Oil production wellhead hanger

Abstract

The utility model relates to the technical field of well mouth hangers, and discloses an oil production well mouth hanger which comprises a hanger body, an oil pipe column is inserted in the hanger body, an internal sealing ring is arranged in the hanger body, four sealing ring limiting blocks are evenly arranged at the top end of the internal sealing ring, and the sealing ring limiting blocks are arranged in the hanger body. A sealing ring pressure dividing assembly is arranged on the side edge of the hanger body, a pressure relief hole in the sealing ring pressure dividing assembly is formed in the hanger body and located on the bottom side of an internal sealing ring, and the sealing ring pressure dividing assembly is arranged on the side edge of the hanger body. The resilience force generated after the buffer spring deforms can buffer the impact force of the high-pressure gas, so that the impact force directly borne by the internal sealing ring from the high-pressure gas is reduced, the pressure borne by the internal sealing ring is reduced, the internal sealing ring is effectively prevented from being easily deformed or damaged due to too high pressure, and the sealing service life of the internal sealing ring is prolonged.

Description

Technical Field

[0001] This utility model relates to the field of wellhead hanger technology, specifically an oil wellhead hanger. Background Technology

[0002] The tubing head is an important component of the wellhead equipment for oil, gas, and water wells in oilfield production sites, located at the lowest point of the entire production tree. The casing head refers to the section below the main valve to the casing four-way flange, including the casing four-way and the hanger, and its function is to suspend the tubing and seal the annular space between the casing and the tubing.

[0003] A search revealed that this utility model, authorized by Chinese Patent Publication No. CN 222596033 U, relates to an oil wellhead hanger, belonging to the field of wellhead device technology. The oil wellhead hanger of this utility model includes a flange for connection to the flange on the casing four-way body and a suspension short section threaded into the central channel of the flange. The lower end of the suspension short section is provided with a pipe string connection end for connection to the tubing string, and an internal flow channel is provided penetrating the upper and lower ends of the suspension short section. This utility model's oil wellhead hanger can avoid the production shutdown caused by mechanical puncture damage to the "O" ring of conventional hollow conical built-in hangers or aging damage due to prolonged immersion in high temperature, high pressure, high acid, and / or high salt fluids.

[0004] The wellhead hanger in the above-mentioned patent still has some shortcomings. The sealing structure used in the existing oil wellhead hangers is mostly a sealing ring or sealing ring installed in it. However, during long-term use, the sealing ring is not only subject to the scouring of high-pressure fluid, but also easily deformed and damaged when subjected to high-pressure impact, which greatly reduces its sealing service life. Utility Model Content

[0005] To address the shortcomings of existing technologies, this utility model provides an oil wellhead hanger that solves the problem that the sealing structure used in existing oil wellhead hangers mostly relies on sealing rings or sealing rings to perform the sealing function. However, during long-term use, the sealing rings are not only subject to erosion by high-pressure fluids, but also easily deformed and damaged under high-pressure impacts, greatly reducing their service life.

[0006] This utility model provides the following technical solution: an oil wellhead hanger, including a hanger body, an oil tubing string inserted into the hanger body, an internal sealing ring provided in the hanger body, four sealing ring limiting blocks evenly provided at the top of the internal sealing ring, the sealing ring limiting blocks being fixedly connected to the inner wall of the hanger body, the internal sealing ring being sleeved on the end of the oil tubing string, and a sealing ring pressure dividing assembly provided on the side of the hanger body;

[0007] The pressure-reducing sealing ring assembly includes a pressure relief hole on the side of the suspension body. A pressure relief connecting pipe is connected to the outside of the pressure relief hole. A pressure relief buffer chamber is provided on the side of the pressure relief connecting pipe. The pressure relief buffer chamber and the pressure relief connecting pipe are connected by an air inlet connecting pipe. A piston head is slidably disposed in the pressure relief buffer chamber. A piston rod is vertically disposed at the end of the piston head. The end of the piston rod passes through the end of the pressure relief buffer chamber. A buffer spring is sleeved on the rod body at the end of the piston rod. One end of the buffer spring is connected to the piston rod body, and the other end of the buffer spring is connected to the outer wall of the pressure relief buffer chamber.

[0008] Preferred technical solution 1: A return hole is provided on the bottom side of the end of the pressure relief buffer chamber, and the bottom end of the return hole is connected to a return pipe, and the bottom end of the return pipe is connected to the suspension body.

[0009] Preferred technical solution 2: The bottom of the suspension body is provided with a bottom connecting flange, and the bottom connecting flange is connected to the bottom of the suspension body by a plurality of first connecting bolts inserted through it. Two first connecting nuts are symmetrically fitted at both ends of the first connecting bolts. The top of the suspension body is provided with a top connecting flange, and the top of the suspension body is connected to the top connecting flange by a plurality of second connecting bolts inserted through it. Two second connecting nuts are symmetrically fitted at both ends of the second connecting bolts.

[0010] Preferred technical solution 3: The pressure relief hole is located on the bottom side of the internal sealing ring.

