111 results about "Blowout preventer" patented technology

One form of this technology includes a sealing structure for sealing around the user's airway against the user's face. The sealing structure includes a sheet or membrane extending inward toward the user's airway and includes a structure that prevents the inner boundary of the sheet or membrane from being ejected outward due to internal pressure (e.g., folded back onto itself).

The utility model discloses a variable diameter blowout preventer pipe relates to wellhead sealing blowout preventer technical field, and its technical key points include main pipeline, the top of main pipeline installs first variable diameter pipe, the top of first variable diameter pipe installs second variable diameter pipe, the top of second variable diameter pipe installs the top pipe, the utility model discloses when using, realized through variable diameter pipe group and realized the passage diameter adaptation, and pressure sensor and blowout preventer valve guarantee safety, with the help of flange, U -shaped clamping plate and locking assembly, realize quick firm connection with least three bolts, trapezoidal positioning structure realizes pipeline accurate butt joint, and the overall operation efficiency, safety and convenience are improved.

This invention discloses a remote automatic locking system for a gate blowout preventer, comprising a shaft seat, the first end of which is bolted to the gate blowout preventer and corresponds to the gate shaft; the inner wall of which has an internal thread; a reduction mechanism, comprising a housing and a hollow output shaft; one side wall of the housing is fixed to the second end of the shaft seat; the hollow output shaft is rotatably connected inside the housing and its axis corresponds to the gate shaft; a drive mechanism, fixed to the outer wall of the housing and its drive shaft is drivingly connected to the hollow output shaft; and a locking mechanism, comprising a torque slide rod and a locking shaft; the torque slide rod is assembled in the hollow cavity of the hollow output shaft and can rotate synchronously and move linearly with the hollow output shaft; the locking shaft is assembled in the shaft seat and coaxial with the torque slide rod, and its outer wall has an external thread that meshes with the internal thread; one end of the locking shaft is fixed to the torque slide rod, and the other end can abut against the gate shaft. This invention solves the problems of high labor intensity, low operating efficiency, and poor personnel safety in existing blowout preventer locking devices.

A lock sequencing system includes a first fluid line that couples a fluid source to a first portion of a piston cavity of a blowout preventer and to a hydraulic motor of a lock. A first discharge valve is positioned along the first fluid line to delay delivery of fluid to the hydraulic motor of the lock to cause sequential closure of a ram coupled to the piston and locking of a lock member of the lock. The first discharge valve is configured to isolate the first fluid line from the fluid source and couple the first fluid line to a drain reservoir.

The present application relates to the technical field of coal mine drilling, and particularly discloses a mine drilling and boring blowout prevention device, which comprises a sleeve, one end of which is connected with a contact ring, and the other end is connected with a buffer cover, the buffer cover is provided with a gas extraction opening and a discharge opening; a sliding plate and a mounting plate, the sliding plate is movably arranged in the sleeve, the mounting plate is fixedly arranged at the connecting end of the sleeve and the buffer cover, the sliding plate and the mounting plate are connected through an elastic member, the sliding plate is provided with a guide pipe, the mounting plate is provided with a fixed pipe, the guide pipe and the fixed pipe are slidably connected, and the fixed pipe is provided with a rotating plate; the guide pipe is moved in the fixed pipe by the buffer plate, the elastic member is used for buffering the gas, the buffer cover is arranged to make the gas enter the large space of the buffer cover from the small space of the guide pipe, the flow rate of the gas is reduced, the impact on the equipment is reduced, and the stability of the equipment is improved.

The present disclosure relates to the technical field of nondestructive testing, and one embodiment of the present disclosure provides an elliptical inner cavity magnetic powder detection device, which comprises a blowout preventer, a first inner cavity is formed in the blowout preventer, and the device further comprises a fixing ring, a fixing rod, a plurality of support plates and a plurality of support fixing members; the bottom end of the fixing ring is threadedly connected to the top end of the blowout preventer; a reinforcing frame is fixedly connected to the fixing ring; one end of the fixing rod is fixedly connected to the bottom end of the reinforcing frame; the plurality of support plates are arranged in the first inner cavity through an adjusting mechanism; the adjusting mechanism is used for adjusting the distance between the support plates and the first inner cavity; and the support fixing members are arranged on the outer side walls of the support plates and used for fixing wires on the outer side walls of the support plates. Through the above technical solution, the technical problem that the inner cavity of the blowout preventer is difficult to be effectively circumferentially magnetized and transverse defects are difficult to be detected due to the structural limitation of the magnetic powder detection in the prior art is solved.

