus having a creel assembly and a fiber placement head is provided. The positioner moves the entire fiber delivery apparatus including the creel assembly and the fiber placement head via at least three linear degrees of freedom. The fiber delivery apparatus includes an articulating wrist for moving the fiber placement head relative to the creel assembly. The fiber placement apparatus is substantially free of linear degrees of freedom within the fiber tow paths between the spools and the fiber placement head. One or more rotational degrees of freedom may be provided along the tow path. In one embodiment, the interface between the fiber delivery apparatus and the positioner is laterally offset such that a portion of the creel axially overlaps with vertical ram of the positioner.

Abstract: A mandrel for processing a part comprises an outer sleeve and a generally flexible inner core. The outer sleeve includes at least one flexible portion along its length allowing the sleeve to flex to a desired contour.

Abstract: Device for attaching a first product to a second product includes an ultrasonic welding device intended and adapted to realize a durable welded connection between a wall of the first product and the second product. The welding device includes an ultrasonic welding torch and an anvil which are each displaceable between a rest position, clear of the first product and the second product, and an active position opposite each other in which a wall part of the first product and a strip-like part of the second product lie therebetween. First supply elements are provided for supplying the first product to the welding device. Second supply elements are available and intended for moving the second product to the wall of the first product. The welding device includes a displaceable support arm from which the anvil extends together with at least one of the second supply elements and the ultrasonic welding torch.

Abstract: Movable partition systems include a drive mechanism including a motor positioned at least partially on a side of a track opposite a movable partition. Automatically movable partition systems include a movable partition movable along a track and a motor configured to move the movable partition, the motor positioned on a side of the track opposite the movable partition. Methods of installing a movable partition system include coupling a movable partition to a track, positioning a drive mechanism at least partially on a side of the track opposite the movable partition, and coupling an elongated drive member to the movable partition. Methods of moving a movable partition along a track include actuating a drive mechanism positioned at least substantially in a header recess. Drive modules for a movable partition system and other methods of installing a movable partition system including attaching a motor to a section of track are also disclosed.

Abstract: A retractable covering for an arched window including a first and a second panel formed of pliable material. A flap of the first panel overlaps a flap of the second panel. The first and second panels together have a generally arch-shaped upper perimeter adapted to be secured to a support structure and have a generally straight lower perimeter. A retracting mechanism moves the first and second panels between a closed position wherein the arched window is substantially covered and an open position wherein the arched window is substantially uncovered. The retracting mechanism includes a first cord secured to the first panel flap, and a second cord secured to the second panel flap. The retracting mechanism having a first operating state to position the first and second panels in the open position and a second operating state wherein the first and second panels are positioned in the closed. The retracting mechanism further includes a cord guide through which at least a portion of the first and second cords extend.

Abstract: Disclosed herein is a folding security window, in which an end of the security window is mounted to a window sill, the other end of the security window is connected to a window, a height-adjustable movable part is mounted to a vertical pole of the security window, a connecting means for connecting or disconnecting the security window to or from the window is provided, and the folded security window is not exposed to the outside. When the window is opened or closed, the security window is unfolded or folded, so that the security window does not spoil the appearance of the city. The movable parts mounted to upper and lower ends of the vertical pole enhance the adaptability and movability of the security window. The security window efficiently performs its original function without hindering ventilation, views, or light admittance.

Abstract: System and method of producing multi-layered aluminum alloy products are disclosed. A multi-layered aluminum alloy product may be formed by first heating a first aluminum alloy to a first temperature where the first temperature is at least about 5° C. lower than the eutectic temperature of the first aluminum alloy, second heating a second aluminum alloy to a second temperature where the second temperature is at least about 5° C. higher than the liquidus temperature of the second aluminum alloy, and coupling the second aluminum alloy to the first aluminum alloy to produce a multi-layered aluminum alloy product.

Abstract: The present invention provides a housing having an aperture adapted to receive a heat transfer unit. The heat transfer unit attaches to the housing and directs a heat transfer sleeve into the housing. The heat transfer sleeve also provides an aperture adapted to receive a beverage. The heat transfer sleeve stores a heat transfer material including but not limited to a fluid, gel, or other substance that can be heated or cooled depending upon the desired effect on the beverage. The removable heat transfer unit releasably attaches to the housing for removal of the unit to heat or cool the heat transfer material for use in affecting the temperature of the beverage.

