Abstract: A system for locking a bearing assembly to a rotating control device (RCD) housing is provided. The RCD housing can be coupled to a blowout preventer, and the bearing assembly can be received within the housing, and can comprise a stationary bearing housing having a perimeter channel. A plurality of locking block assemblies are each supported by the housing and are operable between a locked position and an unlocked position. Each locking block assembly comprises a movable block configured to interface with the perimeter channel when in the locked position, and at least one elastic component is situated between the housing and the movable block. The at least one elastic component is configured to automatically bias the movable block in the locked position. Upon supplying fluid pressure via a valve device, the movable block moves to the unlocked position and the at least one elastic component compresses to facilitate removal of the bearing assembly from the RCD housing.

Abstract: A rotating control device (RCD) for a drilling operation comprises a housing operable with a blowout preventer, and a bearing assembly operable to be received in the housing, and operable to receive a pipe of a drill string. The RCD comprises a plurality of locking pin assemblies supported by the housing. Each locking pin assembly can comprise a movable pin operable between a locked position that locks the bearing assembly to the housing, and an unlocked position that unlocks the bearing assembly from the housing. An RCD comprises an RCD housing coupled to a blowout preventer, and a bearing assembly received within the RCD housing and comprising a lower sealing element sleeve having a perimeter channel. The system comprises a plurality of locking pin assemblies supported by the RCD housing and operable between a locked position and an unlocked position. The movable pins can be automatically biased to the locked position by elastic elements upon removing fluid pressure from the housing.

Abstract: A packer including a body having a first axial end and a second axial end; an element disposed about the body; a flow passage within the body extending from the first axial end to the second axial end; a first pathway including a first port dimensioned and configured to receive a first penetrator and a second opening having a dimension smaller than the first port, the first port being located at the first axial end of the body and the second opening being located at the second axial end of the body; and a second pathway including a second port dimensioned and configured to receive a second penetrator and a first opening having a dimension smaller than the second port, the second port being located at the second axial end of the body and the first opening being located at the first axial end of the body.

Abstract: A method includes fitting an elastomeric component about a perimeter surface of a tool that includes a longitudinal axis, the elastomeric component including carbon-based nanoplatelets in an elastomeric matrix; and tripping the tool into a bore in a geologic formation.

Abstract: The present invention relates to an annular barrier system for completing a well with a well tubular metal structure, comprising the well tubular metal structure comprising a first annular barrier and a second annular barrier, each annular barrier being introduced and set in the well to abut a wall of the well providing a confined space having a confined pressure between the wall, part of the well tubular metal structure, the first annular barrier and the second annular barrier, so that the first annular barrier isolates the confined space from a first annulus having a first pressure and the second annular barrier isolates the confined space from a second annulus having a second pressure, wherein the annular barrier system comprises a pressure equalising unit having a first position in which the first annulus is in fluid communication with the confined space and a second position in which the second annulus is in fluid communication with the confined space, in the first position the second pressure is higher

Abstract: A downhole tool suitable for use in a wellbore, the tool having a mandrel configured with a mandrel end having a failure point defined by an inner groove and a failure point wall thickness. The downhole tool also has a first slip disposed about the mandrel; a second slip disposed about the mandrel; and a lower sleeve disposed about the mandrel proximate to the second slip. The lower sleeve is engaged with the mandrel.

Abstract: A resettable bridge plug that is configured to isolate a section of a wellbore. The resettable bridge may be utilized in fracturing a wellbore, wherein the same bridge plug may be set and released at different locations for multiple cycles with a wireline run.

