496 results about "Shear pin" patented technology

The support comprises an upper seat plate, a spherical crown lining plate, a middle steel lining plate and a lower seat plate, the upper seat plate is fixedly installed at the bottom of a beam bottom, the spherical crown lining plate is arranged between the upper seat plate and the middle steel lining plate, the middle steel lining plate is arranged between the spherical crown lining plate and the lower seat plate, and the spherical crown lining plate is fixedly installed on the lower seat plate. The lower seat plate is fixedly mounted at the top of a bridge pier, the bottom surface of the upper seat plate is fixedly connected with a first limiting ring through a first anti-shear pin, the first limiting ring abuts against the middle steel lining plate, the top surface of the lower seat plate is fixedly connected with a second limiting ring through a second anti-shear pin, and the second limiting ring abuts against the middle steel lining plate. In a normal use state, the slip surface adopts a large curvature radius and a small friction coefficient to provide smaller damping, reduce the acting force of the support on a bridge and reduce the lifting of a beam end, and in an earthquake state, the slip surface adopts a small curvature radius and a large friction coefficient to provide larger damping, so that the shock absorption and isolation effect of the support is improved; and displacement of the bridge under the earthquake condition is controlled.

The invention relates to the technical field of sand control well completion in oil exploitation, in particular to a gravel packing tool and a using method. According to the technical scheme, the device comprises a releasing mechanism, an anchoring mechanism, an oil sleeve annulus sealing mechanism and a filling conversion mechanism, the lower end of an anchor body of the anchoring mechanism is connected with an upper center pipe, a liner pipe is arranged on the inner side of the anchor body, multiple sets of pressing plates and anchor tile grooves are arranged on the outer wall of the anchor body, and springs are arranged between anchor tiles and the pressing plates; a cylinder sleeve and a distance ring are arranged on the outer side of the upper center pipe, a locking ring is arranged at the lower end of the anchor body, an adjusting ring, a leather cup pressing cap and a leather cup are installed on the outer wall of the outer center pipe, and the outer side of the leather cup pressing cap is connected with the lower end of the cylinder sleeve through a second shear pin. The tubular column has the beneficial effects that various working conditions such as safe well descending, tubular column anchoring, annulus high-pressure sealing, filling and inverse well flushing are converted through one tubular column, two releasing modes of mechanical releasing and hydraulic releasing are achieved, the structure is simple, the number of solid parts is relatively small, the machining amount is small, and the cost is low.

A fastening device for releasable connection to a perforated rail of an aircraft and a method of assembly for such a fastening device. The fastening device comprises a housing having at least one locking head portion fixedly connected to the housing, at least one shear pin and an actuating pin. The locking head portion is insertable into a rail hole of the perforated rail and slidable along the longitudinal direction of the perforated rail to a locking position in which the locking head portion engages a slot portion of the perforated rail. The shear pin can be engaged with a rail hole of the perforated rail by axial displacement. The actuating pin is rotatably arranged relative to the housing and connected to the shear pin in such a way that a rotation of the actuating pin causes an axial displacement of the shear pin relative to the housing.

A packer assembly includes (a) a mandrel bearing an expandable packer element, the mandrel having a ratchet section, a lower collet retaining shoulder, and defining a plurality of longitudinal slots; (b) a push sleeve connected to a ratchet ring by at least one shear pin, wherein the ratchet ring is disposed between push sleeve and the mandrel and engages the mandrel ratchet section; (c) a shift sleeve comprising an inner shift sleeve slidingly disposed within the mandrel and having a lower collet, the inner shift sleeve defining a profile for engaging a shifting tool, and an outer shift sleeve slidingly around the mandrel and connected to the inner shift sleeve with a plurality of bolts, wherein each bolt passes through a longitudinal slot defined by the mandrel; (d) wherein the shift sleeve and push sleeve is moveable between a running position and a released position. Also disclosed are methods of using a packer actuated by a sliding sleeve.

The invention relates to the technical field of unconventional oil and gas reservoir exploitation, in particular to a tool capable of achieving full bore after intelligent opening of multiple sliding sleeves and a tool construction method, and aims to relieve the technical problem that the success rate is low when the sliding sleeves are opened in an intelligent mode in related technologies. According to the tool capable of achieving the full bore after the intelligent opening of the multiple sliding sleeves is pressed, when the first outer barrel is pressed, pressure acts on the first starting sliding sleeve, after a first fixing shear pin is cut off, the first starting sliding sleeve loses limitation, and the moving stroke is reserved for a first magnetic block; when the opening tool passes through the first magnetic block, the magnetic pole generated by the opening tool is the same as that generated by the inner end of the first magnetic block, the first magnetic block slides outwards in the radial direction of the first outer barrel, and therefore limitation to the inner sliding sleeve is relieved, the inner sliding sleeve slides by pressing the interior of the first outer barrel again, the through hole is not blocked any more, and the sliding sleeve assembly is opened. By means of the design, the influence of underground complex working conditions on sliding sleeve opening is effectively reduced, and the success rate of sliding sleeve opening is guaranteed.

