A device for wellhead and Christmas tree pressure tap test and expansion tap

Abstract

This invention belongs to the field of oil and gas extraction technology and discloses a device for live borehole testing and borehole enlargement of wellhead equipment and wellhead trees. The device includes a wellhead cap, one end of which is bolted to a lower flange. A polished rod is slidably mounted on the inner side of the lower flange. This invention, through the combination of the polished rod and borehole hammer structure, facilitates the cleaning of the internal passages of valve gates by testing the borehole under pressure. Simultaneously, it allows direct observation of the internal condition of the inlet valve via a pressure gauge, ensuring operational safety, effectively improving cleaning efficiency, and guaranteeing cleaning results. Furthermore, the equipment is simple to install and operate, can perform live operations, and is suitable for situations where wellhead pressure cannot be released during well site trial production or subsequent production.

Description

Technical Field

[0001] This invention belongs to the field of oil and gas extraction technology, specifically a device for pressure borehole testing and borehole enlargement of wellhead equipment and wellhead trees. Background Technology

[0002] With the continuous development of the oil and gas industry, wellheads are widely used in oil and gas production, and the safety regulations for wellhead use in the field are strict. During the oil and gas production process, the conditions at the bottom of the well are varied, and the deployment and retrieval of downhole tools pass through the wellhead. Ensuring the diameter of the wellhead is particularly important. Generally, wellheads are only required to undergo a diameter test when they leave the factory to ensure that the diameter can smoothly pass through the tools.

[0003] In existing technologies, impurities, sludge, ice crystals, etc., brought out from the bottom of the well during oil (gas) production or when tools are deployed downhole can accumulate in the direction of the gate valve's flow path over a long period, forming hardened grease. The current on-site solution is to connect a pump truck water pipe to the side of the wellhead and use a large amount of clean water to flush it. However, this method cannot completely clean the inside of the valve, and it is impossible to observe the inside of the wellhead valve under pressure, so it is impossible to determine whether the flow path is normal. Therefore, it is very important to test the flow path and clean the inside of the gate valve under pressure.

[0004] Therefore, a device for pressure bore testing and bore enlargement of wellhead equipment and wellhead trees is proposed to solve the problems raised in the background art. Summary of the Invention

[0005] To address the problems mentioned in the background section, this invention provides an apparatus for pressure bore testing and bore enlargement of wellhead equipment and wellhead trees.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a device for wellhead equipment and wellhead tree pressurized bore diameter testing and bore diameter enlargement, comprising a wellhead cap, a lower flange fixedly installed at one end of the wellhead cap by bolts, a polished rod slidably arranged on the inner side of the lower flange, and a first locking ring spliced ​​on one side of the middle of the polished rod, a second locking ring arranged on the side of the first locking ring near the polished rod, the first locking ring and the second locking ring being connected by a plurality of sets of internal hexagonal screws, and adjusting plates fixedly connected to both ends of the first locking ring and the second locking ring, an adjusting screw movably arranged on the inner side of the adjusting plate, and a second nut movably sleeved on the outer side of the adjusting screw, the second nut being spliced ​​in the middle of the two sets of adjusting plates;

[0007] A take-out head is movably installed at one end of the polished rod near the oil well cap, and a connecting pin is provided at the joint between the take-out head and the end of the polished rod.

[0008] Preferably, a caliper hammer is spliced ​​and installed at the end of the extraction head away from the polished rod, and the caliper hammer is slidably located inside the oil well cap.

[0009] Preferably, a third nut is movably installed on the outer side of the optical rod away from the extraction head, and an upper flange is movably provided on the outer side of the optical rod, with the adjusting screw rotatably located on the inner side of the upper flange.

[0010] Preferably, two sets of tie rods are spliced ​​between the upper flange and the lower flange, and a first nut is movably provided on the outer side of the end of the tie rod. The first nut is located on the side of the upper flange and the lower flange away from the adjusting plate.

