217 results about "Shear pin" patented technology

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 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 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 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 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 application discloses a shearing pin embedded outer package super high performance concrete-steel pipe concrete swing bridge pier, which is applied to a bridge and comprises a bearing platform and a composite pier column arranged on the bearing platform, a shearing resistance assembly is embedded in the lower part of the composite pier column and matched with the bearing platform, and a UHPC layer of the composite pier column and a steel pipe layer-concrete column (steel pipe concrete CFST) form a swing bridge pier (UHPC-CFST swing pier); this makes the scheme capable of utilizing UHPC and CFST to improve the toughness of the body, and capable of solving the swing rotation and shearing limiting contradiction of the bridge pier system through a connecting structure; the scheme improves the impact resistance and compression crushing resistance through the collaborative stress of the UHPC shell and the internal CFST, realizes the compatibility of high shearing bearing capacity and excellent self-resetting capacity through the 'limiting translation and releasing rotation' mechanism of the CFST shearing pin and the steel sleeve ring cooperation, and can solve the problems of insufficient interface shearing capacity of the existing swing bridge pier under strong earthquakes and impact loads and easy compression crushing of the pier bottom.

A tool for replacing a shear pin of a water guide mechanism of a water turbine comprises a bottom plate, sliding grooves are formed in the two sides of the bottom plate respectively, sliding blocks are arranged in the sliding grooves, positioning blocks are arranged on the sliding blocks, and the positioning blocks are used for being matched with original bolts on the water guide mechanism to achieve installation and fixation of the tool. A lifting plate is arranged on the bottom plate, a hydraulic cylinder bearing plate capable of horizontally moving is arranged on one side of the lifting plate, two hydraulic cylinders are arranged on the hydraulic cylinder bearing plate, push rods of the two hydraulic cylinders are oppositely arranged, clamping blocks are arranged on the push rods, and the two clamping blocks make contact with each other and clamp the auxiliary crank arm. By the adoption of the structure, the auxiliary crank arm can be effectively jacked, shear pin mounting holes of the main crank arm and the auxiliary crank arm can be conveniently and rapidly aligned, and the problems that in the prior art, a jack is difficult to fix and fails are solved.

This invention relates to a fishing tool for well workover operations in oil and gas field exploration and development. It discloses a hands-free fishing barrel suitable for both mechanical and hydraulic dual-action. The barrel includes a shell assembly with a central connecting sleeve. An outer piston is fitted onto the outer circumference of the central connecting sleeve, forming a liquid-containing cavity I between the central connecting sleeve and the outer piston. An inner piston is fixedly connected to the central connecting sleeve via a shear pin. The upper ends of the central connecting sleeve and the inner piston enclose a liquid-containing cavity II. A slip and a milling shoe are fixedly connected to the lower end of the outer piston. After a ball is dropped into the neck of the central connecting sleeve, the fluid inside the tubing is pressurized. The fluid enters liquid-containing cavity I, pushing the outer piston upward and causing the slip to move upward. The fluid then enters liquid-containing cavity II, continuing to pressurize, causing the shear pin to break and the inner piston to move downward. This invention's hands-free fishing barrel, suitable for both mechanical and hydraulic dual-action, has a simple structure, is easy to operate, has high operational efficiency, and good performance.

The invention relates to the field of well cementation, and provides an induction type grading well cementation tool, grading well cementation equipment and a grading well cementation method.The induction type grading well cementation tool comprises a main shell, an induction type grading well cementation device and a grading well cementation method.The main shell is provided with a circulating hole penetrating in the radial direction; the inner sliding sleeve is arranged in the main shell, a first hydraulic cavity and a second hydraulic cavity are defined by the inner sliding sleeve and the main shell, and the inner sliding sleeve is provided with a radial through circulation opening; and the oil pump is communicated with the first hydraulic cavity and the second hydraulic cavity. According to the technical scheme, a shear pin is not needed, the problem that the pressure of the shear pin of a traditional grading well cementation tool is not accurate can be effectively solved, and well cementation accidents are avoided.

