395 results about "Hydraulic seal" patented technology

This invention relates to an assembly and method for forming a hydraulic seal at the junction of a multilateral well bore drilled through a window in at least a main well bore comprising a tubular member which is run into the well bore casing and has a sealing member positioned about the tubular member for seating, at least one orientation member being provided for orientation of the tubular member and sealing member in the main well bore casing, and having a tubular sleeve member for insertion in the well bore which has an aperture through at least one side of the tubular sleeve member for alignment of the aperture with the window and having a seating surface on the inside of the tubular sleeve member proximate the aperture, with the aperture in some embodiments being adjustable, and having a deflection member positioned and releasable sealed in the tubular sleeve member for deflecting the tubular member through the window in the well bore when the tubular member is run into contact with the deflection member, and having at least one orientation member for orientation of the deflection member relative to the window in the at least well bore casing and for aligning the aperture in the tubular sleeve with the window and a method of using the assembly to form a seal at the junction which can be executed in one run into the well bore casing in at least one embodiment.

Recovery of viscous hydrocarbon from subterranean formations is assisted by using a plurality of novel U-tube type wells, each with dual wellheads, a moveable wellbore packer, a lateral section with a concentric communication zone and with sequential injection production perforations in which heat is injected into the proximal perforations and hot oil and produced fluids are produced from the distal perforations, the whole process being controlled by modulating the production flow where the wellbore fluids are controlled to act as a hydraulic seal to limit bypass of injected fluids. The injection-production displacement process moves axially along the wellbore in a sequential manner as hydrocarbon volumes are depleted by injected fluid displacement of oil and oil and water production.

An expandable downhole tool is disclosed that employs naturally occurring organic matter as the expandable material. The expandable material is located within an enclosure formed in part by an impermeable element, which may form a hydraulic seal, and a permeable membrane that permits fluids present in the wellbore to pass and interact with the organic matter. The heat and fluids present within the wellbore may cause the expandable matter to swell, and thus causing the enclosure to swell and possibly form a hydraulic seal against a wellbore or inner annulus. The expandable tool may be used as packer, plug, or other downhole tool, among others. Methods of manufacturing and using such tools are also disclosed.

A valve for regulating the rate of flow and/or the pressure of oil flowing to a transmission or another consumer in the power train of a motor vehicle has a piston which defines with the valve housing a chamber for one or more springs and for oil being admitted through a first inlet by way of a first conduit containing a first throttle. A second inlet admits pressurized oil from a pump, and such oil can be admitted into the consumer by way of a first outlet and a second conduit containing a second throttle and supplying oil to the first conduit. A second outlet can deliver oil from the second inlet to the sump in response to shifting of the piston. A hydraulic seal is established between the piston and the housing intermediate the chamber and the second outlet to prevent leakage of oil from the chamber into the second outlet. Oil leaking from the chamber could adversely influence the characteristics of oil flowing into the consumer.

A valve apparatus that has a longitudinal axis therethrough comprises a valve seat member, a valve closure member, a fluid flow path, and a resilient valve insert member. The valve seat member comprises a hollow bore and a first frustoconical contact surface that has an inner perimeter and an outer perimeter. The valve closure member comprises a valve body and a second frustoconical contact surface that is adapted to seal against the first frustoconical contact surface in a strike face area. The valve closure member is movable along the longitudinal axis of the valve apparatus. The fluid flow path extends through the bore of the valve seat member and between the valve seat member and the valve closure member. This fluid flow path is closed when the second frustoconical contact surface is sealed against the first frustoconical contact surface. The resilient insert member is attached to the valve closure member. It has an inner perimeter and an outer perimeter, the inner perimeter being adjacent to the strike face area on the second frustoconical surface. The resilient insert member is offset and adapted to contact the first frustoconical contact surface and form a hydraulic seal therewith at the inner perimeter of the insert member, before the first frustoconical contact surface comes in contact with the second frustoconical surface as the valve closes. The offset of the insert member is greater at its outer perimeter than at its inner perimeter, and is greater at its outer perimeter than the diameter of the largest particle in any fluid to be pumped. The insert is deformable but substantially non-compressible and comprises a particle retaining means to accommodate solid particles that are trapped between the insert and the valve seat member when the valve closes. The particle retaining means has at least one cavity (void space) that is in fluid contact with the flow path for fluids between the valve seat member and valve closure member when the valve is open. The cavity has an opening in fluid contact with the flow path for fluids when the valve is open and is large enough to accommodate one or more solid particles within the interior of the cavity. The volume of the cavity contracts as the valve closes, whereby solid particles are screened from the fluid and retained within the cavity, and whereby clear fluid is forced out of the cavity into the flow path and directed inwardly toward the bore of the valve seat member through the gap between the first and second frustoconical contact surfaces.