[0011] Preferably, a rod seal is spliced ​​on the inner side of the upper flange, the smooth rod is slidably disposed on the inner side of the rod seal, a rod sealing gasket is spliced ​​on the inner side of the upper flange, the smooth rod is slidably disposed on the inner side of the rod sealing gasket, the rod sealing gasket is located on the side of the rod seal closer to the lower flange, and a packing gland is assembled on the side of the rod sealing gasket away from the rod seal, and the packing gland is fixedly disposed on the inner side of one end of the upper flange.

[0012] Preferably, a hydraulic balance pipe is threadedly fixed to the inner side of the upper flange at the end away from the lower flange, and a lifting joint is threadedly fixed to the outer side of the hydraulic balance pipe at the end away from the upper flange.

[0013] Preferably, a plug is embedded on one side of the lifting joint, and a connecting ring is threaded onto the end of the lifting joint away from the hydraulic balance pipe.

[0014] Preferably, a first shut-off valve is sealed and installed on one side of the lower flange and the upper flange, and a first pressure gauge is fixedly installed on the end of the first shut-off valve away from the polished rod.

[0015] Preferably, a ferrule fitting is sealed on the other side of the lower flange and the upper flange, and a hydraulic control line is embedded in the inner side of the end of the ferrule fitting away from the upper flange and the lower flange.

[0016] Preferably, a second shut-off valve is provided in the middle section of the hydraulic control pipeline, and a tee is provided in the middle section of the hydraulic control pipeline, with the tee located on one side of the second shut-off valve. A second pressure gauge is installed on the side of the tee closest to the guide rod.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0018] This invention, through the combination of a polished rod and a bore hammer structure, facilitates the cleaning of the internal channels of the valve gate by testing the bore under pressure. Simultaneously, it allows direct observation of the internal condition of the inlet valve via a pressure gauge, ensuring operational safety. The upper and lower flanges, along with a tie rod, restrict the internal structure. Connecting the hydraulic control line to these flanges allows for adjustment and observation of the internal pressure using a second shut-off valve and pressure gauge, facilitating pressure testing. Furthermore, adjusting the screw controls the first and second locking rings, which in turn move the polished rod along the internal channels of the wellhead cap, effectively cleaning the valve body. This significantly improves cleaning efficiency and ensures thorough cleaning. The equipment is simple to install and operate, can be used for pressurized operations, and is suitable for situations where wellhead pressure cannot be released during well site testing or subsequent production. Attached Figure Description

[0019] Figure 1 This is a schematic cross-sectional view of the present invention;

[0020] Figure 2 This is a schematic diagram of the cross-section of the bore hammer of the present invention;

[0021] Figure 3 For the present invention Figure 2 Enlarged cross-section diagram at point A;

[0022] Figure 4 For the present invention Figure 2 Enlarged cross-section diagram at point B;

[0023] Figure 5 For the present invention Figure 2 Enlarged cross-section diagram at point C;

[0024] Figure 6 For the present invention Figure 2 Enlarged cross-section diagram at point D;

[0025] Figure 7 This is a schematic cross-sectional view of the ferrule connector of the present invention.

[0026] In the diagram: 1. Blind hammer; 2. Polished rod; 3. First shut-off valve; 4. First pressure gauge; 5. First nut; 6. Lower flange; 7. First locking ring; 8. Adjusting plate; 9. Hex socket head cap screw; 10. Second nut; 11. Adjusting screw; 12. Tie rod; 13. Packing gland; 14. Rod sealing gasket; 15. Rod seal; 16. Upper flange; 17. Hydraulic balance pipe; 18. Third nut; 19. Lifting joint; 20. Plug; 21. Connecting ring; 22. Second locking ring; 23. Hydraulic control line; 24. Connecting pin; 25. Take-out head; 26. Compression fitting; 27. Second shut-off valve; 28. Tee; 29. ​​Second pressure gauge; 30. Oil production tree cap. Detailed Implementation

