Abstract: A system for heating a door guide area includes: a first and second conduit for channeling a flow of heated air; a heater fluidly connected to the first conduit and configured to provide air to the first and second conduits; first and second openings providing fluid communication between the first and second conduits to allow the air to circulate through the first and second conduits; a heat transfer wall part of the second conduit, to transfer heat from the flow of heated air in the second direction to a space outside of the second conduit that is defined, in part, by the heat transfer wall; and two side supports connected to the heat transfer wall, the side supports located opposing each other and dimensioned and located along with the heat transfer wall to form three sides to encompass a portion of a roll-up door.

Abstract: The present invention relates to a gate with an emergency opening device, comprising a gate panel which is movable between an open and a closed position, a primary motor which drives the gate panel by way of a gate panel drive, and an auxiliary motor which is connected to an emergency power supply and is adapted to drive the gate panel. In order to improve such a gate to the extent that the emergency opening device is reliably usable to open the gate in the event of different types of failure of the main drive motor of the gate, it is proposed that the auxiliary motor be coupled by way of an auxiliary motor coupling to the gate panel and that the emergency power supply comprise an energy storage.

Abstract: The preset invention relates to a gate with a crash-down prevention mechanism, comprising a gate panel which can be opened and closed by the rotation of a gate panel drive, a motor which is coupled to the gate panel drive, and a braking assembly with which opening and/or closing the gate panel can be decelerated, and a first measuring device for determining at least one movement parameter of the gate panel. In order to improve such a gate to the extent that a crash down of the gate can be reliably detected, and a braking assembly which brakes the gate quickly and avoids damage to the gate is triggered just as reliably, it is proposed to provide a second measuring device for determining at least one movement parameter of the motor, and a comparator which compares the measured movement parameters of the gate panel and the motor and triggers the braking assembly when the measured movement parameters of the gate panel and the motor fall outside of a defined relationship to each other.

Abstract: A double door gate apparatus having a frame, a main gate and a secondary gate, where the apparatus includes the unique features of a) a latch apparatus between uppermost framework members of the main gate and secondary gate, b) the latch apparatus being weighted to return to a normally closed position, c) each of the main gate and secondary gates having an inverted U-shaped piece engaging the bottommost horizontal member such that each of the main and secondary gates need to be lifted prior to being opened and prior to being closed, and d) a pair of hand wheels on a common shaft that work together to space the double door gate apparatus a desired distance from a vertical surface such as a wall.

Abstract: A telescopically extendable and collapsible ladder assembly includes multiple collapsible ladder sections provided with an air damper at the bottom end of tubular stile members. The air dampers provide retardation of gravity induced velocity of the collapsible ladder sections upon collapse of the ladder sections. Multiple air dampers include a throttle valve securing device, for cooperating with a throttle valve of the air damper when the collapsible ladder section is in the collapsed position, to secure the throttle valve in its throttle position and/or an obturator device. The obturator device includes a first obturator member and a second obturator member where the first obturator member and the second obturator member are configured to, when the collapsible ladder section is in the collapsed position, in combination provide additional throttling.

Abstract: A retractable ladder assembly comprising a lower frame fixed below an enclosure for a mechanical closure device and a moveable upper frame. The upper frame is disposed below the enclosure or removed entirely from the enclosure when not in use to prevent access from unauthorized personnel. The lower end of the upper frame engages the upper end of the lower frame and a link member on the upper frame engages an anchor within the enclosure to establish an extended ladder mode.

Abstract: A safety apparatus for coupling with a ladder and methods for manufacturing and using same. The safety apparatus includes a first engagement member for coupling with a first rail of a ladder and defining a first engagement member recess and a second engagement member for coupling with a second rail of the ladder and defining a second engagement member recess. A third engagement member can couple with the first and second rails and be rotatable between a first position for engaging a first support structure and a second position for at least partially enclosing a second support structure within the first and second engagement member recesses. The safety apparatus advantageously can alternatively engage horizontal support structures or vertical support structures to prevent falls.