To provide a gas supply device capable of suppressing undesirable separation of a separation joint.SOLUTION: A hydrogen gas filling device 1 includes a gas supply pipeline 5 and a hose 6, a nozzle 7, and a separation joint 31 for separating the hose 6 and the gas supply pipeline 5 from each other in emergency, the separation joint 31 having a nozzle side joint 31A, an opposite-nozzle-side joint 31B, a shear pin 31C. The separation joint 31 is separated into the nozzle side joint 31A and the opposite-nozzle-side joint 31B by the fracture of a shear pin 31C when predetermined force is applied between the nozzle side joint 31A and the opposite-nozzle-side joint 31B. The hydrogen gas filling device 1 further includes a desorption regulation device 41 separately from the shear pin 31C, for keeping a state of connection between the nozzle side joint 31A and the opposite-nozzle-side joint 31B.SELECTED DRAWING: Figure 2

The utility model discloses a whipstock system. The whipstock system comprises a feeding and releasing module and a whipstock, the feeding and releasing module comprises an upper connector, a connecting rod and a supporting sleeve which are connected in sequence, and one side of the supporting sleeve of the feeding and releasing module is inserted into the hollow whipstock; the feeding and releasing module is of a hollow tubular structure; the interior of the upper connector is in threaded connection with one end of the connecting rod, and the other end of the connecting rod is inserted into the whipstock after being connected with the supporting sleeve through a shear pin. A positioning groove is formed in the inclined surface of the whipstock; a boss is arranged at the position, corresponding to the positioning groove, of the upper joint; and the positioning groove is embedded with the boss and is used for driving the whipstock to rotate together when the upper joint rotates. According to the utility model, a main borehole production channel can be reserved while the whipstock is arranged, and the whipstock is simple in structure, convenient to operate and high in reliability.

The invention relates to the technical field of open flow after oil field fracturing, in particular to an oil pipe temporary plugging device and an oil pipe temporary plugging short starting method. According to the oil pipe temporary plugging device and the oil pipe temporary plugging short starting method, the outer cylinder is put into a well along with a pipe column, a plugging device is put in, the pipe column is fixed and plugged through a machine body structure and a positioning mechanism, the pipe column is lifted to enable a large-diameter tool to be located above a fractured stratum, then pressure is applied to the interior of the well to enable a shear pin to be fractured, and the pressure pushes a valve element to move downwards; and after the pipe column recovers circulation, the blowout work is continued. According to the oil pipe temporary plugging device and the oil pipe temporary plugging short starting method, the outer cylinder is put into the well along with the fracturing pipe column, then the plugging device is put, the fracturing pipe column is plugged, large-diameter tools such as a packer in the pipe column are lifted to the position above the fracturing well section, then open flow is recovered, sand can be settled to the artificial well bottom after formation sand production, the pipe column cannot be influenced, and the oil pipe temporary plugging short starting method has the advantages of being simple in structure and convenient to operate. And the phenomenon that large-diameter tools such as a packer are buried and blocked by gravels, so that a pipe column is buried by sand and blocked by the gravels is avoided.

The invention discloses a gas well swabbing and draining device and a swabbing and draining method thereof, and relates to the technical field of drainage and gas recovery equipment.The gas well swabbing and draining device comprises a production oil pipe, a continuous oil pipe and a drainage pipe, the swabbing liquid discharge plunger comprises a connecting cylinder, and a pressure control spring is arranged at the axis position of the connecting cylinder; the first end of the piston with the long rod is fixed to the connecting cylinder through a shear pin with a fixed shear value; and the pressure relief channel is arranged on the outer side wall of the connecting cylinder. According to the gas well swabbing and draining device, the technical problems that a swabbing and draining plunger in an existing gas well swabbing and draining device is difficult to maintain automatic draining, and a continuous oil pipe and the swabbing and draining plunger are damaged due to too large downward pulling force are solved; when the pressure difference between the upper end position of the swabbing and liquid discharging plunger and the lower end position of the swabbing and liquid discharging plunger is larger than a first design value, accumulated liquid can be discharged into the gas well through the first center channel, and the downward pulling force borne by the coiled tubing and the swabbing and liquid discharging plunger is reduced.