A barrier (10), comprising an elongate arm (12); a shaft (28) extendable through the arm (12) in orthogonal relationship thereto, the shaft (28) being rotatable with the arm (12) as a unit; a column (42, 33, 46) from which the shaft (28) is supportable, the column (42, 33, 46) having an internal chamber (70) through which a portion of the shaft (28) is extendable; and at least one shear-resistant structure positioned within the internal chamber (70) in shear-receiving relationship to the shaft (28). The shaft (28) extends through the arm (12) in orthogonal relationship thereto, the column (42, 33, 46) supports the shaft (28) and the at least one shear-resistant structure is positioned within the internal chamber (70) in shear-receiving relationship to the shaft (28). This shear-resistant structure help to dissipate shear energy that might be transmitted to the shaft (28) as a result of a vehicular collision with the arm (12). The shear-resistant structures include first and second shear plates (110, 112), which are threaded onto the shaft (28), and a shear pin (114), which extends orthogonally through the shaft (28).

The utility model belongs to the technical field of electronic aluminum foil casting equipment, and relates to an inner guide type oil cylinder shear pin type torque limiter which comprises a shell and a connecting piece, and the top of the shell is connected with jacked equipment; the connecting piece is arranged in the shell, and the lower portion of the connecting piece is fixedly connected to an oil cylinder plunger rod head flange. A cover plate is arranged on the upper portion of the connecting piece, and a shear pin is arranged between the cover plate and the connecting piece. And a transmission piece for transmitting torque is arranged between the cover plate and the shell. When the torque is larger, the shear pin is sheared off, so that the plunger rod of the oil cylinder below is protected from being affected by the torque, and an inner guide key and a key groove of the cylinder body in the oil cylinder are protected from being damaged.

The utility model provides a hydraulic spray gun for fracturing, and belongs to the technical field of underground mining equipment for promoting yield by forming cracks or cracks. The hydraulic spray gun for fracturing comprises a spray gun body, the spray gun body is provided with a spraying structure used for spraying fracturing fluid into a stratum, a sliding sleeve is arranged in the spray gun body, the end of the spray gun body is connected with a connector in a sealed mode, and a stopping step is arranged on the inner wall of one of the connector and the spray gun body. A shear pin seat is clamped between the other end face of the sliding sleeve and the stopping step, the shear pin seat is located on the inner side of the sealing connection portion of the spray gun body and the connector, a shear pin is installed on the shear pin seat, a ball seat is installed at the end of the sliding sleeve, an inner conical face used for being in contact sealing fit with a ball sealer is arranged on the ball seat, and a positioning groove is formed in the peripheral face of the ball seat. And the end part of the shear pin is inserted into the positioning groove. According to the utility model, after the shear pin is sheared off, fracturing fluid cannot leak to the outside through the position of the shear pin, and the jet fracturing effect of the jet structure is not influenced.

A hanger running assembly for a wellhead includes a hanger to support a casing. The hanger running assembly also includes a seal assembly with a push ring and a seal body to support one or more seal elements. The hanger running assembly further includes a torque tool coupled to the push ring via one or more shear pins, wherein rotation of the torque tool in a first direction while the one or more shear pins are intact causes rotation of the push ring in the first direction to thread onto the hanger.

This invention discloses a connection structure for a statorless disc generator coil, including a coil flange located at the center of the coil and a speed increaser flange located at the output end of the speed increaser. At least two sector-shaped bosses are evenly distributed around the center of the speed increaser flange on the end face of the speed increaser flange. Sector-shaped grooves matching the shape, position, number, and size of the sector-shaped bosses are provided on the mating end face of the coil flange. All sector-shaped bosses are embedded in the sector-shaped grooves to form radial and tangential constraints. At least two anti-shear pin holes are also paired on the speed increaser flange and the coil flange, and anti-shear pins are fitted into the anti-shear pin holes. This solution can effectively transmit torque, reduce bolt shear force, ensure high-speed rotational stability, and enhance impact resistance.