Abstract: A rotation brake for stopping rotation of a spindle assembly on a horizontal directional drill. The rotation brake comprises a brake lock that is actuated by a cylinder and spring to interact with a non-rotating brake cap and a rotating pinion, thereby stopping rotation of the pinion. The brake lock is removed from the pinion by applying pressurized fluid to a cylinder such that a cylinder rod moves the brake lock out of a cavity between the brake cap and the pinion. Upon removing fluid pressure from the cylinder, a compressed spring moves the brake lock back to into the cavity, preventing rotation.

Abstract: The present invention is an accessory device that hole coring machine, wherein the hole coring machine is utilized to quickly and efficiently core holes in concrete and asphalt. The accessory device comprises a stabilizer assembly that is coupled to a base of the hole coring machine. The stabilizer assembly includes at least one stabilizing frame that is formed to the outside diameter of a drill saw bit of the hole coring machine. The at least one stabilizing frame is coupled to an air compressor that causes the stabilizing frame to move relative to the drill saw bit during operation of the hole coring machine. The at least one stabilizing frame aids in maintaining the shape of the drill saw bit and reduces vibration and binding of the drill saw bit while forming a hole in concrete and/or asphalt.

Abstract: A split roller cone and polycrystalline diamond compact (PDC) composite drill bit, including a PDC bit module, a split roller cone bit module, and a drill bit body module. The split roller cone bit module has split structure, and during the operation, the lower roller cone body and the upper roller cone body revolve with the drill bit, and rotate around the axle neck of the palm respectively, thereby achieving the task of scraping and breaking rocks. The tooth scraping efficiencies of the small-end ring gear and the middle ring gear are improved. The split roller cone bit module, the PDC bit module, and the drill bit body module can be mass-produced.

Abstract: A technique facilitates a drilling operation by providing a drill bit having limited magnetic influence. The drill bit comprises a bit head formed with a non-magnetic bit head material. Cutting elements may be attached to the bit head to facilitate cutting of rock and other formation material during drilling of a borehole. The drill bit also comprises a bit body formed with a non-magnetic body material. The bit head and the bit body are joined to construct a non-magnetic drill bit which has no or limited magnetic influences on, for example, sensors located proximate the drill bit.

Abstract: A frost removal system is for thawing frozen ground and a method removes frost from a selected area of frozen ground. The method can include providing at least one heat transfer device; auguring a hole into the frozen ground to at least a depth of the frost. The at least one heat transfer device is lowered into the selected area of frozen ground and self-augured to the predetermined depth. The at least one heat transfer device is heated and the heat is allowed to travel along a length of the at least one heat transfer device. Heat is applied from the at least one heat transfer device for thawing the selected area of frozen ground until the frost is removed. The removal system may also be used to remove moisture from saturated soil and to bake columns of soil with increased load-bearing capacity.

Abstract: Provided is an adjustable split thrust ring and a drilling system including the same. The adjustable split thrust ring, in one embodiment, includes a downhole split ring including two or more separate downhole pieces, the two or more separate downhole pieces fitting together to form a substantially circular downhole shoulder surrounding a substantially circular driveshaft. The adjustable split thrust ring further includes an uphole split ring positionable proximate the downhole split ring and including two or more separate uphole pieces, the two or more separate uphole pieces fitting together to form a substantially circular uphole shoulder surrounding the substantially circular driveshaft. In this embodiment, the substantially circular downhole shoulder and the substantially circular uphole shoulder are movable relative to one another to adjust to fit a groove in a driveshaft that they are configured to sit.

Abstract: An interface module has an outward interface with at least two ports for directly connecting to separate sections of a tool bus. The outward interface may have two uplink ports and one downlink port for layered tool bus applications. Each port has two electrical contacts for creating an electrical path between electronic assemblies with combined power & data transmission (CPDT) using a transmission line. A power port is connectable to an external power source via a common electrical path. A standardized inward interface of the interface module provides data and communication contact groups for data and power communication with assembly electronics. The interface module is implemented using advanced electronics packaging technology for easy installation on a printed circuit board. The interface module facilitates a streamlined downhole electronic testing configuration for testing electronics as they are developed prior to completion of development of dependent components.

