Coated premium fast connect blowout preventer

Abstract

The utility model discloses a multi -head thread quick -witted connection blow -out preventer of taking coating, including connecting pipe, by ren screw nut and hanging platform, connecting pipe top is equipped with female joint, and bottom is equipped with male joint, and the transition connection of male joint and pipe body forms first outer taper surface, and female joint top end face is the inner taper surface that can with first outer taper surface is inlaid, and the first annular boss and second annular boss are equipped on the outer wall of connecting pipe, and the hanging platform is sleeved in connecting pipe, and its top end abuts first annular boss, and bottom end face is the second outer taper surface that with first outer taper surface is connected, and is equipped with multistage annular step, and the ren screw nut is sleeved in hanging platform, and its top end can be connected with second annular boss screw, and its back side is connected with female joint screw, this blow -out preventer not only can realize the quick insertion and fast tool dismounting between blow -out preventer, and satisfy the connection strength and sealing requirement, avoid wellhead installation problem, relative traditional blow -out preventer, improve operation efficiency, reduce maintenance cost, prolong the life.

Description

Technical Field

[0001] This utility model relates to the field of cable blowout preventer technology for oil and water wells, gas wells, logging and bridge-shooting operations, as well as the continuous tubing control technology for blowout preventers, and in particular to a coated multi-threaded quick-connect blowout preventer. Background Technology

[0002] With the continuous development of oil and gas field drilling and development technologies, a series of operational processes such as cable / steel wire perforation, logging, and bridge-fracturing require the installation of complete cable blowout preventers to ensure safe pressurized production operations. Due to the development of shale gas in China, the pressure of oil and gas wells is increasing, and the operating conditions are becoming more complex, making high-pressure wellhead blowout preventers with blowout preventer pipes a promising area for application.

[0003] Existing cable blowout preventers use Bowen and Otis threaded connections, which are inefficient and labor-intensive for workers. Furthermore, traditional blowout preventers are difficult to install and disassemble, prone to corrosion, and have a short service life. Therefore, it is necessary to upgrade the structure of existing cable blowout preventers to significantly improve worker productivity, increase operational efficiency, extend service life, and reduce company costs. Utility Model Content

[0004] The purpose of this invention is to provide a coated multi-threaded quick-connect blowout preventer that solves the above-mentioned technical problems.

[0005] Therefore, the technical solution of this utility model is as follows:

[0006] A coated multi-threaded quick-connect blowout preventer includes a connecting pipe, a union nut, and a mounting bracket. The connecting pipe has a female connector extending axially from its top end and a male connector extending axially from its bottom end. The outer diameter of the male connector is smaller than the outer diameter of the pipe body, and a first outer conical surface is formed at the transition joint. The inner diameter of the female connector matches the outer diameter of the male connector, and its top end face is an inner conical surface that mates with the first outer conical surface. This ensures that when the male connector of one connecting pipe is inserted into the female connector of another connecting pipe, its first outer conical surface fits against the inner conical surface of the female connector. The connecting pipe has a connecting bracket near the male connector. The outer wall of the connector is provided with a first annular boss and a second annular boss at intervals from near to far. The mounting platform is sleeved and fixed on the outside of the connecting pipe, with its top end abutting against the first annular boss and its bottom end face being a second outer conical surface that can connect with the first outer conical surface. Multiple annular steps are machined on the second outer conical surface, so that multiple annular gaps are left when the second outer conical surface is in contact with the inner conical surface, and the annular gaps near the outside are connected to the outside. A nut is sleeved on the outside of the mounting platform, and its top inner wall and the outer wall of the second annular boss are respectively provided with matching connecting threads, and its rear inner wall and the outer wall of the female connector are respectively provided with matching connecting threads.

[0007] Furthermore, the inner diameter of the female connector is larger than the inner diameter of the pipe body, and a second annular step is formed at the transition connection between the two, so that when the male connector of one connecting pipe is inserted into the female connector of another connecting pipe, the end face of the second annular step of the female connector abuts against the bottom end face of the male connector.

[0008] Furthermore, an annular groove containing a retaining ring and a sealing ring is provided on the outer wall of the male connector to form a sealed connection between the two connecting pipes.

[0009] Furthermore, the top outer diameter of the mounting platform is smaller than the bottom outer diameter, and a third annular step is formed at the transition connection between the two. Correspondingly, an inner annular boss is provided on the top inner wall of the union nut, so that when the union nut on one connecting pipe is threaded onto the female connector of another connecting pipe, its inner annular boss abuts against the third annular step.

