Wellhead blowout prevention equipment suitable for internal pressure control and protection of extended reach well drilling

Abstract

The invention discloses a wellhead blowout prevention device suitable for internal pressure regulation and protection of extended reach well drilling, and relates to the technical field of drilling engineering, comprising a blowout preventer body, a drill pipe is arranged inside the blowout preventer body, a partition buffer mechanism and a pressure discharge mechanism are arranged on both sides of the blowout preventer body, the partition buffer mechanism comprises partition top plates arranged on both sides of the drill pipe, the two partition top plates are slidably mounted on the inner wall of the blowout preventer body, the two partition top plates are arranged downwardly in an inclined manner, the outer walls of the two partition top plates are fitted to each other, and one side of the two partition top plates is fitted to the outer wall of the drill pipe; the invention arranges top punch plates on both sides of the blowout preventer body to buffer the impact force of liquid during well surge, and then discharges excess liquid through a liquid discharge groove to avoid excessive pressure in the blowout preventer body, and at the same time, uses the top punch plates on both sides to drive the clamping plates on both sides of the drill pipe to clamp the outer wall of the drill pipe, so that the drill pipe remains stable.

Description

Technical Field

[0001] The present invention relates to the technical field of drilling engineering, and more specifically, to a wellhead blowout prevention device suitable for controlling and protecting the internal pressure of a large-reach well. Background Art

[0002] During the drilling operation, in order to prevent formation fluid from invading the well, the pressure of the drilling fluid column in the wellbore needs to be slightly greater than the formation pressure. However, the pressure difference often changes due to some abnormal factors, and the formation pressure is higher than the drilling fluid column pressure, causing well gushes or blowout accidents. The blowout preventer is the most critical equipment in well control equipment. It is mainly used to control the wellhead pressure during drilling, well repair and oil testing operations. It can effectively prevent the occurrence of blowout accidents and achieve safe production.

[0003] Patent CN112302560B discloses a blowout prevention device that can reduce the kinetic energy of drilling fluid. The kinetic energy of drilling fluid is converted into the kinetic energy of wheel plate rotation and the elastic potential energy of coil spring through the structure of wheel plate and blade, thereby reducing the impact force of drilling fluid in the early stage of well kick and the damage of drilling fluid to gate body, thereby extending the service life of gate body and improving the safety performance of the blowout preventer.

[0004] However, although the above-mentioned patent content has the function of buffering the wellhead blowout prevention, it only blocks part of the liquid impact force during well kick by the structure of the wheel plate and the blades, and still cannot intercept and absorb the liquid impact force. The liquid impact force will still impact the gate body, and the continuous liquid cannot be guided and discharged in time, resulting in excessive pressure in the blowout preventer body. At the same time, there is still a lack of structure that can stabilize the drill pipe during well kick, which can easily cause the drill pipe to be impacted by the liquid during well kick and affect stability.

[0005] In view of the above technical defects, a solution is now provided. Summary of the invention

[0006] In order to overcome the above-mentioned defects of the prior art, the present invention provides a wellhead blowout prevention device suitable for internal pressure regulation and protection in large-displacement well drilling. The device cooperates with a partition buffer mechanism and a pressure relief mechanism, and top punches are arranged on both sides of the inside of the blowout preventer body. The liquid impact force during well surge is absorbed by the top punches on both sides and buffered by the support springs, and then the excess liquid is discharged through the drainage groove opened at the bottom of the blowout preventer body to avoid excessive pressure in the blowout preventer body. At the same time, a clamping mechanism is arranged to assist. When the top punches on both sides are forced to move away from each other, the top punches on both sides drive the clamps on both sides of the drill pipe to clamp the outer wall of the drill pipe, so that the drill pipe remains stable, thereby solving the problems raised in the above-mentioned background technology.

