582 results about "Upper joint" patented technology

The invention discloses a high-temperature-resistant and high-pressure-resistant autonomous deep well pressure maintaining sampler, and belongs to the technical field of drilling engineering sampling. The sampler comprises an upper joint, a control outer pipe, an end cover, a valve body and a liquid storage chamber which are connected in sequence, an electromagnet is arranged on the outer side of the end cover; an electric control module is arranged in the control outer pipe; a valve element with a permanent magnet is arranged in the valve body in a sliding mode, the valve element is driven to move axially through non-contact electromagnetic force between the electromagnet and the permanent magnet, and opening and closing of the sampling flow channel are achieved. The bottom of the valve core is provided with a valve core inner channel communicated with the sampling flow channel and the liquid storage chamber and a one-way valve; a sampling inlet channel is formed in the joint of the end cover and the valve body. According to the invention, a pure mechanical sealing-based structure is adopted, so that the sealing reliability and the operation stability in a high-temperature and high-pressure environment of a deep well are remarkably improved, drilling fluid is not needed, and efficient and pressure-maintaining sampling of in-situ formation fluid is realized.

The invention discloses an oil exploitation packer with an expanding type sealing structure, which belongs to the field of oil field downhole tools and comprises a central tube, an upper joint and a lower joint are respectively arranged at two ends of the central tube, a sealing component and a setting component are sequentially sleeved between the upper joint and the lower joint, and the upper joint and the lower joint are connected with a centralizing component and a reversing component in a matched manner. The sealing assembly comprises an installation pipe sleeved on the central pipe and a rubber sleeve sleeved on the outer side of the installation pipe, a first sliding rod and a second sliding rod which are alternately distributed and linked are arranged on the installation pipe in a sliding mode, and a first pushing block and a second pushing block are respectively hinged on the two sliding rods. When the two sliding rods move towards the setting assembly, the first pushing block and the second pushing block alternately penetrate and are spliced into a sealing ring with the outer diameter larger than the inner diameter of the rubber sleeve. The installation pipe provides a stable installation foundation for all the components, sliding rod linkage ensures that the pushing blocks move coordinately and synchronously, the sealing ring extrudes the rubber barrel to enable the rubber barrel to be expanded to be attached to the well wall to achieve sealing, and formation fluid channeling is effectively prevented. And by adjusting the radian of the push block and the length of the push rod, rapid sealing can be achieved under short-distance movement, and sealing reliability and response efficiency are improved.

The invention relates to the technical field of oil exploitation, in particular to a small casing gravel packing sand prevention tool and a using method. According to the technical scheme, liquid through holes are distributed in the outer wall of an outer pipe, a winding wire is wound on the outer wall, one or more supporting ribs are arranged between the winding wire and the outer wall of the outer pipe, and the lower end of the outer pipe is connected with a screen pipe through a lower connector; a cylinder sleeve is mounted at the upper end of the inner pipe, the upper end of the cylinder sleeve is connected with an upper joint, and the lower end of the inner pipe is connected with a washing pipe through an inner lower joint; a plurality of well washing holes are formed in the upper portion of the inner pipe, a piston and a spring are arranged between the cylinder sleeve and the outside of the well washing holes of the inner pipe, and a plurality of circulating well washing holes are formed in the cylinder sleeve. The outer wall of the upper connector is connected with the inner wall of the upper portion of the outer pipe through a locking block and a shear pin. The filling sand prevention device has the advantages that filling sand prevention of a large-displacement and high-sand-ratio stratum with the small inner diameter of a sleeve and the limited internal space of a filling tool can be achieved, filling is conducted through an oil sleeve annulus, the circulation area is larger, and in addition, the filling sand prevention device is simpler in structure and safer and more convenient to construct.