Abstract: Provided are systems and methods for thru-tubing completion including a sub-surface completion unit (SCU) system including a SCU wireless transceiver for communicating with a surface control system of a well by way of wireless communication with a down-hole wireless transceiver disposed in a wellbore of the well, one or more SCU anchoring seals having an un-deployed position (enabling the SCU to pass through production tubing disposed in the wellbore of the well) and a deployed position (to seal against a wall of the target zone of the open-hole portion of the wellbore to provide zonal isolation between adjacent regions in the wellbore) and one or more SCU centralizers having an un-deployed position (enabling the SCU to pass through the production tubing disposed in the wellbore of the well) and a deployed position (to position the SCU in the target zone of the open-hole portion of the wellbore).

Abstract: Provided are systems and methods for thru-tubing completion including a sub-surface completion unit (SCU) system including a SCU wireless transceiver for communicating with a surface control system of a well by way of wireless communication with a down-hole wireless transceiver disposed in a wellbore of the well, one or more SCU anchoring seals having an un-deployed position (enabling the SCU to pass through production tubing disposed in the wellbore of the well) and a deployed position (to seal against a wall of the target zone of the open-hole portion of the wellbore to provide zonal isolation between adjacent regions in the wellbore) and one or more SCU centralizers having an un-deployed position (enabling the SCU to pass through the production tubing disposed in the wellbore of the well) and a deployed position (to position the SCU in the target zone of the open-hole portion of the wellbore).

Abstract: Provided are systems and methods for thru-tubing completion including a sub-surface completion unit (SCU) system including a SCU wireless transceiver for communicating with a surface control system of a well by way of wireless communication with a down-hole wireless transceiver disposed in a wellbore of the well, one or more SCU anchoring seals having an un-deployed position (enabling the SCU to pass through production tubing disposed in the wellbore of the well) and a deployed position (to seal against a wall of the target zone of the open-hole portion of the wellbore to provide zonal isolation between adjacent regions in the wellbore) and one or more SCU centralizers having an un-deployed position (enabling the SCU to pass through the production tubing disposed in the wellbore of the well) and a deployed position (to position the SCU in the target zone of the open-hole portion of the wellbore).

Abstract: Provided are systems and methods for thru-tubing completion including a sub-surface completion unit (SCU) system including a SCU wireless transceiver for communicating with a surface control system of a well by way of wireless communication with a down-hole wireless transceiver disposed in a wellbore of the well, one or more SCU anchoring seals having an un-deployed position (enabling the SCU to pass through production tubing disposed in the wellbore of the well) and a deployed position (to seal against a wall of the target zone of the open-hole portion of the wellbore to provide zonal isolation between adjacent regions in the wellbore) and one or more SCU centralizers having an un-deployed position (enabling the SCU to pass through the production tubing disposed in the wellbore of the well) and a deployed position (to position the SCU in the target zone of the open-hole portion of the wellbore).

Abstract: Provided are systems and methods for thru-tubing completion including a sub-surface completion unit (SCU) system including a SCU wireless transceiver for communicating with a surface control system of a well by way of wireless communication with a down-hole wireless transceiver disposed in a wellbore of the well, one or more SCU anchoring seals having an un-deployed position (enabling the SCU to pass through production tubing disposed in the wellbore of the well) and a deployed position (to seal against a wall of the target zone of the open-hole portion of the wellbore to provide zonal isolation between adjacent regions in the wellbore) and one or more SCU centralizers having an un-deployed position (enabling the SCU to pass through the production tubing disposed in the wellbore of the well) and a deployed position (to position the SCU in the target zone of the open-hole portion of the wellbore).

Abstract: Provided are systems and methods for thru-tubing completion including a sub-surface completion unit (SCU) system including a SCU wireless transceiver for communicating with a surface control system of a well by way of wireless communication with a down-hole wireless transceiver disposed in a wellbore of the well, one or more SCU anchoring seals having an un-deployed position (enabling the SCU to pass through production tubing disposed in the wellbore of the well) and a deployed position (to seal against a wall of the target zone of the open-hole portion of the wellbore to provide zonal isolation between adjacent regions in the wellbore) and one or more SCU centralizers having an un-deployed position (enabling the SCU to pass through the production tubing disposed in the wellbore of the well) and a deployed position (to position the SCU in the target zone of the open-hole portion of the wellbore).