The packer comprises a mandrel and an outer pipe assembly, a first reducing assembly comprises an upper cone, a first auxiliary block and a first supporting block, and the first auxiliary block and the first supporting block are arranged in a staggered mode; the second reducing assembly comprises a lower cone, a second auxiliary block and a second supporting block, the hydraulic cylinder assembly comprises a hydraulic cylinder, a limiting piston, a fixing ring and a piston are sequentially arranged in the hydraulic cylinder from top to bottom, the hydraulic cylinder is used for being connected with the lower cone, the limiting piston is connected with the hydraulic cylinder through a setting shear pin, and the piston is connected with the outer pipe assembly and the slip assembly. The second auxiliary blocks and the second supporting blocks are arranged in a staggered mode. According to the technical scheme provided by the invention, the problem that a conventional packer cannot be set on a standard casing pipe after passing through the casing pipe when the casing pipe is continuously used after being repaired is solved. The packer has the advantages of being large in sealing annulus, high in pressure bearing capacity and the like.

The utility model relates to a standard ring duct piece for a sunken vertical shaft. The standard ring duct piece mainly comprises a duct piece, a shear pin, a U-shaped stud component and a double-end stud, the pipe pieces are of a trapezoid-like structure, a complete annular structure is formed in a staggered joint splicing mode, the overall stability is improved, and construction site management is simplified. According to the utility model, the hoisting reliability and safety are enhanced by optimizing the design of the hoisting pin holes, and meanwhile, the sealing performance and the impermeability are improved by the sealing components arranged on the inner side and the outer side of the duct piece. The built-in steel plate structure facilitates installation of subsequent facilities, and the duct pieces do not need to be damaged. The stability and the shear resistance are further enhanced through the shear-resistant taper pins and the optimized connecting mode. By means of the innovative design, construction efficiency is improved, engineering safety is guaranteed, and technical progress and remarkable effects are shown.

The invention discloses a hard formation open hole windowing sidetrack drilling tool string which comprises an upper drilling tool, a measurement-while-drilling instrument, a circulating valve, a feeding tool, a shearing short section, a hollow whipstock, a matched long drill collar, an anchoring packer, a tracer short section and a guiding shoe which are sequentially connected through threads from top to bottom. The hollow whipstock, the matched long drill collar, the anchoring packer and the tracer short section are respectively provided with an inner drift diameter, a pressure transmission pipeline is further arranged in each inner drift diameter, the pressure transmission pipelines are connected with the hollow whipstock, the shearing short section, the matched long drill collar and the anchoring packer in series, and the hollow whipstock extends into the shearing short section and is fixed through a shearing pin. The setting success rate and the windowing operation efficiency of the hard formation open hole section anchoring packer are remarkably improved, the borehole wall collapse risk and the main borehole pollution risk are effectively reduced, the operation safety coefficient is improved, and simultaneous production of the main borehole and the branch borehole can be achieved during reproduction.

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 provides an anchoring packer for a multilateral well and multilateral well drilling equipment. The anchoring packer comprises a mandrel assembly, an anchoring mechanism and a rubber sleeve sealing mechanism. The mandrel assembly comprises an upper connector with a pressure transmission hole and a mandrel forming a first pressure cavity with the upper connector. The anchoring mechanism comprises an upper slip arranged on the mandrel in a sleeving mode, a conical sleeve and a first piston assembly, the conical sleeve is in sliding connection with the upper slip through an inclined face, and the conical sleeve and the mandrel are limited through a first shear pin. The rubber sleeve sealing mechanism is arranged below the anchoring mechanism and comprises a second piston assembly, a rubber sleeve and an extrusion sleeve, and the overlapping position of the second piston assembly and the first piston assembly is connected through a second shear pin. The mandrel is provided with a hydraulic channel communicated with the first pressure cavity and the second pressure cavity. During operation, hydraulic oil enters through the pressure transmission hole to drive the first piston assembly to move upwards to cut off the first shear pin, and the conical sleeve is pushed to enable the upper slip to anchor the well wall in the radial direction; meanwhile, the second piston assembly is driven to move downwards to cut off the second shear pin, and the rubber sleeve is extruded to radially expand to achieve sealing.

