An automatic pressure relief blowout preventer
By incorporating ring blocks, fixed columns, and pressure relief holes into the blowout preventer, automatic pressure relief is achieved, eliminating the risk of explosion caused by high pressure inside the well, ensuring the safety of oil operations, and reducing equipment damage.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- JIANGSU XINDE GASOLINEEUM MACHINERY
- Filing Date
- 2025-07-07
- Publication Date
- 2026-06-09
AI Technical Summary
Existing blowout preventers pose an explosion hazard when the pressure inside the well exceeds the rated pressure after the wellhead is closed, leading to safety risks in oil operations.
An automatic pressure relief blowout preventer is designed. By setting a ring block, a fixed column, an elastic component and a pressure relief hole inside the oil pipe, the pressure inside the oil pipe pushes the ring block to move, exposing the pressure relief hole for pressure relief. Combined with a buffer and a return spring to mitigate instantaneous pulses, safe pressure relief is achieved.
It effectively avoids the risk of explosion caused by high pressure inside the well, and ensures the safety of oil operations and reduces equipment damage through an automatic pressure relief mechanism.
Smart Images
Figure CN224338938U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of automatic pressure relief equipment technology, and in particular to an automatic pressure relief blowout preventer. Background Technology
[0002] A blowout preventer (BOP) is a device used during well testing, workover, and completion operations to close the wellhead and prevent blowouts. It combines full and partial sealing functions into one unit, featuring simple structure, ease of operation, and high-pressure resistance. BOPs are commonly used safety sealing devices in oilfields to prevent blowouts. In practical use, the BOP is installed on the wellhead casing head. When the oil and gas pressure inside the well is very high, the BOP seals the wellhead, ensuring safety during operation.
[0003] However, once the existing blowout preventer closes the wellhead, there is a risk of explosion if the pressure inside the well exceeds the rated pressure of the blowout preventer, which poses a great safety hazard to oil operations. Utility Model Content
[0004] To address the technical problem that existing blowout preventers pose a significant safety hazard to oil operations if the pressure inside the well exceeds the rated pressure of the blowout preventer after it closes the wellhead, this invention provides an automatic pressure relief blowout preventer.
[0005] This utility model is achieved using the following technical solution: an automatic pressure relief blowout preventer includes an oil pipe, on the inner wall of which a first ring block and a second ring block are slidably connected and fixedly connected, the second ring block being located directly above the first ring block, a fixing post being fixedly connected to the top of the first ring block, the fixing post sliding on the second ring block, an elastic component being provided between the first and second ring blocks, a third ring block being fixedly connected to the top of the fixing post, mounting holes being symmetrically opened on the outer side of the oil pipe, a mounting box being fixedly connected in the mounting holes, an abutment block being provided inside the mounting box that contacts the third ring block, and a pressure relief hole being opened at the bottom of the mounting box.
[0006] With the above technical solution, in the initial state, the pressure relief hole at the bottom of the mounting box is completely blocked by the trapezoidal abutment block. At this time, if the pressure inside the oil pipe increases, it will drive the first ring block on the inner wall of the oil pipe to slide towards the top of the oil pipe. The sliding of the first ring block will drive the fixed column to slide on the second slider and push the third ring block to move upward. This causes the third ring block to push the abutment block inside the mounting box to move in the opposite direction inside the mounting box, so that the pressure relief hole inside the mounting box is exposed in the oil pipe channel, achieving the effect of pressure relief.
[0007] As a further improvement to the above solution, the elastic component includes a compression spring fixed between the first ring block and the second ring block, the compression spring being located outside the fixed post.
[0008] Through the above technical solution, the setting of the elastic component can set the internal pressure of the oil pipe according to the elastic force of the spring, and on the other hand, it can restore the first ring block, the third ring block and the contact block to their initial positions.
[0009] As a further improvement to the above scheme, a plurality of buffers arranged in a circular pattern are provided between the first ring block and the second ring block.
[0010] The buffer set between the first and second ring blocks using the above technical solution can mitigate the sudden instantaneous pulse inside the oil pipe, which causes the compression spring inside the oil pipe and the reset spring inside the mounting box to contract to their limits, resulting in some damage.
[0011] As a further improvement to the above solution, a telescopic rod is fixedly connected to the vertically parallel inner side of the mounting box, the abutment block is fixedly connected to the end of the telescopic rod, and a return spring is fixedly connected between the vertically parallel inner side of the mounting box and the abutment block, the return spring being located on the outer side of the telescopic rod.
[0012] With the above technical solution, the reset spring installed on the outside of the telescopic rod inside the installation box can return to the initial position when the contact block is disengaged from the compression of the third ring block.
[0013] As a further improvement to the above solution, the contact block is arranged in a trapezoidal shape, and the surface of the third ring block that contacts the trapezoidal inclined surface of the contact block is arranged with rounded corners.