Abstract: The disclosure relates to a sucker rod assembly for use in an oil well. The sucker rod assembly includes an elongated hollow rod having a threaded section at an end, a tubular connector having a threaded section at one end for engaging with the threaded section of the elongated hollow rod, and a second threaded section at the other end, and a tubular coupling having a threaded section at each end for engaging with the second threaded section of said tubular connector and with a second tubular coupling or sucker rod. The hollow rod, connector and coupling form a continuous hollow core for carrying fluid, cables, fiber optics or other materials.

Abstract: The multifunction wellbore conditioning tool (100, 200, 300) is installed in the bottom hole assembly of a drill string and performs the functions of a cutting tool, keyseat wiper, roller reamer, keyseat wiper, and stabilizer during drilling operations, precluding the need for multiple different tools in the drill string. The tool (100, 200, 300) has a working sleeve (114, 214, 314) captured concentrically on the driveshaft (102, 202, 302) between opposed spring sets (134, 136; 234, 236; 334, 336). The sleeve (114, 214, 314) remains rotationally stationary about the rotating driveshaft (102, 202, 302) when in its central or neutral position on the driveshaft (102, 202, 302). When the sleeve (114, 214, 314) shifts axially on the driveshaft (102, 202, 302) it engages a clutch mechanism that allows it to rotate with the driveshaft (102, 202, 302) so that the rotating working sleeve (114, 214, 314) conditions the borehole.

Abstract: A support system (12; 12?) for providing horizontal support to a riser (32) extending downward from a cantilever (18) along a well centre and into a body of water comprising a riser interface (48; 48?) and a tether arrangement (50; 50?). The support system (12; 12?) is configured to permit asymmetric placement of the riser interface (48; 48?) relative to the cantilever (18).

Abstract: A drilling unit on a deck of a floating vessel, includes a drill tower structure with a heave-compensation system, a winch mounted at or near the deck, a crown block mounted at a top side of the drill tower structure and at least one wire rope between the winch and the crown block. The heave-compensation system includes a slideable support frame configured to be moved in a direction substantially parallel to the axial direction of the drill tower structure. Either the winch or the crown block is positioned within the slideable support frame such that a distance between the winch and the crown block is controlled by at least one electric motor or linear actuator. In an alternative embodiment in which a crown block in not employed, the winch is placed in the slideable support frame at the top side of the drill tower structure.

Abstract: A mobile, coiled tubing drilling apparatus with a rotary drill head, the apparatus including a non-rotating mast on a mobile platform, the mast having mounted thereon an injector below a coiled tubing reel, the injector defining an operational axis for the coiled tubing, wherein the rotary drill head is pivotally mounted on the injector so as to be movable between a retracted position away from the operational axis and an operating position in line with the operational axis, the rotary drill head including a top swivel for non-rotating connection to the coiled tubing and a bottom spindle for rotating connection to a pipe section, the top swivel and the bottom spindle providing fluid communication between connected coiled tubing and connected pipe section during operation.

Abstract: A mobile, coiled tubing drilling apparatus, the apparatus including a non-rotating mast on a mobile platform, the mast having mounted thereon an injector, a coiled tubing reel having a tubing pay-off point associated therewith, and a tubing control system, wherein the tubing control system is between the reel and the injector, and includes a tubing abutment adjacent the tubing pay-off point for applying an opposite bend to the tubing during pay-out of the tubing, and the reel is mounted for horizontal (x,y) movement such that, during pay-out of the tubing, the tubing pay-off point can be maintained generally above the injector, and can also be moved towards or away from the tubing abutment.

Abstract: An apparatus for assembling a tubular string includes a rig drilling bail, a joint bail extender, and a device. The joint bail extender is rigidly coupled to the rig drilling bail. The device is coupled to the first joint bail extender and configured to engage a tubular segment.