The invention relates to the technical field of water distributors, in particular to an underground water distributor for oil exploitation, which comprises a main pipeline, two ends of the main pipeline are fixedly connected with an upper joint and a lower joint respectively, the main pipeline is slidably connected with an opening valve, a return spring is arranged between the opening valve and the upper joint, the opening valve is in contact with the lower joint, and the main pipeline is provided with a water distribution core. A first sliding block is connected to the water nozzle in a sliding mode, valve plates are arranged on the two sides of the water nozzle, the first sliding block can slide along with changes of pressure and drive the valve plates on the two sides to move, the opening size of the water nozzle can be controlled through movement of the valve plates, and therefore the water nozzle can be conveniently adjusted; when the size of the water nozzle on a certain layer is actively adjusted, the sizes of the water nozzles on other layers can be automatically adjusted according to the water flow pressure change, so that the water nozzles on other layers are prevented from being respectively tested and adjusted when the water nozzles of the water distributor on a certain layer are adjusted, and the working efficiency is improved.

A liquid-cooling heat dissipation structure having a nonlinear fin array. The liquid-cooling heat dissipation structure includes an upper plate, a lower plate, and a flow guide member. The upper plate has an accommodating groove of which an inner side has an upper joint area formed thereon. The lower plate has a lower joint area. The flow guide member disposed between the upper plate and the lower plate includes a heat dissipation plate body having a first surface and a second surface, and a plurality of heat dissipation columns integrally disposed on the second surface. The upper brazing area is connected to the lower brazing area, and two ends of the flow guide member are respectively connected to the upper joint area and the lower joint area to form an enclosed cavity for accommodating the heat dissipation columns.

The invention discloses a self-setting packer and belongs to the technical field of petrochemical engineering. The device comprises an upper connector and a lower connector, a lifting sleeve is installed in an inner hole of the upper connector, and the lower end of the upper connector is connected with an upper pressing ring through a deblocking shear pin; a rubber cylinder shaft is fixedly mounted on the outer side of the lifting sleeve, and a balance piston, a sealing sleeve, an upper pressing ring, a rubber cylinder and a sealing push cylinder are sequentially arranged on the rubber cylinder shaft in a sleeving manner from inside to outside; the lower end of the rubber sleeve shaft is connected with a central pipe through a locking sleeve; the lower end of the central pipe is in threaded connection with a lower joint; the sealing push cylinder sleeves the outer side of the central pipe, and the inner wall of the upper part of the sealing push cylinder is in sealing fit with the outer wall of the locking sleeve to form a primary vacuum piston cavity; the lower end of the sealing push cylinder is in threaded connection with a lower-stage piston, and a starting piston is installed on the outer side of the lower-stage piston in a limited mode through a shoulder. The packer can directly seat a well mouth after descending into a well in place along with a tubular column, pressing is not needed, the tubular column does not need to be lifted and put down, and automatic setting of the packer is achieved through timing liquid inlet and liquid column static pressure.

The utility model discloses a lower limb of a robot, which belongs to the field of robots and can improve the moving stability of the robot and enable the robot to be easier to fall down by arranging an auxiliary leg component 4 outside a thigh component 2 and a shank component 3, and can overcome the defects in the prior art. The robot lower limb comprises a thigh mounting seat 1, two thigh assemblies 2, two shank assemblies 3 and at least one auxiliary leg assembly 4, the thigh assembly 2 comprises a thigh main body 21 and a thigh driving unit 22; the shank assembly 3 comprises a shank main body 31, a shank driving unit 32 and a shank moving unit 33; the auxiliary leg assembly 4 comprises an auxiliary leg main body 41, an auxiliary leg driving unit 42 and an auxiliary leg moving unit 43, an upper joint of the auxiliary leg main body 41 is installed on the thigh main body 21, the auxiliary leg moving unit 43 is arranged on a lower joint of the auxiliary leg main body 41, and the auxiliary leg driving unit 42 is installed on the thigh main body 21 and used for assisting the leg main body 41 to move around the thigh main body 21.

The utility model relates to the field of hydraulic tensile shearing test fixture, disclose a V type notch hydraulic tensile shearing fixture, including upper clamping concrete, sample and lower clamping concrete, the upper clamping concrete and lower clamping concrete upside down both ends are fixed with the handle at the edge, the upper clamping concrete and lower clamping concrete opposite side fixedly set up with the jack, the lower clamping concrete front end fixedly set up with the centring block, the upper clamping concrete front end fixedly set up with the upper joint, the lower clamping concrete rear end fixedly set up with the lower joint, the upper joint and lower joint outside all are threadedly equipped with lock nuts. In the utility model, through optimization design and stable clamping system, the fixture significantly reduces the skidding phenomenon in the test, ensures the accuracy of test result, effectively improves the consistency of test result, simultaneously, the simple operation design of fixture not only shortens the preparation time, but also improves the test efficiency, reduces the working strength of operating personnel.

