A high-temperature blowout preventer full seal device

Abstract

The application discloses a high-temperature blowout preventer full sealing device, which comprises a shell, a gate plate assembly and a driving device, a center passage perpendicular to the length direction of the shell is arranged in the middle of the shell, the gate plate assembly is arranged in the shell and comprises left and right gate plates oppositely arranged along the length direction of the shell, and the left and right gate plates are driven to synchronously move oppositely by the same driving device; when the left and right gate plates move to a first state, the left and right gate plates close the center passage; and when the left and right gate plates move to a second state, the center passage is opened. The driving mechanism such as a hydraulic cylinder is separated from the blowout preventer body, steam (or liquid in a well) and hydraulic oil are prevented from being mixed, and the steam temperature is prevented from being conducted to the hydraulic cylinder to make the hydraulic oil overheat.

Description

Technical Field

[0001] The present invention relates to the technical field of thermal recovery operations, and in particular to a high-temperature blowout preventer full sealing device. Background Art

[0002] A blowout preventer is a protective device used in oil and gas extraction. It is installed on the wellhead and can close the wellhead in time. It prevents underground oil layer fluid from spraying out of the well under pressure during oil well operation or drilling, causing blowout accidents.

[0003] The single-gate fully sealed blowout preventer currently used in oil well operations adopts a structural mode in which a hydraulic cylinder is respectively provided on the left and right sides and a pair of left and right gates are provided inside the blowout preventer. The hydraulic cylinders on the left and right sides are relatively independent, and the left and right gates are also relatively independent. This results in that the synchronous movement of the left and right gates in the horizontal or vertical directions during the closing process of the gates cannot be guaranteed, resulting in relative movement of the side sealing end faces or the upper sealing end faces of the gates during the sealing process, affecting the sealing effect; since the hydraulic cylinder is provided on the blowout preventer body to form an integral structure therewith, the steam temperature will be directly transmitted to the hydraulic cylinder, causing the hydraulic oil temperature to overheat, resulting in damage to the hydraulic cylinder. In addition, since the hydraulic cylinder inner cavity and the blowout preventer inner cavity are connected by a hydraulic cylinder piston rod, and the two are sealed and isolated by a seal, once the seal leaks, steam (or liquid in the well) will enter the hydraulic cylinder and contaminate the hydraulic oil; in particular, since the left and right gate seals are made of rubber parts, even if they are made of high-temperature resistant rubber sealing materials, The highest temperature resistance can only reach 327°C, which cannot meet the sealing requirements under 350°C environment. Therefore, for the operating wellhead with steam injection at 350°C, the existing blowout preventer cannot meet the requirements.

[0004] Based on this, the existing technology still needs to be improved. Summary of the Invention

[0005] To solve the above technical problems, an embodiment of the present invention proposes a high-temperature blowout preventer full sealing device to solve the technical problem that the blowout preventer in the prior art cannot meet the requirements of 350°C high-temperature steam injection operations.

[0006] A high-temperature blowout preventer full sealing device disclosed in an embodiment of the present invention includes a housing, a gate assembly, and a drive device.

[0007] The middle of the shell is provided with a central channel perpendicular to the length direction of the shell.

[0008] The gate assembly is arranged in the housing, and includes a left gate and a right gate that are arranged opposite to each other along the length direction of the housing. The left gate and the right gate perform relative or opposite synchronous motion under the drive of the same driving device;

[0009] When the left gate plate and the right gate plate move to the first state, the left gate plate and the right gate plate close the central channel;

[0010] When the left gate and the right gate move to the second state, the central channel is opened.

[0011] Furthermore, a side sealing groove is provided on the side of the left gate plate close to the right gate plate, and a side sealing block is provided on the side of the right gate plate close to the left gate plate, and the side sealing block is provided in cooperation with the side sealing groove;

[0012] When the left gate plate and the right gate plate move to the first state, the side sealing block is partially or completely located in the side sealing groove;

[0013] When the left gate plate and the right gate plate move to the second state, a first distance exists between the side sealing block and the side sealing groove.

[0014] Furthermore, a side sealing gasket is provided in the side sealing groove.

[0015] Furthermore, the length direction of the side sealing groove is perpendicular to both the length direction of the shell and the length direction of the central channel.

[0016] Furthermore, the upper end surface of the left gate plate is provided with a left upper sealing groove, and the cross section of the right gate plate is provided with a right upper sealing groove;

[0017] The inner wall of the housing is provided with a left sealing block and a right sealing block;

[0018] When the left gate plate and the right gate plate move to the first state, the upper left sealing groove and the upper right sealing groove form a sealing ring groove, the left sealing block and the right sealing block form a sealing ring block, and the sealing ring block is partially or completely located in the sealing ring groove.

[0019] Furthermore, upper sealing gaskets are provided in both the upper left sealing groove and the upper right sealing groove.

[0020] Furthermore, the gate assembly also includes two gate seats symmetrically arranged relative to the central channel, the left end of the left gate and the right end of the right gate respectively abut against the two gate seats, and the driving device drives the two gate seats to perform relative or opposite synchronous movement.

[0021] Furthermore, the driving device includes two sets of push rod assemblies symmetrically arranged relative to the central channel, and a driving mechanism for driving the two sets of push rod assemblies to perform relative or opposite synchronous movements;

[0022] The push rod assembly includes a push rod component, and the push rod component includes a push rod and a push block. The push rod pushes the push block to move, and the push block abuts against the gate seat.

[0023] Furthermore, the push rod assembly further comprises a wedge-shaped push rod, the gate seat is provided with a guide mechanism for controlling the movement of the wedge-shaped push rod along the length direction of the housing, and the push rod pushes the wedge-shaped push rod;

[0024] The wedge-shaped push rod is provided with a wedge groove, the bottom of the wedge groove is inclined, and the height of the bottom of the groove on the side close to the central channel is lower than the height of the bottom of the groove on the side away from the central channel;

[0025] The left gate plate and the right gate plate are both provided with a support rod assembly, the other end of the support rod assembly is located in the wedge groove and can move along the length direction of the wedge groove.

[0026] Furthermore, the support rod assembly includes a support rod body, an axle pin and a pulley, wherein one end of the support rod body is connected to the left gate plate or the right gate plate, and the other end of the support rod body is connected to the pulley through the axle pin, and the pulley is located in the wedge groove.

