Ram blowout preventer and locking device thereof

Abstract

The utility model relates to the technical field of drilling engineering, and particularly discloses a locking device of a flashboard blowout preventer, which comprises a hydraulic cylinder head, the hydraulic cylinder head is provided with an inner hole and an observation groove communicated with the inner hole, the hole wall of the inner hole is provided with at least two first locking petals protruding along the radial direction, and the first locking petals are distributed at intervals along the circumferential direction. A lock groove is formed in the middle of each first lock petal; the manual locking shaft is arranged in the inner hole in a penetrating manner; the locking shaft sleeve is arranged outside the manual locking shaft in a sleeving mode, and second locking petals corresponding to the first locking petals are arranged on the peripheral face of the locking shaft sleeve; the locking rod is used for being arranged in the observation groove in a penetrating mode and inserted into the locking hole so as to drive the locking shaft sleeve and the manual locking shaft to rotate around the axis, and therefore the second locking petal can rotate in the locking groove till the second locking petal is opposite to the first locking petal so as to be locked in the axial direction. The locking device of the flashboard blowout preventer is simple in structure, convenient to operate, safe and reliable, and is not easily locked due to corrosion and other reasons through matched locking of the first locking petal and the second locking petal.

Description

Technical Field

[0001] This utility model relates to the field of drilling engineering technology, and more specifically, to a gate blowout preventer and its locking device. Background Technology

[0002] A gate blowout preventer (BOP) is a core component of well control equipment, primarily used for wellhead pressure control in oil and gas drilling operations to prevent blowouts. A gate BOP mainly consists of a housing, drive assembly (hydraulic / manual), gate assembly, locking device, and sealing mechanism. The hydraulically driven piston pushes the gate to close inwards. After the gate BOP has sealed the well, if prolonged well sealing is required or to prevent the gate from opening due to hydraulic failure, the gate locking device must be used to lock the gate in its position, preventing it from moving outwards under fluctuating pressure within the well and ensuring the stability and reliability of the BOP sealing.

[0003] The existing manual locking method uses the rotation of a trapezoidal reverse thread to achieve self-locking, but the locking process is time-consuming and laborious. In addition, due to the long-term locking and the harsh environment of the well site, the threads may corrode or the locking surface may become stuck, making it difficult to lock or unlock, which in turn causes the blowout preventer to fail to open or close properly.

[0004] In summary, how to effectively solve the problem of low reliability of the manual locking device of the gate blowout preventer is a problem that needs to be solved by those skilled in the art. Utility Model Content

[0005] In view of this, the purpose of this utility model is to provide a gate blowout preventer and its locking device. The structural design of the gate blowout preventer and its locking device can effectively solve the problem of low reliability of the manual locking device of the gate blowout preventer.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A locking device for a gate blowout preventer includes:

[0008] A hydraulic cylinder head, wherein the hydraulic cylinder head is provided with an inner hole and an observation groove communicating with the inner hole, the inner hole wall is provided with at least two radially protruding first locking flaps, each first locking flap is spaced apart circumferentially, and each first locking flap is provided with a locking groove extending circumferentially to both sides of the first locking flap in the middle.

[0009] A manual locking shaft is inserted into the inner hole, and one end of the manual locking shaft is provided with a thread for connecting to the hydraulic cylinder piston of the gate blowout preventer;

[0010] A locking shaft sleeve is fitted over the manual locking shaft. The outer circumferential surface of the locking shaft sleeve is provided with a second locking flap corresponding to each of the first locking flaps. Each of the second locking flaps can be inserted into the gap of each of the first locking flaps and move axially relative to each other to the locking groove. The locking shaft sleeve is provided with a locking hole.

[0011] A locking rod is used to pass through the observation slot and insert into the locking hole to drive the locking shaft sleeve and the manual locking shaft to rotate around the axis, so that the second locking disc rotates in the locking groove until the second locking disc is opposite to the first locking disc to lock axially.