[0007] To achieve the above object, the present invention provides the following technical solution: a wellhead blowout prevention device suitable for internal pressure regulation and protection in extended reach well drilling, comprising a blowout preventer body, a drill pipe is arranged inside the blowout preventer body, and a partition buffer mechanism and a pressure relief mechanism are arranged on both sides of the blowout preventer body;

[0008] The partition buffer mechanism includes partition top plates arranged on both sides of the drill pipe, the two partition top plates are slidably installed on the inner wall of the blowout preventer body, the two partition top plates are arranged at an angle downward, the outer walls of the two partition top plates fit each other, one side of the two partition top plates fits each other with the outer wall of the drill pipe, a limiting spring is fixedly installed on the top of the two partition top plates, one side of the two partition top plates is provided with a top punch plate, the two top punch plates are arranged symmetrically with each other, and the outer walls of the two top punch plates fit each other with the inner wall of the blowout preventer body.

[0009] In a preferred embodiment, a push rod is fixedly installed on one side of the two push plates, the two push rods are arranged in a horizontal state, sleeves are slidably installed on the outer walls of the two push rods, the two sleeves are fixedly installed on the inner wall of the blowout preventer body, support springs are fixedly installed on the inner walls of the two sleeves, and the support springs are fixedly installed on the outer walls of the push rods.

[0010] In a preferred embodiment, a first tooth plate is fixedly installed on one side of the two top punch plates, the two first tooth plates are arranged in a horizontal state, and gears are meshed at the tops of the two first tooth plates. The gears are rotatably installed on the inner wall of the blowout preventer body, and the two gears are symmetrically arranged with each other.

[0011] In a preferred embodiment, the tops of the two gears are respectively meshed with second tooth plates, and the second tooth plates are slidably mounted on the inner wall of the blowout preventer body, a valve plate body is fixedly mounted on one side of the two second tooth plates, the two valve plate bodies are slidably mounted on the inner wall of the blowout preventer body, and the two valve plate bodies are arranged corresponding to the outer wall of the drill pipe.

[0012] In a preferred embodiment, the pressure relief mechanism includes a push plate slidably mounted on the bottom inner wall of the blowout preventer body, the push plate is arranged in a vertical state, the outer walls of the push plate and the top punch plate are arranged corresponding to each other, a cover plate is fixedly mounted on one side of the push plate, the cover plate is arranged in a horizontal state, a top pressure spring is fixedly mounted on the outer wall of the push plate, and the top pressure spring is fixedly mounted on the inner wall of the blowout preventer body.

[0013] In a preferred embodiment, a drainage groove is provided at the bottom of the two cover plates, the drainage groove is opened on the inner wall of the blowout preventer body, the drainage groove is arranged to be inclined downward, and one side of the drainage groove is connected to a collection box.

[0014] In a preferred embodiment, a clamping mechanism is provided on both sides of the drill rod, and the clamping mechanism includes clamping plates arranged on the outer walls of both sides of the drill rod, the two clamping plates are symmetrically arranged with each other, the two clamping plates are arranged in an arc shape, and clamping frames are fixedly installed on both sides of the two clamping plates.

[0015] In a preferred embodiment, the outer walls of the plurality of clamping frames are respectively fixedly mounted with pull-push rods, the plurality of pull-push rods are staggered with each other, the outer walls of the plurality of pull-push rods are sleeved with tube rods, the plurality of tube rods are fixedly mounted on the outer wall of the top punch plate, and a rubber plug is fixedly mounted on one side of the plurality of pull-push rods, and the outer wall of the rubber plug fits with the inner wall of the tube rod.

[0016] Technical effects and advantages of the present invention:

[0017] The present invention arranges top punch plates on both sides of the blowout preventer body, so that the impact force of the liquid during well kick is absorbed by the top punch plates on both sides and buffered by the supporting springs, and then the excess liquid is discharged through the drainage groove provided at the bottom of the blowout preventer body, thereby avoiding the situation where the pressure in the blowout preventer body is too high.