[0027] Furthermore, the upper surface of the wedge-shaped push rod close to the central channel is a first inclined surface, and the bottoms of the left gate plate and the right gate plate both have a second inclined surface. When the left gate plate and the right gate plate move to the first state, the first inclined surface and the second inclined surface are in contact with each other.

[0028] Furthermore, the push rod assembly also includes a connecting disk, one end of which is connected to the wedge-shaped push rod, and the other end of which is connected to the push rod.

[0029] Furthermore, the push block has a hollow inner cavity, and a through hole for the push rod to pass through is provided at one end of the push block away from the central channel, the connecting disk is located in the inner cavity, and the cross-section of the connecting disk is larger than the through hole;

[0030] A retaining ring is provided on the push rod, and a spring is provided between the retaining ring and the push block.

[0031] Furthermore, there are multiple wedge-shaped push rods, and one end of each is evenly connected to the connecting plate.

[0032] Furthermore, the invention further comprises a side cover assembly, wherein the side cover assembly comprises two side cover components respectively encapsulated at both ends of the housing, the side cover component comprising a side cover body, and an outer boss and an inner boss respectively provided on two end surfaces of the side cover body, and the side cover body is provided with a push rod hole for the push rod to pass through;

[0033] Wherein, the inner boss is inserted into the end of the shell; the outer boss and the push rod are sealed and connected via a multi-stage sealer.

[0034] Furthermore, the multi-stage sealer includes a connecting body and a first external pressure cap, the connecting body includes a first connecting cylinder, the first connecting cylinder is sleeved on the push rod, and the external boss is sleeved on the end of the connecting body;

[0035] The first outer pressure cap includes a first annular ring and a first cylinder. The first annular ring is sleeved on the push rod. The first cylinder is formed by extending from the edge of the first annular ring toward the center channel. The first cylinder is sleeved on the outer wall of the outer boss.

[0036] Furthermore, a first sealing gasket is provided between the end surface of the connector close to the central channel and the side cover body;

[0037] A second sealing gasket is provided between the first annular ring and the outer boss.

[0038] Furthermore, the multi-stage sealer further comprises an inner pressure cap and a second outer pressure cap, wherein the inner pressure cap is sleeved on the push rod;

[0039] The connecting body further comprises a connecting ring and a second connecting tube, wherein the second connecting tube is connected to an end of the first connecting tube away from the central channel via the connecting ring, and the second connecting tube is partially sleeved on the outer wall of the inner pressure cap.

[0040] The second outer pressure cap includes a second annular ring and a second cylindrical body. The second annular ring is sleeved on the outer wall of the inner pressure cap. The second cylindrical body is extended from the edge of the second annular ring toward the center channel. The second cylindrical body is partially sleeved on the outer wall of the second connecting cylinder.

[0041] Furthermore, a third sealing gasket is provided between the inner pressure cap and the connecting ring, and a fourth sealing gasket is provided between the second connecting tube and the second annular ring.

[0042] Furthermore, the invention further comprises a locking mechanism, the locking mechanism comprising a locking assembly and a locking block, the locking assembly comprising a locking arm and a locking tongue, wherein one end of the locking arm is fixedly connected to the side cover body and the other end is connected to the locking tongue, and the locking block is fixed to the end of the push rod away from the central channel;

[0043] When the locking mechanism is in the first state, the side of the locking tongue close to the central channel is locked with the side of the locking block away from the central channel;

[0044] When the locking mechanism is in the second state, one end of the locking tongue close to the locking tongue push rod abuts against the surface of the locking block away from the push rod.

[0045] Furthermore, there are two locking mechanisms, which are symmetrically arranged relative to the central channel; and there are two locking components in each locking mechanism, which are symmetrically arranged relative to the push rod.

[0046] Furthermore, the locking block is a U-shaped structure, the two arms of the U-shaped structure are arranged in a direction away from the push rod, and,

[0047] When the locking mechanism is in the first state, the side of the locking tongue close to the central channel is locked with the free ends of the two arms of the U-shaped structure;

[0048] When the locking mechanism is in the second state, one end of the locking tongue close to the locking tongue push rod abuts against the two arms of the U-shaped structure.

[0049] Furthermore, the driving device also includes a connecting rod mechanism, which includes a connecting rod and two symmetrically arranged connecting rod assemblies, the head ends of the two connecting rod assemblies are respectively connected to the two ends of the connecting rod, and the tail ends are respectively connected to the two groups of push rod assemblies.

[0050] Furthermore, the connecting rod assembly includes a slideway trough body, a connecting rod arm and a positioning pin shaft, wherein the slideway trough body is fixed on the side cover body, and a slideway groove is provided on the slideway trough body;

[0051] One end of the positioning pin is arranged in the middle of the connecting rod arm, and the other end is located in the slideway groove;

[0052] One end of the link arm is hinged to the end of the push rod, and the other end is hinged to the end of the connecting rod.

[0053] Furthermore, a locking block is provided at the end of the push rod, and the locking block is a U-shaped structure. A hinge ring is provided on the two arms of the U-shaped structure, and a pin is placed in the opening of the U-shaped structure through the hinge ring. The connecting arm is connected to the pin.

[0054] Furthermore, the driving mechanism is a hydraulic cylinder, which includes a cylinder barrel, a cylinder seat and a piston rod. The free end of the piston rod is connected to the middle part of the connecting rod and is perpendicular to the connecting rod. The cylinder seat is installed on the outer wall of the shell, and the cylinder barrel is installed on the cylinder seat.