Abstract: A modular, water-to-air heat exchanger with flexible tubes is adjustable in length to conform to different size cooling coils and thus provides an inexpensive, retro-fittable run-around heat recovery for pre-existing air handling systems. The heat exchanger comprises multiple heat exchange tubes formed of flexible material in a shape that permits them to be lengthened or shortened by simply moving the headers toward or away from each other. Preferably, the tubes are formed of a flexible, non-resilient material such as copper, and are shaped in a serpentine or helical manner. In this way, the tubes can be drawn out to elongate the heat exchanger or compressed to shorten it, depending on the dimension of the cooling coil in the air handler. One convenient way to control the length of the flexible tubes is to support the headers on one or more adjustment bars, each having a threaded adjustment mechanism.

Abstract: A connector system is provided. The system includes a substantially circular interconnecting hub, and a plurality of circuit board bays configured substantially radially around the substantially circular interconnecting hub. Each circuit board bay has a plurality of aligned connectors configured to receive a circuit board. The interconnecting circuit hub has, for each individual circuit board bay, a direct data pathway connecting the individual circuit board bay to all remaining circuit board bays of the plurality of circuit board bays. Each of the plurality of circuit board bays can directly communicate through the interconnecting hub with each of the remaining circuit boards bays.

Abstract: A thin and flat type heat pipe with enhanced conductivity. Between an upper member 22 having a rectangular area 24b on a lower surface and a lower member 20 having a rectangular area 24a on an upper area are provided intermediate plate members 32, 30. The members 32, 30 are each formed with slits 8, constructing a vapor path extending a planar direction, communicating with the rectangular areas 24a, 24b of the members 22, 20, respectively. Thus, a sealed space is defined by the slits 8 and the rectangular areas 24a, 24b so that a refrigerant is enclosed in the sealed space. Capillary holes 10 are formed through non-slitted portions of the intermediate plate members 32, 30 so that each capillary hole 10 serves as a capillary path of flow extending vertically to communicate with the rectangular areas 24a, 24b of the members 22, 20.

Abstract: A heat exchanger tube (1), wherein a plurality of refrigerant passages (5) extending in the longitudinal direction of the tube are formed in a flat tube body (2) with a specified length parallel with each other in the lateral direction of the tube and, where the overall cross sectional area of the tube body (2) is (At), the overall cross sectional area of the refrigerant passage (5) is (Ac), the outer peripheral length of the tube body (2) is (L), and the overall inner peripheral length of the refrigerant passage (5) is (P), set so that the relation of Ac/At×100=30 to 55 and P/L×100=150 to 325 can be established, whereby a heat exchanging performance can be increased.

Abstract: A method of producing heavy oil from a heavy oil formation with steam assisted gravity drainage. The method begins by drilling a borehole into a heavy oil formation comprising a steam barrier between a first pay zone and a second pay zone, wherein the steam barrier prevents a steam chamber to be formed between the first pay zone and the second pay zone. The steam barrier is then heated with a radio frequency. The steam barrier is then fractured to permit a steam chamber to be formed within the first pay zone and the second pay zone. Heavy oil is then produced from the heavy oil formation with steam assisted gravity drainage.

Abstract: Systems and methods that include providing, e.g., obtaining or preparing, a material that includes a hydrocarbon carried by an inorganic substrate, and exposing the material to a plurality of energetic particles, such as accelerated charged particles, such as electrons or ions.

Abstract: Methods, apparatus and systems for controllably mobilizing, flowing and maneuvering the flow of hydrocarbon-containing materials within and about a subterranean reservoir. The system comprises selectively positioning at a ground surface level above a subterranean reservoir containing hydrocarbon-containing materials, at least three seismic apparatus spaced apart in a triangulated configuration. The system is provided with an electronic seismic control device configured to controllably communicate with and cooperate with each of the seismic apparatus to concurrently modulate the amplitudes and frequencies of the vibrational energies produced therefrom. The system is provided with a sensing apparatus configured to detect and monitor changes in the fluidity and movement of the hydrocarbon-containing materials about the subterranean reservoir.