Abstract: A spring biased device having a plurality of operational spring rates including a housing; a first spring disposed between a selective support and a functional component; a second spring disposed between the selective support and another support; and a releasable connection between the selective support and the housing. A valve including a housing; a seat disposed within the housing; poppet movable to a position on the seat and a position off the seat, the poppet having a valve stem; a selective support; another support attached to the housing, the selective support and the another support allowing through passage of the valve stem; a first spring disposed between the selective support and the poppet; a second spring disposed between the another support and the selective support; and a connection between the selective support and the housing, the connection being selectively defeatible.

Abstract: A bottom hole actuator tool for locating and actuating one or more sleeve valves spaced along a completion string. A shifting tool includes radially extending dogs at ends of radially controllable, and circumferentially spaced support arms. Conveyance tubing actuated shifting of an activation mandrel, indexed by a J-Slot, cams the arms radially inward to overcome the biasing for in and out of hole movement, and for releasing the arms for sleeve locating and sleeve profile engagement. A cone, movable with the mandrel engages the dogs for positive locking of the dogs in the profile for sleeve opening and closing. A treatment isolation packer can be actuated with cone engagement. The positive engagement and compact axial components results in short sleeve valves.

Abstract: The present disclosure provides a method of perforating a wellbore, the method comprising the steps of: (a) lowering a perforating wellbore tool into the wellbore proximate a formation to be perforated, (b) anchoring the perforating wellbore tool by setting an anchoring tool, (c) perforating the formation, (d) creating a low pressure chamber in the perforating wellbore tool, and (e) unsetting the anchoring tool after a time delay.

Abstract: A system and a method for distributing electric power from a power source of electricity to power fracturing operations includes a plurality of circuit breakers, each circuit breaker including a first circuit breaker connector and a second circuit breaker connector, each of which outputs electric power to a corresponding transport at a first voltage level, a power source connector that receives electric power from a power source of electricity at the first voltage level, and a black start generator that generates electric power at a second voltage level and that supplies the generated electric power to start the power source of electricity.

Abstract: A method transports and installs a heavy subsea structure such as a subsea processing center for produced crude oil or natural gas. The method includes controlledly flooding at least one ballast tank attached to or incorporated into the structure to the extent that the structure becomes negatively buoyant at a pre-determined towing depth. The method also includes towing the negatively-buoyant structure at the towing depth by the Controlled Depth Towing Method (CDTM). After towing to the installation location, the method includes further flooding the ballast tank to lower the structure onto the seabed. At the seabed, a fluid transportation pipe of a subsea production installation may be coupled to pipework of the structure.

Abstract: The invention relates to a method of conducting a perf wash cement (“P/W/C”) abandonment job in an offshore oil or gas well annulus (2), in particular the washing or cementing operation using a rotating head (6, 8) with nozzles (7, 9) dispensing wash fluid or cement at pressure. Certain values of parameters of a washing or cementing job have been found surprisingly to affect the quality of the job, or the degree to which they affect the quality of the job has been unexpected. These include including rotation rate of the tool, the direction of translational movement of the tool, and the volume flow rate and pressure per nozzle of cement or wash fluid (and hence nozzle size).

Abstract: The provided method allows optimizing the fracturing design (frac design) while taking into account the two-dimensional modelling of the transport processes in the fracture. The generation of the fracturing design in a well comprises the steps of: obtaining data on hydraulic fracturing including the proppant pumping schedule and the fibre pumping schedule for various types of fibres; generating a degradation matrix for the various types of fibres; generating possible options of the hydraulic fracturing operation according to the fibre type and pumping schedule. Moreover, the method of hydraulic fracturing, which comprises generating a schedule of fracturing in a well, preparing a fracturing fluid containing carrier fluid, proppant, additives, and fibres, and pumping the fracturing fluid into the formation through the well following the selected (optimal) option of the fracturing operation, is provided.