[0010] Furthermore, the mounting platform is fixed to the connecting pipe by multiple set screws evenly distributed along the circumference.

[0011] Furthermore, the connecting thread adopts a four-thread thread with a pitch of 25.4mm and a self-locking angle of 29°.

[0012] Furthermore, the inner wall of the connecting pipe and the outer wall on which the mounting platform is fitted, the inner wall, inner conical surface and outer wall on which the connecting thread is provided of the female connector, and the outer wall, first outer conical surface and bottom end face of the male connector are all coated with an anti-corrosion and wear-resistant layer; the thickness of the anti-corrosion and wear-resistant layer is 0.1mm~0.2mm.

[0013] Furthermore, the coated multi-threaded quick-connect blowout preventer also includes a male thread protector, which is a cylindrical body with one end closed and an inner diameter adapted to the outer diameter of the female connector. The inner wall of the cylinder is provided with an internal thread adapted to the connecting thread on the outer wall of the female connector, so that the male thread protector can be sleeved and threaded onto the outside of the female connector of the connecting pipe.

[0014] Furthermore, the coated multi-threaded quick-connect blowout preventer also includes a female protective wire, which is a cylinder with an annular boss on one end of its outer wall. Its outer diameter is adapted to the inner diameter of the union nut, and its outer wall is provided with an external thread adapted to the connecting thread of the union nut. The other end of the female protective wire has a groove adapted to the outer diameter of the male connector, so that the other end of the female protective wire is threadedly connected to the inner wall of the union nut end side in a partially inserted manner, and its annular boss abuts against the union nut end side.

[0015] Compared to existing technologies, the advantages of this coated multi-threaded quick-connect blowout preventer include:

[0016] (1) In the connection structure design of the male and female connectors of the blowout preventer, on the one hand, the male and female connectors are designed to achieve plug-in thread connection through the matching inclined surfaces, and by machining double-stage steps on the matching inclined surfaces of the mounting platform, quick insertion and disassembly using tools are achieved; on the other hand, by providing an annular boss on the outer wall of the connecting pipe near the male connector for mating with the union nut, the union nut is moved up and fixed during the loading and unloading process, which facilitates installation and disassembly; the above-mentioned structural improvement design not only meets the requirements of connection strength and sealing effect, but also makes the loading and unloading of the male and female connectors more convenient, avoiding the problem of wellhead installation;

[0017] (2) The blowout preventer adopts a four-threaded connection structure that enables quick connection between its components. By optimizing the pitch and self-locking angle, it can further shorten the installation and disassembly time and improve work efficiency while ensuring connection strength.

[0018] (3) By adding a corrosion-resistant and wear-resistant layer at the key position of its connecting pipe, the blowout preventer can control production costs and prevent corrosion after being put into use, thus improving its service life. Attached Figure Description

[0019] Figure 1 This is a cross-sectional view of the coated multi-threaded quick-connect blowout preventer of this utility model.

[0020] Figure 2 This is a schematic diagram of the initial state structure of the union nut of the coated multi-threaded quick-connect blowout preventer of this utility model on the connecting pipe.

[0021] Figure 3 This is a schematic diagram of the structure of the coated multi-threaded quick-connect blowout preventer of this utility model, in which a union nut is fitted and fixed to the outside of two connecting pipes.

[0022] Figure 4 for Figure 3 A magnified view of a portion of the image;

[0023] Figure 5 This is a partial sectional view of the connecting pipe of the coated multi-threaded quick-connect blowout preventer of this utility model and the four-threaded joint nut.

[0024] Figure 6 This is a schematic diagram showing the application of a corrosion-resistant coating on the connecting pipe body of the multi-threaded quick-connect blowout preventer with coating of this utility model. Detailed Implementation

[0025] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, but the following embodiments are by no means intended to limit the present invention.

[0026] See Figure 1 The coated multi-threaded quick-connect blowout preventer includes a connecting pipe 2, a union nut 4, and a mounting plate 5.

[0027] The connecting pipe 2 is a cylindrical pipe 201, with a female connector 202 extending axially at its top end and a male connector 203 extending axially at its bottom end, and the male connector 203 and the female connector 202 are fitted together.

