High-temperature metal sealing tubing head

Abstract

The utility model belongs to the technical field of tubing heads, and particularly relates to a high-temperature metal sealing tubing head which comprises a tubing head body and a tubing hanger, the tubing hanger is installed inside the upper end of the tubing head body, and a crossover flange is installed at the upper end of the tubing hanger. A first sealing backing ring is arranged between the crossover flange and the tubing hanger, the lower end of the tubing head body is connected with a casing head through a bolt, and a second sealing backing ring and a connecting backing ring are arranged between the tubing head body and the casing head. According to the high-temperature metal sealing tubing head, by rotating the jackscrew rod, the supporting ring and the metal sealing ring are extruded, the metal sealing ring is expanded, the supporting ring and the metal sealing ring form a sealing state, the sealing performance of the high-temperature metal sealing tubing head is enhanced, liquid pressure is applied through the pressure through hole, the inner conical groove is expanded, and the sealing performance of the high-temperature metal sealing tubing head is improved. And the sealing performance of the high-temperature metal sealing tubing head can also be enhanced.

Description

Technical Field

[0001] The utility model relates to the technical field of oil pipe heads, in particular to a high-temperature metal sealed oil pipe head. Background Art

[0002] Oilfield drilling operations are usually carried out in high-temperature and high-pressure underground environments. Especially in deep well drilling, the underground temperature will be very high. The use of high-temperature metal sealed tubing heads can work in such extreme environments and maintain structural stability and sealing performance. In the oilfield drilling process, high-temperature metal sealed tubing heads are used to connect drilling equipment such as drill pipes, pipe strings, and drill bits to ensure that drilling fluids, oil and gas and other media will not leak to the surface or underground during the drilling process, thereby ensuring the safety of the operation and environmental protection;

[0003] According to publication number CN204691696U, a high-temperature metal sealed tubing head comprises a conversion flange (1), a tubing hanger (5), a tubing head (6) and a casing head (9); the inner side of the upper end of the tubing hanger (5) is sealed with the conversion flange (1) via a sealing gasket ring 1 (2); the outer side of the upper end of the tubing hanger (5) is sealed with the conversion flange (I) via a packing assembly (3); the outer side of the lower end of the tubing hanger (5) and the inner wall of the upper end of the tubing head (6) are sealed with a conical surface fit; the inner side of the lower end of the tubing head (6) and the inner side of the casing head (9) are sealed with a sealing gasket ring 2 (7); the sealing gasket ring 1 (2) and the sealing gasket ring 2 (7) are both made of metal materials: the utility model has a wide applicable temperature range, meets the new process requirements under high temperature, avoids the leakage phenomenon of the sealing part of the traditional tubing head under high temperature or low temperature environment, and has higher sealing reliability and longer service life;

[0004] The above patent mentioned that the packing component of the high-temperature metal-sealed oil pipe head in the patent uses raw graphite packing. Under high temperature, high pressure and frequent operation environment, the raw graphite packing is prone to wear and fatigue after long-term use. The packing is prone to rapid wear, resulting in leakage or failure. In addition, the raw graphite packing is prone to friction and wear when in contact with the metal-sealed oil pipe head. Especially under high temperature conditions, the packing may bond and rub against the metal surface, resulting in a decrease in sealing performance. Therefore, we proposed a high-temperature metal-sealed oil pipe head. Utility Model Content

[0005] The purpose of the utility model is to provide a high-temperature metal sealed oil pipe head to solve the problem that the original graphite packing is prone to wear and fatigue after long-term use, and the original graphite packing is prone to friction and wear when in contact with the metal sealed oil pipe head, resulting in a decrease in sealing performance.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a high-temperature metal-sealed tubing head, comprising a tubing head main body and a tubing hanger, the tubing hanger is installed inside the upper end of the tubing head main body, and a conversion flange is installed on the upper end of the tubing hanger, a first sealing gasket is arranged between the conversion flange and the tubing hanger, the lower end of the tubing head main body is connected to the casing head by bolts, a second sealing gasket and a connecting gasket are arranged between the tubing head main body and the casing head, a top screw is installed inside the conversion flange, a metal sealing mechanism is arranged in the gap between the tubing hanger and the conversion flange near the top screw, and the metal sealing mechanism comprises a support ring, a pressure through hole and a metal sealing ring, and the support ring is slidably docked with the gap between the tubing hanger and the conversion flange.