Abstract: The invention is directed to a hydraulic actuated pump system which lifts production fluids and re-circulating hydraulic fluid from a petroleum well. Additives may be added to the hydraulic fluid to apply direct chemical treatment to the production formation. A sonic stimulator may be included to stimulate and produce the same liquids from the horizontal section of the well.

Abstract: A method for deploying a completion string in a previously drilled borehole includes rotating the string at the surface while axially urging the assembly deeper into the borehole. This rotation is preferably only partially transferred down the completion string such that a lower portion of the string typically remains rotationally stationary with respect to the borehole. The completion string may be reciprocated upwards and downwards from the surface so as to enable the lower portion of the completion string to rotate. The completion string may alternatively be rotated back and forth, alternating between first and second rotational directions so as to maintain an applied surface torque below a predetermined threshold. The invention has been found to reduce drag between a completion assembly and the wall of a previously drilled borehole.

Abstract: A valve (30) for a production liner (12) in connection with the extraction of oil and gas, arranged to automatically shut of the flow of fluid into the production liner (12) in the event of a gas break-through, whereby the valve (30) comprises a valve seating (32) containing at least one central inflow channel (34) and one or more outflow channels (36, 38) from the valve (30). The valve (30) is constructed with a curved design equal to the shape of the outer diameter of the production liner (12), and is placed on the outside of the production liner (12), and in that a rectangular shut off disk (40) with the same curving is arranged in the valve (30), in the flowing path of the liquid flow, to cause a high velocity flow over the shut off disk's surface (40a) against the valve seat (32), wherein the shut off disk (40) is adapted to seal against said valve seat (32) dependant on the differential pressure being produced by the viscosity of the passing flow.

Abstract: Methods of treating a subterranean formation can comprise introducing a pre-flush fluid into a subterranean formation having particulate matter therein; introducing a curable adhesive composition comprising a silane coupling agent and a polymer, the polymer having a reactive silicon end group, into the subterranean formation subsequent to the pre-flush fluid; introducing an aqueous post-flush fluid into the subterranean formation subsequent to the curable adhesive composition; and allowing the curable adhesive composition to at least partially consolidate particulate matter within the subterranean formation.

Abstract: Systems, methods, and apparatuses involve selecting an aperture geometry to filter solids from fluid from a subterranean zone, the aperture geometry selected based on a distribution of sizes of particles in the fluid from the subterranean zone. A laser can be used to form slots with the selected aperture geometry in a casing installed in a well in the subterranean zone, the aperture geometry having a size selected based on the distribution of sizes of the particles.

Abstract: A method is proposed for heating a hydrocarbons reservoir, comprising the provision of an installation comprising: a first wellbore equipped with an injection string fitted with an adjustable choke and an extraction string fitted with an adjustable choke, a set of sensors, intended to measure physical variables, an automatic device making it possible to control and monitor the operation of the installation; the circulation of steam from one string to the other; the control of the steam injection flow rate in function of a target value; the keeping of a set of physical variables within a predetermined range of values by continuous action of the automatic device on the choke of the injection string, and on the choke of the extraction string.

Abstract: Oil sands and like host materials are leached with a selected leachant to render pumpable the oil (including heavy oil, bitumen or kerogen and asphaltenes) as leachate. In a preferred embodiment, natural deposits are in situ leached and the leachate recovered and removed for treatment. The leachant is separated and recycled. The leachant is selected to be biodegradable and to not precipate asphaltenes, and to comprise monoterpenes of the formula C10H16. The overall process allows environmentally acceptable resource development and contaminated site remediation.

Abstract: A wellbore ball valve includes a ball-type valve closure having an interior, central bore. A lower ball carrying assembly defines a first annular, sealing seat surface in contact with and adapted to seal with the exterior of the valve closure. The first seat surface defines a first through hole. An upper assembly defines a second annular seat surface in contact with the exterior of the valve closure. The second seat surface defines a second through hole. The second through hole is shaped differently from the first through hole in that it at least partially overlaps with the central bore while the first through hole is sealed from the central bore.

