Petroleum wellhead blowout preventer

Abstract

The utility model relates to the technical field of wellhead blowout prevention devices, and discloses a petroleum wellhead blowout prevention device which comprises a packing box body, an adjusting mechanism is arranged in the packing box body, a pressure relief assembly is arranged at the top of the packing box body, and the adjusting mechanism comprises a sealing assembly and a mistaken touch prevention assembly. The mistaken touch prevention assembly is arranged on the left side of the sealing assembly. Due to the fact that a worm and a worm gear are provided with locking structures, a push plate is prevented from moving downwards due to the gravity effect, a clamping block is used for clamping a clamping ring, the hand wheel is limited, the situation that the worm rotates due to the fact that a worker touches the hand wheel by mistake is avoided, secondary limiting is conducted on the device, and the sealing effect of the device is enhanced; the hand wheel is rotated to enable the sealing ring not to make contact with the sealing block, the cover plate is jacked up through internal pressure, after the pressure is released, the cover plate continues to close the pressure relief opening through the arrangement of the tension spring, the sealing piece is attached to the pressure relief opening, and air leakage is prevented at ordinary times.

Description

Technical Field

[0001] The utility model relates to the technical field of wellhead blowout prevention devices, in particular to a petroleum wellhead blowout prevention device. Background Art

[0002] The polished rod of a pumping well is a key part of the pumping equipment. It has two functions: one is to bear the downhole load through the rope hanger and the square clip; the other is to seal the wellhead with the wellhead packing box. The packing box is a sealing device between the wellhead and the polished rod of the pumping well, which plays the role of sealing the annular space between the oil pipe and the polished rod during the normal production process of the oil well.

[0003] According to the description of a petroleum wellhead blowout preventer disclosed on the patent website (authorization announcement number: CN 216841548U), "The utility model discloses a petroleum wellhead blowout preventer, including a body casing, a fixed sleeve is fixedly connected to the left part of the front end face of the body casing, an adjustment device is arranged in the inner cavity of the fixed sleeve, threaded holes are evenly arranged on the upper end face of the body casing, a sealing groove is arranged in the middle part of the upper end face of the body casing, a sealing cover is fixedly connected to the body casing through the threaded holes and bolts, a sealing pad is arranged inside the lower end face of the sealing cover, a pressure relief device is arranged at the rear part of the upper end face of the sealing cover, a polished rod is slidably connected inside the sealing cover, a limiting groove is arranged in the middle part of the inner cavity of the body casing, and a sealing block is fixed at the upper edge of the inner cavity wall of the body casing. The utility model relates to the technical field of petroleum wellhead blowout preventers. The petroleum wellhead blowout preventer solves the problem that it is inconvenient to discharge the pressure when the internal pressure of the existing petroleum wellhead blowout preventer is too large, and it is inconvenient to adjust the fit between the conical sealing block and the wellhead according to the wellhead."

[0004] In view of the above description, the applicant believes that there are the following problems:

[0005] During use, the utility model controls the threaded barrel through the worm gear, which then pushes the disc, causing the first spring to bounce the support plate and the conical sealing block, and then the conical sealing blocks to fit together. However, in actual use, although the worm gear has a self-locking function, the operator's accidental touch of the crank handle will still cause the worm to rotate, thereby driving the worm wheel to rotate, causing the conical sealing block to move, so that the conical sealing block cannot fit together with the sealing block. Therefore, it is necessary to improve an oil wellhead blowout prevention device to solve the above problem. Utility Model Content

[0006] The utility model aims to provide a petroleum wellhead blowout prevention device to solve the problems raised in the above background technology.

[0007] To achieve the above object, the utility model provides the following technical solutions: a petroleum wellhead blowout prevention device, comprising a packing box body, an adjusting mechanism is arranged inside the packing box body, and a pressure relief assembly is arranged on the top of the packing box body;

[0008] The adjustment mechanism comprises a sealing component and an anti-accidental touch component, and the anti-accidental touch component is arranged on the left side of the sealing component.

[0009] Preferably, the sealing assembly includes a fixed plate, which is fixedly installed inside the packing box body, a worm gear is rotatably installed on the bottom of the fixed plate, a threaded tube is threadedly installed inside the worm gear, a worm is rotatably installed inside the packing box body, a handwheel is fixedly installed on the left side of the worm, a push plate is fixedly installed on the top of the threaded tube, a spring 1 is fixedly installed on the top of the push plate, a sealing ring is fixedly installed on the end of the spring 1 away from the push plate, and a sealing block is fixedly installed inside the packing box body, and the elastic force of the spring 1 is used to make the sealing ring and the sealing block fit tightly, so that the sealing between the sealing ring and the sealing block is enhanced.