[0055] By adopting the above technical solution, the present invention has at least the following beneficial effects:

[0056] The present invention provides a high-temperature blowout preventer full-sealing device, which prevents steam (or well liquid) from interacting with the hydraulic oil by separating the driving mechanism such as the hydraulic cylinder from the blowout preventer body, and avoids the steam temperature from being transmitted to the hydraulic cylinder to cause the hydraulic oil to overheat. Through a single hydraulic cylinder and a variable fulcrum connecting rod structure, the left and right gates can move synchronously in the horizontal and vertical directions, thereby achieving reliable sealing of the side sealing end faces and the upper sealing end faces of the gates. Through the design of the connecting ring and the wedge-shaped push rod structure, the left and right gates can move upward synchronously horizontally, thereby achieving reliable sealing of the sealing end faces on the gates. By adopting a multi-stage internal and external sealing method, a reliable seal can be achieved between the push rod and the side cover body. Through the design of the lock tongue structure, the left and right gates can be automatically locked when closed. The gate adopts a packing sealing structure to achieve a 350C° high-temperature resistant seal. BRIEF DESCRIPTION OF THE DRAWINGS

[0057] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0058] Figure 1 This is a schematic diagram of the overall structure of a high-temperature blowout preventer full sealing device disclosed in one embodiment of the present invention;

[0059] Figure 2 for Figure 1 Stepped cross-sectional view (top view);

[0060] Figure 3 This is a structural diagram of the gate closed (side seal) state;

[0061] Figure 4 This is a structural diagram of the gate closed (upper end sealed) state;

[0062] Figure 5 This is a structural diagram of the connecting rod mechanism moving to the gate closed (upper end sealed) state;

[0063] Figure 6 Schematic diagram of the slideway groove shape;

[0064] Figure 7 It is a schematic diagram of the locking mechanism in the locked state;

[0065] Figure 8 It is a schematic diagram of the wedge groove and pulley structure. DETAILED DESCRIPTION

[0066] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the embodiments of the present invention are further described in detail below in conjunction with specific embodiments and with reference to the accompanying drawings.

[0067] It should be noted that all expressions using "first" and "second" in the embodiments of the present invention are for the purpose of distinguishing two non-identical entities with the same name or non-identical parameters. It can be seen that "first" and "second" are only for the convenience of expression and should not be understood as limitations on the embodiments of the present invention. Subsequent embodiments will not explain this one by one.

[0068] like Figures 1 to 8 As shown, some embodiments of the present invention disclose a high-temperature blowout preventer full sealing device, including a shell 801, a gate assembly 5, and a drive device, wherein a central channel perpendicular to the length direction of the shell 801 is provided in the middle of the shell 801.

[0069] The gate assembly 5 is disposed in the housing 801 and includes a left gate 502 and a right gate 504 disposed opposite to each other along the length direction of the housing 801. The left gate 502 and the right gate 504 are driven by the same driving device to perform relative or opposite synchronous motion.

[0070] When the left gate plate 502 and the right gate plate 504 move to a first state, the left gate plate 502 and the right gate plate 504 close the central passage; when the left gate plate 502 and the right gate plate 504 move to a second state, the central passage is opened.

[0071] In some embodiments of the present invention, the high-temperature blowout preventer full seal device disclosed herein, based on the above-described embodiments, comprises a side seal groove disposed on the left gate plate 502 near the right gate plate 504, and a side seal block disposed on the right gate plate 504 near the left gate plate 502, to enhance sealing reliability. When the left gate plate 502 and the right gate plate 504 are moved to a first position, the side seal block is partially or fully located within the side seal groove. When the left gate plate 502 and the right gate plate 504 are moved to a second position, a first distance is established between the side seal block and the side seal groove. Preferably, a side seal gasket 503 is disposed within the side seal groove. The longitudinal direction of the side seal groove is perpendicular to both the longitudinal directions of the housing 801 and the longitudinal direction of the central passage.

[0072] The high-temperature blowout preventer full seal device disclosed in some embodiments of the present invention, based on the above-mentioned embodiments, is further provided with an upper seal. Specifically, the upper end surface of the left gate plate 502 is provided with a left upper seal groove, and the upper end surface of the right gate plate 504 is provided with a right upper seal groove. The inner wall of the housing 801 is provided with a left sealing block and a right sealing block. When the left gate plate 502 and the right gate plate 504 move to the first state, the left upper seal groove and the right upper seal groove enclose a sealing ring groove, and the left sealing block and the right sealing block enclose a sealing ring block, and the sealing ring block is partially or completely located in the sealing ring groove. Preferably, an upper sealing gasket 501 is provided in both the left upper seal groove and the right upper seal groove.

[0073] In the high-temperature blowout preventer full seal device disclosed in some embodiments of the present invention, based on the above-mentioned embodiments, the gate assembly 5 further includes two gate seats 500 symmetrically arranged relative to the central channel, the left end of the left gate 502 and the right end of the right gate 504 respectively abutting against the two gate seats 500, and the drive device drives the two gate seats 500 to perform relative or opposite synchronous motion. The drive device includes two sets of push rod assemblies 4 symmetrically arranged relative to the central channel, and a drive mechanism that drives the two sets of push rod assemblies 4 to perform relative or opposite synchronous motion; the push rod assembly 4 includes a push rod assembly, which includes a push rod 401 and a push block 405. The push rod drives the push block 405 to move, and the push block 405 abuts the gate seat 500.

[0074] In some preferred embodiments, in order to achieve upper sealing, the push rod assembly also includes a wedge-shaped push rod 406, and the gate seat 500 is provided with a guide mechanism for controlling the movement of the wedge-shaped push rod 406 along the length direction of the shell 801, and the push rod 401 pushes the wedge-shaped push rod 406; the wedge push rod 406 is provided with a wedge groove 407, and the bottom of the wedge groove 407 is inclined, and the height of the bottom of the groove on the side close to the central channel is lower than the height of the bottom of the groove on the side away from the central channel; the left gate plate 502 and the right gate plate 504 are both provided with a support rod assembly, and the other end of the support rod assembly is located in the wedge groove 407 and can move along the length direction of the wedge groove 407. Preferably, the support rod assembly includes a support rod body 506, an axle pin 507 and a pulley 505, wherein one end of the support rod body 506 is connected to the left gate plate 502 or the right gate plate 504, and the other end of the support rod body 506 is connected to the pulley 505 through the axle pin 507, and the pulley 505 is located in the wedge groove 407.

[0075] In the above embodiment, in order to further ensure the stability of the upper sealing operation process, the upper surface of the wedge-shaped push rod 406 on the side close to the central channel is a first inclined surface, and the bottoms of the left gate plate 502 and the right gate plate 504 both have a second inclined surface. When the left gate plate 502 and the right gate plate 504 move to the first state, the first inclined surface and the second inclined surface are in contact with each other.