The utility model relates to a tower crane holding tile connecting structure, and belongs to the technical field of tower cranes. Comprising a standard knot lower joint, a standard knot upper joint, a holding tile I and a holding tile II, a hinge I is arranged on the standard knot lower joint, a hinge II is arranged on the holding tile I, a hinge III is arranged on the holding tile II, and the hinge II and the hinge III are connected with the hinge I through connecting rods. The holding tile I and the holding tile II are fixedly connected with the standard knot lower connector and the standard knot upper connector through bolts. The standard knot lower joint and the standard knot upper joint are provided with grooves matched with the holding tile I and the holding tile II, and the holding tile I and the holding tile II can be clamped into the standard knot lower joint and the standard knot upper joint through the grooves. The utility model has the beneficial effects that the traditional tower body standard knot mounting method is eliminated, the holding tile is initially mounted to the outer side of the lower joint, frequent mounting and dismounting are not needed, and the mounting efficiency is improved. And the hinge design is adopted, so that the holding tiles can be rotationally opened and closed, the flexibility is higher, and the application range is wider.

The application discloses a mechanical drill bit rotary steering vertical drilling tool and relates to the technical field of geological drilling. The mechanical drill bit rotary steering vertical drilling tool comprises an upper joint, an outer cylinder, a steering drill bit body, a flow distribution component and a pendulum control system. The pendulum control system comprises a pendulum mounting component, a pendulum ball hinge, a pendulum middle cylinder and a pendulum end head. The pendulum ball hinge, the pendulum middle cylinder and the pendulum end head can rotate relative to the pendulum mounting component. A plurality of drill bit nozzles are uniformly and sequentially arranged on the steering drill bit body in a circumferential direction. Each drill bit nozzle penetrates through upper and lower ends of the steering drill bit body. A plurality of edge flow distribution holes, which penetrate through upper and lower ends of the flow distribution component, are uniformly and sequentially arranged on an outer edge of the flow distribution component in a circumferential direction. A plurality of central inclined holes, which penetrate through upper and lower ends of the flow distribution component, are uniformly and sequentially arranged on an upper end of a middle part of the flow distribution component in a circumferential direction. A central flow passage, which penetrates through upper and lower ends of the pendulum end head, is arranged on a middle part of the pendulum end head. The mechanical drill bit rotary steering vertical drilling tool is not prone to failure in a complex and changeable downhole environment, has high reliability and low cost.

The utility model discloses a subsurface safety valve piston dynamic sealing detection device, comprising an upper joint, a lower joint, a piston motion assembly, a piston dynamic sealing assembly and a guide assembly, the piston motion assembly is arranged on the upper joint, and the piston dynamic sealing assembly is sleeved on the piston motion assembly and forms dynamic sealing with the upper joint. The device is simple in structure and easy and convenient to operate, the actual working environment of the subsurface safety valve can be truly simulated, accurate detection of the dynamic sealing performance of the piston dynamic sealing assembly is achieved, and the detection accuracy of the subsurface safety valve is improved. And reliable experimental data support can be provided for sealing material type selection, structure optimization and service life prediction, the operation reliability of the subsurface safety valve is remarkably improved, and the field sudden failure rate and the unplanned production halt risk are reduced.

To provide a technique related to a joint structure of a precast floor slab excellent in bearing force of a joint part.SOLUTION: The floor slab joint structure includes a first upper joint reinforcement and a first lower joint reinforcement that protrude from a first joint end surface of the first precast floor slab and have anchoring bodies formed on tip sides thereof, a second upper joint reinforcement and a second lower joint reinforcement that protrude from a second joint end surface of the second precast floor slab and have anchoring bodies formed on tip sides thereof, an upper reinforcing bar that is arranged along the first upper joint reinforcement and the second upper joint reinforcement in a joint orthogonal direction, and a lower reinforcing bar that is arranged along the first lower joint reinforcement and the second lower joint reinforcement in the joint orthogonal direction, the first upper-stage joint reinforcement and the second upper-stage joint reinforcement are joined to each other and the first lower-stage joint reinforcement and the second lower-stage joint reinforcement are joined to each other by empty lap joints, respectively.SELECTED DRAWING: Figure 4