[0012] Optionally, in the locking device of the above-mentioned gate blowout preventer, the inner hole wall is provided with N first locking petals and evenly distributed along the circumference, each first locking petal is fan-shaped and the central angle is 180° / N, where N is a natural number greater than 1;

[0013] The second locking petals are provided in N corresponding numbers and are evenly distributed along the circumference. Each second locking petal is fan-shaped and has a central angle of 180° / N.

[0014] Optionally, in the locking device of the above-mentioned gate blowout preventer, the outer peripheral surface of the manual locking shaft is provided with a locking shaft sealing groove, and a locking shaft sealing ring is provided in the locking shaft sealing groove, and the locking shaft sealing ring is in close contact with the inner peripheral surface of the locking shaft sleeve.

[0015] Optionally, in the locking device of the above-mentioned gate blowout preventer, the inner hole wall is provided with a hydraulic cylinder head sealing groove, and a hydraulic cylinder head sealing ring is installed in the hydraulic cylinder head sealing groove. The hydraulic cylinder head sealing ring is in close contact with the outer peripheral surface of the locking shaft sleeve.

[0016] Optionally, in the locking device of the above-mentioned gate blowout preventer, the locking shaft sleeve includes two separate semi-cylindrical plates, which are fixedly connected.

[0017] Optionally, in the locking device of the above-mentioned gate blowout preventer, at least a portion of the locking rod is a magnetic element, which is magnetically attracted to the cylinder head.

[0018] Optionally, in the locking device of the above-mentioned gate blowout preventer, the outer circumferential surface of the manual locking shaft is provided with two positioning steps, the two positioning steps are arranged opposite each other along the axial direction, and the locking shaft is sleeved between the two positioning steps and axially limited.

[0019] Optionally, in the locking device of the above-mentioned gate blowout preventer, the other end of the manual locking shaft is provided with a square shaft to cooperate with the square hole handwheel.

[0020] Optionally, in the locking device of the above-mentioned gate blowout preventer, the cylinder head is provided with a plurality of observation slots, which are evenly distributed circumferentially.

[0021] The locking device for the gate blowout preventer provided by this utility model includes a hydraulic cylinder head, a manual locking shaft, a locking shaft sleeve, and a locking rod. The cylinder head has an inner hole and an observation groove communicating with the inner hole. The inner hole wall has at least two radially protruding first locking flaps, which are spaced apart circumferentially. The middle of each first locking flap has a locking groove extending circumferentially to both sides of the first locking flap. A manual locking shaft passes through the inner hole, and one end of the manual locking shaft has a thread for connecting with the cylinder piston of the gate blowout preventer. A locking shaft sleeve is fitted over the manual locking shaft. The outer circumferential surface of the locking shaft sleeve is provided with second locking flaps corresponding to each of the first locking flaps. Each second locking flap can be inserted into the gap between each of the first locking flaps and move axially relative to each other to the locking groove. The locking shaft sleeve is provided with a locking hole. A locking rod is used to pass through the observation groove and insert into the locking hole to drive the locking shaft sleeve and the manual locking shaft to rotate around the axis, so that the second locking flaps rotate in the locking grooves until the second locking flaps are opposite to the first locking flaps and are axially locked.

[0022] The locking device for the gate blowout preventer provided by this utility model involves assembling a manual locking shaft connected to the inner hole of the hydraulic cylinder piston of the gate blowout preventer via a pre-drilled thread at its front end. A locking shaft sleeve is installed outside the manual locking shaft. After assembly, the device is placed into the inner hole of the hydraulic cylinder head. The position of the first locking disc is adjusted to ensure that the first and second locking discs do not interfere with each other; that is, the installation process ensures that the first and second locking discs are misaligned and can move freely axially within the inner hole of the hydraulic cylinder head. The hydraulic cylinder head is connected to the hydraulic cylinder. When the gate blowout preventer is closed, the manual locking shaft and its locking shaft sleeve move towards the center of the gate blowout preventer. After the gate blowout preventer is fully closed, the second locking disc moves axially into the locking groove. The locking rod is inserted into the locking hole through the observation slot. Rotating the locking shaft sleeve causes the second locking disc of the sleeve to rotate within the locking groove until it aligns with the first locking disc of the cylinder head. This restricts the axial displacement of the locking shaft sleeve and the manual locking shaft, achieving manual locking of the gate blowout preventer. Unlocking is achieved by reversing the operation. As can be seen, this gate blowout preventer's locking device has a simple structure, is easy to operate, and, through the cooperation of the first and second locking discs, is not easily locked due to corrosion or other reasons, ensuring safety and reliability.

