Hoop and flange double-acting type wellhead connector

Abstract

The hoop and flange double-acting type well mouth connector comprises a well mouth device, one end of the well mouth device is connected with a blowout preventer, and the end, away from the well mouth device, of the blowout preventer is connected with a well drilling four-way joint through a connecting flange. The hoop and flange double-acting type wellhead connector is used for achieving connection and sealing of a wellhead device, a drilling cross joint, a drilling blowout preventer and other equipment in the oil and gas drilling and production process, a channel for drilling operation and oil and gas production is formed, and the safety of oil and gas exploration and development is guaranteed; the problem of sealing failure caused by impact, vibration, bending moment and other loads in long-term field operation is solved.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of oil and gas drilling equipment, and particularly relates to a clamp and flange double-acting wellhead connector. BACKGROUND

[0002] The wellhead connector is a key equipment for oil and gas exploration and development, and is mainly used for connecting and sealing the wellhead device, drilling cross and drilling blowout preventer and other equipment in the oil and gas drilling and production process, forming a channel for drilling operation and oil and gas production, and ensuring the safety of oil and gas exploration and development.

[0003] At present, the wellhead connection is mainly in the form of traditional flange, and the connection between the wellhead devices is realized through flange connection bolts. During the operation, a wrench is used to apply a pre-tightening load to the connection bolts to ensure the reliability of the connection and sealing. With the increasing of the wellbore pressure in the current oil and gas exploration and development, the pressure-bearing capacity of the wellhead equipment is also continuously improved. The connection between the wellhead devices in the traditional flange form cannot meet the needs of the field operation, and mainly has the following shortcomings: 1) the sealing between the traditional wellhead devices is realized by applying a pre-tightening load to the connection flange to extrude the sealing gasket ring. When the high-pressure high-temperature high-sulfur oil and gas well is operated, if the impact and vibration load in the wellbore and the external bending moment load are encountered, the metal sealing between the flanges will fail, and the sealing leakage will occur; 2) the increasing pressure-bearing capacity of the wellhead equipment leads to the increasing size of the equipment interface flange. The wellhead equipment is a large-size thick-walled forging with a complex forging process and unguaranteed performance requirements; 3) the traditional flange connection bolt has a large size, and the pre-tightening load requirement is high. The installation time is long and difficult in the field. SUMMARY

[0004] The purpose of the present application is to provide a clamp and flange double-acting wellhead connector, which is used for connecting and sealing the wellhead device, drilling cross and drilling blowout preventer and other equipment in the oil and gas drilling and production process, forming a channel for drilling operation and oil and gas production, ensuring the safety of oil and gas exploration and development, and solving the problem of sealing failure caused by the impact, vibration and bending moment load during long-term field operation.

[0005] The technical solution adopted by the present application is a clamp and flange double-acting wellhead connector, which comprises a wellhead device. One end of the wellhead device is connected with a blowout preventer. The end of the blowout preventer away from the wellhead device is connected with a drilling cross through a connection flange.

[0006] The present application also has the following characteristics:

[0007] The connection flange comprises an upper device. One end of the upper device is connected with the blowout preventer. The other end of the upper device is connected with a matched lower device through a connection assembly. Oil and gas channels are formed in the center of the upper device and the lower device. Two limiting assemblies are symmetrically arranged at the connection position of the upper device and the lower device.

[0008] The end of the upper device connected with the lower device is a thread flange structure, and the end of the lower device connected with the upper device is a screw flange structure.

[0009] The connecting assembly comprises connecting bolts, two thread holes are symmetrically arranged on the end face of the upper device close to the lower device, the lower device is provided with a plug hole matched with the first thread hole, and each group of thread holes and the corresponding plug hole are respectively provided with a connecting bolt, and the end of each connecting bolt close to the lower device is screwed with a connecting nut.