Abstract: A downhole valve that operates on turning of a member having a passage through it with a control system also features a passage from above an uphole seat for the member which communicates to the isolated passage within the member when the valve is closed. The passage features a check valve assembly that preferably has redundant sealing features and filters to prevent debris entry. Pressure applied from above the closed member gets through the check valve assembly to equalize the higher pressure below the ball with the pressure raised in the ball from pressure application at the surface. Removal of the applied pressure reseats the check valve or valves to allow the hydraulic system to rotate the member while the member is no longer subject to a high differential pressure.

Abstract: Methods and apparatus enable reliable and improved isolation between two portions of a bore extending through a casing string disposed in a borehole. A downhole deployment valve (DDV) may provide the isolation utilizing a valve member such as a flapper that is disposed in a housing of the DDV and is designed to close against a seat within the housing. The DDV includes an operating mechanism for opening/closing the DDV. In use, pressure in one portion of a well that is in fluid communication with a well surface may be bled off and open at well surface while maintaining pressure in another portion of the casing string beyond the DDV.

Abstract: Methods and devices for restoring control of at an offshore oil well following an uncontrolled fluid release after an explosion include lowering through a riser of successive flow restricting inserts into the oil well to gradually reduce the uncontrolled fluid release. Flow restricting inserts may be inserted in parallel or in series with each other. Following attachment of the riser to the oil well, provisions are made to restore oil production from the well. Flow restricting inserts may further be used to adjust flow resistance from the well in order to optimize oil production. Passages between the riser and the flow restricting inserts may also be used to form a gas lift in order to maximize production of oil from the well.

Abstract: An underwater placed assembly produces gas or gas and oil/condensate from a subsea gaseous reservoir, where at least one production well is provided from the seabed to a production zone and at least one water injection well is provided from the seabed to an injection zone. The assembly includes: a pressure increasing device connected to the outlet of the production well in order to increase the pressure in a production flow from the production well, and a water turbine that is connected to and driving the pressure increasing device.

Abstract: Apparatus and method for containing and recovering undersea oil or gas well leakage by reason of the leaked fluid being lighter than sea water may include a canopy, or a series of interconnected canopies, which, when placed over a leak site, allow leaked fluid to be captured and displace sea water with the canopy or series of canopies having an arrangement, such as one or more conduits, for flow of leaked fluid upward from a respective canopy to the surface. With a system with multiple canopies in a series with exit arrangements for leaked fluid from a lower canopy to a next upper canopy, the series can readily extend from the surface to a great depth and allow transfer of volumes of the leaked fluid that are not limited by the capacity of canopies or conduits at deep locations.

Abstract: A method of installing or retrieving a pumping system into or from a live wellbore includes connecting a lubricator to a production tree of the live wellbore and raising or lowering one or more downhole components of the pumping system from or into the wellbore using the lubricator.

Abstract: A method and apparatus for retro-fitting an explosive setting tool to a non-explosive setting tool is provided to eliminate the use of pyrotechnics when setting auxiliary tools. An explosive setting tool is retro-fitted by removing the pyrotechnic elements of the tool and replacing them with a conversion assembly including a hydraulic pump, thus converting the explosive tool into a non-explosive tool. The hydraulic pump provides the energy necessary to set the auxiliary tool. Once the auxiliary tool has been set, the non-explosive setting tool can be brought to the surface and reset using a resetting tool.

Abstract: A downhole tool includes a lock for maintaining a slip in a reduced diameter position when running the tool in the well, and selectively releases the slip to move radially outward to a set position to suspend an anchored portion of the tool within a downhole tubular. The tool includes a mandrel having a through passage, with a hydraulic port within the mandrel that is closed to mandrel internal pressure as the tool is run in the wellbore. A ball seat covers hydraulic ports in the mandrel. A ball may be dropped to seat and increase pressure to open the ports. A piston moves in response to mandrel internal pressure applied through the hydraulic port to unlock the locking device, such that further movement of the piston releases the slip from the reduced diameter position to the set position.