The invention relates to the technical field of sliding block fishing spears, in particular to a spear rod telescopic type sliding block fishing spear which comprises a shell, a sliding sleeve, a pawl, a spear rod, spear teeth and a control sleeve, the elastic pawl is arranged in the shell, a protrusion is integrally arranged on the outer side of the upper end of the pawl, a groove is formed in the position, corresponding to the protrusion, in the shell, and the sliding sleeve is arranged in the upper portion of the shell. The upper portion of the sliding sleeve is connected with the shell through a shear pin, the inner side of the lower end of the pawl is in threaded connection with a spear rod, the lower end of the spear rod is located below the shell, and the outer side of the lower portion of the spear rod is sleeved with a control sleeve. The device is reasonable and compact in structure and convenient to use, by arranging the sliding sleeve, the spear rod can slide downwards through ball throwing and pressing and pin shearing, the fish fixing structure moves upwards relative to the spear rod for diameter shrinkage, fish retreating is achieved, the pipe column does not need to be rotated, fish retreating operation can be achieved through pressing, and the device can be used for a vertical well. And the device can also be applied to fallen object salvage of highly-deviated wells and horizontal wells.

The utility model relates to the technical field of drilling-free devices, and discloses a falling half-stroke well cementation drilling-free device which comprises an upper connector, a lower connector is fixedly connected to one side of the upper connector, a closing sliding sleeve is slidably connected to the inner wall of the lower connector, a center pipe is slidably connected to the inner wall of the closing sliding sleeve, and a lower connecting sleeve is slidably connected to the inner wall of the center pipe. The outer wall of the lower connecting sleeve is slidably connected with a lower sliding sleeve, the outer wall of the lower sliding sleeve is attached to the inner wall of the lower connector, the inner wall of the lower connecting sleeve is slidably connected with an opening plug seat, and one side of the lower sliding sleeve is fixedly connected with a ball seat face. According to the drilling-free device, equipment is sealed through the sealing ball, the opening plug seat, the lower connecting sleeve and the center pipe are pushed by air pressure to respectively cut off the opening pin, the drilling-free pin and the shearing pin, so that the center pipe, the lower connecting sleeve and the lower sliding sleeve fall to the well bottom under the influence of gravity, and the drilling-free plug effect is achieved; and compared with traditional equipment, the efficiency and the safety of well cementation operation are greatly improved.

The application discloses a magneto, which comprises a shell, a magnetic core, a spring, a shear plate, a shear pin and a coil; the magnetic core is arranged in the shell; the spring is arranged between the magnetic core and the shell, and the lower end of the spring is abutted against the inner side surface of the shell; the shear plate and the guide cylinder are sleeved on the outer side surface of the magnetic core, and the upper end of the spring is abutted against the bottom of the shear plate; the shear pin is arranged on the shear plate and is inserted into the magnetic core; the magnetic core is cut off from the shear pin when moving downwards in the shear plate; the bottom of the shell is provided with the coil; the magnetic core enters the coil after being cut off from the shear pin, so that the coil generates an induced voltage. The magneto of the application can cut off the shear pin under the condition of low acceleration and long duration, and the magnetic core can pass through the coil under the guidance of the guide cylinder to generate an induced voltage, so that the purpose of triggering the magneto is achieved; the structure of the magneto is safe and reliable; the magneto is low in cost and can be triggered under specific conditions.

This invention relates to the field of downhole operation technology and is an intelligent floating casing installation device for well completion. It includes an outer mandrel, an inner sliding sleeve, shear pin assemblies, positioning steel balls, a measuring module, and a lower connector. An outer ring platform is located on the outer side of the middle portion of the outer mandrel, with at least two vertically penetrating cable grooves spaced along the upper side of the outer ring platform. The inner sliding sleeve is located inside the outer mandrel and is cylindrical with an upward-opening shape. At least two connecting holes are spaced along the lower outer side of the inner sliding sleeve, and an installation ring platform is located on the upper outer side of the inner sliding sleeve. The installation ring platform is fixedly installed to the outer mandrel by at least two shear pin assemblies, and has an installation cavity within it. This invention has a reasonable and compact structure, is easy to use, and, by incorporating a measuring module, can monitor the temperature and pressure of the bottom hole fluid during well completion and production. By installing cables within the cable grooves, bidirectional data transmission is achieved, enabling the integration of an intelligent well completion system. It is reliable, efficient, and intelligent.