[0007] Preferably, a pressure through hole is provided inside the support ring, and a metal sealing ring is butted against a side of the support ring away from the top screw.

[0008] Preferably, a top screw loading surface is fixed to a side of the support ring close to the top screw rod, and a matching conical surface is fixed to a side of the support ring close to the metal sealing ring.

[0009] Preferably, an inner conical groove and a U-shaped groove are sequentially formed inside the metal sealing ring, and hemispherical sealing surfaces are respectively fixed on the inner and outer sides of the metal sealing ring.

[0010] Compared with the prior art, the beneficial effect of the utility model is that the high-temperature metal sealed oil pipe head, by rotating the top screw, squeezes the support ring and the metal sealing ring, expands the metal sealing ring, and makes the support ring and the metal sealing ring form a sealed state, thereby enhancing the sealing performance of the high-temperature metal sealed oil pipe head, and applies liquid pressure through the pressure through hole to expand the inner conical groove, which can also enhance the sealing performance of the high-temperature metal sealed oil pipe head. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 This is a schematic diagram of the front cross-sectional structure of the utility model;

[0012] Figure 2 For this utility model Figure 1 A schematic diagram of the partially enlarged structure at center A;

[0013] Figure 3 It is a schematic diagram of the front cross-sectional structure of the support ring and the metal sealing ring of the utility model.

[0014] In the figure: 1. tubing head body; 101. tubing hanger; 102. conversion flange; 103. first sealing gasket; 104. second sealing gasket; 105. connecting gasket; 106. casing head; 2. top screw; 3. metal sealing mechanism; 301. support ring; 302. pressure through hole; 303. metal sealing ring; 3011. top screw loading surface; 3012. matching cone surface; 3031. inner cone groove; 3032. U-shaped groove; 3033. hemispherical sealing surface. DETAILED DESCRIPTION

[0015] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0016] See also Figure 1-Figure 3 The utility model provides a technical solution: a high-temperature metal sealed tubing head, comprising a tubing head body 1 and a tubing hanger 101, the tubing hanger 101 is installed inside the upper end of the tubing head body 1, and a conversion flange 102 is installed on the upper end of the tubing hanger 101, a first sealing gasket 103 is arranged between the conversion flange 102 and the tubing hanger 101, the lower end of the tubing head body 1 is connected to a casing head 106 by bolts, a second sealing gasket 104 and a connecting gasket 105 are arranged between the tubing head body 1 and the casing head 106, a top screw 2 is installed inside the conversion flange 102, a metal sealing mechanism 3 is arranged in the gap between the tubing hanger 101 and the conversion flange 102 near the top screw 2, and the metal sealing mechanism 3 includes a support ring 301 , a pressure through hole 302 and a metal sealing ring 303, the support ring 301 is slidably connected with the gap between the tubing hanger 101 and the conversion flange 102, a pressure through hole 302 is opened inside the support ring 301, and the side of the support ring 301 away from the top screw 2 is connected with the metal sealing ring 303, a top screw loading surface 3011 is fixed on the side of the support ring 301 close to the top screw 2, and a matching conical surface 3012 is fixed on the side of the support ring 301 close to the metal sealing ring 303, an inner conical groove 3031 and a U-shaped groove 3032 are opened in sequence inside the metal sealing ring 303, and hemispherical sealing surfaces 3033 are fixed on the inner and outer sides of the metal sealing ring 303 respectively, the conversion flange 102 is threadedly connected to the top screw 2, and the matching conical surface 3012 and the inner conical groove 3031 are interference fit.