Abstract: A drill string flow control valve may comprise a valve housing, a valve sleeve axially movable within a valve housing from a closed position to an open position, a biasing mechanism biasing the valve sleeve into a closed position, and a plurality of pressure ports for allowing a differential pressure to be exerted on the valve sleeve. The valve may include a piston axially movable within the valve housing and bearing against the valve sleeve which piston may be used to initiate movement of the valve sleeve. The piston includes a flow passage therethrough in fluid communication with the interior of the valve sleeve and a ball valve disposed to control fluid flow through the piston. The valve may include a flow restriction in the flow path within the valve sleeve and disposed between pressure ports formed in the wall of the valve sleeve. Methods of use are also provided.

Abstract: The roof-mounted remotely controlled firefighting tower is disposed on the top of the roof of a building and is controlled by a wireless, remote control device. Atop the tower there is a receiver that receives command signals from the remote control device. The firefighting apparatus includes a control set that has electrical and electronic circuits inside and is in operable communication with a motor and gear train engaging a telescoping mast to raise and lower the mast according to wirelessly transmitted commands from a user. A high pressure pump extracts water and foam from a tank and sends it to a distribution vessel on top of the mast. An inverted sprinkler dish distributes the foam and water under pressure to top and sides of the building via the connected sprinklers and water booms.

Abstract: A front end loader attachment for picking and sorting objects, including picking rocks and sorting them from soil. An embodiment of the attachment is a device comprising a rotatable drum having a longitudinal axis, a mount for reversibly mounting the attachment to the front end loader, and a rotator assembly, with the drum comprising a base and an opposing opening defined by sidewalls connected to the base, wherein the sidewalls comprises a plurality of openings and the rotator assembly is operable to rotate the drum about the longitudinal axis.

Abstract: An improved multi drill cultivator which mainly consists of octagonal central drum (2), gear housing Assembly which further comprise of four big gears, four bevel gears and cover (3.i), teeth for big gears, chassis, drill Ploughing Assembly further comprises of projected portion and drills, bearing housing further comprises of bearing and collar for bearing, rear wheel Assembly further comprises of rear wheel and rear wheel axle, front wheel assembly further comprise of front wheel and front wheel bracket, front wheel bracket hub, one end of front wheel, other end of front wheel bracket, lock nut, A jack screw mechanism consists of lifting screw steering wheel, a guide bar being attached to the lifting screw steering wheel, drum lifting block and a ball wherein the said ball is fixed into the locking for ball, provided at the end of the said jack screw mechanism assembly.

Abstract: A mount for carrying a plurality of field-conditioning implements selected from trash whipping implements, rolling baskets and coulters for connection to a planter or other multi-row implement is disclosed. A height and force adjustable mounting system is also disclosed that enables the force of such an implement on the soil to be modulated as desired.

Abstract: A tillage implement has gang assemblies of rotatable tillage tools that can be angle-adjusted from the seat of the towing tractor using hydraulic actuators. The tillage tools may comprise generally flat, wavy coulter blades or the like so that the machine may be set up for vertical tillage with the coulters aligned at a zero degree angle with the path of travel of the implement or for residue management operations with the coulters maintained at an oblique angle of up to ten degrees relative to the path of travel. A six degree angle is preferred for the residue management position. A master-slave hydraulic flow arrangement for the actuators assures simultaneous actuation, while mechanical synchronizing apparatus between the two front gang assemblies on the center frame section of the machine assures synchronized movement of those assemblies. Mechanical motion-transmitting mechanism transmits the hydraulically powered adjusting movement of the front gang assemblies to the rear gang assemblies.

Abstract: An electric power tool includes a body part for outputting a rotational force at one end thereof, a grip part provided to extend from the body part in an intersecting relationship with the body part, and a suspension link provided at the other end of the body part for hanging the body part. The suspension link is configured to ensure that, if the body part is suspended from the suspension link using the suspension link as a pivot point, the electric power tool is kept by a weight balance in a horizontal posture in which the extension direction of the grip part is substantially orthogonal to the vertical direction or an inclined horizontal posture in which the joint portion of the body part and the grip part is positioned at the upper side.

