Wellhead device with adjustable center

Abstract

The utility model discloses a center-adjustable wellhead device and relates to the technical field of oil production wellheads. The upper portion of the well mouth is connected with an adapter through an octagonal sealing gasket and a bolt, the upper portion of the adapter is connected with a packing cylinder through a bolt, the upper portion of the packing cylinder is in threaded connection with a pressing cap, the packing cylinder is filled with packing, and a gland is installed between the upper portion of the packing and the pressing cap. The device has the advantages that the long hole is formed in the flange plate of the packing cylinder, the position of the packing cylinder can be adjusted by loosening the bolt connected with the flange plate, the center of the packing cylinder is made to be consistent with the sucker rod, the size difference between the three planes and the sucker rod is measured through the depth gauge, the lead screw is rotated, and the lead screw pushes the packing cylinder to move, so that the packing cylinder is fixed. The packing barrel is arranged in the packing barrel until the distances between the three planes of the pressing cap and the sucker rod are consistent, at the moment, the packing barrel coincides with the center of the sucker rod, the sucker rod and the packing are evenly rubbed, the phenomenon of eccentric wear of the packing is avoided, and the service life of the packing is prolonged.

Description

Technical Field

[0001] This utility model relates to the field of oil wellhead technology, and in particular to a wellhead device with an adjustable center. Background Technology

[0002] Oil wellheads typically use packing to seal the sucker rod and prevent internal pressure from leaking. However, misalignment between the sucker rod and the wellhead during installation can cause uneven wear of the packing, leading to leaks. Therefore, there is an urgent need for an adjustable wellhead device that can align the sucker rod with the wellhead. Utility Model Content

[0003] To address the problem of leakage at oil wellheads, this invention provides an adjustable-center wellhead device.

[0004] The technical solution provided by this utility model is: an adjustable center wellhead device, including a wellhead, an adapter plate connected to the upper part of the wellhead by an octagonal sealing gasket and bolts, a packing cylinder connected to the upper part of the adapter plate by bolts, a pressure cap connected to the upper part of the packing cylinder by threads, packing packing filling inside the packing cylinder, and a pressure cap installed between the upper part of the packing packing and the pressure cap.

[0005] The pressure cap, pressure cover, packing sleeve, and adapter plate are all equipped with a central hole to accommodate the sucker rod, wherein the central hole of the adapter plate is the same size as the inner hole of the wellhead;

[0006] The lower part of the packing cylinder is equipped with a flange and a transfer plate connected by bolts. There are eight bolts connecting the flange and the transfer plate, which are evenly distributed around the circumference. The flange has an elongated hole to accommodate the bolts, and the length of the elongated hole is machined along the radial direction of the packing cylinder. The lower part of the packing cylinder is machined with a raised stop. The transfer plate is machined with a stepped hole. The end face of the stop of the packing cylinder and the stepped hole of the transfer plate are sealed by a sealing ring. The outer circle of the stop of the packing cylinder is smaller than that of the stepped hole of the transfer plate.

[0007] Three support plates are welded on the outer circle of the adapter plate. The support plates are evenly arranged along the circumference of the adapter plate. The support plates are threaded to the lead screw, which is arranged radially along the packing cylinder. Three planes are milled on the outer circle of the pressure cap. The three planes are evenly arranged along the circumference of the pressure cap and are perpendicular to the radial direction of the pressure cap.

[0008] The pressure cap consists of an upper pressure cap and a lower pressure cap, with a pressure sensor clamped between the upper and lower pressure caps.

[0009] The beneficial effects of this utility model are as follows: Because an elongated hole is provided on the flange of the packing cylinder, the position of the packing cylinder can be adjusted by loosening the bolts connecting the flange, so that the center of the packing cylinder is aligned with the sucker rod. Using a depth gauge, the dimensional differences between the three planes and the sucker rod are measured respectively. By rotating the lead screw, the lead screw pushes the packing cylinder to move until the three planes of the pressure cap are aligned with the sucker rod. At this time, the center of the packing cylinder coincides with the center of the sucker rod, and the sucker rod and the packing rub evenly, avoiding the phenomenon of uneven wear of the packing and improving the service life of the packing. Attached Figure Description

[0010] Appendix Figure 1 This is a schematic diagram of the structure of this utility model;

[0011] Appendix Figure 2 It is attached Figure 1 Top view.