[0010] The limiting assembly comprises two semicircular ring-shaped inner clamps, the inner diameter of one end of the semicircular ring-shaped inner clamp is smaller than that of the other end, the flange necking portion of the upper device is provided with an upper device clamping groove matched with the semicircular ring-shaped inner clamp, the end with small inner diameter of the semicircular ring-shaped inner clamp is arranged in the corresponding upper device clamping groove, the end with large inner diameter of the semicircular ring-shaped inner clamp is movably attached to the outer wall of the lower device, the inner wall of the semicircular ring-shaped inner clamp is provided with an inner clamp slip tooth, and the two semicircular ring-shaped inner clamps are connected through a connecting block.

[0011] The end of the lower device close to the upper device is threadedly sleeved with an outer clamp matched with the semicircular ring-shaped inner clamp, a portion of the inner wall of the outer clamp is screwed with the outer wall of the upper device, another portion of the inner wall of the outer clamp is attached to the outer wall of the semicircular ring-shaped inner clamp, and the middle portion of each semicircular ring-shaped inner clamp is fixed with the outer clamp by a rotation prevention key.

[0012] The rotation prevention key is a rectangular structure and is provided with two through holes, the upper device is provided with a first outer clamp bolt hole matched with the upper through hole of the rotation prevention key, and the lower device is provided with a second inner clamp bolt hole matched with the upper through hole of the rotation prevention key, and the first outer clamp bolt hole, the second inner clamp bolt hole and the corresponding through holes are jointly provided with a rotation prevention key bolt.

[0013] The outer wall of the outer clamp is circumferentially and equidistantly provided with a plurality of operation holes.

[0014] A metal sealing gasket ring is arranged at the connection position of the oil and gas passage between the upper device and the lower device.

[0015] The beneficial effects of the present application are:

[0016] The clamp and the flange double-acting wellhead connector realizes reliable connection and sealing between wellhead devices through the cooperation of the clamp and the flange, ensures secondary locking through the connection of the clamp with the upper device and the lower device, avoids the risk of sealing failure caused by impact, vibration, bending moment and other loads in long-term field operation, and ensures the safety of oil and gas exploration and development. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is an application schematic diagram of the wellhead flange connection in the field of oil and gas development.

[0018] Figure 2 The schematic diagram of the unlocking state of the clamp of the wellhead connector of the present application;

[0019] Figure 3 The schematic diagram of the mounting state of the wellhead connector of the present application;

[0020] Figure 4 The top view of the inner clamp structure of the wellhead connector of the present application;

[0021] Figure 5 The sectional view of the inner clamp structure of the wellhead connector of the present application.

[0022] In the figure, 1. drilling four-way, 2. connecting flange, 3. blowout preventer, 4. wellhead device, 5. upper device, 6. inner clamp, 7. outer clamp, 8. lower device, 9. anti-rotation key bolt, 10. anti-rotation key, 11. connecting bolt, 12. metal sealing gasket ring, 13. connecting nut, 14. oil and gas passage, 15. upper device clamping groove, 16. first outer clamp bolt hole, 17. operation hole, 18. outer clamp connecting thread, 19. lower device thread, 20. connecting block, 21. second inner clamp bolt hole, 22. inner clamp slip tooth. DETAILED DESCRIPTION

[0023] The present application will be described in detail below in combination with the drawings and specific embodiments.

[0024] The clamp and flange double-acting wellhead connector of the present application, as shown in the figure, comprises a wellhead device 4, the wellhead device 4 is connected with a blowout preventer 3 at one end, and the blowout preventer 3 is connected with a drilling four-way 1 through a connecting flange 2 at the end away from the wellhead device 4. Figure 1

[0025] In oil and gas exploration and development, in order to ensure the safety of operation, a safe channel from the well bottom to the ground needs to be established through the wellhead device 4, the drilling four-way 1, the blowout preventer 3 and other equipment, and the connection and sealing between each wellhead equipment are usually achieved by using the connecting flange 2.