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.

This invention proposes a blowout preventer (BOP) arrangement design method. The lower BOP and lower riser assembly are vertically arranged on the same sidewall of the moonpool, perpendicular to the ship's length direction, using a fixing device. A lower BOP base and a lower riser assembly base are respectively connected below the lower BOP and lower riser assembly. Pressure testing pipelines and corresponding interfaces are provided around the lower BOP and lower riser assembly for BOP pressure testing operations. This invention can be disassembled and arranged separately or assembled as a whole for interchangeable arrangements; it can perform pressure testing and maintenance operations at a single storage location or simultaneously at two storage locations.

The application discloses a kind of well down oil and gas exploration borehole gas content monitoring blowout preventer system and its use method, and monitoring blowout preventer system includes blowout preventer, and the blowout preventer is provided with gas inlet end and gas outlet end, and the gas inlet end is coaxially communicated with the exploration borehole hole sealing casing arrangement;Gas outlet end is coaxially connected with pneumatic locking device, and the pneumatic locking device is connected with downhole air pressure device by hose;Blowout preventer is also connected with residue pipe and gas extraction connecting pipe, and the extraction connecting pipe is provided with monitoring gas inlet and monitoring gas outlet, and the monitoring gas inlet and monitoring gas outlet are communicated by monitoring pipeline, and the monitoring pipeline is provided with methane sensor.The application is designed by structure and set monitoring threshold value, ensures that the gas that gushes in hole can only flow to extraction system through extraction connecting pipe, and then is discharged by extraction pump station, ensures that the gas of blowout preventer does not overflow operating environment, avoids environmental gas over-limit.

This utility model discloses a monitoring device for gas emission from mine boreholes, belonging to the field of drilling technology. It includes a blowout preventer, a drill rod, and a dust suppression component. One end of the blowout preventer is fixedly connected to an inclined slag discharge port. The drill rod extends through through holes on both sides, and sealed airbags are respectively provided at the through holes on both sides of the blowout preventer. An orifice spray head is fixedly connected to the slag discharge port, and the orifice spray head is perpendicular to the slag discharge port. This utility model can effectively remove dust mixed in with gas.

The application belongs to the technical field of petroleum drilling equipment, and discloses a combined blowout preventer pressure testing device and a use method. The combined blowout preventer pressure testing device comprises a pressure testing blind plate guide shoe and a pressure testing blind plate simulated drill string. The pressure testing blind plate guide shoe comprises an automatic guide mechanism, a centering mechanism, a pressure testing blind plate, a connecting groove, a water pressure interface, a pressure relief port and a sealing steel ring groove. The automatic guide mechanism is fixed to the top of the centering mechanism. The centering mechanism is located at the top of the pressure testing blind plate. The connecting groove is arranged at the center of the automatic guide mechanism and the centering mechanism. The lower end of the pressure testing blind plate simulated drill string is detachably arranged in the connecting groove. The water pressure interface and the pressure relief port are arranged in the centering mechanism and the pressure testing blind plate. The sealing steel ring groove is arranged on the upper end surface of the pressure testing blind plate. The combined blowout preventer pressure testing device is stable and reliable, can cover all specifications of blowout preventers, is convenient and fast to operate, saves time and effort, has high dismounting and mounting efficiency, and has small operation risk.

The utility model relates to the technical field of blowout preventer, specifically relates to a hydrogeological exploration borehole blowout preventer, including the drill rod, the pipe body of drill rod is provided with the pressure relief pipe, the lower extreme fixedly connected with the drill bit of drill rod, still include the two mounting brackets of symmetrical settings, the opposite end of two mounting brackets all are established to have the lifting groove, the screw rod is rotatably arranged in the lifting groove. The utility model discloses screw rod drive compares traditional electric push rod, and the screw thread cooperation of double screw rod and lifting plate compares electric push rod, and the ability of resisting lateral force is stronger, can still keep the drill rod steady lifting under the complex geological condition, has higher stability and precision, can ensure that the drill rod lifting process is stable, reduces the drilling deviation caused by the sway, through the bevel gear transmission system, realizes the synchronous distribution of lifting and rotating power, reduces the motor number, reduces the equipment cost and energy consumption.