The invention relates to the field of packers, in particular to a high-sealing-performance recoverable anchoring packer which comprises a connecting sleeve used for tripping the packer into an oil pipe, and a releasing pipe column is coaxially and fixedly arranged in the connecting sleeve; the top end of the sliding sleeve is mounted in the connecting sleeve in a matched and sliding manner through a piston, and the sliding sleeve is used for transmitting pressure downwards along the axis; the sealing assembly comprises an upper pressure-bearing seat and a lower pressure-bearing seat, the bottom end of the sliding sleeve is fixedly connected with the top end of the upper pressure-bearing seat, and a sealing rubber sleeve is arranged between the upper pressure-bearing seat and the lower pressure-bearing seat; the anchoring assembly comprises a slip cylinder, and anchoring slips capable of moving in the radial direction are evenly installed on the outer wall of the slip cylinder; the locking assembly comprises a lock sleeve, a fishing pipe and a lock ring. The anchoring and sealing processes are sequentially carried out in single setting, anchoring is stable, the sealing effect is good, setting efficiency can be improved, meanwhile, relative rotation between the fishing pipe and the lock sleeve and relative rotation between the fishing pipe and the sliding sleeve can be prevented, and accidental breakage of the setting shear pin or the unsetting shear pin is avoided.

The utility model discloses a novel standard valve which comprises a fishing head, an outer pipe assembly is fixedly arranged on the fishing head, an inner pipe assembly is movably arranged in the outer pipe assembly, a valve element assembly is fixedly arranged on the inner pipe assembly, and the valve element assembly is arranged at one end of the outer pipe assembly. According to the novel standard valve, the outer pipe assembly, the inner pipe assembly and the shear pin are used in cooperation, so that the novel standard valve is in different states in the working process and the throwing and fishing process, and in the working state, fluid can be blocked from left to right and can circulate from right to left; in a salvage state, left and right fluids can circulate; the Tesla valve is characterized in that when the Tesla valve is in a working state, fluid needs to pass through the Tesla valve channel, due to the uniflow property of the Tesla valve channel, the fluid cannot pass through the fluid channel smoothly, the purpose of preventing the fluid from flowing is achieved, when the right liquid flows through the Tesla valve channel in the forward direction, the right liquid can pass through the Tesla valve channel smoothly, the overall structure is simple, and operation is convenient. Not only is the use cost reduced, but also the well control risk during oil well operation is reduced.

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.

An adaptor kit is configured to limit the amount of shear pins / metal / material left downhole after the frac plug is set and the setting tool is removed from the hole. More specifically, embodiments may utilize a setting sleeve that is configured to set the frac plug.

A modular screw for a vertebral fixation system includes a fastener with a head and shank, and a housing assembly including a housing and a piston. The head is insertable via bottom-loading into a distal end of the housing. The housing assembly may include a ring and one or more biasing members, where the piston is downward biased by the one or more biasing members and holds the ring in a first position. The head engages the piston and causes the piston to release the ring, which transitions to a second position and engages the head and prevents removal of the head from the housing. The one or more biasing members include a spring that is optionally integrally formed with the piston. In addition, the piston is optionally a multi-piece component. Further, the head is optionally a multi-piece component, with a portion installed within the housing via a shear pin.

The utility model discloses a graded energy consumption type seismic mitigation and isolation support, and relates to the technical field of seismic mitigation and isolation supports. The rubber support is connected to the bottom of the spherical support; the bottom basin assembly comprises a bottom plate and supporting stoppers, the supporting stoppers are fixed to the periphery of the bottom plate, the ends, away from the spherical support, of the rubber supports are connected with the bottom plate, the rubber supports are located in the supporting stoppers, and threaded holes are formed in the ends, away from the bottom plate, of the supporting stoppers; and the limiting stop block is fixed in the threaded hole in the supporting stop piece through the anti-shear pin, and the inner edge of the limiting stop block protrudes out of the inner side of the supporting stop piece and is used for limiting the spherical support. The graded energy dissipation function is achieved, when a bridge and a building structure normally operate, the spherical support horizontally moves and turns, and friction energy dissipation of the spherical support is mainly achieved; under the action of an earthquake, the rubber support is subjected to shear deformation, and the spherical support and the rubber support are combined to consume energy.