Abstract: A method and apparatus for generating a fluid saturation model for a subsurface region. One example method generally includes obtaining a model of the subsurface region; for each of a plurality of fluid types: flooding the subsurface region model with the fluid type to generate a flood model; and running a trial petrophysical inversion with the flood model to generate a trial petrophysical model; identifying potential fluid contact regions in the trial petrophysical models; partitioning the subsurface region model at the identified potential fluid contact regions; and constructing the fluid saturation model from the partitioned subsurface region model.

Abstract: Disclosed is a device for solid-state fluidized mining of natural gas hydrates in a shallow seabed, including: a sea surface support system, a pipeline delivery system, and an undersea drilling system. The sea surface support system includes a hydrate drilling vessel floating on seawater. The pipeline delivery system includes a continuous double-layer oil pipe, a recyclable conduit installed in a sediment cover, an open-hole steering packer installed outside the recyclable conduit. The undersea drilling system includes a hydrate slurry separator, a single screw pump, a hydraulic motor, a jet head and a differential pressure sliding sleeve close to the hydrate drill bit. The present invention has the following beneficial effects. The device achieves a multi-directionally horizontal drilling and production in the hydrate reservoir with a single well head, improving the drilling efficiency and single well production.

Abstract: A well cellar assembly, and a method of using same, with the well cellar including a base plate, the base plate having at least two well slot openings therein for receiving a conductor pipe, and at least one vertically extending side wall connected to the base plate with a fluid tight seal. The at least two well slot openings provide alternative locations for the conductor pipe and at least one of the at least two well slot openings is selected for placement of the conductor pipe.

Abstract: A method for deploying a sand screen in a borehole penetrating the earth includes: disposing the sand screen in an unexpanded form in the borehole, the sand screen at least partially surrounding a base-pipe; and activating the sand screen in the unexpanded form by applying at least one of an activation fluid and heat to the sand screen causing the sand screen to expand into an expanded form. The method further includes: conveying a downhole tool through the base-pipe, the downhole tool being configured to sense a property derived from at least one of expansion and non-expansion of the sand screen as a function of distance into the borehole to provide sensed data as a function of distance into the borehole; and identifying one of an expanded state and an unexpanded state of the sand screen using the sensed data as a function of distance into the borehole.

Abstract: An isolation device and assembly for isolating a production casing in a hydraulic fracturing process includes a hemispheric or tapered first end and a cylindrical second end. The isolation device is constructed of a dissolvable material. The hemispheric or tapered first end seats in a plug to effect the isolation.

Abstract: Electrically ignitable and electrically controllable explosive material (EIECEM) may be disposed within a shaped charge for deployment downhole. An explosion of the EIECEM is controlled by limiting the duration of excitation at the EIECEM, for example, the duration that an electrical source provides an electrical charge, electrical current or electrical signal. The shaped charge may be insulated from an electrical source to prevent explosion of the EIECEM and coupled to the electrical source to create ignite or explode the EIECEM. A plurality of shaped charges may be disposed downhole and may be ignited or exploded in any suitable order. The EIECEM may be ignited multiple times such that multiple explosions are created. The explosion of the EIECEM creates or extends a perforation or fracture in a formation. The shaped charges may be excited in a predetermined sequence and for a predetermined duration of time.

Abstract: A monitoring system can include a position sensor coupled to a pump to sense a position of a rotating assembly member of the pump and generate an associated position signal. The position signal can be used to determine a position of a displacement member in a chamber in a fluid end of the pump. The monitoring system can include a strain gauge to measure strain in the chamber and generate an associated strain signal. The strain signal can be used to determine an actuation point for a valve in the chamber. A computing device can determine an actuation delay of the valve by correlating the position of the displacement member in the chamber with the actuation point for the valve. The actuation delay can represent the actuation point relative to the position of the displacement member during operation of the pump.