The application discloses a blowout preventer with a wide flange body, and belongs to the technical field of well drilling. The blowout preventer with a wide flange body and a use method thereof comprise a drilling hole, a blowout preventer body and a wide flange body, the blowout preventer body is installed at the top of the drilling hole, the wide flange body is arranged at the top of the blowout preventer body, an activity cavity is arranged in the blowout preventer body, a steel shear is movably connected in the activity cavity, a steel shear connected with an electric telescopic rod is arranged in the blowout preventer body outside the activity cavity, a first fixing plate is arranged at the top of the inner wall of the activity cavity, a bidirectional screw rod is arranged on the inner side of the first fixing plate, and a U-shaped piece is movably connected to the surface of the bidirectional screw rod. The blowout preventer with a wide flange body can limit the drilling pipe, avoids the leakage caused by the damage of the inner wall of the drilling hole due to the inclination of the drilling pipe when the drilling pipe is cut by the steel shear, can realize the connection between the steel shear and the first limiting ring according to the requirement, and facilitates the post-treatment after the sealing of the drilling hole.

This invention relates to the field of oilfield well workover, and discloses an automatic well sealing switch device and well workover operation equipment. The automatic well sealing switch device includes a height adjustment mechanism, a rotation mechanism, a telescopic mechanism, and an automatic switching mechanism; the height adjustment mechanism includes an adjustment cylinder, an adjustment cylinder, and a support rod; the rotation mechanism is connected to the upper end of the adjustment cylinder; the telescopic mechanism is arranged laterally; the automatic switching mechanism includes a fixed outer sleeve, a lifting cylinder, a lifting outer sleeve, an outer cylinder, an outer cylinder end cap, a well sealing end cap, a guide rod, a suspension blowout preventer short connector, a variable-strut short connector, a lower section short connector, an upper spring sealing sleeve, an upper spring, a bearing, a short connector connecting sleeve, and a lower spring. This invention replaces the traditional rotary valve with an automatic well sealing switch device, achieving rapid well control and emergency blowout control in automated operations, ensuring operational safety; through the reasonable layout and coordinated actions of each mechanism, efficient automatic well sealing is achieved, saving manpower and time.

This utility model relates to a ring-shaped blowout preventer (BOP) assembly / disassembly device, belonging to the field of BOP technology. The ring-shaped BOP assembly / disassembly device includes a base plate and a support. The base plate is used to place and fix the BOP. The support is placed on the base plate and has a liftable mounting plate. The mounting plate has a positioning component, a disassembly component, and a lifting component. The positioning component is slidably mounted on the mounting plate and is used to clamp the BOP for positioning. The disassembly component is rotatably mounted on the mounting plate and includes at least two electric wrenches for loosening and assembling bolts. The lifting component is used to hook the upper housing of the BOP. The positioning component clamps the BOP, achieving centering and positioning between the support and the BOP. The disassembly component can simultaneously loosen and assemble two or more bolts. The disassembly component rotates to connect the electric wrenches to bolts at different positions, thereby loosening and assembling all bolts. The lifting component lifts the upper housing of the BOP.

This invention relates to the field of oilfield well workover technology, specifically to a continuous sand flushing process string, comprising: a conversion joint threadedly connected to the lower outer side of a single tubing section, the lower part of which is inserted and fixedly connected to the upper inner side of the tubing inside the well; a blowout preventer (BOP) sealed and fixed to the lower side of a self-sealing fluid inlet device by a steel ring, and a large four-way valve sealed and fixed to the lower side of the BOP by a steel ring; and a process pipe threadedly inserted and fixed to the lower part of the inner cavity of a special hanger. Through the overall structure of the equipment, the well-washing fluid enters the sand flushing string through the inlet of the self-sealing fluid inlet device, the annular space, and the radial water hole. The returning sand-carrying fluid flows through the second annular space and the return fluid outlet of the large four-way valve to the surface collection tank. Well washing cannot be stopped during the sand flushing process. After the well is cleared, the string is lowered, and the lowering speed is controlled, enabling continuous sand flushing. This reduces labor intensity, ensures safe and fast sand flushing, and improves operational efficiency and safety.