Abstract: A percussion mechanism that has a motor, a drive piston which can be moved to and fro in a guide cylinder by the motor, and a percussion piston. A coupling device is active between the drive piston and the percussion piston, via which coupling device the movement of the drive piston is transmitted to the percussion piston. The motor can be configured as a reluctance motor or as a synchronous motor. The motor can be actuable in such a way that different rotational speeds of the rotor can be generated within a percussion cycle and/or from percussion cycle to percussion cycle.

Abstract: A percussive mechanism, which is provided in the form of an, e.g. pneumatic spring percussive mechanism, comprises an electrodynamic linear drive, a drive piston, which can be reciprocally moved inside a percussive mechanism housing by the linear drive, and a percussive piston. An additional hollow space is provided in front of and/or behind the drive piston and can be isolated at least in part from the surrounding area so that a pneumatic spring can be created in the additional hollow space. The pneumatic spring slows the drive piston at its returning points and facilitates a returning motion without loading the electrodynamic linear drive.

Abstract: The invention relates to a gearing, in particular for portable electric power tools, preferably for angle grinders, comprising an automatic locking device (6, 15). According to the invention, provision is made for damping elements (20) to be integrated in the locking device module.

Abstract: Apparatus and methods for drilling with casing. In an embodiment, methods and apparatus for deflecting casing using a diverter apparatus are disclosed. In another embodiment, the apparatus comprises a motor operating system disposed in a motor system housing, a shaft operatively connected to the motor operating system, the shaft having a passageway, and a divert assembly disposed to direct fluid flow selectively to the motor operating system and the passageway in the shaft. In another aspect, methods and apparatus for directionally drilling a casing into the formation are disclosed. Methods and apparatus for measuring the trajectory of a wellbore while directionally drilling a casing into the formation are also described.

Abstract: This disclosure relates in general to a method and a system for directionally drilling a borehole with a rotary drilling system. More specifically, but not by way of limitation, methods and system provide for controlling motion of the rotary drilling system in the borehole when a side force is applied to the drilling system to bias or focus the motion so that the drilling system directionally drills the borehole through an earth formation. In certain aspects, side cutting of a sidewall of the borehole by a drill bit under an applied side force is controlled by a geostationary element to provide for directional side cutting and, as a result, directional drilling of the borehole through the earth formation. In other aspects, a non-concentrically coupled gauge pad assembly may rotate with the drilling system and bias or focus the applied side force.

Abstract: The High LCM Positive Pulse MWD Component is designed to reduce the entry of LCM and debris into traditional positive pulse MWD systems by utilizing a screen positioned over the fluid ports. The component modifies the traditional poppet housing utilized in positive pulse MWD systems without changing the parameters of the fluid ports or changing the operation or need to recalibrate standard positive pulse MWD systems.

Abstract: Disclosed are hydrocarbon recovery drill string apparatus, subterranean hydrocarbon recovery drilling methods, and subterranean hydrocarbon recovery methods. In one embodiment, a hydrocarbon recovery drill string apparatus includes an elongated assembly within which a rotatable drill rod is received. The assembly comprises a longitudinal axis, a drill rod entrance end, and a drill rod exit end. The assembly comprises a tailcuttings diverter pipe proximate the drill rod exit end, with the tailcuttings diverter pipe defining an initial fluid flow path of the tailcuttings from the longitudinal axis which is acute from the longitudinal axis. Other apparatus and method aspects are contemplated.

Abstract: A method of reducing the viscosity of a water-based drilling fluid without requiring dilution. The method of reducing the viscosity of a water-based drilling fluid, includes: providing a water-based drilling fluid containing a peroxide degradable polymer and a weighting agent, adding a viscosity reducing additive containing an inorganic peroxide to the water-based drilling fluid while maintaining the pH of the water-based drilling fluid at a pH greater than about 8, circulating the water-based drilling fluid having a pH greater than about 8 through a wellbore, and heating the circulating water-based drilling fluid to a temperature of at least about 150° F. so as to activate the inorganic peroxide to degrade the peroxide degradable polymer.