The utility model discloses a double-motor and gear box integrated driving assembly which comprises a double-input gear box and a double-output gear box. A sliding bush is embedded into an input shaft at the end of the double-input gear box, a torsion limiting shear pin is relatively and fixedly connected to one side of the outer surface of the sliding bush, internal splines are distributed on the inner wall of the sliding bush at equal intervals, axial motors are symmetrically distributed on the outer side of the input shaft of the double-input gear box in a group, and spline shafts are fixedly connected to one ends of output shafts of the axial motors. The spline shaft and the inner spline are fixedly connected and matched. The double-motor arrangement is adopted, the energy consumption of a vehicle can be reduced, meanwhile, the motor abrasion is reduced, the double-input gear box and the axial motor are connected in a matched mode through the inner spline and the spline shaft, tiny errors of the axial motor and the double-input gear box shaft can be made up, the maximum input torque of the motors is limited through shearing of the torque limiting shearing pin, and the torque limiting effect is good. And the double-input gear box is arranged in the middle of the axle in the middle, so that the damage probability of wheels can be reduced.

The invention relates to the technical field of underground operation, in particular to a hydraulic reaming tool while drilling, which comprises an upper joint, a reaming tool body, a sealing joint, an upper central tube, a lower central tube, an inner central tube, a power piston, a blade and a throttle valve component. A sealing connector is fixedly installed on the inner side of the lower end of the reaming tool body. The device is reasonable and compact in structure and convenient to use, by arranging the throttling valve assembly, after the opening ball is put in, the throttling valve assembly can move downwards to open the through hole, and therefore under the flow limiting effect of the throttling valve and the effect of liquid pressure, the power piston is pushed to move upwards, and the blades move upwards along the guide slope face and are opened; by arranging the inner center pipe, the fixed shear pin can be cut off after the closing ball is thrown in, so that under the action of liquid pressure, the lower end of the inner center pipe abuts against the limiting ring table, the lower center pipe and the auxiliary power piston are pushed to move downwards, a clamped blade is withdrawn, and the reaming device has the advantages of being stable, reliable and good in reaming effect.

The fixture for milling the valve body groove of the shear pin type safety valve of the present invention includes a workbench. A T-shaped groove is provided on the upper surface of the workbench, and a T-shaped nut is arranged in the T-shaped groove. A base is provided on the workbench. A through hole a perpendicular to the upper surface of the base is provided in the middle part of the base. A mandrel is arranged in the through hole a. The mandrel is a cylindrical structure that is thinner at the upper part and thicker at the lower part. Through slots a are provided at both ends of the base. An eccentric wheel perpendicular to the mandrel is connected in the through slots a through a pin shaft. The eccentric wheel slightly protrudes from the bottom surface of the base. A handle is fixedly connected to the side surface of the eccentric wheel. A boss b is arranged on the side surface of the base close to the through hole a. The boss b is connected to an L-shaped limit block through a threaded pin shaft. The fixture for milling the valve body groove of the present invention can realize the milling processing of valve body grooves of various specifications, has a compact structure, is safe and reliable, and is convenient to use, and solves the problems of difficult clamping and alignment during the processing of valve body grooves.

The invention is a washable well gravity setting side flow packer used in simple separate layer water injection string, belonging to oil production engineering application technology. The invention has two structures. The first structure shown in figure 1 is composed of upper body 1, center tube 2, big spring 4, liner 9, wash well piston 6, rubber cylinder group 10, lower body 16 and setting shear pin 15. The second structure shown in figure 2 is different from the first structure in that there is no upper side flow channel, but the lower side flow channel is provided with a check valve. The gravity setting side flow packer is used for separate layer water injection, and the water distribution plugger can be set on the center tube of the packer, without using independent water distributor, thus being beneficial to fine layer water injection and convenient for plugger fishing. The packer setting does not need pump truck pressure, but relies on pipe string heavy pressure for setting, and there is no problem of pipe string overload during pipe string lifting, thus simplifying the separate injection process.

The utility model relates to the technical field of oil well liquid drainage, in particular to a negative pressure liquid drainage device. Comprising an upper connector, a sealing conical surface is formed in the upper connector, the lower end of the upper connector is fixedly and hermetically connected with an outer cylinder, the lower end of the outer cylinder is fixedly and hermetically connected with a lower connector, a piston blind plate is arranged in the lower connector, connected with the lower connector through a shear pin and in sealed contact with the upper connector, and a screen pipe is fixedly and hermetically connected in the lower end of the piston blind plate. The lower end of the screen pipe extends to the position below the lower connector and is blocked. The screen pipe and the piston blind plate are automatically released through fracture of the shear pin, external power or manual intervention is not needed, instant communication of a shaft and an oil pipe column is achieved, and the liquid drainage starting time is remarkably shortened.