[0076] In some embodiments of the present invention, the high-temperature blowout preventer full seal device disclosed herein, based on the above-described embodiments, further comprises a connecting plate 403 connected at one end to the wedge-shaped push rod 406 and at the other end to the push rod 401. The push block 405 has a hollow interior cavity, and a through hole for the push rod to pass through is provided at the end of the push block 405 remote from the central passage. The connecting plate 403 is located within the interior cavity, and its cross-section is larger than the through hole. A retaining ring 400 is provided on the push rod 401, with a spring 402 interposed between the retaining ring 400 and the push block 405. Multiple wedge-shaped push rods 406 are provided, each uniformly connected at one end to the connecting plate 403.

[0077] The high-temperature blowout preventer full seal device disclosed in some embodiments of the present invention, based on the above embodiments, further includes a side cover assembly 3, which includes two side cover assemblies respectively encapsulated at both ends of the shell 801. The side cover assemblies include a side cover body 300, and an outer boss 301 and an inner boss 304 respectively provided on the two end surfaces of the side cover body 300. The side cover body 300 is provided with a push rod hole for allowing the push rod to pass through; wherein, the inner boss 304 is inserted into the end of the shell 801; the outer boss 301 and the push rod are sealed by a multi-stage sealer 2.

[0078] In some embodiments, the multi-stage sealer 2 includes a connector 203 and a first external pressure cap 205 . The connector 203 includes a first connector tube, which is sleeved on the push rod 401 . The external boss 301 is sleeved on the end of the connector 203 .

[0079] The first outer pressure cap 205 includes a first annular ring and a first cylinder. The first annular ring is mounted on the push rod 401. The first cylinder is extended from the edge of the first annular ring toward the center channel. The first cylinder is mounted on the outer wall of the outer boss 301.

[0080] Preferably, a first sealing gasket 207 is provided between the end surface of the connecting body 203 close to the central channel and the side cover body 300 ; and a second sealing gasket 206 is provided between the first annular ring and the outer boss 301 .

[0081] On the basis of the above embodiment, in order to further improve the sealing effect, the multi-stage sealer 2 further includes an inner pressure cap 202 and a second outer pressure cap 200, wherein the inner pressure cap 202 is mounted on the push rod 401; the connector 203 also includes a connecting ring and a second connecting tube, wherein the second connecting tube is connected to the end of the first connecting tube away from the central channel via the connecting ring, and the second connecting tube is partially mounted on the outer wall of the inner pressure cap 202; the second outer pressure cap 200 includes a second annular ring and a second cylinder, wherein the second annular ring is mounted on the outer wall of the inner pressure cap 202, and the second cylinder is formed by extending from the edge of the second annular ring toward the direction of the central channel, and the second cylinder is partially mounted on the outer wall of the second connecting tube. Preferably, a third sealing gasket 204 is provided between the inner pressure cap 202 and the connecting ring, and a fourth sealing gasket 201 is provided between the second connecting tube and the second annular ring.

[0082] The high-temperature blowout preventer full sealing device disclosed in some embodiments of the present invention, based on the above embodiments, further includes a locking mechanism 1, the locking mechanism 1 including a locking assembly and a locking block, the locking assembly including a locking arm 103 and a locking tongue 100, wherein one end of the locking arm 103 is fixedly connected to the side cover body 300 and the other end is connected to the locking tongue 100, and the locking block is fixed to the end of the push rod away from the central channel;

[0083] When the locking mechanism 1 is in the first state, the side of the locking tongue 100 close to the central channel is locked with the side of the locking block away from the central channel;

[0084] When the locking mechanism 1 is in the second state, the end of the locking tongue 100 close to the push rod of the locking tongue 100 abuts against the surface of the locking block away from the push rod.

[0085] In some embodiments, the locking mechanism 1 is provided in pairs and is symmetrically arranged relative to the central channel; and the locking components in each locking mechanism 1 are provided in pairs symmetrically relative to the push rod. The locking block is a U-shaped structure 600, with the two arms of the U-shaped structure 600 facing away from the push rod, and:

[0086] When the locking mechanism 1 is in the first state, the side of the locking tongue 100 close to the central channel is locked with the free ends of the two arms of the U-shaped structure 600;

[0087] When the locking mechanism 1 is in the second state, the end of the locking tongue 100 close to the push rod of the locking tongue 100 abuts against the two arms of the U-shaped structure 600 .

[0088] The high-temperature blowout preventer full seal device disclosed in some embodiments of the present invention, based on the above-mentioned embodiments, further comprises a connecting rod mechanism 6, comprising a connecting rod 610 and two symmetrically arranged connecting rod assemblies, the head ends of the two connecting rod assemblies being respectively connected to the two ends of the connecting rod 610, and the tail ends being respectively connected to the two sets of push rod assemblies 4. The connecting rod assembly comprises a slideway trough 606, a connecting rod arm 603, and a locating pin 604, wherein the slideway trough 606 is fixed to the side cover body 300 and is provided with a slideway groove 605; one end of the locating pin 604 is disposed in the middle of the connecting rod arm 603, and the other end is located in the slideway groove 605; one end of the connecting arm 603 is hinged to the end of the push rod, and the other end is hinged to the end of the connecting rod 610. A locking block is provided at the end of the push rod, and the locking block is a U-shaped structure 600. A hinge ring 602 is provided on the two arms of the U-shaped structure 600. The pin shaft 601 is placed in the opening of the U-shaped structure 600 through the hinge ring 602, and the connecting arm is connected to the pin shaft 601.

[0089] In the high-temperature blowout preventer full seal device disclosed in some embodiments of the present invention, based on the above embodiments, the driving mechanism is a hydraulic cylinder 7, which includes a cylinder barrel 701, a cylinder base 702, and a piston rod 700. The free end of the piston rod 700 is connected to the middle part of the connecting rod 610 and is perpendicular to the connecting rod 610. The cylinder base 702 is mounted on the outer wall of the housing 801, and the cylinder barrel 701 is mounted on the cylinder base 702.

[0090] Example 1:

[0091] A high-temperature blowout preventer full sealing device, comprising: a locking mechanism 1 for locking the gate, a multi-stage sealer 2, a side cover assembly 3, a push rod assembly 4, a gate assembly 5, a connecting rod mechanism 6, a hydraulic cylinder 7, and a blowout preventer housing 8. Figure 1 and Figure 2 shown.

[0092] The gate locking mechanism 1 includes: a lock tongue 100, a lock cap 101, a lock spring 102, a locking arm 103, a locking surface 104, as shown in FIG. Figure 1 shown.