[0018] At the same time, when the top punch plates on both sides are forced to move away from each other, the top punch plates on both sides drive the clamping plates on both sides of the drill rod to clamp the outer wall of the drill rod, so that the drill rod remains stable. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0020] Figure 2 It is an internal front view of the present invention;

[0021] Figure 3 It is a partial cross-sectional view of the present invention;

[0022] Figure 4 It is a vertical cross-sectional view of the present invention;

[0023] Figure 5 is a cross-sectional view of the present invention;

[0024] Figure 6 It is a structural schematic diagram of the clamping mechanism in the present invention;

[0025] Figure 7 It is a partial cross-sectional view of the clamping mechanism in the present invention;

[0026] The accompanying drawings are marked as follows: 1. BOP body; 2. Drill pipe; 3. Partition buffer mechanism; 31. Partition top plate; 32. Limit spring; 33. Push plate; 34. Push rod; 35. Sleeve; 36. Support spring; 37. First tooth plate; 38. Gear; 39. Second tooth plate; 310. Valve plate body; 4. Pressure relief mechanism; 41. Push plate; 42. Cover plate; 43. Push spring; 44. Drain trough; 45. Collecting box; 5. Clamping mechanism; 51. Clamping plate; 52. Clamping frame; 53. Push rod; 54. Cylinder rod; 55. Rubber plug. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] Embodiment 1: In view of the fact that the prior art only blocks part of the liquid impact force during well kick through the structure of the wheel plate and the blades, but cannot intercept and absorb the liquid impact force, the liquid impact force will still impact the gate body, and the continuous liquid cannot be guided and discharged in time, resulting in excessive pressure in the blowout preventer body, in order to solve this problem, the following technical solution is proposed:

[0029] Refer to the instruction manual Figure 1-Figure 7 , suitable for wellhead blowout prevention equipment for internal pressure regulation and protection in extended reach well drilling, such as Figure 1 and Figure 2 As shown, it comprises a blowout preventer body 1, a drill pipe 2 is arranged inside the blowout preventer body 1, the blowout preventer body 1 is installed outside the drill pipe 2, and a partition buffer mechanism 3 and a pressure relief mechanism 4 are arranged on both sides inside the blowout preventer body 1;

[0030] like Figure 2 and Figure 3 As shown, the partition buffer mechanism 3 includes partition top plates 31 arranged on both sides of the drill pipe 2, the two partition top plates 31 are slidably installed on the inner wall of the blowout preventer body 1, the two partition top plates 31 are arranged to be inclined downward, the outer walls of the two partition top plates 31 are in contact with each other, one side of the two partition top plates 31 is in contact with the outer wall of the drill pipe 2, and the top of the two partition top plates 31 is jointly fixedly installed with a limit spring 32. One side of the two partition top plates 31 is provided with a top punch plate 33, the two top punch plates 33 are symmetrically arranged, and the outer walls of the two top punch plates 33 are in contact with the inner wall of the blowout preventer body 1, so that the outer walls of the drill pipe 2 on both sides are squeezed and clamped by the two partition top plates 31 under the pulling force of the limit spring 32, that is, the two partition top plates 31 block the area outside the outer wall of the drill pipe 2.

[0031] like Figure 2 and Figure 3 As shown, a push rod 34 is fixedly installed on one side of the two top punch plates 33, and the two push rods 34 are arranged in a horizontal state. A sleeve 35 is slidably installed on the outer wall of the two push rods 34. The two sleeves 35 are fixedly installed on the inner wall of the blowout preventer body 1, and a support spring 36 is fixedly installed on the inner wall of the two sleeves 35. The support spring 36 is fixedly installed on the outer wall of the push rod 34. When a blowout occurs, a large amount of liquid rushes out from the bottom on both sides of the drill pipe 2. The liquid is blocked by the two partition plates 31 and impacts the top punch plates 33 on both sides. Then, the top punch plates 33 on both sides are forced to move and drive the push rod 34 to compress the support spring 36 and enter the sleeve 35 for buffering.