[0017] In specific implementation, according to Figure 1-Figure 3When drilling operations are required, the top screw 2 is rotated. One end of the top screw 2 is pressed against the top screw loading surface 3011 of the support ring 301, so that the support ring 301 slides on the outside of the tubing hanger 101, and the matching conical surface 3012 of the support ring 301 is docked with the inner conical groove 3031 of the metal sealing ring 303. The matching conical surface 3012 and the inner conical groove 3031 are interference fit, so that the inner conical groove 3031 of the metal sealing ring 303 is expanded outward, so that the metal sealing ring 303 is pressed against the outside of the tubing hanger 101 and the inside of the tubing head body 1, so that the metal sealing ring 303 pushes the hemispherical sealing surface 3033 to squeeze against the inside of the tubing head body 1. Pressure sealing can enhance the sealing performance of the high-temperature metal sealed oil pipe head, and the staff can also apply liquid pressure through the pressure through hole 302 to expand the inner cone groove 3031, which can also enhance the sealing performance of the high-temperature metal sealed oil pipe head. The support ring 301 and the metal sealing ring 303 are made of high-temperature resistant metal materials, which can maintain strength and corrosion resistance at high temperatures, and can effectively prevent the oil pipe head from leaking under high temperature and high pressure environments. The metal seals are more wear-resistant and corrosion-resistant, and can maintain stable sealing performance under high temperature and high pressure for a long time, reduce maintenance and replacement frequency, reduce operating costs, and extend the service life of the high-temperature metal sealed oil pipe head.

[0018] In summary, by rotating the top screw 2, the support ring 301 and the metal sealing ring 303 form a sealing state, thereby enhancing the sealing performance of the high-temperature metal sealed oil pipe head, and applying liquid pressure through the pressure through hole 302 to expand the inner conical groove 3031, which can also enhance the sealing performance of the high-temperature metal sealed oil pipe head, thereby extending the service life of the high-temperature metal sealed oil pipe head. The contents not described in detail in this specification belong to the existing technology known to professional and technical personnel in this field.

[0019] Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art may still modify the technical solutions described in the aforementioned embodiments, or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. A high-temperature metal sealed tubing head, comprising a tubing head body (1) and a tubing hanger (101), characterized in that: A tubing hanger (101) is installed inside the upper end of the tubing head body (1), and a conversion flange (102) is installed on the upper end of the tubing hanger (101). A first sealing gasket (103) is arranged between the conversion flange (102) and the tubing hanger (101). The lower end of the tubing head body (1) is connected to a casing head (106) by bolts. A second sealing gasket (104) and a second sealing gasket (105) are arranged between the tubing head body (1) and the casing head (106). A connecting gasket (105) is provided, a top screw (2) is installed inside the conversion flange (102), a metal sealing mechanism (3) is provided in the gap between the tubing hanger (101) and the conversion flange (102) near the top screw (2), and the metal sealing mechanism (3) includes a support ring (301), a pressure through hole (302) and a metal sealing ring (303), and the support ring (301) is slidably connected to the gap between the tubing hanger (101) and the conversion flange (102).

2. A high temperature metal sealed oil pipe head according to claim 1, characterized in that: A pressure through hole (302) is provided inside the support ring (301), and a metal sealing ring (303) is butted against a side of the support ring (301) away from the top screw (2).

3. A high temperature metal sealed oil pipe head according to claim 2, characterized in that: A top screw loading surface (3011) is fixed on one side of the support ring (301) close to the top screw rod (2), and a matching conical surface (3012) is fixed on one side of the support ring (301) close to the metal sealing ring (303).

4. A high temperature metal sealed oil pipe head according to claim 3, characterized in that: The metal sealing ring (303) is provided with an inner conical groove (3031) and a U-shaped groove (3032) in sequence inside, and hemispherical sealing surfaces (3033) are respectively fixed on the inner and outer sides of the metal sealing ring (303).

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