[0028] Specifically, the outer diameter of the female connector 202 is larger than the outer diameter of the pipe body 201, and a first annular step 204 is formed at the transition connection between the two; and the inner diameter of the female connector 202 is larger than the inner diameter of the pipe body 201, and a second annular step 205 is formed at the transition connection between the two; the outer diameter of the male connector 203 is smaller than the outer diameter of the pipe body 201, and a first outer conical surface 206 is formed at the transition connection between the two; and the outer diameter of the male connector 203 is adapted to the inner diameter of the female connector 202, so that the male connector 203 of one connecting pipe 2 can be directly inserted and connected to the female connector 202 of another connecting pipe 2; in this state, the end face of the second annular step 205 of the female connector 202 abuts against the bottom end face of the male connector 203, that is, the second annular step 205 is used to avoid the transition insertion and mating between the female connector 202 and the male connector 203.

[0029] The top end face of the female connector 202 is an inner conical surface, which can cooperate with the first outer conical surface 206, so that when the male connector 203 of one connecting pipe 2 is inserted and connected to the female connector 202 of another connecting pipe 2, the inner conical surface of the female connector 202 can fit and cooperate with the first outer conical surface 206 of the male connector 203.

[0030] As a preferred technical solution of this embodiment, an annular groove with a built-in retaining ring 6 and a sealing ring 7 is provided on the outer wall of the male connector, so that the outer wall of the male connector 203 on one connecting pipe 2 and the inner wall of the female connector 202 on another connecting pipe 2 form a seal, that is, a sealed insertion is formed between the two connecting pipes 2.

[0031] On the outer wall of the connecting pipe 2 near the male connector 203, a first annular boss 207 and a second annular boss 208 are provided at intervals from near to far. The outer diameter of the first annular boss 207 is smaller than the outer diameter of the second annular boss 208. The axial section of the second annular boss 208 is machined into a trapezoid, and its outer wall surface is provided with connecting external threads. In practical applications, the first annular boss 207 and the second annular boss 208 serve as limiting bosses for the mounting platform 5 and the nut 4, respectively.

[0032] See Figure 2The mounting platform 5 is a cylindrical structure with a top outer diameter smaller than the bottom outer diameter, forming a third annular step at the transition connection between the two. Its bottom end face is a second outer conical surface that can connect with the first outer conical surface 206. The inner diameter of the mounting platform 5 is adapted to the outer diameter of the connecting pipe 2, so that it is fitted on the side of the connecting pipe 2 near the male connector 203, and its top end abuts against the first annular boss 207. The second outer conical surface at its bottom end connects with the first outer conical surface 206 and forms a large-sized outer conical surface that matches the size of the inner conical surface of the female connector 202. This structural design can relatively extend the insertion distance between the male connector 203 and the female connector 202, increasing the stability of their connection. The mounting platform 5 is fixed to the connecting pipe 2 by multiple set screws 3 evenly distributed along the circumference, keeping it in the state where its top end abuts against the first annular boss 207.

[0033] See Figure 3 and Figure 4 The second outer conical surface is machined with two annular steps, so that when the two connecting pipes 2 are inserted and connected, there are two annular gaps between the second outer conical surface of the mounting platform 5 and the inner conical surface of the female connector 202; among them, the annular gap near the outer side forms an annular notch between the mounting platform 5 and the female connector 202 that communicates with the outside, so that when it is necessary to disassemble the two sealed connecting pipes 2, the two connecting pipes 2 can be quickly separated by prying by inserting a disassembly tool into the annular notch, which facilitates the insertion and removal operation.

[0034] The union nut 4 is a cylindrical body with an inner diameter that matches the outer diameter of the mounting platform 5, allowing the union nut 4 to be fitted onto the outside of the mounting platform 5. An inner annular boss is provided on the top inner wall of the union nut 4, with its bottom inner diameter matching the outer diameter of the female connector 202. A matching internal thread is provided on the inner wall, allowing the bottom side of the union nut 4 to be partially fitted and threaded onto the outside of the female connector 202. Simultaneously, the inner annular boss of the union nut 4 abuts against the third annular step in this state, preventing the union nut 4 from detaching from its connecting pipe 2 while limiting the threaded connection length between the union nut 4 and the female connector 202. The top inner diameter of the union nut 4 matches the outer diameter of the second annular boss 208, and a matching internal thread is provided on its inner wall, allowing the union nut 4 to be partially fitted and threaded onto the outside of the second annular boss 208 after moving a certain distance towards the top of the connecting pipe 2.

[0035] Since the connecting pipe 2 is vertically positioned with its female connector facing upwards and its male connector facing downwards in actual use, this structural design allows the blowout preventer to be fully exposed during both insertion and disassembly processes by lifting the union nut 4 and fixing it to the second annular boss 208. This facilitates the installation and removal of the male connector of the connecting pipe 2 with the female connector 202 located below, avoiding the original wellhead installation difficulties.