[0027] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0028] like Figures 1 to 7 As shown, the present invention provides a device for wellhead equipment and wellhead pressurized borehole testing and borehole enlargement, including a wellhead cap 30. One end of the wellhead cap 30 is fixedly installed with a lower flange 6 by bolts. A polished rod 2 is slidably arranged on the inner side of the lower flange 6. A first locking ring 7 is spliced ​​on one side of the middle of the polished rod 2. A second locking ring 22 is arranged on the side of the first locking ring 7 near the polished rod 2. The first locking ring 7 and the second locking ring 22 are connected by several sets of internal hexagonal screws 9. Adjusting plates 8 are fixedly connected to both ends of the first locking ring 7 and the second locking ring 22. An adjusting screw 11 is movably arranged on the inner side of the adjusting plate 8. A second nut 10 is movably sleeved on the outer side of the adjusting screw 11. The second nut 10 is spliced ​​in the middle of the two sets of adjusting plates 8.

[0029] A take-out head 25 is movably installed at one end of the polished rod 2 near the oil production tree cap 30, and a connecting pin 24 is provided at the joint between the take-out head 25 and the end of the polished rod 2.

[0030] Using the above scheme: The lower flange 6 can be connected to the valve structure of the tree cap 30 via bolts. After connection, cleaning can be performed. The polished rod 2 provides an installation position for the outer structure and can slide along the inner side of the upper flange 16 and the lower flange 6, thereby pushing the bore hammer 1 into the interior of the tree cap 30. The first locking ring 7 and the second locking ring 22, together with the hexagonal screw 9, can be fixed to the outside of the polished rod 2. The tightness of the contact with the polished rod 2 can be adjusted by adjusting the hexagonal screw 9. The valve bore is tested to see if it is qualified. If jamming occurs... Adjust the tightness of the two sets of locking sleeves, quickly lower the guide rod 2, and use the spiral groove on the outer diameter of the guide hammer 1 to remove impurities from the guide surface to achieve a cleaning effect. The adjusting plate 8 is used to restrict the adjusting screw 11, and the second nut 10 set between the adjusting plates 8 can push the first locking ring 7, the second locking ring 22 and the guide rod 2 to move when the adjusting screw 11 rotates, so as to achieve the effect of pushing the guide hammer 1 to clean. It is convenient to remove the head 25 to connect the guide rod 2 and the guide hammer 1, and it is convenient to connect the pin 24 to achieve the splicing and locking effect.

[0031] like Figure 3 and Figure 6As shown, a borehole hammer 1 is spliced ​​and installed at the end of the head 25 away from the polished rod 2, and the borehole hammer 1 is slidably located inside the oil production tree cap 30.

[0032] A third nut 18 is movably installed on the outer side of the end of the bare rod 2 away from the extraction head 25, and an upper flange 16 is movably provided on the outer side of the bare rod 2, with the adjusting screw 11 rotatably located on the inner side of the upper flange 16.

[0033] Two sets of tie rods 12 are spliced ​​between the upper flange 16 and the lower flange 6, and a first nut 5 is movably installed on the outer side of the end of the tie rod 12. The first nut 5 is located on the side of the upper flange 16 and the lower flange 6 away from the adjusting plate 8.

[0034] Using the above scheme: the inside of the valve body of the oil well cap 30 can be cleaned by sliding the bore hammer 1; the third nut 18 is used to restrict the polished rod 2 to prevent it from sliding out; the range between the upper flange 16 and the lower flange 6 can be restricted by the cooperation of the tie rod 12 and the first nut 5 to maintain the stability of the structure.

[0035] like Figure 4 - Figure 6 As shown, a rod seal 15 is spliced ​​on the inner side of the upper flange 16, and a smooth rod 2 is slidably disposed on the inner side of the rod seal 15. A rod sealing gasket 14 is spliced ​​on the inner side of the upper flange 16, and the smooth rod 2 is slidably disposed on the inner side of the rod sealing gasket 14. The rod sealing gasket 14 is located on the side of the rod seal 15 closer to the lower flange 6. A packing gland 13 is assembled on the side of the rod sealing gasket 14 away from the rod seal 15, and the packing gland 13 is fixedly disposed on the inner side of one end of the upper flange 16.