The invention discloses an energy-saving hydraulic seal experiment table and a method thereof. The experiment table consists of an experimental cylinder, a driving loop of the experimental cylinder and a loading loop, and is characterized in that the experimental cylinder consists of a left cylinder cover, a left guide sleeve, a cylinder barrel, a piston, a piston rod, a right guide sleeve and a right cylinder cover; the driving loop of the experimental cylinder comprises a variable pump, a safety valve, a filter, a solenoid valve, etc; and the loading loop comprises a fixed displacement pump, an overflow valve, a filter, a solenoid valve, an accumulator and a stop valve. The experiment table can conduct experiments on various sealing rings of the piston and the piston rod, carry out online inspection of the sealing performance and the tribological properties of the sealing rings and the manufacturing quality of sealing elements, and perform experiments on a plurality of sealing elements to be detected simultaneously. The experiment table has the advantages of adjustable experiment speed and pressure, and excellent energy-saving effect.

A multilayer annular seal assembly including at least one outer sealing ring including at least one inner annular space and at least one inner sealing ring formed with one or more inner annular chambers.

A brace for augmenting extension of a user's limb about a joint comprises an upper arm pivotably attached to a lower arm. At least one compression element is attached to at least one of the upper and lower arms, and a substantially inelastic tensioning element is affixed to the other of the upper and lower arms over at least one tensioning member. Applying a force to bend the brace to a flexed position loads the compression element, and upon removal of the flexing force the compression element applies a restoring force to urge the brace back to the extended position. The compression element may comprise a hydraulic tension spring comprising at least one cylinder having a sealed portion defining a liquid containment space, and a piston comprising a compressing portion having a smaller diameter than the cylinder and extending axially through a hydraulic seal into the liquid containment space. A guide for maintaining the piston oriented axially relative to the frame maintains piston alignment so that when the frame is fixed in place and tension is applied to the tensioning member, the compressing portion of the piston rod intrudes further into the liquid containment space, compressing the hydraulic fluid and loading the spring.

Recovery of viscous hydrocarbon by hot fluid injection into subterranean formations is assisted by using a specially designed and under-reamed vertical wellbore with multiple injection perforations separated from the production perforations by a moveable packer. In this oil recovery method the operator drills a typical vertical well, in which a cavity is developed below the pay zone by under-reaming the vertical wellbore to form a collection cavity. This under-reaming can be made up to several feet in diameter using standard reaming technology and tools. Steam is injected into the upper perforations and is prevented from bypassing the cold formation by a vertical hydraulic seal developed in an annular communication zone. Hot oil is produced into the lower perforations and is collected in the reamed out production cavity. A producing mechanism including pumping equipment lifts the produced oil from the central cavity to the surface.

A chain tensioner includes a cylindrical cylinder having a closed end, a plunger slidably mounted in the cylinder, and a return spring biasing the plunger. The cylinder is formed with an oil supply passage through which hydraulic oil is introduced into a pressure chamber defined by the plunger and the cylinder. The oil supply passage has an orifice at its end portion facing the pressure chamber. A leak gap is defined between sliding surfaces of the plunger and the cylinder. A damper force is produced by viscous resistance of hydraulic oil flowing from the pressure chamber through the leak gap, and by viscous resistance of hydraulic oil flowing from the pressure chamber into the oil supply passage through the orifice.

The invention relates to a transmission hydraulic system for a transmission with multiple clutches and a control method with hydraulic valves for transmissions comprising multiple clutches which provide improved safety during operation. The transmission has a double clutch device for influencing partial transmission parts, where each transmission part has control elements with two-sided hydraulic controllable switching actuators for moving switching collars. Collar selection valves are attached to the actuators, and flow paths influence the actuators using pressurized oil. One of the actuators is attached to the flow paths and the other actuator is attached to other paths provided in connection with a pressurized oil sump in one position of the valves and vice versa in another position of the valves. An independent claim is also included for a method for shifting gears of a transmission.

The invention provides a double-winding hydraulic control system, which comprises a first winding motor (10), a second winding motor (12), a closed-type hydraulic pump (30) and a main reversing valve (20), wherein the main reversing valve (20) comprises an oil inlet, an oil-returning port, a first working oil port, a second working oil port, a third working oil port and a fourth working oil port, the oil inlet is communicated with the oil-outlet end of the closed-type hydraulic pump (30), the oil-returning port is communicated with the oil-inlet end of the closed-type hydraulic pump (30), the first working oil port and the second working oil port are connected to the two opposite ends of the first winding motor (10), and the third working oil port and the fourth working oil port are connected to the two opposite ends of the second winding motor (12). According to the hydraulic control system disclosed by the invention, the operation of the first winding motor and the second winding motor can be controlled only by the main reversing valve, so as to guarantee that only at most one winding motor rotates at the same time; the hydraulic control system has a simple structure; moreover, because hydraulic oil in a working oil path of a closed-type hydraulic system does not return an oil tank, the efficiency is improved.