The invention belongs to the technical field of downhole tools, and particularly relates to a water control sliding sleeve. The water control sliding sleeve comprises a sliding sleeve body, and a plurality of circulating holes are formed in the side wall of the sliding sleeve body. The inner sealing cylinder is arranged in the sliding sleeve body through a first shear pin and covers the circulating hole, and a sealing ring is arranged between the sliding sleeve body and the inner sealing cylinder; the sealing protection cylinder is connected with the inner sealing cylinder through a second shear pin; when the inner sealing cylinder responds to pressure to shear off the first shear pin and moves relative to the sliding sleeve body, the sealing protection cylinder is driven to move to cover the sealing ring, then the second shear pin is sheared off, the inner sealing cylinder continues to move downwards, and the circulation hole is opened. The sealing ring can be always in a protected state, so that the service life is prolonged.

The invention discloses a cement retaining device, which relates to the technical field of petroleum drilling, and comprises an upper joint, a long central pipe and a sealing sleeve, a piston is fixed through a setting shear pin and is hydraulically driven to act; the lower end of the piston is connected with an elastic claw and can transmit setting force and achieve releasing separation, and the lower portion of the piston is connected with a compression cylinder and an upper conical head in series through a claw connector. The anchoring mechanism is composed of an upper conical head, a lower conical head, an anchor tooth block and the like and can expand in the radial direction to clamp the casing pipe during setting. The compression sleeve linked with the rubber sleeve assembly can extrude the rubber sleeve assembly to realize sealing; the cement injection channel is composed of a lower connector, a one-way valve and a cement injection head and ensures one-way cement injection. The design that an unblocking fishing head, a thrust ring and inner teeth of a compression cylinder are meshed is adopted in the unblocking mechanism, the thrust ring can be retracted by lifting the fishing head upwards, and therefore anchoring and sealing are relieved. Setting, squeezing and sealing, cement injection and fishing operation are achieved through one pipe column, a large-drift-diameter cement injection channel is provided after releasing, finally, the whole body is fished out of a well, no fish is left at the bottom of the well, drilling and grinding are not needed, and construction operation and well plugging cost is saved.

The invention relates to a spline type mechanical sliding sleeve assembly and mechanism for well drilling and a using method thereof.The mechanical sliding sleeve assembly comprises a shell and a connector connected to the bottom of the shell, the shell is provided with a through hole penetrating in the vertical direction, a screen pipe hole is formed in the side face of the shell, a sliding sleeve assembly is further arranged in the through hole of the shell, and the sliding sleeve assembly slides in the vertical direction; the sliding sleeve assembly is arranged between the connector and the screen pipe hole to be switched between a first state for shielding the screen pipe hole and a second state for avoiding the screen pipe hole, an anchoring assembly is arranged between the sliding sleeve assembly and the connector, and when the sliding sleeve assembly slides downwards to the tail end of the stroke, the sliding sleeve assembly is anchored to the connector through the anchoring assembly. The sliding sleeve assembly is provided with a channel for circulating liquid to flow, and the mechanical sliding sleeve assembly further comprises a soluble ball and a shear pin used for locking the sliding sleeve assembly in a first state. When the sliding sleeve assembly is blocked and cannot be contacted during drilling, the sliding sleeve assembly can be opened by throwing a ball to become a perforated screen pipe, and the perforated screen pipe serves as a lining pipe to support the well wall to enter well completion operation.

The utility model relates to the technical field of oil drainage devices in oil fields, in particular to an oil well pump oil drainage device and an oil well pump. The oil drainage device of the oil well pump comprises an oil drainage device body and a shear pin, a connecting hole is formed in the oil drainage device body, the shear pin is provided with a connecting section and a front cutting section, the connecting section is installed in the connecting hole, the shear section extends into an oil liquid channel, and an oil drainage hole of a blind hole structure is formed in the shear pin. An opening of the oil drainage hole is located in the outer end face of the shear pin, the tail of the oil drainage hole is located on the shear section, a shear ring is installed at the upper end of the oil channel in the oil drainage device body in a threaded mode, and an inner hole of the shear ring is communicated with the oil channel and provided with a rotation stopping hole section matched with a piston of an oil well pump. The rotation stopping hole section is used for being matched with a rotation stopping head at the bottom of the piston and enabling the shearing ring to be tripped through forward rotation. According to the utility model, the screw thread type shearing ring is designed, and the sucker rod and the piston are used for releasing and draining oil, so that the problems of crude oil waste, environment pollution and the like caused by pulling out the sucker rod are avoided.