The utility model discloses an oil passing pipe bridge plug tool, which comprises a central pipe, the upper cone assembly is arranged on the outer side of the central pipe in a sleeving manner; the upper slip is arranged on the outer side of the central pipe in a sleeving mode and located above the upper cone assembly; the outer sleeve assembly sleeves the outer side of the central pipe, and the lower end of the outer sleeve assembly is connected with the upper slip; the outer sleeve assembly is fixed to the center pipe through a shear pin, and after the shear pin is sheared off, the outer sleeve assembly can push the upper slip downwards, so that the upper slip abuts against the upper cone assembly, and expansion is completed. The rubber sleeve assembly sleeves the outer side of the central pipe, the upper end of the rubber sleeve assembly is fixed with the central pipe, and the lower end can axially move relative to the central pipe; the lower slip is arranged on the outer side of the central pipe in a sleeving mode and located below the rubber sleeve assembly. A bidirectional anchoring structure is adopted, bidirectional pressure difference can be borne, and the setting effect is improved.

The invention discloses a CJH type non-selective check valve which comprises a salvage neck, a valve body and a valve body. The downflow valve comprises a first cylinder and a second cylinder which are coaxially connected, the diameter of the second cylinder is larger than that of the first cylinder, and a limiting step is formed at the joint of the first cylinder and the second cylinder; wherein one end of the first cylinder is fixedly connected to the other end of the fishing neck; the valve bonnet is coaxially arranged on the down-flow valve in a sleeving mode and connected with the down-flow valve through a first shear pin; one end of the shaft sleeve is coaxially connected to the other end of the valve bonnet; an overflowing hole is formed in the shaft sleeve; the core shaft is of a hollow cylindrical structure; an O-shaped ring is installed on the inner wall of the mandrel and used for forming sealing with the second cylinder. The sleeve is arranged on the core shaft in a sleeving manner and is connected with the core shaft through a second shear pin; wherein one end of the sleeve is coaxially connected to the shaft sleeve; the lower connector is of a hollow cylinder structure, and one end of the lower connector is connected to the other end of the mandrel.

The invention relates to an underground pulse backflow sand prevention and plug removal device which comprises an energy storage pulse backflow plug removal device and a sand prevention assembly, the energy storage pulse backflow plug removal device comprises a hydraulic cylinder, a central circulation pipe and a high-pressure pulse reverse thrust mechanism, the central circulation pipe penetrates through the two ends of the hydraulic cylinder respectively, and the high-pressure pulse reverse thrust mechanism is arranged at the bottom end of the hydraulic cylinder; the high-pressure pulse reverse thrust mechanism comprises a plurality of nitrogen springs and a reverse thrust mechanism, the plurality of nitrogen springs are annularly arranged in the hydraulic cylinder, each nitrogen spring is connected with the high-pressure pulse reverse thrust mechanism through a hydraulic oil cavity, an end cover plate is exposed at the bottom end of the reverse thrust mechanism, and the central runner pipe is temporarily and fixedly connected with the end cover plate through a shear pin; the central runner pipe and the end cover plate are respectively provided with an oil inlet hole; the sand control assembly comprises a sand control screen pipe and an outer protection sleeve, the inner wall of the top end of the sand control screen pipe is arranged on the outer wall of a hydraulic cylinder of the energy storage pulse backflow plug remover in a sleeving mode, and the sand control assembly is used for being arranged underground; and the outer side of the sand control screen pipe is sleeved with the outer protective sleeve.

The utility model provides a large-diameter squat silo full-prefabricated segmented fragmented on-site pre-assembled integral assembly structure which is characterized in that the assembly structure comprises a plurality of layers of silo wall rings which are sequentially overlapped and spliced in the axial direction of a squat silo, each silo wall ring comprises a reference block duct piece, an assembly adjacent block duct piece and a top sealing block duct piece which are spliced in the circumferential direction, and the top sealing block duct piece and the reference block duct piece are spliced in the circumferential direction. A plurality of limiting inserting ribs are pre-embedded in the circumferential direction of the top face of each silo wall ring at intervals, hoisting limiting holes corresponding to the limiting inserting ribs are formed in the circumferential direction of the bottom face of each silo wall ring, the limiting inserting ribs between the adjacent layers of silo wall rings are inserted into the hoisting limiting holes, and shear pins are arranged between the adjacent layers of silo wall rings. The utility model has the advantages that the silo wall of the squat silo is prefabricated on site in a segmented and segmented manner, and hoisting alignment is carried out by utilizing the hoisting limiting holes and the limiting joint bars which are arranged on the ring surface of the silo wall ring in the hoisting process, so that the hoisting process can be facilitated, the construction efficiency can be accelerated, and the construction quality can be ensured.

