Anti-corrosion high-strength oil extraction wellhead device

Abstract

The utility model relates to the technical field of oil extraction well mouths, in particular to an anti-corrosion high-strength oil extraction well mouth device. A first flange is fixed to the side surface of a Christmas tree body, a tubing head body is arranged at the end of the first flange, a second flange is fixed to the end of the tubing head body, the outer surface of a screw is sleeved with a nut, a containing groove is formed in the surface of the screw, a guide rod is arranged on the inner wall of the containing groove, and a rubber block is fixed to the end of the guide rod. The device has the beneficial effects that the one-way valve is opened firstly, then lubricating oil is injected into the containing groove through the oil inlet hole, the one-way valve is closed after a certain amount of lubricating oil is injected, then the pressing plate is pressed to drive the guide rod to move, and the rubber block moves to continuously extrude the space, where the lubricating oil is located, of the containing groove, so that the pressure intensity is increased; when the pressure intensity is increased, the injected lubricating oil is ejected into the spiral groove in the connecting position of the screw rod and the nut through the through hole, and anti-corrosion treatment of the connecting position of the screw rod and the nut is achieved when the screw rod is locked.

Description

Technical Field

[0001] The utility model relates to the technical field of oil wellheads, in particular to an anti-corrosion high-strength oil wellhead device. Background Art

[0002] The oil and gas wellhead is an important component connecting the Christmas tree, oil pipeline and booster station, and is used to control and regulate the flow of oil, gas and water.

[0003] In the prior art, the oil wellhead device is generally a Christmas tree, which is the main equipment for controlling and regulating oil and gas production at the top of the oil and gas well. It is mainly composed of three parts: casing head, tubing head and Christmas tree body, and is used for control and regulation of oil production.

[0004] However, the existing Christmas tree connecting the tubing head and the casing head is mostly fixed by connecting flanges and screws. In order to prevent the screw from corroding and rusting, lubricating oil is generally applied to the surface of the screw regularly. When the screw is locked, the lubricating oil is not easy to apply to the connection between the screw and the nut, which easily causes corrosion and rust, affecting the disassembly and assembly of the Christmas tree. Utility Model Content

[0005] The utility model aims to provide a corrosion-resistant and high-strength oil production wellhead device to solve the problems raised in the above-mentioned background technology.

[0006] To achieve the above object, the utility model provides the following technical solution: an anti-corrosion high-strength oil production wellhead device, the anti-corrosion high-strength oil production wellhead device comprising:

[0007] A Christmas tree body, wherein a first flange is fixed to a side surface of the Christmas tree body, a tubing head body is disposed at an end of the first flange, and a second flange is fixed to an end of the tubing head body;

[0008] A screw rod, a nut is sleeved on the outer surface of the screw rod, a receiving groove is opened on the surface of the screw rod, a guide rod is arranged on the inner wall of the receiving groove, and a rubber block is fixed on the end of the guide rod.

[0009] Preferably, a fixing plate is fixed to the inner wall of the storage groove, a connecting hole is provided on the surface of the fixing plate, a limiting block is fixed to the inner wall of the storage groove, a through hole is provided on the inner wall of the storage groove, a notch is provided on the surface of one end of the inner wall of the storage groove, and an oil inlet hole is provided on the surface of the other end of the inner wall of the storage groove.

[0010] Preferably, a one-way valve is fixed to the inner wall of the oil inlet hole, a pressing plate is fixed to one end surface of the guide rod, a limiting groove is provided on the arc surface of the pressing plate, a rubber block is fixed to the other end surface of the guide rod, and a spring is sleeved on the outer surface of the guide rod.

[0011] Preferably, the fixing plate is fixed at the middle position of the inner wall of the storage groove, the limiting block is fixed to the inner wall surface of the storage groove on one side of the fixing plate, and the through hole is opened on the inner wall surface of the storage groove on the other side of the fixing plate.

[0012] Preferably, the notch is opened on the bottom surface of the inner wall of the receiving groove on the side of the limit block, the spring is sleeved on the outer surface of the guide rod between the fixed plate and the notch, the oil inlet hole is opened on the bottom surface of the inner wall of the receiving groove on the side of the through hole, and the diameter of the notch is larger than the diameter of the connecting hole.

[0013] Preferably, the limit blocks are provided in multiple groups, and the multiple groups of limit blocks are distributed in a circle on the inner wall surface of the storage groove. The limit grooves are provided in multiple groups, and the limit grooves are distributed in a circle on the outer surface of the pressing plate. The limit blocks correspond to the limit grooves, and the limit blocks are clamped in the limit grooves, and the two are movably connected.