[0026] As shown in the figure, the connecting flange 2 comprises an upper device 5, the upper device 5 is connected with the blowout preventer 3 at one end, and the upper device 5 is connected with a matched lower device 8 through a connecting assembly at the other end, specifically, the connecting assembly comprises a connecting bolt 11, two thread holes are symmetrically provided about the center on the end face of the upper device 5 close to the lower device 8, the lower device 8 is provided with an insertion hole matched with the first thread hole, and the connecting bolt 11 is respectively arranged in each set of thread hole and corresponding insertion hole, and the connecting nut 13 is screwed on the end of each connecting bolt 11 close to the lower device 8. Figure 2

[0027] ​​In use, the connecting bolt 11 is screwed into the threaded bolt hole in the lower end surface of the upper device 5, then the upper device 5 is lifted and slowly lowered until the connecting bolt 11 is aligned with the flange bolt through hole on the lower device 8, and then the upper device 5 is completely seated on the lower device 8, and the connecting nut 13 is tightened on the connecting bolt 11 using a torque wrench.

[0028] The upper device 5 and the lower device 8 are both provided with an oil and gas passage 14 in the center, and the oil and gas passage 14 is connected at the connection between the upper device 5 and the lower device 8, and is provided with a metal sealing gasket ring 12 to ensure sealing.

[0029] The upper device 5 and the lower device 8 are connected at one end of the upper device 5 and the lower device 8, and the other end is a threaded flange structure.

[0030] As shown in Figure 3 The limiting assembly includes two semicircular ring-shaped inner clamps 6, one end of which has a smaller inner diameter than the other end, and the upper device 5 is provided with an upper device clamp groove 15 matched with the semicircular ring-shaped inner clamp 6, and the end with the smaller inner diameter of the semicircular ring-shaped inner clamp 6 is arranged in the corresponding upper device clamp groove 15, and the end with the larger inner diameter of the semicircular ring-shaped inner clamp 6 is movably attached to the outer wall of the lower device 8, and the inner wall of the semicircular ring-shaped inner clamp 6 is provided with an inner clamp slip tooth 22 to tightly hold the upper device 5 and the lower device 8, as shown in Figure 4 The two semicircular ring-shaped inner clamps 6 are connected by a connecting block 20, and the connecting block 20 is a long circular structure, and after the two inner clamps 6 are installed in the upper device clamp groove 15, the two inner clamps 6 are connected as a whole ring through the connecting block 20.

[0031] The lower device 8 is provided with an outer clamp 7 matched with the semicircular ring-shaped inner clamp 6 near the end close to the upper device 5, and the outer clamp 7 is a whole ring structure, and a part of the inner wall of the outer clamp 7 is screwed with the outer wall of the upper device 5, and the other part of the inner wall of the outer clamp 7 is attached to the outer wall of the semicircular ring-shaped inner clamp 6, and the middle of each semicircular ring-shaped inner clamp 6 is fixed with the outer clamp 7 by a rotation prevention key 10, and the rotation prevention key 10 is a rectangular structure and is provided with two through holes, and the lower device 8 is provided with a first outer clamp bolt hole 16 matched with the upper through hole of the rotation prevention key 10, as shown in Figure 5 The upper device 5 is provided with a second inner clamp bolt hole 21 matched with the upper through hole of the rotation prevention key 10, and the first outer clamp bolt hole 16 and the second inner clamp bolt hole 21 are respectively provided with a rotation prevention key bolt 9 in the corresponding through hole.

[0032] After the inner clamp 6 and the outer clamp 7 are installed in place, the anti-rotation key bolt 9 is connected to the second inner clamp bolt hole 21 on the inner clamp 6 through a through hole of the anti-rotation key 10, and the other anti-rotation key bolt 9 is connected to the first outer clamp bolt hole 16 on the outer clamp 7 through the other through hole of the anti-rotation key 10, so that the inner clamp 6 and the outer clamp 7 are connected as a whole, which not only prevents the circumferential rotation of the inner clamp 6, but also further enhances the bending resistance of the wellhead connector.

[0033] The outer wall of the outer clamp 7 is circumferentially equidistantly provided with a plurality of operation holes 17, and the rotation operation can be performed through the operation holes 17 during the connection process.