Abstract: A fluid distribution system for a wellsite. The fluid distribution system may include a remote controller, a remote pump fluidly coupled to the first piece of wellsite equipment, and a remote fluid tank fluidly coupled to the remote pump. The first piece of wellsite equipment may include a local fluid tank comprising a fluid level sensor, a fill valve fluidly coupled to the local fluid tank, and a local controller configured to actuate the fill valve in response to a fluid level of the local fluid tank and to transmit at least one of a fill valve position or the fluid level of the local fluid tank to the remote controller. The remote controller may be configured to start and stop the remote pump in response to the transmissions from the local controllers.

Abstract: A high-power microwave borehole fracturing device for an engineering rock mass includes a high-power microwave generator, a high-power microwave coaxial heater, a high-power low-loss microwave coaxial transmission line, and a microwave power adaptive regulation and control system. The high-power microwave generator includes a continuous wave magnetron, a permanent magnet, a waveguide excitation chamber, a coaxial circulator, a coaxial matching load, a coaxial coupling converter, a waveguide coaxial converter, and an output waveguide. The high-power microwave coaxial heater includes a microwave transmission inner conductor, a microwave transmission outer conductor, a microwave input connector, a microwave short circuit cap, and a conductor supporting cylinder. The high-power low-loss microwave coaxial transmission line includes an input end coaxial line, middle section coaxial lines, and an output end coaxial line.

Abstract: Systems and methods for avoiding geological formation boundaries during drilling operations by identifying and intuitively displaying the uncertainty of geological formation boundaries relative to an entire well-path.

Abstract: The disclosure relates to a method for performing a drilling operation in a subterranean formation of a field. The method includes obtaining, prior to the drilling operation, a target well data set specifying a target well to be drilled, selecting, from a set of existing wells, a number of analog wells that satisfy a pre-determined similarity criterion with respect to the target well, generating, from a number of analog well data sets of the analog wells, a training data set for the target well, where the training data set includes a rate-of-penetration (ROP) profile for each analog well, generating, using a machine-learning algorithm and based on the training data set, a drilling model that predicts the ROP profile of the target well, and performing, based on the drilling model, modeling of the drilling operation to generate a predicted ROP profile of the target well.

Abstract: A drilling optimization method including perturbing one or more drilling control parameters with a periodic or a stochastic signal during a drilling process, estimating at least one drilling performance measure to optimize the drilling process based on the perturbed one or more drilling control parameters, perturbing the at least one drilling performance measure with a periodic or a stochastic perturbation source through demodulation, determine a next best estimate of the one or more drilling control parameters to optimize the at least one drilling performance measure, perturbing the next best estimate by a periodic or a stochastic perturbation source through modulation, and feeding the perturbation next best estimates of the one or more drilling control parameters back to the drilling process.

Abstract: A central maintenance apparatus of sensor for geophysical exploration includes a body part cylindrically formed to wrap a circumference of a sensor rod; and a plurality of wing parts lengthwise formed at an outer wall of the body part in a convex, semi-elliptic shape with a predetermined width, and formed therein with a cavity, wherein the wing part is formed with a plurality of through holes passing through the cavity from an outside, and has a shape-changing elasticity when a pressure is applied to a direction of the body part. At this time, when an obstacle is encountered while moving inside a borehole, the wing part having a shape-changing elasticity can avoid the obstacle like sliding off the obstacle to allow the central maintenance apparatus of sensor to automatically rotate.

Abstract: A well advisor system and console for monitoring and managing pressure testing operations at a well site. The system may be accessed through one or more workstations, or other computing devices, which may be located at a well site or remotely. The system is in communication with and receives input from various sensors. It collects real-time sensor data sampled during operations at the well site. The system processes the data, and provides nearly instantaneous numerical and visual feedback through a variety of graphical user interfaces (“GUIs”), which are presented in the form of an operation-specific console. The input and data provides information related to pressure testing at a well site.