The utility model relates to the technical field of oil extraction, in particular to an efficient temporary plugging anti-overflow device. Comprising an upper connector, the upper connector is fixedly and hermetically connected with a valve connector, the lower end of the valve connector is fixedly and hermetically connected with a filter pipe and an outer cylinder, the filter pipe is located on the inner side of the outer cylinder, the valve connector is provided with an air hole communicated with an annular cavity between the outer cylinder and the filter pipe, and a check valve is installed in the air hole; the lower end of the filter pipe is fixedly and hermetically connected with a lower pipe located inside the outer cylinder, the lower end of the lower pipe is blocked and fixedly connected with the lower end of the outer cylinder through a lower connector, and a temporary blocking plate is detachably, fixedly and hermetically connected into the lower connector. Through soluble temporary plugging, multi-stage filtering, gas-liquid separation and modular sealing design, the device has the core advantages of efficient overflow prevention, rapid production, airlock prevention, low maintenance cost and the like, has both environmental protection property and economical efficiency, and is suitable for oil well operation under complex working conditions.

The invention relates to the technical field of assembly type houses, in particular to a rapidly-assembled folding type house. According to the technical scheme, the device comprises ground feet arranged at the bottom of a base plate, a threaded rod is arranged between the base plate and the ground feet, the threaded rod is in threaded connection with two symmetrically-arranged threaded blocks, a lower connecting block is fixedly installed at the tops of the ground feet, and an upper connecting block is fixedly installed at the bottom of the base plate; four linkage rods are hinged among the two threaded blocks, the lower connecting block and the upper connecting block, and the four linkage rods form a rhombic structure. The chassis, the main frame, the fixed wallboards and the door and window wallboards can be in butt joint with an original house by disassembling the side wallboards on one side, expansion is achieved, the scale and layout of a dormitory area are flexibly adjusted according to requirements, the use requirements of different scenes are met, meanwhile, the chassis, the main frame, the fixed wallboards and the door and window wallboards are provided with folding rubber layers, and the folding rubber layers are not prone to deformation. And folding can be performed along the folding rubber layer, thereby reducing space and facilitating transportation.

The utility model provides a high-temperature high-pressure small-diameter caliper which comprises an upper connector, a pushing short section and a lower connector which are connected in sequence, the upper connector comprises a first connecting shell and a multi-core shell which are connected with each other, the other end of the multi-core shell is connected with the pushing short section, a first multi-core socket is installed in the multi-core shell, and a second multi-core socket is installed in the lower connector. The outer surface of the first multi-core socket is provided with a sealing section with a sealing ring and a supporting section, the two axial ends of the first multi-core socket are respectively provided with a pin seat, and the inner surface of the multi-core shell is provided with a first convex ring which is in contact with the sealing section and blocks the supporting section. According to the utility model, a split structure is adopted, so that the position of the upper joint can be kept fixed when the upper joint resists high pressure through the multi-core socket with the supporting section, the whole caliper does not need to be improved and materials do not need to be replaced, the equipment cost is greatly reduced, and the caliper under normal pressure can be directly used for caliper measurement of a high-pressure well.

The invention relates to the technical field of fishing barrels, in particular to a self-rotating circulating unfreezing and shearing fishing barrel capable of detecting fish top, which comprises an upper joint, a detection outer barrel, a slip outer barrel and a shifting fork which are sequentially in threaded connection from left to right, and a fish top detection mechanism is arranged in the detection outer barrel; the fish top detection mechanism can move left and right and can block a cavity of the upper connector, a positive circulation channel is arranged on the outer side of the fish top detection mechanism, a clamping slip and a clamping slip seat are installed in the slip outer cylinder, the right end of the clamping slip is of a split structure and can be tightened inwards, sawteeth are arranged on the inner side of the clamping slip, and the right end of the clamping slip is located in the clamping slip seat. And a guide shoe is arranged outside the shifting fork. The device is reasonable and compact in structure and convenient to use, the fish top detection mechanism moves left and right to block the cavity of the upper connector, ground pumping pressure is observed to confirm whether a fish enters an effective part in the fishing socket or not, a pipe column is lifted for fishing after the fish enters the effective part, and the fishing success rate of the coiled tubing fishing socket is increased.