[0014] The trapezoidal shape of the contact block and the rounded corners of the contact surface of the third ring block, as described above, are designed to facilitate better contact and sliding between the two components.
[0015] As a further improvement to the above solution, the abutment block extends into the oil pipe, and the pressure relief hole is located inside the mounting box and behind the abutment block.
[0016] The above technical solution uses the high pressure inside the oil pipe to push the third ring block to move horizontally into the mounting box, so that the pressure relief hole at the bottom of the mounting box is connected to the inside of the oil pipe, thereby relieving the high pressure inside the oil pipe.
[0017] Compared with the prior art, the beneficial effects of this utility model are as follows:
[0018] This invention uses a first ring block to drive the third ring block at the top of the fixed column to move upward, so that the third ring block simultaneously squeezes a pair of trapezoidal contact blocks, causing the pair of contact blocks to slide inside the mounting box, and connecting the pressure relief hole at the bottom of the mounting box with the inside of the oil pipe, thereby relieving the high pressure inside the oil pipe; the buffer set between the first ring block and the second ring block can mitigate sudden instantaneous pulses inside the oil pipe, which could cause the compression spring inside the oil pipe and the return spring inside the mounting box to contract to their limits, resulting in some damage. Attached Figure Description
[0019] Figure 1 This is a front sectional view of the internal structure of the oil pipe of this utility model;
[0020] Figure 2 This is a side sectional view of the internal structure of the oil pipe of this utility model;
[0021] Figure 3 This is a schematic diagram of the internal structure of the oil pipe of this utility model.
[0022] Explanation of key symbols:
[0023] 1. Oil pipe; 2. First ring block; 3. Second ring block; 4. Fixing post; 5. Third ring block; 6. Mounting hole; 7. Mounting box; 8. Abutment block; 9. Pressure relief hole; 10. Compression spring; 11. Buffer; 12. Telescopic rod; 13. Return spring. Detailed Implementation
[0024] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. It should be noted that, without conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments.
[0025] Please combine Figures 1-3 An automatic pressure relief blowout preventer according to this embodiment includes an oil pipe 1. A first ring block 2 and a second ring block 3 are slidably connected to the inner wall of the oil pipe 1. The second ring block 3 is located directly above the first ring block 2. A fixing post 4 is fixedly connected to the top of the first ring block 2 and slides on the second ring block 3. An elastic component is provided between the first ring block 2 and the second ring block 3. A third ring block 5 is fixedly connected to the top of the fixing post 4. Mounting holes 6 are symmetrically opened on the outer side of the oil pipe 1. A mounting box 7 is fixedly connected in the mounting holes 6. An abutment block 8 that contacts the third ring block 5 is provided inside the mounting box 7. The bottom end of the mounting box 7 is opened... There is a pressure relief hole 9. In the initial state, the pressure relief hole 9 at the bottom of the mounting box 7 is completely blocked by the trapezoidal abutment block 8. At this time, if the pressure inside the oil pipe 1 increases, the pressure inside the oil pipe 1 will drive the first ring block 2 on the inner wall of the oil pipe 1 to slide towards the top of the oil pipe 1. The sliding of the first ring block 2 will drive the fixed column 4 to slide on the second slider and push the third ring block 5 fixed to the top of the fixed column 4 to move upward. This causes the third ring block 5 to push the abutment block 8 inside the mounting box 7 to move in the opposite direction inside the mounting box 7, so that the pressure relief hole 9 inside the mounting box 7 is exposed in the oil pipe 1 channel, achieving the effect of pressure relief.
[0026] Combination Figure 1 and Figure 2The elastic component includes a compression spring 10 fixed between the first ring block 2 and the second ring block 3. The compression spring 10 is located outside the fixed post 4. Multiple buffers 11 arranged in a circular pattern are also provided between the first ring block 2 and the second ring block 3. A telescopic rod 12 is fixedly connected to the vertically parallel inner side of the mounting box 7. An abutment block 8 is fixedly connected to the end of the telescopic rod 12. A return spring 13 is fixedly connected between the vertically parallel inner side of the mounting box 7 and the abutment block 8. The return spring 13 is located outside the telescopic rod 12. Through the arrangement of the elastic component, the spring can adjust the position according to the spring's direction. The spring force is determined by the internal pressure setting of the oil pipe 1. On the other hand, it allows the first ring block 2, the third ring block 5, and the abutment block 8 to return to their initial positions. The buffer 11 set between the first ring block 2 and the second ring block 3 can alleviate the sudden instantaneous pulse inside the oil pipe 1, which causes the compression spring 10 inside the oil pipe 1 and the return spring 13 inside the mounting box 7 to contract to their limits, resulting in some damage. The return spring 13 set on the outside of the telescopic rod 12 inside the mounting box 7 can return to its initial position when the abutment block 8 is disengaged from the compression of the third ring block 5.