Abstract: Systems and methods for determining the composition of a drilling fluid using electro-rheology may be provided. A method for drilling a wellbore may include circulating a drilling fluid in a wellbore. The method may include extending the wellbore into one or more subterranean formations. The method may include measuring one or more rheological properties of at least a portion of the drilling fluid while applying an electric field to the drilling fluid to obtain an electro-rheological profile of the portion of the drilling fluid. The method may include determining an estimate of a concentration of at least one additive of the drilling fluid based on the electro-rheological profile.

Abstract: A system and method for conveying a tool to a target sub within a tubular string having a number of subs. Each sub may include at least one ledge or shoulder in or on its interior surface that can be used as a latch stopper or stopper, for receiving and engagement with a latch. The subs may also have a latch deflector or deflector. In one embodiment, the latch deflector is a latch-deflection shoulder protruding into the internal diameter (ID) of the string for deflecting a latch, to be subsequently introduced, out of or into the latch-stopping shoulder. The distance between the latch stopper and the latch deflector, referred to as the “deflection radius,” may be used as an address that uniquely identifies each sub, and can vary from sub to sub.

Abstract: The invention provides an expanding and collapsing ring apparatus (10) and method of use. The expanding and collapsing ring comprises a plurality of elements (12) assembled together to form a ring structure oriented in a plane around a longitudinal axis. The ring structure defines an inner ring surface configured to be presented to a surface of an object (19) arranged internally to the ring structure. The ring structure is operable to be moved between a collapsed condition and a first expanded condition by movement of the plurality of elements. The plurality of elements is operable to be moved between the expanded and collapsed conditions by sliding with respect to one another in the plane of the ring structure. Applications of the invention include oilfield devices, connection systems, flow barriers and packers.

Abstract: A tool for cleaning out the lower end of a cased wellbore having an installed production string. The tool is lowered down the production string until it reaches a stationary position. In that position, a lower section of the tool projects through an opening at the base of the production string and into the wellbore. The tool sprays high pressure fluid from its fluid openings into nearby portions of the wellbore. To remove the tool from the production string, a deformable ball is lowered into a funnel sub installed within the tool. Fluid pressure is applied to the ball until the ball is extruded through the funnel sub and captured within a cage immediately below the funnel sub. Within the cage, the ball blocks upward flow of subterranean fluid into the funnel and through the tool. With no fluid passing through the tool, the upward fluid flow carries the tool to ground level.

Abstract: Apparatus and method for in-situ stabilization of unconsolidated sediment in core samples are disclosed. The core sampling apparatus includes a corer having an inner wall, an outer wall, and a plurality of impregnation tubes disposed between the inner and the outer wall, wherein the impregnation tubes are parallel to a central axis of the corer. The method for sampling a core includes extracting a core sample using a corer, and in-situ stabilizing unconsolidated sediment in the core sample within the corer by impregnating the core sample with a resin. The resin is supplied through a plurality of impregnation tubes disposed between the walls of the corer.

Abstract: Apparatus and method for in-situ stabilization of unconsolidated sediment in core samples are disclosed. The core sampling apparatus includes a corer having an inner wall, an outer wall, and a plurality of impregnation tubes disposed between the inner and the outer wall, wherein the impregnation tubes are parallel to a central axis of the corer. The method for sampling a core includes extracting a core sample using a corer, and in-situ stabilizing unconsolidated sediment in the core sample within the corer by impregnating the core sample with a resin. The resin is supplied through a plurality of impregnation tubes disposed between the walls of the corer.

Abstract: A testable back pressure valve for controlling fluid flow through a bore of a component installed in a well bore is disclosed. The back pressure valve includes a valve body which is configured to be secured in the bore, a flow bore which extends through the valve body, at least a first body seal which is configured to seal the valve body to the bore, and a poppet which is movably positioned in the valve body. At least a first poppet seal is sealingly engaged between the poppet and the valve body when the poppet is in the closed position, and a test port extends through the valve body to below the first poppet seal when the poppet is in the closed position. Thus, with the back pressure valve installed in the flow bore and the poppet in the closed position, the first poppet seal can be pressure tested by communicating test pressure through the test port to below the first poppet seal.