[0023] To achieve the above objectives, this utility model also provides a gate blowout preventer, which includes any of the aforementioned locking devices. Since the locking devices described above have the aforementioned technical effects, the gate blowout preventer with these locking devices should also have corresponding technical effects. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 This is a schematic diagram of the locking device of a gate blowout preventer according to a specific embodiment of the present invention;

[0026] Figure 2 for Figure 1 Schematic diagram of the structure of the intermediate liquid cylinder head;

[0027] Figure 3 for Figure 2 The left view;

[0028] Figure 4 for Figure 1 Schematic diagram of the structure of the locking shaft bushing;

[0029] Figure 5 for Figure 4 The left view;

[0030] Figure 6 for Figure 1 A schematic diagram of the manual locking shaft. Detailed Implementation

[0031] This utility model discloses a gate blowout preventer and its locking device, which is simple in structure, easy to operate, and safe and reliable.

[0032] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0033] Please see Figures 1-6The locking device of the gate blowout preventer provided by this utility model includes a hydraulic cylinder head 1, a locking shaft sleeve 2, a manual locking shaft 3, and a locking rod 4. The hydraulic cylinder head 1 has an inner hole and an observation groove 14 communicating with the inner hole. The inner hole wall has at least two radially protruding first locking flaps 12, which are spaced circumferentially. Each first locking flap 12 has a locking groove 13 extending circumferentially to both sides of its center. Corresponding to the locking groove 13 in the axial direction within the inner hole, a space is formed to accommodate the second locking flap 21. Exemplarily, the hydraulic cylinder head 1 includes a thick flange and a thick-walled cylinder. The hydraulic cylinder head 1 is part of the hydraulic cylinder and functions to seal the hydraulic cylinder and straighten the manual locking shaft 3. In this embodiment, the inner hole structure is adjusted so that the first locking flap 12 is positioned at the front end of the inner hole, near the gate of the gate blowout preventer. For example, the first locking flap 12 is milled at a certain angle to form an inner hole of a certain thickness. The milling length is set according to the stroke of the locking shaft sleeve 2 in the inner hole during the normal opening of the gate blowout preventer. That is, the length of the first locking flap 12 is determined by the maximum displacement of the manual locking shaft 3 when the gate blowout preventer is opened. When the gate blowout preventer is opened from fully closed, the second locking flap 21 moves from the locking groove 13 to the tail end of the first locking flap 12 away from the gate.

[0034] The manual locking shaft 3 is inserted into the inner hole, and one end of the manual locking shaft 3 is provided with a thread 31 for connecting with the hydraulic cylinder piston of the gate blowout preventer.

[0035] The locking shaft sleeve 2 is fitted over the manual locking shaft 3. The outer circumferential surface of the locking shaft sleeve 2 is provided with second locking flaps 21 corresponding to each of the first locking flaps 12. Each second locking flap 21 can be inserted into the gap between two adjacent first locking flaps 12 and move axially relative to each other to the locking groove 13. The locking shaft sleeve 2 is provided with locking holes 22. The design principle of the second locking flaps 21 is the same as that of the first locking flaps 12. To ensure strength, the second locking flaps 21 are machined integrally by turning and milling, without subsequent welding. The locking groove 13 is positioned according to the position of the second locking flaps 21 after the gate blowout preventer is sealed. When the gate blowout preventer is fully closed, the second locking flaps 21 move axially into the locking groove 13. The locking hole 23 is positioned opposite the observation slot 14 after the gate blowout preventer is sealed. The function of the second locking flap 21 is to cooperate with the first locking flap 12 and the locking groove 13. When the first locking flap 12 and the second locking flap 21 are misaligned, they can move freely axially. When the second locking flap 21 rotates a certain angle within the locking groove 13 and is at least partially opposite to the first locking flap 12, it achieves the purpose of axial limiting and locking. For example, the locking holes 22 are located at the tail of the locking shaft sleeve 2, and four are evenly distributed circumferentially to facilitate opening and closing according to the different positions of the staff.