[0036] A hydraulic balance pipe 17 is threadedly fixed to the inner side of the upper flange 16 away from the lower flange 6, and a lifting joint 19 is threadedly fixed to the outer side of the hydraulic balance pipe 17 away from the upper flange 16.

[0037] A plug 20 is embedded on one side of the lifting joint 19, and a connecting ring 21 is threaded on the end of the lifting joint 19 away from the hydraulic balance pipe 17.

[0038] Using the above scheme: the rod seal 15 and the rod seal gasket 14 can be used to compress the bare rod 2 to maintain a sealed state, which is convenient for the packing gland 13 to display the rod seal 15 and prevent it from falling off. The hydraulic balance pipe 17 can be used to adjust the hydraulic balance. The lifting joint 19 is used to connect the connecting ring 21 to the external suspension device. The height of the connecting ring 21 can be raised through the suspension device. The plug 20 is used to seal the opening for easy maintenance.

[0039] like Figure 2 and Figure 7As shown, a first shut-off valve 3 is sealed and installed on one side of the lower flange 6 and the upper flange 16, and a first pressure gauge 4 is fixedly installed on the end of the first shut-off valve 3 away from the polished rod 2.

[0040] A compression fitting 26 is sealed on the other side of the lower flange 6 and the upper flange 16. A hydraulic control line 23 is embedded inside the end of the compression fitting 26 away from the upper flange 16 and the lower flange 6.

[0041] A second shut-off valve 27 is provided in the middle section of the hydraulic control line 23, and a tee 28 is provided in the middle section of the hydraulic control line 23. The tee 28 is located on one side of the second shut-off valve 27, and a second pressure gauge 29 is installed on the side of the tee 28 near the polished rod 2.

[0042] Using the above scheme: the first shut-off valve 3 can control the internal pressure, the first pressure gauge 4 can assist the staff in observing the internal pressure status, the compression fitting 26 is used to connect the hydraulic control line 23 to the flange structure to ensure that gas can be transmitted through the second pressure gauge 29 to provide status prompts to the staff, and the tee 28 is used to transmit gas into the second pressure gauge 29.

[0043] The working principle and usage process of this invention are as follows: Open the second shut-off valve 27 on the hydraulic control line 23 connecting the upper flange 16 and the lower flange 6 to balance the pressure of the wellhead oil (gas) tree with the internal pressure of the upper tubing. Adjust the first locking ring 7 and the second locking ring 22 between the upper flange 16 and the lower flange 6 to push the polished rod 2 and the caliper hammer 1 downward into the main caliper of the oil (gas) tree. Continue to lower it down and test whether the valve caliper is qualified. If there is any obstruction, adjust the tightness of the hexagonal screw 9 and quickly lower the polished rod 2. Use the spiral on the outer diameter of the caliper hammer 1 to remove impurities from the caliper surface to achieve a cleaning effect.

[0044] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0045] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A device for testing and enlarging the borehole diameter of wellhead equipment and Christmas trees, comprising a Christmas tree cap (30), characterized in that: One end of the oil well cap (30) is fixedly installed with a lower flange (6) by bolts. A smooth rod (2) is slidably arranged on the inner side of the lower flange (6). A first locking ring (7) is spliced ​​on one side of the middle part of the smooth rod (2). A second locking ring (22) is arranged on the side of the first locking ring (7) close to the smooth rod (2). The first locking ring (7) and the second locking ring (22) are connected by several sets of internal hexagonal screws (9). An adjusting plate (8) is fixedly connected to both ends of the first locking ring (7) and the second locking ring (22). An adjusting screw (11) is movably arranged on the inner side of the adjusting plate (8). A second nut (10) is movably sleeved on the outer side of the adjusting screw (11). The second nut (10) is spliced ​​in the middle of the two sets of the adjusting plates (8). The polished rod (2) is movably fitted with a take-out head (25) at one end near the oil production tree cap (30), and a connecting pin (24) is provided at the joint between the take-out head (25) and the end of the polished rod (2).