The utility model belongs to the field of valves in wells, and particularly relates to a reverse circulation valve. In order to prolong the service life of the reverse circulation valve and save cost, the utility model provides the reverse circulation valve. The reverse circulation valve comprises a spring, a piston, an upper connector, an outer cylinder and a lower connector, a pressure transmitting hole is formed in the outer cylinder, and the piston comprises a pressure bearing face used for bearing pressure. The piston is located in the outer cylinder, the upper connector or the outer cylinder comprises a spring installation face, the spring is installed between the spring installation face and the piston, the lower connector or the outer cylinder comprises a limiting part, the limiting part is used for limiting the limiting position of downward movement of the piston, and a radial through hole used for being aligned with the pressure transmitting hole during inverse well flushing is formed in the piston; and the inner diameter of the pressurizing seat is smaller than the inner diameters of the upper joint, the lower joint and the outer cylinder. The pressurizing seat is additionally arranged on the piston, and when the spring cannot reset the piston, external force is applied to the pressurizing seat to drive the piston to reset, so that the service life of the reverse circulation valve is prolonged, and the cost is saved.

An adjustable tool for welding a connecting rod of an oil pumping unit relates to the technical field of oil extraction equipment and comprises a main body supporting beam, a sliding rail is arranged on one side of the top end of the main body supporting beam, a handle is arranged at one end of the sliding rail, a rolling lead screw is connected to the handle, a connecting rod upper connector support is connected to the rolling lead screw, and a connecting rod lower connector support is connected to the connecting rod upper connector support. The connecting rod upper joint support is connected to the sliding rail in a sliding manner; a connecting rod lower connector support is arranged on the other side of the top end of the main body supporting beam and fixedly connected to the main body supporting beam. A plurality of middle supports are arranged between the connecting rod lower connector support and the connecting rod upper connector support and fixedly connected to the main body supporting beam. According to the utility model, the assembly and welding of different types of connecting rods of various oil pumping units can be realized, the frequency of manufacturing tools of each type is reduced, the space occupied by the tools is also saved, and the production and manufacturing cost is further reduced.

The utility model relates to a multistage reducing fish fishing tool, which comprises an upper joint and a spear rod, the upper joint can be connected with a drilling tool and is provided with an axial through joint water hole, and the spear rod comprises a first section connected with the upper joint, a second section connected with the first section and a conical guide cone connected with the second section. The diameter of the first section is larger than that of the second section, the first section, the second section and the guide cone are integrated, the spear rod is provided with a spear rod water hole penetrating through the first section, the second section and the guide cone in the axis direction, the spear rod water hole is communicated with the connector water hole, and the first section and the second section are each provided with a sliding block. The utility model overcomes the problems of complicated fishing operation, high failure rate and low efficiency when the conventional fishing tool is used for fishing the multi-stage stacked fishes with different inner diameters, and provides the multi-stage variable-diameter fish fishing tool, so that the fishing operation is simpler and more convenient, and the fishing success rate is improved.

The present application relates to a kind of drill string short section of preventing sticking and its using method, and the short section short section upper joint, short section body and short section lower joint;The short section body is arranged between the short section upper joint and short section lower joint, and the short section body surface is provided with the rock breaking cutting tooth structure for breaking the cuttings in annulus and hydraulic pulse perforating structure;The short section upper joint is connected with drill string by internal thread, and the short section upper joint is equipped with the rock breaking control device for controlling the hydraulic pulse perforating structure;The short section lower joint is connected with drill string by external thread, and is close to drill bit.Therefore, the present application can be widely used in the field of oil and gas drilling.