[0032] like Figure 2 and Figure 3 As shown, a first tooth plate 37 is fixedly installed on one side of the two top punch plates 33, and the two first tooth plates 37 are arranged in a horizontal state. A gear 38 is meshed on the top of the two first tooth plates 37, and the gear 38 is rotatably installed on the inner wall of the blowout preventer body 1. The two gears 38 are symmetrically arranged with each other. At this time, the top punch plates 33 move to drive the first tooth plates 37 to move backward synchronously to push the gear 38 to rotate.

[0033] like Figure 2 and Figure 3 As shown, the tops of the two gears 38 are respectively meshed with second tooth plates 39, and the second tooth plates 39 are slidably mounted on the inner wall of the blowout preventer body 1, and a valve plate body 310 is fixedly mounted on one side of the two second tooth plates 39, and the two valve plate bodies 310 are slidably mounted on the inner wall of the blowout preventer body 1, and the two valve plate bodies 310 and the outer wall of the drill pipe 2 are arranged corresponding to each other, and the gear 38 drives the second tooth plate 39 to move forward and drives the valve plate body 310 to move forward synchronously, and then the valve plate bodies 310 on both sides synchronously clamp the outer wall of the drill pipe 2 for blocking.

[0034] like Figure 3 and Figure 4 As shown, the pressure relief mechanism 4 includes a push plate 41 slidably mounted on the inner wall of the bottom of the blowout preventer body 1, the push plate 41 is arranged in a vertical state, and the outer walls of the push plate 41 and the top punch plate 33 are arranged corresponding to each other. A cover plate 42 is fixedly mounted on one side of the push plate 41, and the cover plate 42 is arranged in a horizontal state. A top pressure spring 43 is fixedly mounted on the outer wall of the push plate 41, and the top pressure spring 43 is fixedly mounted on the inner wall of the blowout preventer body 1. The top punch plate 33 moves backward to push the push plate 41, so that the cover plate 42 moves backward synchronously and compresses the top pressure spring 43.

[0035] like Figure 3 and Figure 4As shown, a drainage groove 44 is provided at the bottom of the two cover plates 42. The drainage groove 44 is opened on the inner wall of the blowout preventer body 1, and the drainage groove 44 is arranged to be inclined downward. One side of the drainage groove 44 is connected to a collection box 45, and then the cover plates 42 are pushed to open the top of the drainage groove 44, that is, the liquid enters the collection box 45 from the drainage groove 44, and the excess liquid is collected and the pressure is buffered by the collection box 45.

[0036] In specific implementation, the blowout preventer body 1 is installed on the outside of the drill pipe 2, and the outer walls of the drill pipe 2 on both sides are squeezed and clamped by the two partition plates 31 under the tension of the limit spring 32, that is, the two partition plates 31 block the area outside the outer wall of the drill pipe 2. When a blowout occurs, a large amount of liquid rushes out from the bottom of the two sides of the drill pipe 2. The liquid is blocked by the two partition plates 31 and impacts the top punch plates 33 on both sides, and then the top punch plates 33 on both sides are forced to move and drive the top rod 34 to compress the support spring 36 and enter the sleeve 35 for buffering;

[0037] At this time, the top punch plate 33 moves to drive the first tooth plate 37 to move backward synchronously, pushing the gear 38 to rotate, and the gear 38 drives the second tooth plate 39 to move forward and drives the valve plate body 310 to move forward synchronously, so that the valve plate bodies 310 on both sides synchronously clamp the outer wall of the drill pipe 2 to block;

[0038] The top punch plate 33 moves backward to push the push plate 41, so that the cover plate 42 moves backward synchronously and compresses the top pressure spring 43, and then the cover plate 42 is pushed to open the top of the drainage groove 44, that is, the liquid enters the collection box 45 from the drainage groove 44, and the excess liquid is collected and the pressure is buffered by the collection box 45.