[0027] Combination Figure 2 and Figure 3 The contact block 8 is set in a trapezoidal shape, and the surface of the third ring block 5 that contacts the trapezoidal inclined surface of the contact block 8 is set with rounded corners; the trapezoidal shape of the contact block 8 and the rounded corners of the contact surface of the third ring block 5 enable better contact and sliding between the two.
[0028] Combination Figure 2 The contact block 8 extends into the oil pipe 1, and the pressure relief hole 9 is located inside the mounting box 7 and behind the contact block 8. By using the high pressure inside the oil pipe 1 to push the third ring block 5 to push the contact block 8 to move horizontally into the mounting box 7, the pressure relief hole 9 at the bottom of the mounting box 7 is connected to the inside of the oil pipe 1, thereby relieving the high pressure inside the oil pipe 1.
[0029] The implementation principle of an automatic pressure relief blowout preventer in this application embodiment is as follows:
[0030] In the initial state, the pressure relief hole 9 at the bottom of the mounting box 7 is completely blocked by the trapezoidal abutment block 8, and the reset spring 13 and the compression spring 10 between the first ring block 2 and the second ring block 3 inside the mounting box 7 are in the initial uncompressed state.
[0031] If the pressure inside the oil pipe 1 increases at this time, it will cause the first ring block 2 on the inner wall of the oil pipe 1 to slide towards the top of the oil pipe 1. The sliding of the first ring block 2 will cause the fixed column 4 to slide on the second slider and push the third ring block 5 to move upward in the inner wall of the oil pipe 1. At the same time, it will compress the compression spring 10 and the buffer 11 between the first ring block 2 and the second ring block 3. Because symmetrical mounting holes 6 are opened on the outside of the oil pipe 1 and mounting boxes 7 are fixed in the mounting holes 6, when the third ring block 5 moves upward, it will abut against a pair of abutting blocks 8 and slide in opposite directions in the two mounting boxes 7. At the same time, the trapezoidal setting of the abutting blocks 8 and the rounded corners of the contact surface of the third ring block 5 are for better abutting and sliding between the two.
[0032] When the pair of abutting blocks 8 slide in opposite directions inside their respective mounting boxes 7, they compress the return spring 13 while also causing the telescopic rod 12 to retract until the pressure relief hole 9 at the bottom of the mounting box 7 connects with the inside of the oil pipe 1, thereby relieving the high pressure inside the oil pipe 1.
[0033] The above embodiments are merely preferred embodiments of this utility model and should not be construed as limiting the scope of protection of this utility model. Any non-substantial changes and substitutions made by those skilled in the art based on this utility model shall fall within the scope of protection claimed by this utility model.
Claims
1. An automatic pressure relief blowout preventer, characterized in that, The system includes an oil pipe (1), on which a first ring block (2) is slidably connected and a second ring block (3) is fixedly connected. The second ring block (3) is located directly above the first ring block (2). A fixing post (4) is fixedly connected to the top of the first ring block (2). The fixing post (4) slides on the second ring block (3). An elastic component is provided between the first ring block (2) and the second ring block (3). A third ring block (5) is fixedly connected to the top of the fixing post (4). The oil pipe (1) has symmetrically opened mounting holes (6) on the outside. A mounting box (7) is fixedly connected in the mounting hole (6). A contact block (8) that contacts the third ring block (5) is provided inside the mounting box (7). The mounting box (7) has a pressure relief hole (9) at its bottom end.
2. The automatic pressure relief blowout preventer as described in claim 1, characterized in that, The elastic component includes a compression spring (10) fixed between the first ring block (2) and the second ring block (3), the compression spring (10) being located outside the fixed post (4).
3. An automatic pressure relief blowout preventer as described in claim 2, characterized in that, Multiple buffers (11) arranged in a circular pattern are also provided between the first ring block (2) and the second ring block (3).
4. An automatic pressure relief blowout preventer as described in claim 1, characterized in that, The mounting box (7) has a telescopic rod (12) fixedly connected to its vertically parallel inner side. The abutment block (8) is fixedly connected to the end of the telescopic rod (12). A return spring (13) is fixedly connected between the mounting box (7) and the abutment block (8). The return spring (13) is located on the outside of the telescopic rod (12).
5. An automatic pressure relief blowout preventer as described in claim 4, characterized in that, The contact block (8) is trapezoidal, and the surface of the third ring block (5) that contacts the trapezoidal inclined surface of the contact block (8) is rounded.
6. An automatic pressure relief blowout preventer as described in claim 5, characterized in that, The abutment block (8) extends into the oil pipe (1), and the pressure relief hole (9) is located inside the mounting box (7) and behind the abutment block (8).