Abstract: A connector secures an ESP to coiled tubing containing a power cable. Upper and lower barriers in the connector housing define an upper chamber, a lower chamber, and a center chamber. An upper chamber dielectric fluid in the upper chamber is in fluid communication with the interior of the coiled tubing. A lower chamber dielectric fluid in the lower chamber is in fluid communication with motor lubricant in the motor of the ESP. Center chamber dielectric fluid in the center chamber is sealed from contact with the upper and lower chamber dielectric fluids by the upper and lower barriers. A thermal expansion device has a container portion for allowing center chamber dielectric fluid to expand into the container.

Abstract: A surface joint provides a sealing interface between pipe rams or variable-bore rams of a surface blowout preventer and a landing string. The surface joint may be used in a system including the surface blowout preventer, a subsea mudline closure device having a conventional configuration without additional pipe rams or variable-bore rams used to close on a slip joint, and a high-pressure riser.

Abstract: A control system and method for a blowout preventer (BOP) system in an oil rig is provided. An input module generates control inputs for required components of the blowout preventer system, and transmits the control inputs simultaneously as an operational input and a numerical input, where the operational input is transmitted to the required component of the blowout preventer system. A synchronized model is coupled to the input module to receive the numerical input, and to replicate an operation of the blowout preventer system based on the numerical input. The synchronized model also generates one or more model outputs based on the replication of the operation of the blowout preventer system.

Abstract: Frac ball dispensers as well systems and methods employing such are disclosed. Configurations for remotely moving the frac ball dispensers in the vicinity of an open wellhead as well as remotely activating and verifying the dispensement of frac balls from the dispensers into the open wellhead are specifically provided. Configurations of frac ball dispensers to control access to frac balls therein as well as the dispensement of frac balls therefrom are also provided.

Abstract: A radially expandable backup ring (50) with relatively rigid segments (56) and relatively resilient segments (58) that are integral with one another to circumferentially urge the relatively rigid segments (56) together when the backup ring (50) expands. The backup ring (50) may radially expand to reduce or eliminate a radial gap between the backup ring (50) and a radially inwardly facing surface of a corresponding cased wellbore (22) to prevent or minimize axial extrusion of a corresponding sealing member (32), such as a compressible packer seal of a cased-hole retrievable packer assembly. The relatively resilient segments (58) allow the backup ring (50) to elastically expand and retract to prevent axial extrusion of the sealing member (32). The relatively rigid support segments (54) may be axially aligned with a corresponding relatively resilient segment (58) of the backup ring to prevent axial extrusion of the sealing member (32) through the corresponding relatively resilient segment (58).

Abstract: The present invention relates to the field of enhanced oil recovery and provides a method of establishing a plug in a hydrocarbon reservoir, the method comprising introducing into the reservoir a formulation comprising solid particles and a viscosifier and then reducing the viscosity of said viscosifier, thereby causing said solid particles to form a plug within said hydrocarbon reservoir. Also provided is a method of establishing a plug in a hydrocarbon reservoir, the method comprising introducing into the reservoir a formulation comprising: (a) microorganisms or cell-free enzymes; (b) solid particles; and (c) a viscosifier which is a substrate for the microorganisms or cell-free enzymes of (a). Also provided is a formulation comprising: (a) microorganisms or cell-free enzymes; (b) solid particles made from wood or a wood derived product; and (c) a viscosifier which is a substrate for the microorganisms or cell-free enzymes of (a).

Abstract: A multifunction blowout preventer has a housing formed from a single piece of material, which has a central bore, a bottom connection, a gate valve section, an integrated ram assembly/flow tee section, and a top connection. The blowout preventer optionally includes a gas lift/electrical ports section. The components of the blowout preventer are radially offset and/or staggered from one another about the periphery of the housing to help minimize the height of the blowout preventer.

Abstract: A method for pre-pressurizing fluid control valves is provided. The fluid control valves may be part of a hydraulic fracturing tree, or may be part of a so-called zipper frac manifold. In either instance, the method uses a lubrication unit for pre-pressurizing the cavity of a valve by injecting lubricant under high pressure. A portable lubrication unit is also provided. The lubrication unit is used to pre-pressurize the fluid control valves with lubricant, and to then hold pressure during a hydraulic fracturing operation. Lubricating the control valves restricts scarring by the fracturing fluid of the internal components of the control valve by equalizing pressure.