The application discloses a high-pressure wellhead lock ring releasing tool and a use method thereof. The tool comprises a mandrel, a lower end of which is connected with an extended short drill rod; an outer cylinder is arranged on the outer periphery of the mandrel; an upper end of the outer cylinder is fixedly provided with an upper cover, a through hole which is matched with the outer periphery of the mandrel is arranged in the center of the upper cover; the outer cylinder is detachably connected with the mandrel; a plurality of connecting bolts are uniformly arranged on the inner wall of the lower part of the outer cylinder in the circumferential direction; an inner cylinder is provided with an insertion part which is used for being inserted into the lower part of the outer cylinder; a plurality of J-shaped grooves are uniformly arranged on the upper edge of the insertion part in the circumferential direction respectively, and the positions and the number of the plurality of J-shaped grooves are matched with those of the plurality of connecting bolts; a lock ring pressing cylinder is fixedly connected with the lower edge of the inner cylinder; and a plurality of elastic shear pins are arranged on the inner periphery of the lower part of the inner cylinder in the circumferential direction. The tool has the beneficial effect that the lock ring arranged in the annulus between the low-pressure wellhead and the high-pressure wellhead can be pressed down, so that the high-pressure wellhead is separated from the low-pressure wellhead.

The utility model discloses a shearing disc for a soluble ball seat, connection between a releasing lever and the ball seat can be achieved by using the shearing disc and matching with a connecting assembly, and a plurality of open grooves and open holes are formed in a round disc body. After the releasing rod is pulled to enable the shearing disc to be sheared along the distance between the open groove and the open hole, the remaining parts are dispersed into a plurality of parts, so that drilling, grinding and flowback are facilitated, a large number of shearing pins do not need to be used for installation during installation, installation is more convenient and simpler, and improvement of working efficiency is facilitated. The disc comprises a round disc body, the round disc body is provided with an open hole, the open hole is formed in the center of the round disc body, the round disc body is provided with a plurality of open grooves, the open grooves are evenly distributed in the round disc body, and a preset distance is formed between the first surface in each open groove and the corresponding open hole.

A lawnmower is equipped with a shear pin to prevent the blade from breaking when a load is applied, thereby damaging other parts. By storing a spare shear pin near the mulching cover attached to the upper front part of the blade, it can be quickly replaced if the shear pin breaks. However, because the spare shear pin is located at the front of the deck, and because the mulching cover is removed from the deck during mulching work, it is exposed to rain, dust, etc., and there is a risk of it rusting. Therefore, we provide a lawnmower that can protect the spare shear pin from rain, dust, etc. [Solution] In a grass cutter equipped with a mower unit on a traveling body 2 fitted with a driver's seat 5 in which an operator can sit, a shear pin stock section 30 is provided below the driver's seat 5 to store spare shear pins to be replaced when the shear pin breaks.

The invention relates to the field of packers, in particular to a multi-point release type expansion packer, and aims to relieve the technical problem of incomplete unsealing of the expansion packer in the prior art. The multi-point release type expansion packer comprises a central pipe, a connecting sleeve, an expansion rubber sleeve and a supporting sleeve. The central pipe is composed of a first connecting section, a second connecting section, a third connecting section and a fourth connecting section. A pressure transmitting hole is formed in the side wall of the first connecting section; the central pipe is sleeved with the connecting sleeve, one end of the connecting sleeve is connected with the central pipe through a shear pin, a first boss is formed on the inner wall of the connecting sleeve in a protruding mode, and the first boss is in sealing fit with the outer wall of the first connecting section; one end of the expansion rubber sleeve is in threaded connection with the other end of the connecting sleeve; the supporting sleeve is sleeved on the central pipe, is in sealing fit with the outer wall of the third connecting section and is in threaded connection with the other end of the expansion rubber sleeve. After the multi-point release type expansion packer is unsealed, pressure relief channels are formed at the upper end and the lower end of the expansion rubber sleeve, and therefore it can be guaranteed that pressure is completely released.