[0034] The specific working process of the clamp and flange double-acting wellhead connector of the application is as follows:

[0035] When the upper device 5 and the lower device 8 need to be connected to form a safe and reliable oil and gas passage 14, the metal sealing gasket ring 12 is first placed at the sealing surface of the lower device 8, the outer clamp 7 is initially connected with the lower device thread 19 through the outer clamp connection thread 18, then the connection bolt 11 is screwed into the threaded bolt hole in the lower end surface of the upper device 5, then the upper device 5 is lifted and slowly lowered until the connection bolt 11 is aligned with the flange bolt through hole on the lower device 8, and then the upper device 5 is completely seated on the lower device 8, and the connection nut 13 is tightened on the connection bolt 11 to a set pre-tightening torque load by using a torque wrench, as shown in Figure 2 .

[0036] After the upper device 5, the lower device 8 and the metal sealing gasket ring 12 are connected in place by the connection bolt 11 and the connection nut 13, the two half inner clamps 6 are installed into the upper device clamp slot 15 and connected as a whole ring through the connecting block 20, then the outer clamp 7 is connected with the lower device 8 through the outer clamp connection thread 18 and the lower device thread 19, and the rotation operation is performed by using the operation hole 17 provided on the outer clamp 7, when the outer clamp 7 is rotated to be horizontal with the upper end surface of the inner clamp 6, the anti-rotation key 10 is placed on the upper end surface of the outer clamp 7 and the inner clamp 6, then the anti-rotation key bolt 9 is connected to the second inner clamp bolt hole 21 on the inner clamp 6 through a through hole of the anti-rotation key 10, and the other anti-rotation key bolt 9 is connected to the first outer clamp bolt hole 16 on the outer clamp 7 through the other through hole of the anti-rotation key 10, so that the inner clamp 6 and the outer clamp 7 are connected as a whole, as shown in Figure 3 .

[0037] The wellhead connector not only needs to ensure the connection of the upper device 5 and the lower device 8, but also needs to ensure sufficient pre-tightening load to achieve extrusion sealing of the metal sealing gasket ring 12. After the upper device 5, the lower device 8 and the metal sealing gasket ring 12 are tightened by the cooperation of the connecting bolt 11 and the connecting nut 13, the inner clamp 6 and the outer clamp 7 are used to further determine the reliability of the connection and sealing, prevent the sealing from being invalid due to the impact, vibration, bending moment and other loads during long-term field operation, and reduce the risk of oil and gas leakage.

[0038] Embodiment 1

[0039] The clamp and flange double-acting wellhead connector, as shown in Figure 1 , comprises a wellhead device 4, the wellhead device 4 is connected with a blowout preventer 3 at one end, and the blowout preventer 3 is connected with a drilling four-way cross 1 through a connecting flange 2 at an end away from the wellhead device 4.

[0040] In oil and gas exploration and development, in order to ensure the safety of operation, a safe channel from the well bottom to the ground needs to be established through the wellhead device 4, the drilling four-way cross 1, the blowout preventer 3 and other equipment, and the connection and sealing between each wellhead equipment are usually achieved by using the connecting flange 2.

[0041] As shown in Figure 2 , the connecting flange 2 comprises an upper device 5, the upper device 5 is connected with the blowout preventer 3 at one end, and the other end of the upper device 5 is connected with a matched lower device 8 through a connecting assembly. Specifically, the connecting assembly comprises a connecting bolt 11, two threaded holes are symmetrically provided on the end face of the upper device 5 close to the lower device 8 about the center, the lower device 8 is provided with an insertion hole matched with the first threaded hole, and each set of threaded hole and corresponding insertion hole is respectively provided with a connecting bolt 11. One end of each connecting bolt 11 close to the lower device 8 is screwed with a connecting nut 13.

[0042] In use, the connecting bolt 11 is screwed into the threaded bolt hole in the lower end face of the upper device 5, then the upper device 5 is lifted and slowly lowered until the connecting bolt 11 is completely aligned with the flange bolt through hole on the lower device 8, and then the upper device 5 is completely seated on the lower device 8. The connecting nut 13 is tightened with the connecting bolt 11 by using a torque wrench.