[0010] Preferably, the worm is meshed with the worm wheel, through holes are provided at corresponding positions of the fixed plate and the threaded tube, and the threaded tube passes through the through hole and is fixedly installed with a push plate, and the push plate is slidably installed inside the packing box body so that the sealing ring can move upward.

[0011] Preferably, the anti-accidental-touch assembly includes a fixed box, which is fixedly installed on the left side of the packing box body, a clamping ring is rotatably installed on the left side of the fixed box, a fixing buckle is fixedly installed on the bottom of the fixed box, a clamping block is rotatably installed on the inner side of the fixing buckle, and a spring 2 is fixedly installed on the top of the clamping block to prevent the worm from rotating due to accidental touch of the handwheel by the staff, and the device is limited for the second time, thereby enhancing the sealing effect of the device.

[0012] Preferably, through holes are provided at positions corresponding to the fixed box and the handwheel, and the handwheel passes through the fixed box and is fixedly installed with the worm, one end of the second spring away from the clamping block is fixedly installed with the fixed box, clamping grooves are provided at positions corresponding to the clamping ring and the clamping block, and the clamping grooves are distributed circumferentially at the center position of the clamping ring, and the clamping ring is fixedly installed on the outside of the handwheel to clamp the clamping ring to prevent the handwheel from rotating due to accidental touch.

[0013] Preferably, the pressure relief assembly includes a cover cap, which is threadably mounted on the top of the packing box body by bolts, a mounting frame is fixedly mounted inside the cover cap, a rotating shaft is fixedly mounted inside the mounting frame, a cover plate is rotatably mounted outside the rotating shaft, a tension spring is fixedly mounted on the inner side of the cover plate, and a sealing sheet is fixedly mounted on the bottom of the cover plate. When the internal pressure is high, the hand wheel is turned to prevent the sealing ring from contacting the sealing block, and the internal pressure lifts the cover plate. After the pressure is released, the cover plate continues to close the pressure relief port through the setting of the tension spring, and the sealing sheet fits with the pressure relief port to prevent air leakage at normal times.

[0014] Preferably, a pressure relief port is provided inside the cap, and the diameter of the sealing sheet is larger than the diameter of the pressure relief port, and the end of the tension spring away from the cover is fixedly mounted to the mounting frame, and the tension spring is arranged outside the rotating shaft, so that the cover can automatically realize the closing function.

[0015] Compared with the prior art, the utility model provides a petroleum wellhead blowout prevention device having the following

[0016] Beneficial effects:

[0017] 1. The oil wellhead blowout prevention device, through the provided adjustment mechanism, limits the hand wheel during use, because the worm and the worm wheel themselves have a locking structure to prevent the push plate from moving downward due to gravity, and the clamping block is used to clamp the clamping ring to limit the hand wheel, preventing the hand wheel from rotating due to the worm being accidentally touched by the staff, and performing a secondary limit on the device to enhance the sealing effect of the device.

[0018] 2. The oil wellhead blowout prevention device has a pressure relief component. During use, when the internal pressure is high, the hand wheel is turned to prevent the sealing ring from contacting the sealing block. The internal pressure lifts the cover plate. After the pressure is released, the cover plate continues to close the pressure relief port through the setting of the tension spring, and the sealing sheet fits with the pressure relief port to prevent air leakage at ordinary times. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative labor:

[0020] Figure 1 This is a schematic diagram of the appearance structure of the utility model;

[0021] Figure 2 This is a schematic diagram of the internal structure of the utility model;

[0022] Figure 3This is a schematic diagram of the cross-sectional structure of the sealing component of the utility model;

[0023] Figure 4 This is a schematic diagram of the exploded structure of the anti-mistouch component of the utility model;

[0024] Figure 5 This is a schematic diagram of the exploded structure of the pressure relief component of the utility model.

[0025] In the figure: 1. packing box body; 2. adjustment mechanism; 21. sealing assembly; 211. fixing plate; 212. worm gear; 213. threaded pipe; 214. worm; 215. hand wheel; 216. push plate; 217. spring one; 218. sealing ring; 219. sealing block; 22. anti-accidental touch assembly; 221. fixing box; 222. snap ring; 223. fixing buckle; 224. snap block; 225. spring two; 3. pressure relief assembly; 31. cover cap; 32. mounting bracket; 33. rotating shaft; 34. tension spring; 35. cover plate; 36. sealing sheet. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0027] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0028] Embodiment 1:

[0029] See also Figure 1-4 The utility model provides a technical solution: a petroleum wellhead blowout prevention device, comprising a packing box body 1, an adjusting mechanism 2 is arranged inside the packing box body 1, and a pressure relief component 3 is arranged on the top of the packing box body 1;

[0030] The adjustment mechanism 2 includes a sealing component 21 and an anti-accidental touch component 22 . The anti-accidental touch component 22 is arranged on the left side of the sealing component 21 .