The invention relates to the technical field of entrance and exit control and security facilities, and discloses a power failure self-descending type lifting column control system for fire emergency, which comprises a lifting column body, a hydraulic power unit and an environment sensing type electric cabinet. A hydraulic trigger type electrical physical isolation module is arranged in the electric control box and is connected in series with a power supply loop, and system pressure is utilized to drive contacts to be closed to realize voltage loss, namely power failure. The hydraulic power unit comprises a hot melting hydraulic shearing interlocking electromagnetic valve, an SMA shearing pin is integrated in the hydraulic power unit, and the hydraulic power unit is fractured at high temperature to synchronously relieve valve element mechanical locking and cut off a coil loop. Through linkage of the thermosensitive element and the hydraulic isolation module, the problem that the electromagnetic valve loses efficacy and is stuck at high temperature is solved; the pulse energy storage device is used for releasing instantaneous pressure pulses to overcome static friction force, and the hovering risk during gravity descending is eliminated; and the throttling section is adjusted in a self-adaptive mode through the thermal compensation throttling valve, descending stall caused by oil liquid thinning at the high temperature is prevented, and the reliability of fire emergency response is improved.

In order to overcome the poor durability problem faced by the existing reinforced concrete components used for offshore floating structures, the application provides a FRP-concrete structure, a floating unit, a floating platform and a construction method thereof; the FRP-concrete structure comprises an FRP component, a plurality of shear pin assemblies and a concrete layer, the plurality of shear pin assemblies are arranged in the FRP component, the concrete layer is filled in the FRP component, the shear pin assembly comprises a shear pin and a fiber bundle, one end of the fiber bundle is arranged in the interior of the shear pin, and the end of the fiber bundle away from the shear pin extends out of the shear pin and is connected with the FRP component. The FRP-concrete structure provided by the application has high strength, strong bearing capacity and good durability.

The present application relates to oil and gas field downhole fracturing tool technical field, specifically to a kind of pressure difference sliding sleeve and method for use, pressure difference sliding sleeve includes the upper joint, cylinder sleeve, lower joint connected in sequence, center tube is arranged in the cylinder sleeve, the center tube and cylinder sleeve form sealed hydraulic drive cavity, piston is arranged in the sealed hydraulic drive cavity and slides axially, the cavity wall of sealed and sealed hydraulic drive cavity sealing cooperation, shear pin is fixedly arranged on the center tube and / or cylinder sleeve, the piston is axially fixed by shear pin, the first flow-through hole and the second flow-through hole are respectively opened in the cylinder sleeve and center tube at piston, the piston is closed between the first flow-through hole and the second flow-through hole, threaded through-hole is opened on the center tube, the threaded through-hole is communicated with sealed hydraulic drive cavity, rupture disc is fixedly arranged in the threaded through-hole.The present application can realize sliding sleeve full-automatic opening by only pressing in wellhead pipe, without auxiliary operation such as ball.

The invention belongs to the technical field of petroleum well repair, and discloses a high-temperature thermal production well under-pressure plugging, filling and injecting integrated tool and a using method thereof. Comprising a connector, a plugging device, a filling cylinder, a shear pin, a connecting coupling and a preset plugging cylinder. Liquid can be pumped in through the oil pipe, the plugging device at the joint is broken through, and'sand filling plugging 'can be implemented until a well section needing to be plugged in a well is completely plugged and qualified without pulling out a pipe column, lowering a sand filling pipe again and carrying out sand filling construction. A large amount of time for replacing downhole tools, lifting and pipe columns is saved, the construction efficiency is greatly improved, and the one-time success rate and the difficulty of plugging construction of well sections with seriously damaged high-temperature steam injection well sleeves are greatly improved.