2. The device for pressure bore testing and bore enlargement of wellhead equipment and wellhead trees according to claim 1, characterized in that: The extraction head (25) is spliced ​​with a caliper hammer (1) at one end away from the polished rod (2), and the caliper hammer (1) slides inside the oil production tree cap (30).

3. The device for pressure bore testing and bore enlargement of wellhead equipment and wellhead trees according to claim 1, characterized in that: The outer side of the light rod (2) away from the extraction head (25) is movably equipped with a third nut (18), and the outer side of the light rod (2) is movably provided with an upper flange (16), and the adjusting screw (11) is rotatably provided on the inner side of the upper flange (16).

4. The apparatus for pressure bore testing and bore enlargement of wellhead equipment and wellhead trees according to claim 3, characterized in that: Two sets of tie rods (12) are spliced ​​between the upper flange (16) and the lower flange (6), and a first nut (5) is movably provided on the outer side of the end of the tie rod (12). The first nut (5) is located on the side of the upper flange (16) and the lower flange (6) away from the adjusting plate (8).

5. The apparatus for pressure bore testing and bore enlargement of wellhead equipment and wellhead trees according to claim 3, characterized in that: A rod seal (15) is spliced ​​on the inner side of the upper flange (16), and a bare rod (2) is interactively disposed on the inner side of the rod seal (15). A rod sealing gasket (14) is spliced ​​on the inner side of the upper flange (16), and the bare rod (2) is slidably disposed on the inner side of the rod sealing gasket (14). The rod sealing gasket (14) is located on the side of the rod seal (15) close to the lower flange (6). A packing gland (13) is assembled on the side of the rod sealing gasket (14) away from the rod seal (15), and the packing gland (13) is fixedly disposed on the inner side of one end of the upper flange (16).

6. The apparatus for pressure bore testing and bore enlargement of wellhead equipment and wellhead trees according to claim 3, characterized in that: A hydraulic balance pipe (17) is fixedly installed on the inner side of the upper flange (16) away from the lower flange (6) by a thread, and a lifting joint (19) is fixedly installed on the outer side of the hydraulic balance pipe (17) away from the upper flange (16) by a thread.

7. The apparatus for pressure bore testing and bore enlargement of wellhead equipment and wellhead trees according to claim 6, characterized in that: A plug (20) is embedded on one side of the lifting joint (19), and a connecting ring (21) is threaded on the end of the lifting joint (19) away from the hydraulic balance pipe (17).

8. The apparatus for pressure bore testing and bore enlargement of wellhead equipment and wellhead trees according to claim 3, characterized in that: A first shut-off valve (3) is sealed on one side of the lower flange (6) and the upper flange (16), and a first pressure gauge (4) is fixedly installed on the end of the first shut-off valve (3) away from the light rod (2).

9. The apparatus for pressure bore testing and bore enlargement of wellhead equipment and wellhead trees according to claim 3, characterized in that: A ferrule (26) is sealed on the other side of the lower flange (6) and the upper flange (16), and a hydraulic control line (23) is embedded on the inner side of the end of the ferrule (26) away from the upper flange (16) and the lower flange (6).

10. The apparatus for pressure bore testing and bore enlargement of wellhead equipment and wellhead trees according to claim 9, characterized in that: The hydraulic control line (23) is equipped with a second shut-off valve (27) in the middle section, and a tee (28) is also equipped in the middle section of the hydraulic control line (23). The tee (28) is located on one side of the second shut-off valve (27), and a second pressure gauge (29) is installed on the side of the tee (28) near the polished rod (2).

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