A retrieveable and drillable tubing-type wellbore isolation device belongs to the field of oilfield downhole tool technology. This utility model includes, from top to bottom, a tubing assembly, an anchoring and sealing assembly, and a blowout preventer (BOP) bottom valve assembly connected sequentially. The tubing assembly includes a coupling, a protective cap, and a tubing; the outer side of the coupling is threaded to the protective cap, and the inner side is threaded to the upper end of the tubing. The anchoring and sealing assembly includes a central tube, and a setting mechanism, an anchoring mechanism, a sealing mechanism, and a releasing mechanism fitted around the central tube. The BOP bottom valve assembly includes a lower short connector, a BOP sleeve, and a sealing sleeve; the lower short connector is threaded to the sealing sleeve, and the sealing sleeve contains a sealing rubber sleeve. The tubing can be inserted into the anchoring and sealing assembly and the BOP bottom valve assembly, forming a sealing fit with the sealing rubber sleeve. This utility model enables stratified oil production with a single tubing string run, effectively isolates oil layers during pump inspection, and has both retrieveable and drillable retrieval methods, greatly improving operational efficiency and safety.

This utility model discloses a hydraulic locking device for a gate blowout preventer, relating to the field of oil drilling and production technology. It includes a gate blowout preventer, a locking shaft and a cylinder liner mounted on the gate blowout preventer. Its key feature is that it also includes a main unit mounted on the gate blowout preventer. The main unit includes a hydraulic motor fixedly connected to the cylinder liner via a motor connecting sleeve. The rotor of the hydraulic motor has a hollow structure, and a drive sleeve is coaxially driven within the rotor. A drive rod is coaxially slidably fitted within the drive sleeve, with both ends of the drive rod passing through both ends of the drive sleeve. One end is fixedly connected to the locking shaft, and the other end is fixedly connected to a manual operating lever. The advantages of this utility model are: by adopting an external modular design, it eliminates the need to modify the original blowout preventer structure. Through the motor connecting sleeve and quick fixing to the cylinder head, and the direct connection of the drive rod to the original locking shaft, the manual locking blowout preventer can be quickly upgraded to a hydraulic locking mode, significantly reducing the difficulty, time, and cost of retrofitting existing equipment.

A technique facilitates reliable operation of a blowout preventer (BOP) system in a wide range of challenging environments. The BOP system is an electrical system comprising electrically powered components. The electrically powered components are connected with a primary energy storage device which provides electric power for operating those components. Additionally, a secondary energy storage device may be connected to the primary energy storage device in a manner so as to maintain a desired level of charge on the primary energy storage device. The secondary energy storage device has a longer lifespan and a lower discharge rate compared to the primary energy storage device. By way of example, the secondary energy storage device may be in the form of a secondary battery which is nuclear powered.

This invention provides a construction method for deep exploration well testing, relating to the field of deep exploration well testing technology, including: Step 1, installing and pressurizing a test blowout preventer (BOP) assembly, and performing well cleaning operations after the pressure test is passed; Step 2, performing perforation operations using a tubing-transfer perforation method; Step 3, removing the perforation tubing; Step 4, running in a combined stimulation-testing process tubing; Step 5, disassembling the test BOP assembly and installing a gas production wellhead; Step 6, performing test extrusion and acidizing operations; Step 7, performing fluid drainage, sampling, and production assessment; This method solves the problems of low success rate, long construction period, and high construction cost in existing deep exploration well testing construction techniques.

This invention discloses a low-pressure gas well fluid retrieval device and method, including a base with a platform having a through hole. A support frame, winch, and explosion-proof control cabinet are fixedly installed on the platform. A top pulley is connected to the top of the support frame, and a load sensor is installed inside the pulley shaft. The support frame is connected via a connecting pipe clamp to a blowout preventer (BOP) assembly that vertically passes through the through hole. An electronic pressure gauge is installed on the outer wall of the BOP assembly. A sealing device and a buffer device are installed inside the BOP assembly from top to bottom. The lower end of the BOP assembly is connected to the BOP via a union. The winch includes a drum and a motor, with the drum coaxially connected to the motor. One end of a steel wire rope is wound around the drum, and the other end passes over the top pulley and connects to the fluid retrieval tool. A data acquisition device is installed on the drum. This invention can monitor the gas well pressure to start and stop equipment and perform fluid retrieval operations, enabling water-flooded gas wells to quickly resume production, reducing operating costs and labor intensity. Furthermore, the fluid retrieval device can be moved to different wellheads for repeated fluid retrieval work, reducing the cost per well.