The invention provides a rail friendly type anti-yaw oil pressure damper. The rail friendly type anti-yaw oil pressure damper comprises a piston rod end part connecting part, a dustproof cover, a rubber dustproof sleeve, a dustproof ring, an inner cap nut, a framework oil seal, an outer cap nut, a guide bearing end part sealing part, a guide bearing assembly, a guide bearing gas exhaust plate, a pressure cylinder barrel, a piston-piston rod assembly, an oil storage cylinder assembly, hydraulic oil, a bottom valve assembly, a pressure cylinder barrel gasket, a bottom valve gasket, an oil guide plate assembly, a small magnet and an oil return assembly. The two sides of a middle area of the inner wall of the pressure cylinder barrel of the oil pressure damper are equipped with symmetrical bypass damping slots; and when a position, passing through a curve, a bogie and a vehicle body, of a train changes, the oil pressure damper has a damping self-adapting function, and can effectively reduce wheel rail acting force and abrasion. The rail friendly type anti-yaw oil pressure damper avoids the defects that an active control type anti-yaw oil pressure damper system is complex, is poor in reliability and real-time property, is high in manufacturing cost and is difficult to maintain, and also achieves the effects of having a damping coefficient varying function and being safe and reliable. The invention further provides a low damping parameter design method for the rail friendly type anti-yaw oil pressure damper.

The invention discloses a high-abrasion-resistance hydraulic sealing gasket and a preparation method thereof. The high-abrasion-resistance hydraulic sealing gasket is prepared from nitrile-butadiene rubber, ethylene propylene diene monomer, EVA (ethylene-vinyl acetate) resin, epoxy octyl stearate, terpene resin, diphenyl toluene phosphate, organic montmorillonite, modified nano ceramic, cerium oxide, gadolinium oxide, zinc oxide, barium stearate, calcium stearate, titanium white, nano bauxite and other raw materials. By performing organic composite modification with nano aluminum nitride, nano titanium carbide, nano zirconium boride and many types of nano ceramic powder, the compatibility with rubber can be enhanced; and when being used for filling a modified rubber material to prepare the sealing gasket, the modified nano ceramic powder can obviously enhance the heat resistance, abrasion resistance, mechanical strength and other properties of the sealing gasket. The rare-earth metal oxides (cerium oxide and gadolinium oxide) are added to enhance the aging resistance of the rubber.

A borehole formation testing system that measures resistivity of near borehole formation in situ rather than the measuring resistivity of fluid drawn into a formation tester tool. A radially extendable probe assembly contacts and forms a hydraulic seal with the wall of a borehole using a pad. Electrode contacts are disposed on the contact surface of the pad and electrically contact the near borehole formation. Response of the electrode contacts are used to determine resistivity of the near borehole formation. This resistivity is with a deeper formation resistivity measurement to determine if virgin formation fluid is at or in the vicinity of the pad. Alternately, a plurality of resistivity measurements is made at the formation tester pad and virgin formation fluid at or near the pad is determined from the rate of change of the plurality of resistivity measurements.

The invention provides a mixed communication type oil-gas shock attenuation device which comprises a first oil-gas damping device and a second oil-gas damping device which have the same structure, wherein the first oil-gas damping device is composed of a first hydraulic oil cylinder chamber for charging hydraulic oil and a first cylinder chamber for charging inert gas; the first cylinder chamber can be installed on the first hydraulic oil cylinder chamber in a reciprocating manner; and in addition, the lower end of the first cylinder chamber is fixedly connected with a first piston of the first hydraulic oil cylinder chamber. The mixed communication type oil-gas shock attenuation device has a compacter structure, is lower in production cost, can improve the vertical vibration performance of vehicle driving and the riding comfort of a vehicle, also lowers the inherent frequency of a vehicle body, is convenient in regulating the posture of the vehicle, is beneficial to acquiring better anti-roll stiffness and anti-pitching stiffness by a engineering vehicle and thus improving the ride comfort and the driving stability of the vehicle.

The invention discloses a multifunctional impact experiment platform and method capable of continuously applying an axial force. The device comprises seven parts including a rigid support, a fixed end, a sliding end, a sliding assembly, a loading assembly, a hydraulic assembly and a data acquisition assembly and is characterized in that an annular spring is assembled on a jack between the sliding end and the hydraulic assembly; pressure is pre-applied to a test piece through a compression spring; in an impact experiment, the spring is gradually stretched and the axial force is reduced; an axial force gradually weakening process of an axial pressure component is really simulated under an impact or explosion load effect; four inner thread bolt holes are pre-formed in the bottom of the sliding end; after the sliding end is fixedly connected with the rigid support, a failure process of a bent component under an impact load can be simulated; and the multifunctional impact experiment platform and method have the advantages that the whole structure is simple and compact and experiment operation is simple and convenient.