[0011] This design allows the air pressure entering the suspension body to be drained through the pressure relief hole into the pressure relief buffer chamber before reaching the internal sealing ring, thus reducing the impact of high air pressure on the internal sealing ring.

[0012] Preferred technical solution four: A sealing ring is fitted at the junction of the piston rod and the pressure relief buffer chamber.

[0013] This solution enables a more airtight seal within the pressure relief buffer chamber.

[0014] Preferred technical solution five: The reflux hole is located on the side of the piston head.

[0015] This design ensures that when the piston head is elastically resisted by the buffer spring within the pressure relief buffer chamber, the piston head will not close against the top of the return hole.

[0016] Compared with the prior art, this utility model provides an oil wellhead hanger with the following advantages:

[0017] (1) This utility model provides a pressure-reducing component for the sealing ring on the main body of the hanger. The pressure relief hole of the pressure-reducing component is located on the bottom side of the internal sealing ring on the main body of the hanger. This allows the high-pressure gas entering the main body of the hanger to enter the pressure relief hole before it comes into contact with the internal sealing ring. The gas is then introduced into the pressure relief buffer chamber through the pressure relief connecting pipe, which pushes the piston head set in the pressure relief buffer chamber. The end of the piston head is provided with a buffer spring. The rebound force generated after the buffer spring deforms can buffer the impact force of the high-pressure gas, reduce the impact force of the high-pressure gas directly on the internal sealing ring, reduce the pressure on the internal sealing ring, effectively prevent the internal sealing ring from being easily deformed or damaged due to excessive pressure, and improve the sealing service life of the internal sealing ring. Attached Figure Description

[0018] Figure 1 This is a three-dimensional structural schematic diagram of the present invention;

[0019] Figure 2 This is a partial cross-sectional view of the structure of this utility model;

[0020] Figure 3 For the present utility model Figure 2 Enlarged view of the internal sealing ring structure;

[0021] Figure 4 For the present utility model Figure 2 Enlarged view of the structure of the central reflux orifice.

[0022] In the diagram: 1. Suspension body; 2. Oil pipe string; 3. Internal sealing ring; 4. Sealing ring limiting block; 5. Sealing ring pressure dividing assembly; 6. Bottom connecting flange; 7. First connecting bolt; 8. First connecting nut; 9. Top connecting flange; 10. Second connecting bolt; 11. Second connecting nut;

[0023] 501. Pressure relief hole; 502. Pressure relief connecting pipe; 503. Pressure relief buffer chamber; 504. Air inlet connecting pipe; 505. Piston head; 506. Piston rod; 507. Buffer spring; 508. Return hole; 509. Return pipe. Detailed Implementation

[0024] Please see Figure 1-4 ,

[0025] Example 1: An oil wellhead hanger includes a hanger body 1, a tubing string 2 inserted inside the hanger body 1, an internal sealing ring 3 inside the hanger body 1, four sealing ring limiting blocks 4 evenly arranged at the top of the internal sealing ring 3, the sealing ring limiting blocks 4 being fixedly connected to the inner wall of the hanger body 1, the internal sealing ring 3 being sleeved on the end of the tubing string 2, a sealing ring pressure dividing assembly 5 arranged on the side of the hanger body 1, and a bottom connecting flange 6 arranged at the bottom of the hanger body 1.

[0026] The bottom connecting flange 6 is connected to the bottom of the hanger body 1 by a number of first connecting bolts 7 inserted through it. Two first connecting nuts 8 are symmetrically fitted at both ends of the first connecting bolts 7. The top of the hanger body 1 is provided with a top connecting flange 9. The top of the hanger body 1 is connected to the top connecting flange 9 by a number of second connecting bolts 10 inserted through it. Two second connecting nuts 11 are symmetrically fitted at both ends of the second connecting bolts 10.

[0027] The sealing ring pressure distribution assembly 5 includes a pressure relief hole 501 opened on the side of the suspension body 1. A pressure relief connecting pipe 502 is connected to the outside of the pressure relief hole 501. A pressure relief buffer chamber 503 is provided on the side of the pressure relief connecting pipe 502. The pressure relief buffer chamber 503 and the pressure relief connecting pipe 502 are connected by an air inlet connecting pipe 504. A piston head 505 is slidably arranged in the pressure relief buffer chamber 503. A piston rod 506 is vertically arranged at the end of the piston head 505. The end of the piston rod 506 passes through the end of the pressure relief buffer chamber 503. A buffer spring 507 is sleeved on the rod body at the end of the piston rod 506.

[0028] One end of the buffer spring 507 is connected to the piston rod 506, and the other end of the buffer spring 507 is connected to the outer wall of the pressure relief buffer chamber 503. A return hole 508 is provided on the bottom side of the end of the pressure relief buffer chamber 503. The bottom end of the return hole 508 is connected to a return pipe 509. The bottom end of the return pipe 509 is connected to the suspension body 1.

[0029] Example 2: The difference between this example and Example 1 is that the pressure relief hole 501 is located on the bottom side of the internal sealing ring 3.

[0030] This allows the air pressure entering the suspension body 1 to be drained through the pressure relief hole 501 into the pressure relief buffer chamber 503 before reaching the internal sealing ring 3, thereby reducing the impact of high air pressure on the internal sealing ring 3.