[0036] The locking rod 4 is inserted into the observation slot 14 and the locking hole 22 to drive the locking shaft sleeve 2 and the manual locking shaft 3 to rotate around the axis, thereby causing the second locking flap 21 to rotate within the locking groove 13 until the second locking flap 21 is opposite to the first locking flap 12 to lock. It is understood that the dimensions of the observation slot 14 should meet the rotational stroke required for the locking rod 4 to drive the locking shaft sleeve 2 to lock or unlock. Furthermore, since the locking groove 13 is located in the middle of the first locking flap 12, the second locking flap 21 can rotate within the locking groove 13 until its two ends are opposite to the front and rear parts of the first locking flap 12, thus reliably limiting axial forward or backward movement.

[0037] The locking device of the gate blowout preventer provided by this utility model is assembled by connecting the manual locking shaft 3 to the inner hole of the hydraulic cylinder piston of the gate blowout preventer through the pre-reserved thread 31 at the front end. The locking shaft sleeve 2 is installed outside the manual locking shaft 3. After assembly, it is placed into the inner hole of the hydraulic cylinder head 1. The position of the first locking flap 12 is adjusted to ensure that the first locking flap 12 and the second locking flap 21 do not interfere with each other. That is, the installation process ensures that the first locking flap 12 and the second locking flap 21 are misaligned and can move freely axially in the inner hole of the hydraulic cylinder head 1. The hydraulic cylinder head 1 is connected to the hydraulic cylinder. Specifically, the hydraulic cylinder head 1 is connected to the hydraulic cylinder through the pre-reserved bolt through hole 11 using a double-ended bolt. When the gate blowout preventer is closed, the manual locking shaft 3 and the locking shaft sleeve 2 on it move towards the center of the gate blowout preventer. After the gate blowout preventer is fully closed, the second locking flap 21 moves axially into the locking groove 13. The locking rod 4 is inserted into the locking hole 22 through the observation slot 14. The locking shaft sleeve 2 is rotated, causing the second locking disc 21 of the locking shaft sleeve 2 to rotate within the locking groove 13 of the cylinder head 1 until it aligns with the first locking disc 12 of the cylinder head 1. This restricts the axial displacement of the locking shaft sleeve 2 and the manual locking shaft 3, thus achieving manual locking of the gate blowout preventer. Unlocking is achieved by reversing the operation. It is evident that the locking device of this gate blowout preventer has a simple structure, is easy to operate, and, through the cooperation of the first locking disc 12 and the second locking disc 21, is not easily locked due to corrosion or other reasons, making it safe and reliable.

[0038] In some embodiments, the width of the locking groove 13 is 2-3 mm greater than the width of the second locking flap 21, and the depth of the locking groove 13 is 2-3 mm greater than the height of the second locking flap 21, so as to facilitate alignment when locking. In addition, an unlocking gap is left when under pressure to avoid jamming and further improve reliability.

[0039] In some embodiments, the inner hole wall is provided with N first locking petals 12 evenly distributed circumferentially, each first locking petal 12 being fan-shaped with a central angle of 180° / N, where N is a natural number greater than 1; correspondingly, N second locking petals 21 are provided and evenly distributed circumferentially, each second locking petal 21 being fan-shaped with a central angle of 180° / N. For example, N is 3, meaning the inner hole wall is provided with three first locking petals 12 evenly distributed circumferentially, each first locking petal 12 being fan-shaped with a central angle of 60°, and the central angle between adjacent first locking petals 12 being 60°; correspondingly, N second locking petals 21 are provided and evenly distributed circumferentially, each second locking petal 21 being fan-shaped with a central angle of 60°, and the central angle between adjacent second locking petals 21 being 60°. With this configuration, after the gate blowout preventer is fully closed, the locking rod 4 is inserted into the locking hole, and the locking shaft sleeve 2 is rotated clockwise. The three second locking flaps 21 of the locking shaft sleeve 2 rotate 60° within the locking groove 13 of the cylinder head 1, coinciding with the positions of the three first locking flaps 22 of the cylinder head 1. If their axial projections coincide, the gate blowout preventer can be manually locked. To unlock, it is rotated 60° counterclockwise. This configuration is simple in structure and facilitates the axial relative movement of the first locking flap 12 and the second locking flap 21 when they are misaligned, as well as the axial limiting of the first locking flap 12 and the second locking flap 21 when they are relative.