[0043] Oil and gas channels 14 are provided in the centers of the upper device 5 and the lower device 8 and are connected, a metal sealing gasket ring 12 is arranged at the connection of the oil and gas channels 14 between the upper device 5 and the lower device 8 to ensure the sealing, and two limiting assemblies are symmetrically arranged at the connection of the upper device 5 and the lower device 8.

[0044] Embodiment 2

[0045] The clamp and flange double-acting wellhead connector, as shown in Figure 1As shown, including wellhead device 4, wellhead device 4 one end is connected with blowout preventer 3, blowout preventer 3 is connected with drilling four ways 1 through connecting flange 2 away from wellhead device 4 one end.

[0046] As Figure 2 As shown, connecting flange 2 includes upper device 5, upper device 5 one end is connected with blowout preventer 3, upper device 5 the other end is connected with the matched lower device 8 through connecting assembly, specifically, connecting assembly includes connecting bolt 11, upper device 5 the end face close to lower device 8 is opened with two thread holes about center symmetry, lower device 8 is opened with the insertion hole matched with the first thread hole, each group of thread holes and corresponding insertion hole is respectively provided with connecting bolt 11, the end of each connecting bolt 11 close to lower device 8 is screwed with connecting nut 13.

[0047] Upper device 5 and lower device 8 center are opened with oil and gas passage 14 that communicates, and the connecting place of oil and gas passage 14 between upper device 5 and lower device 8 is provided with metal sealing gasket ring 12, to ensure the sealing property, and the connecting place of upper device 5 and lower device 8 is symmetrically provided with two limiting assemblies.

[0048] As Figure 3 As shown, limiting assembly includes two half circular ring inner clamps 6, the inner diameter of one end of half circular ring inner clamp 6 is less than the inner diameter of the other end, upper device flange necking place is provided with upper device clamping groove 15 matched with half circular ring inner clamp 6, the inner diameter of one end of half circular ring inner clamp 6 is set in the corresponding upper device clamping groove 15, the inner diameter of the other end of half circular ring inner clamp 6 is movably attached with the outer wall of lower device 8, the inner wall of half circular ring inner clamp 6 is provided with inner clamp slip teeth 22 to tightly hold upper device 5 and lower device 8, two half circular ring inner clamps 6 are connected through connecting block 20, connecting block 20 is long circular structure, after two half inner clamps 6 are installed in upper device clamping groove 15, two half inner clamps 6 are connected as a whole circular ring through connecting block 20.

[0049] Lower device 8 close to the end of upper device 5 is threadedly provided with outer clamp 7 matched with half circular ring inner clamp 6, outer clamp 7 is a whole circular ring structure, a part of the inner wall of outer clamp 7 is screwed with the outer wall of upper device 5, another part of the inner wall of outer clamp 7 is attached with the outer wall of half circular ring inner clamp 6, the middle of each half circular ring inner clamp 6 is fixed with outer clamp 7 by anti-rotation key 10, anti-rotation key 10 is rectangular structure and is provided with two through holes, lower device 8 is provided with first outer clamp bolt hole 16 matched with the upper through hole of anti-rotation key 10, upper device 5 is provided with second inner clamp bolt hole 21 matched with the upper through hole of anti-rotation key 10, first outer clamp bolt hole 16 and second inner clamp bolt hole 21 are respectively and correspondingly provided with anti-rotation key bolt 9 in the through hole.

[0050] After the inner and outer clamps 6 and 7 are installed in place, the anti-rotation key bolts 9 are passed through one of the through holes of the anti-rotation key 10 and connected to the second inner clamp bolt hole 21 on the inner clamp 6, and the other anti-rotation key bolt 9 is passed through the other through hole of the anti-rotation key 10 and connected to the first outer clamp bolt hole 16 on the outer clamp 7, thereby connecting the inner and outer clamps 6 and 7 as a whole, which not only prevents the circumferential rotation of the inner clamp 6, but also further enhances the bending resistance of the wellhead connector.