[0039] Embodiment 2: In view of the fact that the prior art lacks a structure that can stabilize the drill pipe during a well kick, which causes the drill pipe to be impacted by the liquid during a well kick and thus affects stability, the following technical solution is proposed to solve this problem:

[0040] like Figure 6 and Figure 7 As shown, a clamping mechanism 5 is provided on both sides of the drill rod 2, and the clamping mechanism 5 includes clamping plates 51 arranged on the outer walls of both sides of the drill rod 2, the two clamping plates 51 are symmetrically arranged, and the two clamping plates 51 are arranged in an arc shape. A clamping frame 52 is fixedly installed on both sides of the two clamping plates 51, and then the clamping frame 52 drives the clamping plate 51 to approach the outer wall of the drill rod 2.

[0041] like Figure 6 and Figure 7As shown, the outer walls of the plurality of clamping frames 52 are respectively fixedly mounted with pull-push rods 53, the plurality of pull-push rods 53 are staggered, the outer walls of the plurality of pull-push rods 53 are sleeved with tubular rods 54, the plurality of tubular rods 54 are fixedly mounted on the outer wall of the top punch plate 33, and one side of the plurality of pull-push rods 53 is fixedly mounted with rubber plugs 55, the outer wall of the rubber plug 55 and the inner wall of the tubular rod 54 fit together, when the top punch plates 33 on both sides are squeezed away from each other by the liquid, the top punch plates 33 on both sides drive the tubular rod 54 to move synchronously, that is, the tubular rod 54 drives the pull-push rods 53 and the clamping frame 52 so that the clamp plate 51 fits the outer wall of the drill pipe 2;

[0042] When the barrel rod 54 continues to move, the clamping frame 52 on the splint 51 pulls the push rod 53 to make the rubber plug 55 move inside the barrel rod 54, so that negative pressure is generated inside the barrel rod 54, that is, the rubber plug 55 generates a pulling force between the push rod 53 and the barrel rod 54, so that the push rod 53 is driven by the negative pressure pulling force to stably clamp the outer wall of the drill rod 2 by the clamping frame 52 and the splint 51, so that the drill rod 2 remains stable.

[0043] In the specific implementation, when the top punch plates 33 on both sides are squeezed away from each other by the liquid, the top punch plates 33 on both sides drive the barrel rod 54 to move synchronously, that is, the barrel rod 54 drives the push rod 53 and the clamping frame 52 to make the clamping plate 51 fit the outer wall of the drill rod 2, and when the barrel rod 54 continues to move, the clamping frame 52 on the clamping plate 51 pulls the push rod 53 to make the rubber plug 55 move in the barrel rod 54, so that negative pressure is generated in the barrel rod 54, that is, the rubber plug 55 generates a pulling force between the push rod 53 and the barrel rod 54, so that the push rod 53 is driven by the negative pressure pulling force to stably clamp the outer wall of the drill rod 2, so as to facilitate the stability of the drill rod 2.

[0044] Finally, a few points should be explained: First, in the description of this application, it should be noted that, unless otherwise specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, which may refer to mechanical connection or electrical connection, or internal communication between two components, or direct connection. "upper", "lower", "left", "right", etc. are only used to indicate relative positional relationships. When the absolute position of the object being described changes, the relative positional relationship may change;

[0045] Secondly: In the drawings of the embodiments disclosed in the present invention, only the structures related to the embodiments disclosed in the present invention are involved, and other structures can refer to the general design. In the absence of conflict, the same embodiment and different embodiments of the present invention can be combined with each other;