[0040] In some embodiments, the outer circumferential surface of the manual locking shaft 3 is provided with a locking shaft sealing groove 34, and a locking shaft sealing ring 5 is provided in the locking shaft sealing groove 34. The locking shaft sealing ring 5 is in close contact with the inner circumferential surface of the locking shaft sleeve 2. It can be understood that the thickness of the locking shaft sealing ring 5 is greater than the depth of the locking shaft sealing groove 34, so that the locking shaft sealing ring 5 is pressed between the manual locking shaft 3 and the locking shaft sleeve 2 to achieve a seal between the two.

[0041] In some embodiments, the other end of the manual locking shaft 3 is provided with a square shaft 33 to cooperate with a square hole handwheel.

[0042] In some embodiments, the outer circumferential surface of the manual locking shaft 3 is provided with two positioning steps 32, which are arranged axially opposite to each other. The locking shaft sleeve 2 is disposed between the two positioning steps 32 and is axially limited. For example, the positioning steps 32 are raised steps, which can limit the locking shaft sleeve 2, and the distance between the two positioning steps 32 is the same as the length of the locking shaft sleeve 2. For example, one end of the manual locking shaft 3 is provided with a thread 31, the other end with a square shaft 33, and the middle is provided with two positioning steps 32 for positioning the locking shaft sleeve 2.

[0043] In some embodiments, the locking shaft sleeve 2 includes two separate semi-cylindrical pieces, which are fixedly connected. For ease of assembly and maintenance, the locking shaft sleeve 2 is divided into two equal pieces, which can be cut from the middle portion after machining.

[0044] In one example, during the assembly of the locking device of the gate blowout preventer, the locking shaft sealing ring 5 is first placed in the locking shaft sealing groove 34, and then the two locking shaft bushings 2 are gently tapped into the two positioning steps 32 using a copper rod. After assembly, they are inserted into the inner hole of the hydraulic cylinder head 1, with the first locking flap 12 and the second locking flap 21 in a staggered fit.

[0045] In some embodiments, the inner wall of the bore is provided with a hydraulic cylinder head sealing groove 15, and a hydraulic cylinder head sealing ring 6 is installed in the hydraulic cylinder head sealing groove 15. The hydraulic cylinder head sealing ring 6 is in close contact with the outer peripheral surface of the locking shaft sleeve 2. It can be understood that the thickness of the hydraulic cylinder head sealing ring 6 is greater than the depth of the hydraulic cylinder head sealing groove 15, so that the hydraulic cylinder head sealing ring 6 is pressed between the hydraulic cylinder head 1 and the locking shaft sleeve 2 to achieve a seal between the two.

[0046] In some embodiments, at least a portion of the locking rod 4 is a magnetic element, magnetically adsorbed onto the cylinder head. The locking rod 4 may be rod-shaped and contain magnetic material. When not in use, the locking rod 4 is magnetically attracted to both sides of the cylinder head 1 for easy storage and convenient removal during use. For ease of operation, two locking rods 4 are provided, and the locking shaft sleeve 2 is correspondingly provided with two locking holes 22.

[0047] In some embodiments, the cylinder head 1 is provided with a plurality of observation slots 14, which are evenly distributed circumferentially. The four observation slots of the cylinder head are evenly distributed circumferentially to facilitate observation of the locking state and the insertion of the locking rod 4. Specifically, the observation slots 14 are located at the tail cylinder head position, with four evenly arranged circumferentially to facilitate observation of the switch state and to facilitate operation of the locking rod 4 when locking.