[0051] Example 3

[0052] Specific working process of the clamp and flange double-acting wellhead connector of the present application:

[0053] When the upper device 5 and the lower device 8 need to be connected to form a safe and reliable oil and gas passage 14, the metal sealing gasket ring 12 is first placed at the sealing surface of the lower device 8, the outer clamp 7 is initially connected to the lower device thread 19 through the outer clamp connection thread 18, and then the connection bolts 11 are screwed into the threaded bolt holes in the lower end surface of the upper device 5. Then the upper device 5 is lifted and slowly lowered until the connection bolts 11 are all aligned with the flange bolt through holes on the lower device 8, and then the upper device 5 is completely seated on the lower device 8. The connection nuts 13 are tightened on the connection bolts 11 to the set pre-tightening torque load using a torque wrench, as shown in Figure 2 .

[0054] After the upper device 5, the lower device 8, and the metal sealing gasket ring 12 are connected in place by the connection bolts 11 and the connection nuts 13, the two half inner clamps 6 are installed into the upper device clamp slot 15 and connected as a whole ring through the connecting block 20. Then the outer clamp 7 is connected to the lower device 8 through the outer clamp connection thread 18 and the lower device thread 19, and the outer clamp 7 is rotated using the operating hole 17 provided on the outer clamp 7. When the outer clamp 7 is rotated to be horizontal with the upper end surface of the inner clamp 6, the anti-rotation key 10 is placed on the upper end surface of the outer clamp 7 and the inner clamp 6. Then the anti-rotation key bolts 9 are passed through one of the through holes of the anti-rotation key 10 and connected to the second inner clamp bolt hole 21 on the inner clamp 6, and the other anti-rotation key bolt 9 is passed through the other through hole of the anti-rotation key 10 and connected to the first outer clamp bolt hole 16 on the outer clamp 7, thereby connecting the inner and outer clamps 6 and 7 as a whole, as shown in Figure 3 .

Claims

1. A dual acting wellhead connector of the clamp and flange type, characterized in that, The wellhead device (4) is connected with the blowout preventer (3) at one end, and the blowout preventer (3) is connected with the drilling four-way cross (1) through the connecting flange (2) at the other end.

2. The dual acting wellhead connector of claim 1, wherein, The connecting flange (2) includes an upper device (5) connected with the blowout preventer (3) at one end, and a lower device (8) connected with the upper device (5) through a connecting assembly at the other end.

3. The dual acting wellhead connector of claim 2, wherein, The connecting flange (2) includes an upper device (5) connected with the blowout preventer (3) at one end, and a lower device (8) connected with the upper device (5) through a connecting assembly at the other end.

4. The dual acting wellhead connector of claim 2, wherein, The connecting flange (2) includes an upper device (5) connected with the blowout preventer (3) at one end, and a lower device (8) connected with the upper device (5) through a connecting assembly at the other end.

5. The dual acting wellhead connector of claim 2, wherein, The connecting assembly includes a connecting bolt (11), and the end face of the upper device (5) close to the lower device (8) is symmetrically provided with two threaded holes about the center, and the lower device (8) is provided with a insertion hole matched with the first threaded hole. The limiting assembly includes two semicircular annular inner clamps (6), one end of which has a smaller inner diameter than the other end, and the flange necking portion of the upper device (5) is provided with an upper device clamping groove (15) matched with the semicircular annular inner clamp (6).

6. The dual acting wellhead connector of claim 5, wherein, The lower device (8) close to the upper device (5) is threadedly provided with an outer clamp (7) matched with the semicircular annular inner clamp (6), and the inner wall of the outer clamp (7) is threadedly connected with the outer wall of the upper device (5) and is in contact with the outer wall of the semicircular annular inner clamp (6).

7. The dual acting wellhead connector of claim 5, wherein, The anti-rotation key (10) is a rectangular structure and is provided with two through holes, the lower device (8) is provided with a first outer clamp bolt hole (16) matched with the upper through hole of the anti-rotation key (10), and the upper device (5) is provided with a second inner clamp bolt hole (21) matched with the upper through hole of the anti-rotation key (10).

8. The dual acting wellhead connector of claim 2, wherein, The outer clamp (7) is provided with a plurality of operation holes (17) equidistantly arranged on the outer wall. The oil and gas passage (14) between the upper device (5) and the lower device (8) is provided with a metal sealing gasket ring (12).

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