The utility model provides a folding awning sheet framework connecting structure and an awning thereof, and belongs to the technical field of building sunshade. The problems that a rotary connecting structure between curtain pieces of an existing awning is too complex, contraction and unfolding of the curtain pieces are affected to a certain degree, and the curtain pieces are more inconvenient to mount and dismount are solved. A folding sky curtain sheet framework connecting structure comprises a curtain sheet structure, the curtain sheet structure comprises a curtain sheet, an upper joint and a lower joint, hinge columns are arranged on the two sides of the curtain sheet, a first hinge groove is formed in the lower joint, and a second hinge groove is formed in the upper joint. The hinge columns on the two sides of the curtain piece are rotationally arranged in the first hinge groove of the lower joint and the second hinge groove of the upper joint correspondingly, and the curtain piece, the upper joint and the lower joint are sequentially connected in series to form a curtain piece structure. The curtain has the advantages that the connecting structure between the curtain pieces is simple, transverse dislocation is avoided, and the curtain pieces are more convenient to mount and dismount.

The present invention provides a bridge plug valveless hydraulic sealing tool, comprising: a forward and reverse motor, an upper joint, a sleeve, a bidirectional hydraulic pump, a soft oil pipe, an oil storage tank, a push rod piston, and a shift ring. The sleeve inside the upper joint is connected to the shafts of the forward and reverse motor and the bidirectional hydraulic pump, the soft oil pipe is connected to the bidirectional hydraulic pump and the upper end of the push rod piston, the push rod piston forms a first sealing chamber and a second sealing chamber with the inner wall of the cylinder, and a first hollow oil passage and a second hollow oil passage are provided inside the push rod piston, the first hollow oil passage is connected to the soft oil pipe and the first sealing chamber, the second hollow oil passage is connected to the oil storage tank and the second sealing chamber, and the lower end of the push rod piston is connected to the bridge plug through the bridge plug upper joint. The present invention realizes the sealing action and the resetting and recovery action through the forward and reverse rotation of the forward and reverse motor, has a reasonable structure, is simple to operate, has high efficiency, is shorter in length, is easy to transport, and is reusable.

The utility model provides an upper connector pneumatic clamp, and belongs to the technical field of pneumatic clamps. The problems that in the prior art, sealing reliability is poor, an air path is single, and multiple air cylinders or complex clamping actions cannot be expanded are solved. The pneumatic clamping device comprises an installation base, a pneumatic clamping unit and an air path interface module, a plurality of installation holes are formed in the installation base, the pneumatic clamping unit comprises an air cylinder barrel, a piston rod, a piston assembly, a piston end cover and a base supporting block, and an upper connector and a lower connector are formed at the upper end and the lower end of the piston end cover respectively. The upper connector and the lower connector are communicated with each other, the upper connector is sleeved with the piston assembly, the piston rod penetrates through the upper connector and the lower connector, the piston assembly is covered with the air cylinder barrel, the driving connector is installed at the upper end of the base supporting block, the piston rod is connected with the driving connector, and the air path interface module is fixedly installed on the side face of the installation base. The multi-station synchronous clamping device has the advantages of multi-station synchronous clamping and good sealing effect.

The present application relates to the technical fields of deepwater drilling and workover technology of offshore oil engineering, and particularly relates to a joint for emergency release of a deepwater light drilling and workover underwater riser and an operating method thereof. The emergency release joint comprises an upper joint body and a lower joint body which are mutually butted. A locking assembly composed of a clamp and a support ring is arranged on the periphery of the butt joint, and an electromagnetic drive assembly is correspondingly arranged. Upper and lower blowout preventer modules are arranged on both sides of the butt joint along the fluid passage in axial opposition. The electromagnetic drive assembly is used to drive the support ring to move between two working positions, so as to control the locking or releasing of the clamp on the butt joint. In operation, the upper and lower blowout preventer modules are first controlled to be closed, and then the mechanical locking is released to realize the release of the joint. After reconnection, the mechanical locking is restored and the fluid passage is opened. The scheme is suitable for emergency release and subsequent reconnection of the deepwater riser under abnormal working conditions.