[0031] Furthermore, the sealing assembly 21 includes a fixed plate 211, which is fixedly installed inside the packing box body 1. A worm gear 212 is rotatably installed at the bottom of the fixed plate 211, and a threaded tube 213 is threadedly installed inside the worm gear 212. A worm 214 is rotatably installed inside the packing box body 1, and a handwheel 215 is fixedly installed on the left side of the worm 214. A push plate 216 is fixedly installed on the top of the threaded tube 213, and a spring 217 is fixedly installed on the top of the push plate 216. A sealing ring 218 is fixedly installed on the end of the spring 217 away from the push plate 216, and a sealing block 219 is fixedly installed inside the packing box body 1. The elastic force of the spring 217 is used to make the sealing ring 218 and the sealing block 219 fit tightly, so that the sealing between the sealing ring 218 and the sealing block 219 is strengthened.

[0032] Furthermore, the worm 214 is meshed with the worm wheel 212, through holes are opened at corresponding positions of the fixed plate 211 and the threaded tube 213, and the threaded tube 213 passes through the through hole and is fixedly installed with the push plate 216, and the push plate 216 is slidably installed inside the packing box body 1, so that the sealing ring 218 can move upward.

[0033] Furthermore, the anti-mistouch component 22 includes a fixed box 221, which is fixedly installed on the left side of the packing box body 1. A clamping ring 222 is rotatably installed on the left side of the fixed box 221. A fixing buckle 223 is fixedly installed on the bottom of the fixed box 221. A clamping block 224 is rotatably installed on the inner side of the fixing buckle 223. A spring 225 is fixedly installed on the top of the clamping block 224 to prevent the hand wheel 215 from rotating due to accidental touch by the staff, thereby performing secondary limiting on the device and enhancing the sealing effect of the device.

[0034] Furthermore, through holes are provided at corresponding positions of the fixed box 221 and the handwheel 215, and the handwheel 215 passes through the fixed box 221 and is fixedly installed with the worm 214. The end of the spring 225 away from the clamping block 224 is fixedly installed with the fixed box 221. Clamping grooves are provided at corresponding positions of the clamping ring 222 and the clamping block 224, and the clamping grooves are distributed circumferentially with the center position of the clamping ring 222. The clamping ring 222 is fixedly installed on the outside of the handwheel 215, and the clamping ring 222 is clamped to prevent the handwheel 215 from rotating due to accidental touch.

[0035] Embodiment 2:

[0036] See also Figure 5, and combined with Example 1, it is further obtained that the pressure relief assembly 3 includes a cover cap 31, the cover cap 31 is installed on the top of the packing box body 1 through bolt threads, a mounting frame 32 is fixedly installed inside the cover cap 31, a rotating shaft 33 is fixedly installed inside the mounting frame 32, a cover plate 35 is rotatably installed outside the rotating shaft 33, a tension spring 34 is fixedly installed on the inside of the cover plate 35, and a sealing sheet 36 is fixedly installed on the bottom of the cover plate 35. When the internal pressure is large, the hand wheel 215 is turned to prevent the sealing ring 218 from contacting the sealing block 219, and the internal pressure lifts the cover plate 35. After the pressure is released, the cover plate 35 continues to close the pressure relief port through the setting of the tension spring 34, and the sealing sheet 36 fits with the pressure relief port to prevent air leakage at ordinary times.

[0037] Furthermore, a pressure relief port is provided inside the cover cap 31, and the diameter of the sealing sheet 36 is larger than the diameter of the pressure relief port, and one end of the tension spring 34 away from the cover plate 35 is fixedly installed on the mounting frame 32, and the tension spring 34 is arranged on the outside of the rotating shaft 33, and the tension spring 34 enables the cover plate 35 to automatically realize the closing function.