[0036] See Figure 1 As a preferred technical solution of this embodiment, the coated multi-threaded quick-connect blowout preventer also includes a male threaded protective wire 1 and a female threaded protective wire 8, which are connected to the male and female connectors respectively during storage and transportation of the connecting pipe 2, and are used as a protective structure.

[0037] The male thread protector 1 is a cylindrical body with one end closed. Its inner diameter is adapted to the outer diameter of the female connector, and its inner wall is provided with an internal thread adapted to the external thread on the outer wall of the female connector. In order to protect the female connector by sleeve and threading the male thread protector 1 onto the outside of the female connector of the connecting pipe 2 when the multi-start thread quick-connect blowout preventer with coating is disassembled and placed.

[0038] The female protective wire 8 is a cylinder with an annular boss at one end. Its outer diameter is adapted to the inner diameter of the union nut 4, and its outer wall has an external thread adapted to the internal thread of the union nut 4. A groove adapted to the outer diameter of the male connector is formed on the other end face of the female protective wire 8, allowing the other end of the female protective wire 8 to be threadedly connected to the inner wall of the union nut 4 by partial insertion with the male connector, and the annular boss of the female protective wire 8 abuts against the end of the union nut 4. Similarly, the female protective wire 8 is connected to the union nut 4 in the disassembled and idle state of the coated multi-threaded quick-connect blowout preventer to protect the male connector.

[0039] In the structural design of this coated multi-threaded quick-connect blowout preventer, both the internal and external threads on the connecting pipe 2 and the union nut 4 are four-threaded with a pitch L of 25.4 mm (the spacing between adjacent single-threaded threads l is 6.5 mm) and a self-locking angle of 29°, and a thread roughness of 3.2. Compared with the traditional single-threaded setting, this thread structure only requires 5 rotations to achieve the locking purpose, improving the efficiency of the connection between pipes by 4 times. Although in this embodiment, both the internal and external threads are four-threaded, in practical applications, provided that the connection strength is met, the four-threaded thread can also be replaced with other multi-threaded connection forms that meet the connection requirements, such as double-threaded, triple-threaded, or five-threaded threads.

[0040] To further increase the service life of connecting pipe 2, see Figure 5 The inner wall of the pipe body 201 of the connecting pipe 2, the outer wall of the mounting platform 5, the inner wall, inner conical surface, and outer wall of the female connector 202 with external connecting threads, and the outer wall, first outer conical surface, and bottom end face of the male connector 203 are all coated with an anti-corrosion and wear-resistant layer. The thickness of the anti-corrosion and wear-resistant layer is 0.1mm~0.2mm. In this embodiment, the anti-corrosion and wear-resistant layer is formed by coating and curing a mixture of Everslik 1201 and Everslik 1301.

[0041] To further verify the improved sealing and strength performance of the coated multi-threaded quick-connect blowout preventer, the following test method was used: Using clean water as the medium, pressure tests were conducted on two sealed coated multi-threaded quick-connect blowout preventers at different pressures: rated pressure 105 MPa and strength pressure 158 MPa. After the water pressure stabilized and was greater than or equal to the test pressure, the pressure was maintained for 3 minutes and 15 minutes. Subsequently, the water pressure was reduced to zero. After confirming zero water pressure, the pressure change values ​​monitored in real time by a pressure transmitter connected to a pressure pump during the pressure test were recorded. Specific test results are shown in Table 1.

[0042] Table 1:

[0043] As can be seen from the test results in Table 1, the coated multi-threaded quick-connect blowout preventer of this embodiment showed no visible leakage after the pressure drop test during the pressure test, and there was no leakage at the pipe body connection. Furthermore, it met the well control test standards under different pressures and pressure stabilization times. Specifically, the pressure drop of the rated pressure sealing test was <0.7MPa, and the pressure drop of the strength pressure sealing test (i.e., at 1.5 times the rated pressure, 157.5MPa) was less than 5% of the initial pressure during the pressure holding period. These results demonstrate that the blowout preventer meets the connection strength requirements in the connection structure design of the male and female connectors and has a good sealing effect.

[0044] Furthermore, tests have shown that the coated multi-threaded quick-connect blowout preventer of this embodiment has a lifespan that is at least 3 times longer in service life tests, which also means that maintenance costs are reduced by more than 3 times.

[0045] In summary, this coated multi-threaded quick-connect blowout preventer demonstrates excellent performance in upgrading conventional blowout preventers, significantly reducing worker workload, increasing operational efficiency, extending service life, and lowering enterprise costs.