[0093] The multi-stage sealer 2 includes: a second outer pressure cap 200, a fourth sealing gasket 201, an inner pressure cap 202, a connector 203, a third sealing gasket 204, a first outer pressure cap 205, a second sealing gasket 206, a first sealing gasket 207, as shown in FIG. Figure 1 shown.

[0094] The side cover assembly 3 includes: a side cover body 300, an outer boss 301, bolts 302, a side seal 303, an inner boss 304, as shown in FIG. Figure 1 shown.

[0095] The push rod assembly 4 includes: a retaining ring 400, a push rod 401, a spring 402, a connecting plate 403, a connecting boss 404, a push block 405, a wedge-shaped push rod 406, and a wedge groove 407. Figure 1 shown.

[0096] The gate assembly 5 includes: a gate seat 500, an upper sealing gasket 501, a left gate 502, a side sealing gasket 503, a right gate 504, a pulley 505, a support rod body 506, and a shaft pin 507. Figure 1 and Figure 8 shown.

[0097] The connecting rod mechanism 6 includes: a U-shaped structure 600, a pin 601, a hinge ring 602, a connecting rod arm 603, a positioning pin 604, a slide groove 605, a slide groove body 606, a hinge ring 607, a pin 608, a U-shaped block 609, a connecting rod 610, and a locking surface 611. Figure 1 and Figure 2 shown.

[0098] The hydraulic cylinder 7 includes a piston rod 700, a cylinder barrel 701, and a cylinder base 702. Figure 2 shown.

[0099] The BOP housing 8 comprises: a housing 801, a sealing boss 800, i.e. a left sealing block and a right sealing block, as shown in FIG. Figure 1 shown.

[0100] Example 2:

[0101] The gate locking mechanism 1, the multi-stage sealer 2, the side cover assembly 3, the push rod assembly 4, the gate assembly 5, and the connecting rod mechanism 6 are symmetrically arranged on the left and right sides of the blowout preventer housing 8; the hydraulic cylinder 7 is arranged on the front side of the blowout preventer housing 8, as shown in FIG. Figure 1 and Figure 2 shown.

[0102] Example 3:

[0103] The upper part of the housing 801 is provided with a sealing boss 800 for sealing the upper part of the gate assembly 5. Figure 1 and Figure 4 shown.

[0104] The push rod assembly 4 and the gate assembly 5 are symmetrically arranged inside the shell 801; the side cover assembly 3 is symmetrically arranged on the outside of the shell 801, and the gate locking mechanism 1 and the multi-stage sealer 2 are arranged on the other side of the side cover assembly 3. Figure 1As shown. A hydraulic cylinder 7 is provided at the front of the outer side of the housing 801. Figure 2 shown.

[0105] Example 4:

[0106] A connecting rod mechanism 6 is provided between the end of the push rod 401 and the end of the piston rod 700, and its function is to transmit the thrust generated by the piston rod 700 to the push rod 401. Figure 2 shown.

[0107] Example 5:

[0108] The gate seat 500 is symmetrically arranged on the left and right sides of the housing 801, and the left gate 502 and the right gate 504 are respectively provided thereon; the left gate 502 is provided with a semicircular groove and a straight groove, and the upper sealing gasket 501 and the side sealing gasket 503 are respectively provided in the groove; the right gate 504 is provided with a straight boss and a semicircular groove, and the straight boss corresponds to the straight groove structure on the left gate 502, and the semicircular groove corresponds to the semicircular groove on the left gate 502, forming a complete circle and consistent with the size of the sealing boss 800. The semicircular groove on the right gate 504 is provided with a sealing gasket identical to the upper sealing gasket 501; the lower parts of the left gate 502 and the right gate 504 are respectively provided with the same support rod body 506; the other end of the support rod body 506 is provided with a shaft pin 507, and pulleys 505 are provided at both ends of the shaft pin 507. Figure 1 and Figure 8 shown.

[0109] Furthermore, the left gate plate 502, the side sealing gasket 503 and the right gate plate 504 together realize the sealing of the side surface, which can also be understood as the front surface, when the left and right gate plates are closed. Figure 3 shown.

[0110] Furthermore, the left gate plate 502, the upper sealing gasket 501, the right gate plate 504 and the sealing boss 800 jointly seal the upper surfaces of the left and right gate plates, thereby achieving full sealing of the wellhead. Figure 4 shown.

[0111] Example 6:

[0112] The wedge-shaped push rod 406 is provided with a wedge groove 407, the axial shape of which is as follows: Figure 1 As shown, the cross-sectional shape is Figure 8 As shown, a pulley 505 is provided therein, and the pulley 505 can slide in its wedge groove 407, as shown in FIG. Figure 8 As shown; wedge-shaped push rod 406 is provided in the gate seat 500, which is evenly arranged in the horizontal direction 3, and can slide synchronously, see Figure 2; A connecting disk 403 is provided at one end of the wedge-shaped push rod 406, one end of the connecting disk 403 is groove-shaped and connected to the connecting boss 404 at one end of the push rod 401; the push block 405, the spring 402, and the retaining ring 400 are sequentially mounted on the push rod 401, and the retaining ring 400 is fixedly connected to the push rod 401.

[0113] Furthermore, the retaining ring 400 is fixedly connected to the push rod 401; the push block 405 is sleeved on the push rod 401 and can slide on the push rod 401, and the springs 402 and the connecting disk 403 are provided on the left and right sides of the push block 405 in sequence; the connecting disk 403 is fixedly connected to the wedge-shaped push rod 406, and the connecting disk 403 can slide in the push block 405.

[0114] 406 also move right synchronously, further, that is, the push rod assembly 401 moves right as a whole, so that the left and right gates are closed and the end faces are sealed, as shown in FIG. Figure 3 shown.

[0115] Example 7:

[0116] When the left and right gates are closed, the push rod 401 continues to move to the right. The thrust of the push rod 401 overcomes the force of the spring 402 on the left gate 502, compressing the spring 402. The connecting boss 404 of the push rod 401 pushes the connecting disk 403 to make the wedge-shaped push rod 406 continue to move to the right, causing the pulley 505 in the wedge groove 407 to move upward, thereby pushing the left gate 502 upward, achieving sealing on the sealing surface of the left gate 502. Figure 4 shown.