[0014] Compared with the prior art, the beneficial effects of the utility model are:

[0015] First, the one-way valve is opened, and then the lubricating oil is injected into the storage groove through the oil inlet hole. When a certain amount of lubricating oil is injected, the one-way valve is closed, and then the pressing plate is pressed to drive the guide rod to move along its axis to contract the spring. The movement of the rubber block will continuously squeeze the storage groove space where the lubricating oil is located, thereby increasing its pressure. The increased pressure will push the injected lubricating oil into the spiral groove at the connection between the screw and the nut through the through hole, thereby achieving anti-corrosion treatment at the connection between the screw and the nut when the screw is locked. Finally, the pressing plate is released, and the spring reset will drive the rubber block to reset, so that the pressure in the storage groove near one end of the through hole is restored, which is convenient for the next injection of lubricating oil. This structure is simple, easy to operate, and is conducive to improving its use effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the main structure of the utility model;

[0017] Figure 2 This is a schematic diagram of the bolt structure of the utility model;

[0018] Figure 3 This is a schematic cross-sectional view of the screw structure of the utility model;

[0019] Figure 4 This is a schematic diagram of the guide rod structure of the utility model.

[0020] In the figure: 1. Christmas tree body; 2. First flange; 3. Second flange; 4. Tubing head body; 5. Screw; 6. Pressing plate; 7. Nut; 8. Notch; 9. Receiving groove; 10. Limit block; 11. Fixing plate; 12. Connecting hole; 13. Through hole; 14. Oil inlet hole; 15. One-way valve; 16. Limit groove; 17. Spring; 18. Guide rod; 19. Rubber block. DETAILED DESCRIPTION

[0021] In order to make the purpose and technical solution of the present invention clearly and completely described, and the advantages more clearly understood, the embodiments of the present invention are further described in detail with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are part of the embodiments of the present invention, rather than all of the embodiments, and are only used to explain the embodiments of the present invention, and are not used to limit the embodiments of the present invention. All other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0022] Example 1: Please refer to Figures 1 to 4 The utility model provides a technical solution: a corrosion-resistant and high-strength oil production wellhead device, a Christmas tree body 1, a first flange 2 is fixed to the side surface of the Christmas tree body 1, a tubing head body 4 is provided at the end of the first flange 2, a second flange 3 is fixed to the end of the tubing head body 4, and the first flange 2 and the second flange 3 are the medium for connecting and fixing the Christmas tree body 1 and the tubing head body 4.

[0023] A nut 7 is sleeved on the outer surface of the screw 5, a receiving groove 9 is opened on the surface of the screw 5, a guide rod 18 is provided on the inner wall of the receiving groove 9, and a rubber block 19 is fixed to the end of the guide rod 18. Due to the presence of the rubber block 19, the movement of the rubber block 19 will continuously squeeze the space of the receiving groove 9 where the lubricating oil is located, thereby increasing its pressure. The increased pressure will push the injected lubricating oil into the spiral groove at the connection between the screw 5 and the nut 7 through the through hole 13, thereby achieving anti-corrosion treatment of the connection between the screw 5 and the nut 7 when the screw 5 is locked.

[0024] On the basis of Example 1, in order to achieve anti-corrosion treatment of the connection between the screw 5 and the nut 7, a fixing plate 11 is fixed on the inner wall of the storage groove 9, a connecting hole 12 is opened on the surface of the fixing plate 11, a limiting block 10 is fixed on the inner wall of the storage groove 9, a through hole 13 is opened on the inner wall of the storage groove 9, a notch 8 is opened on the surface of one end of the inner wall of the storage groove 9, and an oil inlet hole 14 is opened on the surface of the other end of the inner wall of the storage groove 9.

[0025] A one-way valve 15 is fixed to the inner wall of the oil inlet hole 14, a pressing plate 6 is fixed to the surface of one end of the guide rod 18, a limiting groove 16 is provided on the arc surface of the pressing plate 6, a rubber block 19 is fixed to the surface of the other end of the guide rod 18, and a spring 17 is sleeved on the outer surface of the guide rod 18. Due to the elasticity of the spring 17, the reset of the spring 17 will drive the rubber block 19 to reset, so that the pressure in the receiving groove 9 near one end of the through hole 13 is restored, which is convenient for the next injection of lubricating oil.

[0026] The fixing plate 11 is fixed at the middle position of the inner wall of the receiving groove 9 , the limiting block 10 is fixed to the inner wall surface of the receiving groove 9 on one side of the fixing plate 11 , and the through hole 13 is opened on the inner wall surface of the receiving groove 9 on the other side of the fixing plate 11 .