The invention relates to the technical field of oil extraction testing, in particular to a separate injection well packer sealing examination pressure relief device and a working method.The separate injection well packer sealing examination pressure relief device comprises an upper connector, a pressure relief section and a lower connector, the outer wall of the upper connector is sleeved with a sealing ring A, the upper end of the upper connector is provided with internal threads, and the pressure relief section is of a hollow cylinder structure; a through hole is formed in the outer wall, a sealing ring B is arranged between the outer wall and the upper connector, the lower end of the pressure relief section is of a conical structure and embedded into the lower connector, the lower connector is of a hollow cylindrical structure, a through hole is formed in the outer wall, and sealing rings C are arranged on the two sides of the through hole formed in the outer wall of the pressure relief section respectively. The sealing examination pressure relief device for the separated layer water injection well packer is simple in structure and convenient to assemble and disassemble, pressure relief can be achieved only by lifting an instrument, the pressure relief section and the upper connector are in interference fit through the sealing ring B to prevent threads from loosening or reversing, the stability and safety of the device are ensured, the sealing ring is of a replaceable structure, and the sealing ring is convenient to replace. The maintenance cost is reduced; and the service life of the device is prolonged.

The utility model discloses a jar for dismounting a sealing plug, which solves the problems of complex structure and poor adaptability of the existing jar, and adopts the technical scheme that the jar comprises an upper joint, a lower joint and a central rod, the two ends of the central rod are respectively connected with the upper joint and the lower joint, and a jar ring is movably sleeved on the central rod, and the upper joint or the lower joint is movably sleeved on the central rod. The device is extremely simple in structure, flexible, small and exquisite, and capable of effectively providing jarring force and quickly disassembling the sealing plug.

The invention provides a constant-torque shock absorber, which belongs to the technical field of well drilling, and comprises an outer barrel with an inner cavity, and an upper joint, an upper sleeve, a spline housing, a middle barrel, a connecting body, a lower sleeve, a lower connecting body and a lower joint which are connected in sequence; the inner core shaft is provided with a central flow channel, is arranged in the outer cylinder body, and comprises an upper core shaft, a middle core shaft, a core shaft connecting body, a lower core shaft and an extension core shaft which are connected in sequence; the damping assembly comprises a line contact rolling assembly installed on the upper mandrel, a small disc spring installed on the middle mandrel and a large disc spring installed on the lower mandrel. Harmful torsional vibration can be restrained in the drilling operation, so that the purposes of protecting a drill column, improving the drilling speed and reducing the cost are achieved.

The invention relates to the technical field of downhole operation fracturing tools, in particular to a three-piece expanding packer. The three-piece expanding packer comprises a main body, a central pipe and a lower rubber sleeve seat, a setting opening is formed in the side wall of the central pipe, a rubber sleeve corresponding to the setting opening in position is arranged outside the central pipe, and the rubber sleeve is a high-performance rubber sleeve; the main body is integrally formed by an upper joint and an upper rubber sleeve seat and is mounted at the top end of a central pipe, and the lower rubber sleeve seat is mounted on the central pipe and clamps the lower end and the upper end of a rubber sleeve with the main body respectively to fix the rubber sleeve; all the components are connected through T-shaped threads. According to the three-piece expanding packer, the center pipe and the lower connector are combined into a whole, so that the structure of the packer is simplified; by using the T-shaped threads, the occurrence rate of thread gluing is reduced, and the repair rate of the device is increased; by using the high-performance rubber sleeve, the total length of the device and the sealing surface of the rubber sleeve are greatly shortened, the total weight of the device is reduced, and the deblocking rate of the device is improved.

The direct-current motor transmission eight-arm sidewall contact device comprises an upper connector, a supporting part and a lower connector which are sequentially connected, and the supporting part comprises a balance part, a driving part, a left push rod part, a first supporting part, a second supporting part, a right push rod part and an energy storage part which are sequentially connected. The two-way pump is driven by one motor, the eight sidewall contact arms are driven to synchronously expand and contract, power is applied to the sidewall contact arms from the two ends at the same time, the pushing effect of the sidewall contact arms is improved, the fixed sidewall contact device is more stable, the pressure of high-pressure hydraulic oil is relieved through the energy storage part, and the safety of the sidewall contact device is improved. The pole plate is supported only by the main arm and the auxiliary arm, so that the attaching effect of the pole plate and the well wall is improved, and the sidewall contact device is more suitable for different well wall shapes. And through the matching of the long connecting rod and the short connecting rod, the structure of the sidewall contact device is simpler, and the maintenance difficulty is reduced.