[0117] Furthermore, the left gate plate 502 and the right gate plate 504 move synchronously in both the horizontal and vertical directions.

[0118] Furthermore, three wedge-shaped push rods 406 are set in the horizontal direction and fixedly connected to the connecting plate 403. This structure ensures that the three wedge-shaped push rods 406 move synchronously, thereby maintaining the horizontality during the upward movement of the left gate plate 502 and the right gate plate 504, thereby increasing the sealing effect of the upper sealing surface.

[0119] For further description of the synchronous movement of the left gate plate 502 and the right gate plate 504 in the horizontal direction, please refer to Example 11.

[0120] Example 8:

[0121] An outer boss 301 and an inner boss 304 are respectively provided on both sides of the side cover body 300. The side cover body 300 is sleeved on the push rod 401, and the push rod 401 can move left and right. A side sealing gasket 303 and a bolt 302 are provided between the side cover body 300 and the shell 801.

[0122] Furthermore, the outer boss 301 is used to connect the multi-stage sealer 2 , and the inner boss 304 is used to position and increase the strength of the side cover body 300 .

[0123] Example 9:

[0124] The radial inner and outer sides of the outer boss 301 are provided with a connector 203 and a first outer pressure cap 205 in sequence, and are respectively connected to the inner and outer threads of the outer boss 301; the radial inner and outer sides of the other end of the connector 203 are provided with an inner pressure cap 202 and a second outer pressure cap 200 in sequence, and are respectively connected to the inner and outer threads of the connector 203; the end face of the connector 203 is provided with a fourth sealing gasket 201, a third sealing gasket 204, and a first sealing gasket 207 in sequence, and the end face of the outer boss 301 is provided with a second sealing gasket 206.

[0125] Furthermore, the function of the multi-stage sealer 2 is to seal the push rod 401; the function of the second sealing gasket 206 is a remedial measure to prevent external sealing leakage of the first sealing gasket 207; the function of the third sealing gasket 204 is a remedial measure to prevent internal sealing leakage of the first sealing gasket 207; the function of the fourth sealing gasket 201 is a remedial measure to prevent external sealing leakage of the third sealing gasket 204.

[0126] Furthermore, under normal circumstances, the first sealing gasket 207 plays a main sealing role, and the other three sealing gaskets are in a standby state, thereby ensuring the reliability of the sealing.

[0127] Example 10:

[0128] Locking arms 103 are symmetrically provided on the upper and lower sides of the outer side of the push rod 401, and their ends are fixedly connected to the side cover body 300; a lock tongue 100 is provided on the other side of the lock arm 103, which can slide up and down on it. A locking surface 104 is provided on one side of the lower part of the lock tongue 100, and a hole seat for placing a lock spring 102 is provided on the upper part. The locking surface 104 faces inward, and the lower end surface of the lock tongue 100 contacts the upper end surface of the U-shaped structure 600; a lock cap 101 and a lock spring 102 are provided on the upper part of the lock tongue 100 in sequence. Figure 1 shown.

[0129] Furthermore, only Figure 1 Take the numbered portion as an example: the lock spring 102 generates a downward thrust for the lock tongue 100. When the U-shaped structure 600 moves to the right and the gate is closed, the lock tongue 100 moves downward under the thrust of the lock spring 102, causing the locking surface 104 to contact the locking surface 611. At this time, even if the locking surface 611 has a reverse thrust on the locking surface 104, the thrust of the lock spring 102 overcomes this thrust and the lock tongue 100 cannot move upward, thereby achieving the purpose of automatically locking the U-shaped structure 600, thereby locking the push rod 401, and thus achieving the purpose of locking the gate. Figure 7 shown.

[0130] Furthermore, there are four gate locking mechanisms 1, which are symmetrically arranged on the left and right sides of the high-temperature blowout preventer full sealing device, such as Figure 1 shown.

[0131] Example 11:

[0132] The upper and lower left end surfaces of the U-shaped structure 600 are provided with locking surfaces 611, such as Figure 1 As shown, the slope of its conical surface is consistent with the slope of the conical surface of the locking surface 104. The U-shaped structure 600 is fixedly connected to the left end of the push rod 401; the hinge ring 602 is connected to the U-shaped structure 600 through the pin 601 and can rotate; the slide groove 605 is provided on the slide groove body 606, and its width is consistent with the diameter of the positioning pin 604. The shape of the slide groove 605 is a part of an ellipse with 2L2 as the major axis and 2L1 as the minor axis, as shown in FIG. Figure 6 As shown, the slide groove body 606 is fixedly connected to the side cover body 300; the hinge ring 602 and the hinge ring 607 are fixedly connected by the connecting arm 603, and the connecting arm 603 is provided with a positioning pin 604, which is set in the slide groove 605 and can slide; the center position of the connecting rod 610 is fixedly connected to the piston rod 700, and U-shaped blocks 609 are provided at both ends. The hinge ring 607 and the U-shaped block 609 are connected by a pin 608 and can rotate, as shown in FIG. Figure 2 shown.

[0133] Furthermore, the motion trajectory of the positioning pin 604 is a part of an ellipse with 2L2 as the major axis and 2L1 as the minor axis, as shown in FIG. Figure 6 As shown, the positioning pin shaft 604 slides in the slide groove 605 and serves as a movable fulcrum on the connecting rod arm 603. L2 is greater than L1, which can increase the thrust of the push rod 401 under the same thrust condition of the piston rod 700.

[0134] Furthermore, the connecting rod mechanism 6 is symmetrically arranged on the left and right sides of the high-temperature blowout preventer full seal device. When the piston rod 700 is extended, it pushes the connecting rod 610 forward, thereby ensuring that the left and right push rods also move synchronously, thereby ensuring the synchronous movement, that is, the displacement, of the left and right gate plates. Furthermore, the left gate plate 502 and the right gate plate 504 move synchronously in the horizontal direction by the same displacement, ensuring the side sealing and upper sealing effects of the left and right gate plates.

[0135] Furthermore, the operation of the corresponding connecting rod mechanism 6 when the left and right gates are in the open and closed positions is as follows: Figure 2 and Figure 5 shown.

[0136] Example 12:

[0137] The cylinder 701 is connected to the housing 801 through the cylinder base 702. Figure 2 Another function of the cylinder base 702 is heat insulation, which prevents the shell 801 from transferring heat to the cylinder barrel 701 and protects the cylinder barrel 701 from overheating.