[0046] Finally: The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A wellhead blowout prevention device suitable for controlling the internal pressure of a large-reach well, comprising a blowout preventer body (1), characterized in that: A drill pipe (2) is arranged inside the blowout preventer body (1), and a partition buffer mechanism (3) and a pressure relief mechanism (4) are arranged on both sides inside the blowout preventer body (1); The partition buffer mechanism (3) comprises partition top plates (31) arranged on both sides of the drill pipe (2), the two partition top plates (31) are slidably mounted on the inner wall of the blowout preventer body (1), the two partition top plates (31) are arranged to be inclined downward, the outer walls of the two partition top plates (31) are in contact with each other, one side of the two partition top plates (31) is in contact with the outer wall of the drill pipe (2), a limit spring (32) is fixedly mounted on the top of the two partition top plates (31), one side of the two partition top plates (31) is provided with a top punch plate (33), the two top punch plates (33) are arranged symmetrically, and the outer walls of the two top punch plates (33) are in contact with the inner wall of the blowout preventer body (1); The pressure relief mechanism (4) comprises a push plate (41) slidably mounted on the inner wall of the bottom of the blowout preventer body (1), the push plate (41) being arranged in a vertical state, the push plate (41) and the outer wall of the top punch plate (33) being arranged corresponding to each other, a cover plate (42) being fixedly mounted on one side of the push plate (41), the cover plate (42) being arranged in a horizontal state, a top pressure spring (43) being fixedly mounted on the outer wall of the push plate (41), and the top pressure spring (43) being fixedly mounted on the inner wall of the blowout preventer body (1); A drainage groove (44) is provided at the bottom of the two cover plates (42). The drainage groove (44) is opened on the inner wall of the blowout preventer body (1). The drainage groove (44) is arranged to be inclined downward. One side of the drainage groove (44) is connected to a collection box (45).

2. The wellhead blowout prevention equipment suitable for internal pressure regulation and protection in extended reach well drilling according to claim 1 is characterized in that: A push rod (34) is fixedly mounted on one side of the two push plates (33), the two push rods (34) are arranged in a horizontal state, sleeves (35) are slidably mounted on the outer walls of the two push rods (34), the two sleeves (35) are fixedly mounted on the inner wall of the blowout preventer body (1), support springs (36) are fixedly mounted on the inner walls of the two sleeves (35), and the support springs (36) are fixedly mounted on the outer walls of the push rods (34).

3. The wellhead blowout prevention equipment suitable for internal pressure regulation and protection in extended reach well drilling according to claim 2 is characterized in that: A first tooth plate (37) is fixedly mounted on one side of the two top punch plates (33), the two first tooth plates (37) are arranged in a horizontal state, and a gear (38) is meshed at the top of the two first tooth plates (37), the gear (38) is rotatably mounted on the inner wall of the blowout preventer body (1), and the two gears (38) are arranged symmetrically to each other.

4. The wellhead blowout prevention equipment suitable for internal pressure regulation and protection in extended reach well drilling according to claim 3 is characterized in that: The tops of the two gears (38) are respectively meshed with second tooth plates (39), and the second tooth plates (39) are slidably mounted on the inner wall of the blowout preventer body (1). A valve plate body (310) is fixedly mounted on one side of the two second tooth plates (39), and the two valve plate bodies (310) are slidably mounted on the inner wall of the blowout preventer body (1). The two valve plate bodies (310) and the outer wall of the drill pipe (2) are arranged to correspond to each other.

5. The wellhead blowout prevention equipment suitable for internal pressure regulation and protection in extended reach well drilling according to claim 1 is characterized in that: A clamping mechanism (5) is provided on both sides of the drill rod (2), the clamping mechanism (5) comprising clamping plates (51) provided on the outer walls of both sides of the drill rod (2), the two clamping plates (51) being symmetrically arranged with respect to each other, the two clamping plates (51) being arranged in an arc shape, and clamping frames (52) being fixedly mounted on both sides of the two clamping plates (51).

6. The wellhead blowout prevention equipment suitable for internal pressure regulation and protection in extended reach well drilling according to claim 5 is characterized in that: The outer walls of the plurality of clamping frames (52) are respectively fixedly mounted with pull-push rods (53), the plurality of pull-push rods (53) are arranged staggered with each other, the outer walls of the plurality of pull-push rods (53) are sleeved with a tube rod (54), the plurality of tube rods (54) are fixedly mounted on the outer wall of the top punch plate (33), and a rubber plug (55) is fixedly mounted on one side of the plurality of pull-push rods (53), and the outer wall of the rubber plug (55) is in contact with the inner wall of the tube rod (54).

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