[0027] The notch 8 is provided on the bottom surface of the inner wall of the receiving groove 9 on the side of the limit block 10, and the spring 17 is sleeved on the outer surface of the guide rod 18 between the fixed plate 11 and the notch 8. Due to the elasticity of the spring 17, the reset of the spring 17 will drive the rubber block 19 to reset, so that the pressure in the receiving groove 9 near one end of the through hole 13 is restored, which is convenient for the next injection of lubricating oil. The oil inlet hole 14 is provided on the bottom surface of the inner wall of the receiving groove 9 on one side of the through hole 13, and the diameter of the notch 8 is larger than the diameter of the connecting hole 12.

[0028] There are multiple groups of limit blocks 10, which are distributed in a circle on the inner wall surface of the storage groove 9. There are multiple groups of limit grooves 16, which are distributed in a circle on the outer surface of the pressing plate 6. The limit blocks 10 correspond to the limit grooves 16. The limit blocks 10 are clamped in the limit grooves 16, and the two are movably connected, which plays a positioning role in the movement of the guide rod 18 in the storage groove 9.

[0029] The specific scheme is as follows: when it is necessary to apply lubricating oil to the spiral groove at the connection between the screw rod 5 and the nut 7, the one-way valve 15 is first opened, and then the lubricating oil is injected into the receiving groove 9 through the oil inlet hole 14. When a certain amount of lubricating oil is injected, the one-way valve 15 is closed, and then the pressing plate 6 is pressed to drive the guide rod 18 to move along its axis to shrink the spring 17. Due to the presence of the rubber block 19, the movement of the rubber block 19 will continuously squeeze the space of the receiving groove 9 where the lubricating oil is located, thereby increasing its pressure. The increased pressure will push the injected lubricating oil into the spiral groove at the connection between the screw rod 5 and the nut 7 through the through hole 13, thereby achieving anti-corrosion treatment of the connection between the screw rod 5 and the nut 7 when the screw 5 is locked. Finally, the pressing plate 6 is released. Due to the elasticity of the spring 17, the reset of the spring 17 will drive the rubber block 19 to reset, so that the pressure in the receiving groove 9 near one end of the through hole 13 is restored, which is convenient for the next injection of lubricating oil. This structure is simple and easy to operate, which is conducive to improving its use effect.

[0030] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A corrosion-resistant high-strength oil production wellhead device, characterized by: The anti-corrosion high-strength oil production wellhead device comprises: A Christmas tree body (1), a first flange (2) being fixed on a side surface of the Christmas tree body (1), a tubing head body (4) being provided at the end of the first flange (2), and a second flange (3) being fixed at the end of the tubing head body (4); A screw rod (5), the outer surface of the screw rod (5) is sleeved with a nut (7), the surface of the screw rod (5) is provided with a receiving groove (9), the inner wall of the receiving groove (9) is provided with a guide rod (18), the end of the guide rod (18) is fixed with a rubber block (19), the inner wall of the receiving groove (9) is fixed with a fixing plate (11), the surface of the fixing plate (11) is provided with a connecting hole (12), the inner wall of the receiving groove (9) is fixed with a limiting block (10), the inner wall of the receiving groove (9) is provided with a through hole (13), the inner wall of the receiving groove (9) is provided with a notch (8) on one end surface, and the inner wall of the receiving groove (9) is provided with an inlet An oil hole (14), a one-way valve (15) is fixed on the inner wall of the oil inlet hole (14), a pressing plate (6) is fixed on one end surface of the guide rod (18), a limiting groove (16) is provided on the arc surface of the pressing plate (6), a rubber block (19) is fixed on the other end surface of the guide rod (18), a spring (17) is sleeved on the outer surface of the guide rod (18), the fixed plate (11) is fixed at the middle position of the inner wall of the receiving groove (9), the limiting block (10) is fixed on the inner wall surface of the receiving groove (9) on one side of the fixed plate (11), and the through hole (13) is provided on the inner wall surface of the receiving groove (9) on the other side of the fixed plate (11).

2. The corrosion-resistant and high-strength oil production wellhead device according to claim 1, characterized in that: The notch (8) is formed on the bottom surface of the inner wall of the receiving groove (9) on the side of the limit block (10); the spring (17) is sleeved on the outer surface of the guide rod (18) between the fixing plate (11) and the notch (8); the oil inlet hole (14) is formed on the bottom surface of the inner wall of the receiving groove (9) on the side of the through hole (13); and the diameter of the notch (8) is greater than the diameter of the connecting hole (12).

3. The corrosion-resistant and high-strength oil production wellhead device according to claim 2, characterized in that: The limit blocks (10) are provided in a plurality of groups, and the plurality of limit blocks (10) are distributed in a circular manner on the inner wall surface of the storage groove (9). The limit grooves (16) are provided in a plurality of groups, and the limit grooves (16) are distributed in a circular manner on the outer surface of the pressing plate (6). The limit blocks (10) correspond to the limit grooves (16), and the limit blocks (10) are clamped in the limit grooves (16), and the two are movably connected.

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