The utility model discloses a kind of efficient sealing blowout preventer of oil production well, including blowout preventer body, the top of the blowout preventer body is fixedly connected with top mouth, the bottom of the blowout preventer body is fixedly connected with bottom pipe mouth, the outer wall of the bottom pipe mouth is fixedly connected with installation flange. The utility model can make that the efficient sealing blowout preventer of oil production well is more convenient to use, can limit the butt joint mouth position when the blowout preventer and wellhead butt joint first, staff does not need to check whether to align each screw hole from beginning, to reduce the working difficulty of overall work, reduce the working complexity of staff, improve the installation efficiency of overall installation work, speed up the working process of subsequent work, it is favorable to the quick installation of efficient sealing blowout preventer.

This utility model provides a connection device for an oil blowout preventer (BOP), relating to the field of petroleum machinery. Its key technical features include a BOP body installed on an oil well, and a pulley mounted on the BOP body for use with a winch to pull downhole tools in and out of the well. A clamping assembly for securely mounting the pulley is detachably connected to the BOP body. The clamping assembly includes an upper clamping part, a lower clamping part, and a holding part. The holding part is located on the same side as the upper and lower clamping parts and holds them together to securely restrain them on the BOP body. The technical advantage is that it enables rapid installation of the BOP body and forms a stable mounting structure for the pulley, providing stable support and making the pulley more stable during use. The pulley can be used without installing it on a blowout preventer box or BOP.

The utility model relates to the technical field of coal mine drilling, especially to a downward drilling blowout preventer, including sleeve pipe, box, deslagging pipe and air pipe, the sleeve pipe rear end with the sleeve pipe hole of box front end middle part link to each other, the box bottom is connected with the deslagging pipe, the top of box is equipped with the air pipe, the front side inner wall of box top is equipped with first baffle, the back side inner wall of box top is equipped with second baffle, the first baffle's inner end is located the top of sleeve pipe hole, second baffle is located the top of first baffle, the utility model discloses a first baffle is arranged on the top of sleeve pipe hole, and the second baffle is arranged on the back end of the inner wall of box, so that the air pipe and the sleeve pipe hole are enclosed into the air channel of the "Z" shape through the first baffle and the second baffle, so that the air pipe can simultaneously harmful gas such as gas, avoid too much drilling slag to inhale into the air pipe, lead to the problem such as air pipe blockage.

The utility model relates to a blowout preventer for well mouth belongs to petroleum exploitation equipment technical field, including casing, piston, conical rubber core, upper pressure seal oil cavity, lower pressure loose oil cavity, upper pressure oil plug and lower pressure oil plug, the casing top is equipped with the cover plate of compacting conical rubber core, the piston inner hole is equipped with the support cylinder, the lower part inner hole of support cylinder is equipped with the embedded recess, the embedded recess is equipped with the centralizing copper bush, the lower part inner hole outside of casing is equipped with the support recess of locating support cylinder and centralizing copper bush bottom, the inner wall of support cylinder is equipped with cooling liquid cavity, the lower part outside wall of casing is equipped with cooling liquid inlet plug and cooling liquid outlet plug, and the inner end of cooling liquid inlet plug and cooling liquid outlet plug all are screwed in the mounting hole of support cylinder and communicate cooling liquid cavity. The utility model discloses centralizing copper bush can support and right the oil rod in the lower part, prevent deflection, can take away the heat generated when blowout preventer works in time, guarantees equipment to work under the suitable temperature, improves the performance stability.

This utility model discloses a bell-shaped connection device for workover rigs. The device includes a first connecting assembly and a second connecting assembly. The first connecting assembly includes a first telescopic adjustment pipe, a main return pipe, and a flexible rubber joint connected sequentially. The first telescopic adjustment pipe is connected to the side of the expansion section of the bell-shaped opening, and the flexible rubber joint is used to connect to a mud collection device. The second connecting assembly includes a second telescopic adjustment pipe, the first end of which is connected to the second connecting section of the bell-shaped opening, and the second end of which is used to connect to a blowout preventer assembly. This bell-shaped connection device for workover rigs is easy to install on-site, reliable in operation, and adaptable to various adjustment scenarios.