Abstract: A measurement while drilling system for a drill string having a fluidic medium in the drill string. The measurement while drilling system includes a first module situated at a distal end of the drill string and including a downhole processor and a pulser communicatively coupled to the downhole processor and configured to provide a pressure pulse in the fluidic medium, and a second module situated at a proximal end of the drill string and including an uphole processor and a pressure sensor communicatively coupled to the uphole processor. The downhole processor is configured to direct the pulser to provide the pressure pulse and the pressure sensor is configured to sense the pressure pulse. The uphole processor is configured to receive signals from the pressure sensor to determine a distance from the first module to the second module.

Abstract: Systems and methods for avoiding discrete 3D geological bodies that are hazards to drilling operations by identifying each 3D geological body near a well-path, defining the extents of each 3D geological body relative to the well-path, and displaying the extents of each 3D geological body relative to the well-path.

Abstract: A mobile canopy (or rapid advance shield) for use in a tunnel, comprising: first and second opposing and spaced walls; a curved roof coupled between the first and second walls; first and second skis mounted to respective bottoms of the first and second walls, the skis adapted to slide the mobile canopy about a floor of the tunnel; wherein the curved roof slopes downward from a front end of the mobile canopy toward a back end of the mobile canopy, the front end of the mobile canopy for positioning adjacent to a face of the tunnel; wherein the curved roof is movable between a first position proximate a tunnel roof and a second position spaced from the tunnel roof; and, wherein the first and second walls are movable between respective first positions proximate respective tunnel walls and respective second positions spaced from the tunnel walls.

Abstract: The present invention discloses a combined automatic anti-explosion method for a gas drainage pipeline, comprising specific steps of: preparation of an anti-explosion installation piping; connection of the installation piping and the gas drainage pipeline; assembly of a porous foam material and an automatic control valve; installation of an automatic powder-spraying device and a signal analyzer; installation of a temperature sensor and a pressure sensor; and signal processing and automatic anti-explosion. According to the present invention, the porous foam material is located in a bottom groove of an arched pipeline when no gas explosion occurs in the gas drainage pipeline, without affecting the extraction effect of the gas drainage pipeline.

Abstract: A method for mining an ultra-thick coal seam by utilizing a goaf solid backfilling technique is suitable for mining an ultra-thick coal seam having a thickness of 25 m-45 m. According to the method, the ultra-thick coal seam is sliced into three slices, i.e. an upper slice, a middle slice and a lower slice. First, the middle slice is subjected to solid backfilling and mining. Metal meshes are paved along a working face of the floor. The backfilling layer serves as an artificial floor for mining the upper slice and an artificial roof for mining the lower slice. Then, the upper slice is mined by the top coal caving mining based on the artificial floor formed by backfilling the goaf of the middle slice. Finally, the lower slice is mined by the top coal caving mining along the coal seam floor with the shield of the artificial roof.

Abstract: Provided is a method of forming a roadway by filling gangue paste during wide roadway excavation of a thick coal seam belonging to the technical field of mining industry. The method comprises: firstly designing a width of a filing strip and a width of a new excavation roadway according to a geological condition of a coal seam; secondly, determining a length of each filling, i.e.

Abstract: An inclined shaft continuous feeding system for solid backfilling materials includes a surface loading system, an inclined shaft transportation system, and a downhole unloading system. The inclined shaft transportation system is arranged between the surface loading system and the underground unloading system. The inclined shaft transportation system includes a bottom unloading dumper, support guide wheels, a guide rail, a drive wheel, a reverse wheel, and a traction steel wire rope configured between the drive wheel and the reverse wheel. The present invention can realize a steady, continuous and efficient transportation of the solid backfilling materials from the surface to down hole. Moreover, the material transportation system does not wear easily, has long service life and low material transportation cost.