[0048] Based on the locking devices provided in the above embodiments, this utility model also provides a gate blowout preventer, which includes any one of the locking devices in the above embodiments. Since this gate blowout preventer uses the locking devices in the above embodiments, the beneficial effects of this gate blowout preventer can be found in the above embodiments.

[0049] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0050] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A locking device for a gate blowout preventer, characterized in that, include: The cylinder head (1) is provided with an inner hole and an observation groove (14) communicating with the inner hole. The inner hole wall is provided with at least two radially protruding first locking flaps (12). Each first locking flap (12) is distributed circumferentially. Each first locking flap (12) has a locking groove (13) extending circumferentially to both sides of the first locking flap (12) in the middle. A manual locking shaft (3) is inserted into the inner hole, and one end of the manual locking shaft (3) is provided with a thread (31) for connecting with the hydraulic cylinder piston of the gate blowout preventer. A locking shaft sleeve (2) is fitted over the manual locking shaft (3). The outer circumferential surface of the locking shaft sleeve (2) is provided with a second locking flap (21) corresponding to each of the first locking flaps (12). Each second locking flap (21) can be inserted into the gap of each of the first locking flaps (12) and move axially relative to each other to the locking groove (13). The locking shaft sleeve (2) is provided with a locking hole (22). The locking rod (4) is used to pass through the observation groove (14) and insert into the locking hole (22) to drive the locking shaft sleeve (2) and the manual locking shaft (3) to rotate around the axis so that the second locking petal (21) rotates in the locking groove (13) until the second locking petal (21) and the first locking petal (12) are opposite to each other and locked axially.

2. The locking device for the gate blowout preventer according to claim 1, characterized in that, The inner hole has N first locking petals (12) on its wall and they are evenly distributed along the circumference. Each first locking petal (12) is fan-shaped and has a central angle of 180° / N, where N is a natural number greater than 1. The second locking petal (21) is provided in N and is evenly distributed along the circumference. Each second locking petal (21) is fan-shaped and has a central angle of 180° / N.

3. The locking device for the gate blowout preventer according to claim 1, characterized in that, The outer circumferential surface of the manual locking shaft (3) is provided with a locking shaft sealing groove (34), and a locking shaft sealing ring (5) is provided in the locking shaft sealing groove (34). The locking shaft sealing ring (5) is in close contact with the inner circumferential surface of the locking shaft sleeve (2).

4. The locking device for the gate blowout preventer according to claim 1, characterized in that, The inner hole wall is provided with a liquid cylinder head sealing groove (15), and a liquid cylinder head sealing ring (6) is provided in the liquid cylinder head sealing groove (15). The liquid cylinder head sealing ring (6) is in close contact with the outer peripheral surface of the locking shaft sleeve (2).

5. The locking device for the gate blowout preventer according to any one of claims 1-4, characterized in that, The locking shaft sleeve (2) includes two separate semi-cylindrical pieces, which are fixedly connected.

6. The locking device for the gate blowout preventer according to any one of claims 1-4, characterized in that, At least a portion of the locking rod (4) is a magnetic element, so as to be magnetically attracted to the cylinder head (1).

7. The locking device for the gate blowout preventer according to any one of claims 1-4, characterized in that, The outer circumferential surface of the manual locking shaft (3) is provided with two positioning steps (32), the two positioning steps (32) are arranged opposite each other along the axial direction, and the locking shaft sleeve (2) is located between the two positioning steps (32) and is axially limited.

8. The locking device for the gate blowout preventer according to any one of claims 1-4, characterized in that, The other end of the manual locking shaft (3) is provided with a square shaft (33) to cooperate with the square hole handwheel.

9. The locking device for the gate blowout preventer according to any one of claims 1-4, characterized in that, The liquid cylinder head (1) is provided with a plurality of observation slots (14), which are evenly distributed circumferentially.

10. A gate blowout preventer, characterized in that, Includes the locking device as described in any one of claims 1-9.

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