The utility model relates to annular preventer technical field, specifically disclose a combination type annular preventer sealing rubber core, including the upper rubber core subassembly, the bottom surface connection of upper rubber core subassembly has the sealing strip, the upper surface of upper rubber core subassembly is equipped with two groups of through -hole, the top of upper rubber core subassembly is equipped with two groups of locking assembly, the below of upper rubber core subassembly is equipped with lower rubber core subassembly, the upper surface of lower rubber core subassembly is inlayed with two groups of thread cylinder, the upper surface of lower rubber core subassembly is equipped with sealing recess. Through the adaptability of sealing strip and sealing recess, it is convenient to primarily enhance the sealing between upper rubber core subassembly and lower rubber core subassembly, prevent fluid from the leakage of both junctions, utilize the upper support ring to provide structural support for the upper rubber sealing body, through the lower support ring to provide structural support for the lower rubber sealing body, and further ensure that when bearing pressure, the upper rubber sealing body and the lower rubber sealing body can keep stable form.

The utility model discloses a kind of top drive inner blowout preventer actuator, it is related to top drive inner blowout preventer technical field, including IBOP oil cylinder, IBOP roller assembly, drive structure, inner blowout preventer;The utility model drive ring and IBOP roller adopt rolling contact, roller can freely roll in the groove of the outer wall of drive ring, automatically compensate the installation deviation of top drive main shaft and wellhead center and radial displacement in operation, ensure that rack and pinion always keep correct meshing, avoid lateral force and jam, realize 100% reliable opening and closing;IBOP roller assembly is built-in spring seat, spring and spring press cover, form axial elastic buffer;Overall using the modular design of "over oil cylinder+roller drive+rack and pinion", only need to fix bracket on top drive shell, adjust rack meshing gap can complete installation, without tedious calculation to connecting rod length, applicable to almost all models of top drive inner blowout preventer, and strong universality.

The invention discloses pressure-bearing alloy steel, a heat treatment method and an ultra-deep well blowout preventer pressure-bearing part applying the pressure-bearing alloy steel, and belongs to the technical field of metal materials. The heat treatment method of the pressure-bearing alloy steel comprises the following steps that two-phase region quenching is carried out, the quenching temperature is 830-890 DEG C, and water cooling is carried out after two-phase region quenching; and after water cooling is completed, tempering treatment is carried out, and the tempering temperature is 610-670 DEG C. The invention further discloses pressure-bearing alloy steel and an ultra-deep well blowout preventer pressure-bearing piece. According to the heat treatment method of the pressure-bearing alloy steel, a soft-phase ferrite structure is introduced into an original single bainite structure through two-phase region quenching, meanwhile, the proportion between the quenched ferrite and bainite is regulated and controlled, in the plastic deformation process, the soft-phase ferrite firstly yields, and then the bainite firstly yields; and in the further deformation process, the hard-phase bainite provides tensile strength, and through the synergistic effect of the soft phase and the hard phase, the pressure-bearing alloy steel can keep certain plasticity and toughness and meanwhile has high strength.

This utility model provides an integrated emergency bottom flange, including an upper connecting flange, a slip seat, a tapered slip assembly, a sealing rubber sleeve, and a rubber sleeve cap. The slip seat has an inverted conical hole for installing the tapered slip assembly and an annular stepped hole for installing the sealing rubber sleeve. The sealing rubber sleeve is equipped with double rubber seals. The rubber sleeve cap is connected to the slip seat and is used to tighten the sealing rubber sleeve. This utility model improves sealing reliability by designing a BT seal and a three-stage sealing barrier with a double-stage sealing rubber sleeve. It allows for casing sealing pressure testing before well shut-in, and can inject grease to achieve secondary sealing in case of leakage during operation. The main sealing rubber sleeve can be replaced separately if it fails. The integrated emergency bottom flange and the wellhead blowout preventer are installed as a single unit, which is more convenient and faster than traditional bottom flange installation, greatly shortening the emergency installation time and improving the success rate of emergency repairs.