Abstract: The present invention relates to a method and apparatus for operating an engine having a cylinder and a piston reciprocable therein on compressed gas. The apparatus comprises a source of compressed gas connected to a distributor which distributes the compressed gas to the cylinder. A valve is provided to selectively admit compressed gas to the cylinder when the piston is in an approximately top dead center position. Compressed gas is provided by a compressor comprising a axial compressor, a deflector blade which is located downstream of the axial compressor, a radial compressor which is located downstream of the deflector blade and a housing with a which encloses the axial compressor, deflector blade, and radial compressor.

Abstract: A near-adiabatic engine has four stages in a cycle: a means of near adiabatically expanding the working fluid during the downstroke (expansion stroke); a means of cooling the working fluid at Bottom Dead Center (BDC); a means of near adiabatically compressing that cooled fluid from the lower pressure/temperature level at BDC to the higher level at Top Dead Center (TDC); and finally, a means of passing that working fluid back into the high pressure/temperature source in a balanced condition with minimal resistance to that flow.

Abstract: A steam turbine includes: a rotor; a casing; a thrust bearing; a steam inlet; a first pipe; a first regulation valve; a second pipe; a second regulation valve; and a control device. The control device estimates an exhaust flow rate of the steam turbine based on an operating point map which derives the exhaust flow rate of the steam turbine from an operating point of the steam turbine and estimates the thrust force applied to the thrust bearing based on the exhaust flow rate.

Abstract: Provided is a method for sealing an annular gap in a turbine with a housing and a rotor, in which method a) an annular recess, which is arranged coaxially with respect to the rotor and opposite the tips of the rotor blades of a stage, is provided in the housing or in at least one element attached to the housing, b) a subdivided insert ring, which is formed such that it can be inserted into the recess in a form-fitting manner with play, is provided, c) the insert ring is inserted into the recess, more particularly in that the insert ring is pushed into the recess at least substantially in the axial direction, and d) the insert ring is fixed using securing elements in such a way that an at least substantially axially directed clamping force is applied by means of the securing elements. A turbine is also provided.

Abstract: A spigot joint between two rotating components of a gas turbine engine comprises a male portion engaged with a female portion. The male portion has a radially outer finger spring-loaded against a surrounding surface of the female portion, and a radially inner finger spaced from the radially outer finger by a gap.

Abstract: A movable ring assembly (4) for a turbine engine turbine (10) that is mounted between two successive rotor discs (20a) and (20b) of said turbine (10), said rotor discs (20a) and (20b) being fixed to each other by bolting, characterised in that it comprises:—a fixing ferrule (44) fixed between the upstream (20a) and downstream (20b) discs by the bolting thereof; a part forming a movable ring (42), said part supporting radial sealing members (32) and being fixed between the upstream disc (20a) and the ferrule (44);—and a seal (46) interposed between said part forming the movable ring (42) and the ferrule (44).

Abstract: A propeller fan includes a shaft disposed on a rotation axis and a blade disposed adjacent to an outer circumferential surface of the shaft. The blade has a leading edge and a trailing edge. At least one of the leading edge and the trailing edge has a notch. The notch includes a pair of side edge-parts forming an acute included angle and bottom edge-part located between the pair of side edge-parts. The bottom edge-part includes at least one protrusion having an obtuse included angle.

Abstract: A turbine blade configured to be coupled to a rotational shaft and rotated around an axis includes: a hub having a hub surface which is inclined with respect to the axis in a cross section along the axis; a rotor blade disposed on the hub surface; and at least one rib formed on a blade surface of the rotor blade, the at least one rib extending in a direction which intersects with a span direction of the rotor blade in a meridional plane of the rotor blade.

Abstract: A heat dissipation fan including a hub and a plurality of fan assemblies are provided. The fan assemblies are disposed around the hub, and each of the fan assemblies includes at least two blades. A runner is formed between the at least two blades. A width of the runner gradually reduces along a rotating axis of the hub.