Claims

1. A coated multi-threaded quick-connect blowout preventer, characterized in that, The system includes a connecting pipe (2), a union nut (4), and a mounting platform (5); wherein, the top end of the connecting pipe (2) extends axially and forms a female connector (202), and its bottom end extends axially and forms a male connector (203) that mates with the female connector (202); the outer diameter of the male connector (203) is smaller than the outer diameter of the pipe body (201), and a first outer conical surface (206) is formed at the transition connection between the two; the inner diameter of the female connector (202) is adapted to the outer diameter of the male connector (203), and its top end face is an inner conical surface that mates with the first outer conical surface (206), so that when the male connector (203) of one connecting pipe (2) is inserted into the female connector (202) of another connecting pipe (2), its first outer conical surface (206) fits against the inner conical surface of the female connector (202); when near On the outer wall of the connecting pipe (2) near the male connector (203), there are a first annular boss (207) and a second annular boss (208) spaced apart from near to far; the hanging platform (5) is sleeved and fixed on the outside of the connecting pipe (2), with its top end abutting against the first annular boss (207), and its bottom end face being a second outer conical surface that can connect with the first outer conical surface (206). Multiple annular steps are machined on the second outer conical surface so that multiple annular gaps are left when the second outer conical surface and the inner conical surface are fitted together, and the annular gaps near the outside are connected to the outside; the nut (4) is sleeved on the outside of the hanging platform (5), and its top inner wall and the outer wall of the second annular boss (208) are respectively provided with matching connecting threads, and its rear inner wall and the outer wall of the female connector (202) are respectively provided with matching connecting threads.

2. The coated multi-threaded quick-connect blowout preventer according to claim 1, characterized in that, The inner diameter of the female connector (202) is larger than the inner diameter of the pipe body (201). A second annular step (205) is formed at the transition connection between the two. When the male connector (203) of one connecting pipe (2) is inserted into the female connector (202) of another connecting pipe (2), the end face of the second annular step (205) of the female connector (202) abuts against the bottom end face of the male connector (203).

3. The coated multi-threaded quick-connect blowout preventer according to claim 1, characterized in that, An annular groove with a built-in retaining ring (6) and sealing ring (7) is provided on the outer wall of the male connector, so that a sealed insertion is formed between the two connecting pipes (2).

4. The coated multi-threaded quick-connect blowout preventer according to claim 1, characterized in that, The top outer diameter of the mounting plate (5) is smaller than the bottom outer diameter, and a third annular step is formed at the transition connection between the two. Correspondingly, an inner annular boss is provided on the top inner wall of the union nut (4), so that when the union nut (4) on one connecting pipe (2) is threaded onto the female connector (202) of another connecting pipe (2), its inner annular boss abuts against the third annular step.

5. The coated multi-threaded quick-connect blowout preventer according to claim 1, characterized in that, The mounting plate (5) is fixed to the connecting pipe (2) by multiple set screws (3) evenly distributed along the circumference.

6. The coated multi-threaded quick-connect blowout preventer according to claim 1, characterized in that, All connecting threads are four-threaded with a pitch of 25.4 mm and a self-locking angle of 29°.

7. The coated multi-threaded quick-connect blowout preventer according to claim 1, characterized in that, On the inner wall of the pipe body (201) of the connecting pipe (2) and the outer wall of the mounting platform (5), on the inner wall, inner conical surface and outer wall of the female connector (202) where the connecting thread is set, on the outer wall, first outer conical surface and bottom end face of the male connector (203), a corrosion-resistant and wear-resistant layer is coated; the thickness of the corrosion-resistant and wear-resistant layer is 0.1mm~0.2mm.

8. The coated multi-threaded quick-connect blowout preventer according to claim 1, characterized in that, It also includes a male thread protector (1), which is a cylindrical body with one end closed and an inner diameter that is adapted to the outer diameter of the female connector. The inner wall of the cylinder is provided with an internal thread that is adapted to the connecting thread on the outer wall of the female connector, so that the male thread protector (1) can be sleeved and threaded to the outside of the female connector of the connecting pipe (2).

9. The coated multi-threaded quick-connect blowout preventer according to claim 1, characterized in that, It also includes a female protective wire (8), which is a cylinder with an annular boss on one end of its outer wall. Its outer diameter is adapted to the inner diameter of the union nut (4), and its outer wall is provided with an external thread adapted to the connecting thread of the union nut (4). The other end face of the female protective wire (8) is provided with a groove adapted to the outer diameter of the male connector, so that the other end of the female protective wire (8) is threadedly connected to the inner wall of the union nut (4) by means of partial insertion with the male connector, and its annular boss abuts against the end side of the union nut (4).

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