[0038] In actual operation, when the device is used, the clamping block 224 is pushed outward to disengage the clamping block 224 from the clamping position of the clamping ring 222, and the hand wheel 215 is turned. The rotation of the hand wheel 215 drives the worm 214 to rotate, and the rotation of the worm 214 drives the worm 214 meshing therewith to rotate. The rotation of the worm 214 drives the threaded tube 213 to move, so that the push plate 216 pushes the spring 1 217 to push the sealing ring 218 to move, and then the elastic force of the spring 1 217 is used to make the sealing ring 218 and the sealing block 219 fit tightly, so that the sealing between the sealing ring 218 and the sealing block 219 is strengthened, and the clamping block 224 is released. The clamping block 224 is subjected to the elastic force and is clamped into the corresponding position of the clamping ring 222. Inside the clamping groove, the hand wheel 215 is limited, because the worm 214 and the worm wheel 212 themselves have a locking structure to prevent the push plate 216 from moving downward due to gravity. The clamping block 224 is used to clamp the clamping ring 222 to limit the hand wheel 215 to prevent the hand wheel 215 from rotating due to the worm 214 caused by accidental touch of the staff. The device is limited for the second time to enhance the sealing effect of the device. When the internal pressure is high, the hand wheel 215 is turned so that the sealing ring 218 does not contact the sealing block 219, and the internal pressure lifts the cover plate 35. After the pressure is released, the cover plate 35 continues to close the pressure relief port through the setting of the tension spring 34, and the sealing sheet 36 fits with the pressure relief port to prevent air leakage at ordinary times.

[0039] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the statement "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

Claims

1. A petroleum wellhead blowout prevention device, comprising a packing box body (1), characterized in that: An adjusting mechanism (2) is arranged inside the packing box body (1), and a pressure relief component (3) is arranged on the top of the packing box body (1); The adjustment mechanism (2) comprises a sealing component (21) and an anti-accidental touch component (22), wherein the anti-accidental touch component (22) is arranged on the left side of the sealing component (21); The anti-mis-touch component (22) comprises a fixed box (221), the fixed box (221) is fixedly mounted on the left side of the packing box body (1), a clamping ring (222) is rotatably mounted on the left side of the fixed box (221), a fixing buckle (223) is fixedly mounted on the bottom of the fixed box (221), a clamping block (224) is rotatably mounted inside the fixing buckle (223), and a spring 2 (225) is fixedly mounted on the top of the clamping block (224).

2. The oil wellhead blowout prevention device according to claim 1, characterized in that: The sealing assembly (21) comprises a fixing plate (211), the fixing plate (211) being fixedly mounted inside the packing box body (1), a worm wheel (212) being rotatably mounted on the bottom of the fixing plate (211), a threaded tube (213) being threadedly mounted inside the worm wheel (212), a worm (214) being rotatably mounted inside the packing box body (1), a hand wheel (215) being fixedly mounted on the left side of the worm (214), a push plate (216) being fixedly mounted on the top of the threaded tube (213), a spring 1 (217) being fixedly mounted on the top of the push plate (216), a sealing ring (218) being fixedly mounted on one end of the spring 1 (217) away from the push plate (216), and a sealing block (219) being fixedly mounted inside the packing box body (1).

3. A petroleum wellhead blowout prevention device according to claim 2, characterized in that: The worm (214) is meshed with the worm wheel (212); through holes are provided at corresponding positions of the fixing plate (211) and the threaded tube (213); the threaded tube (213) passes through the through hole and is fixedly installed with a push plate (216); and the push plate (216) is slidably installed inside the packing box body (1).

4. The oil wellhead blowout prevention device according to claim 2, characterized in that: A through hole is provided at a position corresponding to the fixed box (221) and the hand wheel (215), and the hand wheel (215) passes through the fixed box (221) and is fixedly installed with the worm (214); one end of the second spring (225) away from the clamping block (224) is fixedly installed with the fixed box (221); a clamping groove is provided at a position corresponding to the clamping ring (222) and the clamping block (224), and the clamping grooves are distributed in a circle at the center position of the clamping ring (222); and the clamping ring (222) is fixedly installed on the outside of the hand wheel (215).

5. The oil wellhead blowout prevention device according to claim 1, characterized in that: The pressure relief assembly (3) comprises a cover cap (31), the cover cap (31) is threadably mounted on the top of the packing box body (1), a mounting frame (32) is fixedly mounted inside the cover cap (31), a rotating shaft (33) is fixedly mounted inside the mounting frame (32), a cover plate (35) is rotatably mounted outside the rotating shaft (33), a tension spring (34) is fixedly mounted inside the cover plate (35), and a sealing sheet (36) is fixedly mounted on the bottom of the cover plate (35).

6. The oil wellhead blowout prevention device according to claim 5, characterized in that: A pressure relief port is provided inside the cover cap (31), and the diameter of the sealing sheet (36) is larger than the diameter of the pressure relief port. One end of the tension spring (34) away from the cover plate (35) is fixedly mounted on the mounting frame (32), and the tension spring (34) is arranged outside the rotating shaft (33).

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