[0138] Example 13:

[0139] The sealing gasket described in this patent can be a high-temperature resistant graphite sealing gasket.

[0140] Example 14:

[0141] Working principle: Under normal circumstances, the gate is in the open state, the piston rod is in the retracted state, the first sealing gasket 207 of the multi-stage sealer is in the sealed state compressed by the connecting body 203, the lock tongue 100 of the gate locking mechanism 1 is in the retracted state, and the push rod assembly 4 is in the extended state. Figure 1 and Figure 2 shown.

[0142] When the gate needs to be closed, the hydraulic cylinder is started, the piston rod 700 extends, and the connecting rod 610 moves. The connecting rod mechanism 6 on both sides also moves accordingly, so that the push rods 401 on both sides move inward, and then the gate assembly 5 moves inward as a whole, achieving the purpose of sealing the gate side. Figure 3 As shown; the piston rod 700 continues to extend, and continues to push the push rod 401 inward through the connecting rod mechanism 6. At this time, the spring 402 begins to be further compressed, and the gate assembly 5 no longer moves inward, but the push rod 401 pushes the wedge-shaped push rod 406 inward, forcing the pulley 505 in the wedge groove 407 to move upward along the wedge groove 407, thereby pushing the left and right gates to move upward synchronously, realizing the sealing surface sealing on the left and right gates, as shown Figure 4 As shown; the movement position of the connecting rod mechanism 6 at this time is as shown Figure 5 As shown, the gate locking mechanism 1 is in a locking state for the left and right gates, as shown in FIG. Figure 7 shown.

[0143] It should be pointed out in particular that the various components or steps in the above-mentioned embodiments can be cross-linked, replaced, added, or deleted with each other. Therefore, the combinations formed by these reasonable permutations and combinations should also fall within the scope of protection of the present invention, and the scope of protection of the present invention should not be limited to the embodiments.

[0144] The above are exemplary embodiments disclosed in the present invention. The order in which the above embodiments of the present invention are disclosed is for description only and does not represent the advantages and disadvantages of the embodiments. However, it should be noted that the discussion of any of the above embodiments is only exemplary and is not intended to imply that the scope disclosed in the embodiments of the present invention (including the claims) is limited to these examples. Various changes and modifications may be made without departing from the scope defined in the claims. The functions, steps and / or actions of the method claims according to the disclosed embodiments described herein do not need to be performed in any particular order. In addition, although the elements disclosed in the embodiments of the present invention may be described or required in individual form, they may also be understood as multiple unless expressly limited to the singular.

[0145] Those skilled in the art should understand that the discussion of any of the above embodiments is merely illustrative and is not intended to imply that the scope of the disclosure of the embodiments of the present invention (including the claims) is limited to these examples. Within the spirit of the embodiments of the present invention, the technical features of the above embodiments or different embodiments may be combined, and there are many other variations of the different aspects of the embodiments of the present invention described above, which are not provided in detail for the sake of clarity. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the embodiments of the present invention should be included within the scope of protection of the embodiments of the present invention.

Claims

1. A high-temperature blowout preventer full sealing device, characterized in that: Including housing, gate assembly, drive device, The middle of the shell is provided with a central channel perpendicular to the length direction of the shell. The gate assembly is arranged in the housing, and includes a left gate and a right gate that are arranged opposite to each other along the length direction of the housing. The left gate and the right gate perform relative or opposite synchronous motion under the drive of the same driving device; When the left gate plate and the right gate plate move to the first state, the left gate plate and the right gate plate close the central channel; When the left gate plate and the right gate plate move to the second state, the central channel is opened; A side sealing groove is provided on the side of the left gate plate close to the right gate plate, and a side sealing block is provided on the side of the right gate plate close to the left gate plate, and the side sealing block is provided in cooperation with the side sealing groove; When the left gate plate and the right gate plate move to the first state, the side sealing block is partially or completely located in the side sealing groove; When the left gate plate and the right gate plate move to the second state, a first distance exists between the side sealing block and the side sealing groove; The gate assembly further includes two gate seats symmetrically arranged relative to the central channel, the left end of the left gate and the right end of the right gate respectively abut against the two gate seats, and the driving device drives the two gate seats to perform relative or opposite synchronous movements; The driving device includes two sets of push rod assemblies symmetrically arranged relative to the central channel, and a driving mechanism for driving the two sets of push rod assemblies to perform relative or opposite synchronous movements; The push rod assembly includes a push rod assembly, and the push rod assembly includes a push rod and a push block, wherein the push rod pushes the push block to move, and the push block abuts against the gate seat; The push rod assembly further includes a wedge-shaped push rod, and the gate seat is provided with a guide mechanism for controlling the movement of the wedge-shaped push rod along the length direction of the housing, and the push rod pushes the wedge-shaped push rod; The wedge-shaped push rod is provided with a wedge groove, the bottom of the wedge groove is inclined, and the height of the bottom of the groove on the side close to the central channel is lower than the height of the bottom of the groove on the side away from the central channel; The left gate plate and the right gate plate are both provided with a support rod assembly, the other end of the support rod assembly is located in the wedge groove and can move along the length direction of the wedge groove; The support rod assembly includes a support rod body, an axle pin and a pulley, wherein one end of the support rod body is connected to the left gate plate or the right gate plate, and the other end of the support rod body is connected to the pulley through the axle pin, and the pulley is located in the wedge groove.

2. The high-temperature blowout preventer full sealing device according to claim 1, characterized in that: A side sealing gasket is arranged in the side sealing groove.

3. The high-temperature blowout preventer full sealing device according to claim 1, characterized in that: The length direction of the side sealing groove is perpendicular to the length direction of the shell and the length direction of the central channel.

4. The high-temperature blowout preventer full sealing device according to claim 1, characterized in that: The upper surface of the left gate plate is provided with a left upper sealing groove, and the cross section of the right gate plate is provided with a right upper sealing groove; The inner wall of the housing is provided with a left sealing block and a right sealing block; When the left gate plate and the right gate plate move to the first state, the upper left sealing groove and the upper right sealing groove form a sealing ring groove, the left sealing block and the right sealing block form a sealing ring block, and the sealing ring block is partially or completely located in the sealing ring groove.