Abstract: A rupture disc assembly and a float tool incorporating the rupture disc assembly is disclosed. The rupture disc assembly may include a rupture disc assembly comprising a rupture disc, an upper tubular portion and a lower tubular portion, and a securing mechanism for holding the rupture disc between the upper and lower tubular portions. A float tool for creating a buoyant chamber in a casing string may include the rupture disc assembly and a sealing device for sealing the lower end of the casing string, the buoyant, sealed chamber may be created there between. In operation, applied fluid pressure causes the rupture disc to move downward. The rupture disc may be shattered by contact with a surface on the lower tubular portion. Full casing internal diameter may be restored in the region where the rupture disc formerly sealed the casing.

Abstract: A fallback prevention valve apparatus, system and method is described. An electric submersible pump (ESP) fallback prevention system includes an ESP assembly positioned in a downhole well, the ESP assembly including production tubing extending between a centrifugal pump and a surface of the downhole well such that during operation of the ESP assembly production fluid flows upward from the centrifugal pump through the production tubing to the surface, the production tubing including a fallback valve actuatable by the flow of production fluid, the fallback valve actuatable between an open position, wherein production fluid flowing upward through the fallback valve actuates the fallback valve into the open position, and a closed position, wherein production fluid flowing downward through the fallback valve actuates the fallback valve into the closed position, the closed position blocking sand carried by the production fluid from falling into the centrifugal pump.

Abstract: This disclosure provides a completion tool that uses a rolling seal to actuate a flow valve or replace a piston in a down hole tool. The rolling seal is located in a fluid chamber of the completion tool and divides the fluid chamber into first and second smaller fluid chambers and fluidly seals the first smaller fluid chamber from the second smaller fluid chamber. The rolling seal responds to a fluid pressure within the fluid chamber that causes the closed end of the rolling seal to invert thereby transferring fluid pressure between the first and second fluid chambers, which actuates a flow valve actuation assembly.

Abstract: A triggering mechanism for downhole equipment includes a housing for inserting downhole in an oilfield wellbore and associating downhole with a computer processor, a clock, at least one sensor circuit, and an electrical power source. The computer processor includes computer processing circuitry and a computer readable memory circuit. The sensor circuit senses at least a pressure parameter associated with the pressure within the oilfield wellbore downhole environment. A valve control circuit controls a valve and controls flow of control fluid to a hydromechanical device operating in association with the downhole tool within the oilfield wellbore. The valve control commands derive from real-time sampling of the downhole physical parameters to form ratio-based derivative values relating to physical parameter differences over a predetermined time span.

Abstract: An assembly includes a housing of a production tubing including one or more housing ports around a housing circumference of the housing. The assembly also includes a sleeve including one or more sleeve ports around a sleeve circumference of the sleeve. The sleeve is moveable between a closed configuration in which at least a portion of the sleeve is positionable to cover the housing ports of the production tubing and an open configuration in which the sleeve is positionable such that the sleeve ports provide fluid communication between the production tubing and an annulus in a wellbore. Further, the assembly includes a shoulder positioned at an uphole edge of the sleeve to apply an opening force to the sleeve to change the sleeve from the closed configuration to the open configuration.

Abstract: A method for pressure protection of an offshore platform (14, 16) of an oil and gas installation, the offshore platform (14, 16) being connected to source of hydrocarbons via a pipeline (18), the method comprising: using a safe link device (62) at the pipeline (18); wherein the safe link device (62) is located subsea and outside of the safety zone of the platform (14), (17); protecting the platform via a subsea High Integrity Pressure Protection System (HIPPS) for the platform (14, 16) and/or the pipeline (18); and wherein the safe link device (62) is arranged to activate to release pressure from the pipeline (18) when the pressure exceeds a preset threshold that is above the normal ultimate limit state pressure for the platform (14, 16).