[0031] Example 3: The difference between this example and Example 1 is that a sealing ring is fitted at the junction of the piston rod 506 and the pressure relief buffer chamber 503.

[0032] This makes the internal space of the pressure relief buffer chamber 503 more sealed.

[0033] Example 4: The difference between this example and Example 1 is that the reflux hole 508 is located on the side of the piston head 505.

[0034] This ensures that when the piston head 505 is elastically resisted by the buffer spring 507 inside the pressure relief buffer chamber 503, the piston head 505 will not close to the top of the return hole 508.

[0035] In this embodiment, since the sealing structure used in existing oil wellhead hangers is mostly a sealing ring or sealing ring installed therein, the sealing ring is not only subject to scouring by high pressure fluid during long-term use, but also easily deformed and damaged when subjected to high pressure impact, which greatly reduces its sealing service life.

[0036] In summary, during implementation, when high-pressure gas enters the interior of the well connected to the hanger body 1, a pressure-reducing assembly 5 with a sealing ring is installed on the hanger body 1. The pressure relief hole 501 in the pressure-reducing assembly 5 is located on the side wall of the hanger body 1, at the bottom of the internal sealing ring 3. This allows the high-pressure gas to enter the pressure relief connecting pipe 502 through the pressure relief hole 501, and then be guided to the pressure relief buffer chamber 503 through the air inlet connecting pipe 504. A piston head 505 is slidably installed in the pressure relief buffer chamber 503. A piston rod 506 is connected to the end of the piston head 505, and a buffer spring 507 is sleeved on the piston rod 506. When the high-pressure gas entering the pressure relief buffer chamber 503 impacts and pushes the piston head 505, the reaction force generated by the pull of the buffer spring 507 will buffer the gas pressure impact to a certain extent.

[0037] This achieves the buffering effect of high-pressure airflow, effectively preventing the low-pressure gas in the well from directly entering the hanger body 1 and causing excessive pressure on the internal sealing ring 3, thus effectively protecting the internal sealing ring 3 and increasing the sealing service life of the internal sealing ring 3 in the hanger body 1. The liquid entering the pressure relief buffer chamber 503 can be pushed by the buffer spring 507 to the piston head 505, and then returned to the hanger body 1 through the return pipe 509, making it more convenient to use.

Claims

1. An oil wellhead hanger, comprising a hanger body (1), characterized in that: The suspension body (1) is equipped with an oil pipe column (2), and an internal sealing ring (3) is provided inside the suspension body (1). Four sealing ring limiting blocks (4) are evenly provided at the top of the internal sealing ring (3). The sealing ring limiting blocks (4) are all fixedly connected to the inner wall of the suspension body (1). The internal sealing ring (3) is sleeved on the end of the oil pipe column (2). A sealing ring pressure dividing assembly (5) is provided on the side of the suspension body (1). The sealing ring pressure-dividing assembly (5) includes a pressure relief hole (501) opened on the side of the suspension body (1). A pressure relief connecting pipe (502) is connected to the outside of the pressure relief hole (501). A pressure relief buffer chamber (503) is provided on the side of the pressure relief connecting pipe (502). The pressure relief buffer chamber (503) and the pressure relief connecting pipe (502) are connected by an air inlet connecting pipe (504). A sliding part is provided inside the pressure relief buffer chamber (503). A piston head (505) is provided, and a piston rod (506) is vertically arranged at the end of the piston head (505). The end of the piston rod (506) passes through the end of the pressure relief buffer chamber (503). A buffer spring (507) is sleeved on the rod body at the end of the piston rod (506). One end of the buffer spring (507) is connected to the rod body of the piston rod (506), and the other end of the buffer spring (507) is connected to the outer wall of the pressure relief buffer chamber (503).

2. The wellhead hanger according to claim 1, characterized in that: A return hole (508) is provided on the bottom side of the end of the pressure relief buffer chamber (503). The bottom end of the return hole (508) is connected to a return pipe (509). The bottom end of the return pipe (509) is connected to the suspension body (1).

3. The wellhead hanger according to claim 2, characterized in that: The bottom of the suspension body (1) is provided with a bottom connecting flange (6), and the bottom connecting flange (6) is connected to the bottom of the suspension body (1) by a plurality of first connecting bolts (7) inserted through it. Two first connecting nuts (8) are symmetrically fitted at both ends of the first connecting bolts (7). The top of the suspension body (1) is provided with a top connecting flange (9), and the top of the suspension body (1) is connected to the top connecting flange (9) by a plurality of second connecting bolts (10) inserted through it. Two second connecting nuts (11) are symmetrically fitted at both ends of the second connecting bolts (10).

4. The wellhead hanger according to claim 3, characterized in that: The pressure relief hole (501) is located on the bottom side of the internal sealing ring (3).

5. The wellhead hanger according to claim 4, characterized in that: A sealing ring is fitted at the junction of the piston rod (506) and the pressure relief buffer chamber (503).

6. The wellhead hanger according to claim 5, characterized in that: The reflux hole (508) is located on the side of the piston head (505).

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