5. The high-temperature blowout preventer full sealing device according to claim 4, characterized in that: Upper sealing gaskets are provided in both the upper left sealing groove and the upper right sealing groove.

6. The high-temperature blowout preventer full sealing device according to claim 1, characterized in that: The upper surface of the wedge-shaped push rod close to the central channel is a first inclined surface, and the bottoms of the left gate plate and the right gate plate both have a second inclined surface. When the left gate plate and the right gate plate move to the first state, the first inclined surface and the second inclined surface are in contact with each other.

7. The high-temperature blowout preventer full sealing device according to claim 1, characterized in that: The push rod assembly further comprises a connecting disc, one end of which is connected to the wedge-shaped push rod, and the other end of which is connected to the push rod.

8. The high-temperature blowout preventer full sealing device according to claim 7, characterized in that: The push block has a hollow inner cavity, and a through hole for the push rod to pass through is provided at one end of the push block away from the central channel, the connecting disk is located in the inner cavity, and the cross-section of the connecting disk is larger than the through hole; A retaining ring is provided on the push rod, and a spring is provided between the retaining ring and the push block.

9. The high-temperature blowout preventer full sealing device according to claim 7, characterized in that: There are multiple wedge-shaped push rods, and one end of each push rod is evenly connected to the connecting plate.

10. The high-temperature blowout preventer full sealing device according to claim 1, characterized in that: Also included is a side cover assembly, the side cover assembly comprising two side cover components respectively encapsulated at both ends of the housing, the side cover component comprising a side cover body, and an outer boss and an inner boss respectively provided on two end surfaces of the side cover body, the side cover body being provided with a push rod hole for a push rod to pass through; Wherein, the inner boss is inserted into the end of the shell; the outer boss and the push rod are sealed and connected via a multi-stage sealer.

11. The high-temperature blowout preventer full sealing device according to claim 10, characterized in that: The multi-stage sealer includes a connecting body and a first external pressure cap, wherein the connecting body includes a first connecting cylinder, the first connecting cylinder is sleeved on the push rod, and the external boss is sleeved on the end of the connecting body; The first outer pressure cap includes a first annular ring and a first cylinder. The first annular ring is sleeved on the push rod. The first cylinder is formed by extending from the edge of the first annular ring toward the center channel. The first cylinder is sleeved on the outer wall of the outer boss.

12. The high-temperature blowout preventer full sealing device according to claim 11, characterized in that: A first sealing gasket is provided between the end surface of the connector close to the central channel and the side cover body; A second sealing gasket is provided between the first annular ring and the outer boss.

13. The high-temperature blowout preventer full sealing device according to claim 11, characterized in that: The multi-stage sealer further comprises an inner pressure cap and a second outer pressure cap, wherein the inner pressure cap is sleeved on the push rod; The connecting body further comprises a connecting ring and a second connecting tube, wherein the second connecting tube is connected to an end of the first connecting tube away from the central channel via the connecting ring, and the second connecting tube is partially sleeved on the outer wall of the inner pressure cap. The second outer pressure cap includes a second annular ring and a second cylindrical body. The second annular ring is sleeved on the outer wall of the inner pressure cap. The second cylindrical body is extended from the edge of the second annular ring toward the center channel. The second cylindrical body is partially sleeved on the outer wall of the second connecting cylinder.

14. The high-temperature blowout preventer full sealing device according to claim 13, characterized in that: A third sealing gasket is provided between the inner pressure cap and the connecting ring, and a fourth sealing gasket is provided between the second connecting tube and the second annular ring.

15. The high-temperature blowout preventer full sealing device according to claim 10, characterized in that: The locking mechanism further comprises a locking assembly and a locking block, wherein the locking assembly comprises a locking arm and a locking tongue, wherein one end of the locking arm is fixedly connected to the side cover body and the other end is connected to the locking tongue, and the locking block is fixed to an end of the push rod away from the central channel; When the locking mechanism is in the first state, the side of the locking tongue close to the central channel is locked with the side of the locking block away from the central channel; When the locking mechanism is in the second state, one end of the locking tongue close to the locking tongue push rod abuts against the surface of the locking block away from the push rod.

16. The high-temperature blowout preventer full sealing device according to claim 15, characterized in that: There are two locking mechanisms, which are symmetrically arranged relative to the central channel; and there are two locking components in each locking mechanism, which are symmetrically arranged relative to the push rod.

17. The high-temperature blowout preventer full sealing device according to claim 16, characterized in that: The locking block is a U-shaped structure, with two arms of the U-shaped structure facing away from the push rod, and When the locking mechanism is in the first state, the side of the locking tongue close to the central channel is locked with the free ends of the two arms of the U-shaped structure; When the locking mechanism is in the second state, one end of the locking tongue close to the locking tongue push rod abuts against the two arms of the U-shaped structure.

18. The high-temperature blowout preventer full sealing device according to claim 10, characterized in that: The driving device also includes a connecting rod mechanism, which includes a connecting rod and two symmetrically arranged connecting rod assemblies. The head ends of the two connecting rod assemblies are respectively connected to the two ends of the connecting rod, and the tail ends are respectively connected to the two sets of push rod assemblies.

19. The high-temperature blowout preventer full sealing device according to claim 18, characterized in that: The connecting rod assembly includes a slideway trough body, a connecting rod arm and a positioning pin shaft, wherein the slideway trough body is fixed to the side cover body, and a slideway groove is provided on the slideway trough body; One end of the positioning pin is arranged in the middle of the connecting rod arm, and the other end is located in the slideway groove; One end of the link arm is hinged to the end of the push rod, and the other end is hinged to the end of the connecting rod.

20. The high-temperature blowout preventer full sealing device according to claim 19, characterized in that: A locking block is provided at the end of the push rod. The locking block is a U-shaped structure. A hinge ring is provided on the two arms of the U-shaped structure. The pin is placed in the opening of the U-shaped structure through the hinge ring. The connecting arm is connected to the pin.

21. The high-temperature blowout preventer full sealing device according to claim 18, characterized in that: The driving mechanism is a hydraulic cylinder, which includes a cylinder barrel, a cylinder seat and a piston rod. The free end of the piston rod is connected to the middle part of the connecting rod and is perpendicular to the connecting rod. The cylinder seat is installed on the outer wall of the shell, and the cylinder barrel is installed on the cylinder seat.

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