Abstract: Slow-rotating tools may operate within a tubular structure such as casing or tubing strings in a wellbore, e.g., to clean an interior surface of the tubular structure or to support other wellbore applications. A slow-rotating tool may include a nozzle assembly that rotates with respect to an end of a coiled tubing strand or other conveyance, and a working fluid delivered through the conveyance may operate to drive rotation of the nozzle assembly. A motor component of the tool may include a coiled conduit that winds and un-winds in response to pressure fluctuations in the working fluid. The coiled conduit may be operably coupled to a pair of directional clutches that harness the rotational motion induced by the winding and unwinding, and impart the rotational motion to the rotatable housing in a single direction.

Abstract: A clean-out tool and method of cleaning out a wellbore. The clean-out tool is placed at the end of a coiled tubing or other conveyance string. The clean-out tool comprises a tubular housing providing an elongated bore through which fluid flows. The tubular housing has back-jetting ports disposed at an upward angle therein. The clean-out tool is configured to operate in a back-jetting mode when the clean-out fluid is pumped into the tubular housing at a first flow rate. In this mode, a portion of clean-out fluid flows through the bore, up an annular region and then through the back jetting ports. The clean-out tool is further configured to operate in a fluid flow-through mode when the clean-out fluids are pumped into the bore of the tubular housing at a second flow rate. In this mode, all of the clean-out fluid flows through the clean-out tool.

Abstract: A battery of shock waves applicators positioned on a support beam having an elliptical or spherical shape in a common device wherein focused shock waves from the applicators combine to provide pseudo-planar waves over a far field distance.

Abstract: A trimming tool suitable for trimming material from within a central opening of an annular seal member includes a tubular member extending along a tool axis, a cutter coupled to move with the tubular member, and a first and a second debris catcher mounted on the tubular member. The cutter includes a first cutting edge oriented to cut when the tubular member is moved in a first direction along the tool axis, and a second cutting edge oriented to cut when the tubular member is moved in a second direction along the tool axis. Each debris catcher includes a receptacle that is open toward the cutter and includes an outer surface with a tapered segment. The cutter is mounted to the tubular member at a position between the first and second debris catchers.

Abstract: A drilling rig system may include a drilling rig including a plurality of surface rig equipment thereon and a plurality of orientation sensors disposed on the plurality of surface rig equipment. The plurality of orientation sensors may be configured to provide relational positioning of the plurality of surface rig equipment on the drilling rig.

Abstract: A method of passive surveying comprises generating one or more detected signals by passively detecting a signal generated within a subsurface earth formation due to a seismoelectric response or an electroseismic response in at least one porous subsurface earth formation containing at least one fluid, and processing the one or more detected signals to determine at least one property of the subsurface earth formation.

Abstract: A method of installing a header pipe joint at a subsea structure is provided, comprising providing a header pipe joint having at least one valve installed therein and connecting the header pipe joint inline of a spool or pipeline prior to lowering the header pipe joint to the subsea structure. The header pipe joint is then lowered to the subsea structure, and the valve is connected to the subsea structure (e.g. a subsea production system of the subsea structure such as a xmas tree) with a connection bridge e.g. a choke bridge. This provides a fluidic connection between the subsea structure and the header pipe joint. The subsea structure comprises a foundation, e.g. suction anchors, which provide support for both a wellhead and the header pipe joint. A subsea assembly comprising a subsea structure, header pipe joint and connection bridge is also provided.

Abstract: The present invention discloses a silty marine natural gas hydrate gravel stimulation mining method and a mining device. The mining method appropriately relaxes the sand retention accuracy of a wellbore, so that the fine sand and muddy components of the stratum can flow into the wellbore, and after a certain period of production, the coarse gravels are injected into the extra-pipe stratum of the production well to fill the deficit caused by the production of the fine components of the stratum and the hydrates, and then the well is opened for production. The method achieves the triple objectives of improving the productivity of the silty reservoir, preventing the large-area deficit in the stratum and extending the effective period of the sand retention of the wellbore, by way of the alternation of the rounds of the gravel injection and the hydrate reservoir fluid extraction.