[0012] In the diagram, 1-wellhead, 2-transfer plate, 201-stepped hole, 3-packing sleeve, 301-flange, 302-stop, 4-pressure cap, 5-sucking rod, 6-upper pressure cap, 7-packing packing, 8-elongated hole, 9-octagonal gasket, 10-sealing ring, 11-support plate, 12-lead screw, 13-plane, 14-pressure sensor, 15-lower pressure cap. Detailed Implementation

[0013] like Figures 1-2 As shown, an adjustable center wellhead device includes a wellhead 1, an adapter plate 2 connected to the upper part of the wellhead 1 by an octagonal sealing gasket 9 and bolts, a packing cylinder 3 connected to the upper part of the adapter plate 2 by bolts, a pressure cap 4 threadedly connected to the upper part of the packing cylinder 3, packing packing 7 filled inside the packing cylinder 3, and a pressure cap installed between the upper part of the packing packing 7 and the pressure cap 4.

[0014] The pressure cap 4, pressure cover, packing cylinder 3 and adapter plate 2 are all provided with a central hole to accommodate the sucker rod 5 passing through, wherein the central hole of the adapter plate 2 is the same size as the inner hole of the wellhead 1;

[0015] The lower part of the packing cylinder 3 is provided with a flange 301, which is bolted to the adapter plate 2. There are eight bolts connecting the flange 301 and the adapter plate 2, which are evenly distributed around the circumference. The flange 301 has an elongated hole 8 for accommodating the bolts. The length of the elongated hole 8 is machined along the radial direction of the packing cylinder 3. The lower part of the packing cylinder 3 is machined with a raised stop 302. The adapter plate 2 is machined with a stepped hole 201. The end faces of the stop 302 of the packing cylinder 3 and the stepped hole 201 of the adapter plate 2 are sealed by a sealing ring 10. The outer circle of the stop 302 of the packing cylinder 3 is smaller than that of the stepped hole 201 of the adapter plate 2. The above structure allows the position between the packing cylinder 3 and the adapter plate 2 to be adjusted without affecting the sealing performance. When it is necessary to adjust the center position of the packing cylinder 3, since the flange 301 of the packing cylinder 3 is provided with an elongated hole 8, the bolts connected to the flange 301 can be loosened to adjust the position of the packing cylinder 3 so that the center of the packing cylinder 3 is aligned with the sucker rod 5.

[0016] Three support plates 11 are welded to the outer circle of the adapter plate 2. The support plates 11 are evenly arranged around the circumference of the adapter plate 2. The support plates 11 are threaded to the lead screw 12, which is arranged radially along the packing cylinder 3. Three planes 13 are milled on the outer circle of the pressure cap 4. The three planes 13 are evenly arranged around the circumference of the pressure cap 4 and are perpendicular to the radial direction of the pressure cap 4. Using a depth gauge, the dimensional difference between the three planes 13 and the sucker rod 5 is measured. By rotating the lead screw 12, the lead screw 12 pushes the packing cylinder 3 to move until the distance between the three planes 13 of the pressure cap 4 and the sucker rod 5 is consistent. At this time, the center of the packing cylinder 3 and the sucker rod 5 coincides. The sucker rod 5 rubs evenly with the packing 7, avoiding the phenomenon of uneven wear of the packing 7 and improving the service life of the packing 7.

[0017] The gland is divided into an upper gland 6 and a lower gland 15. A pressure sensor 14 is clamped between the upper gland 6 and the lower gland 15. When the pressure sensor 14 senses that the pressure has dropped to a certain value, that is, the pressure between the packing 7 and the sucker rod 5 has also dropped, that is, the sealing performance of the packing 7 has deteriorated. At this time, the pressure sensor 14 can send a signal to notify the operator to tighten the gland 4.

Claims

1. An adjustable center wellhead assembly comprising a wellhead (1), characterized in that: The upper part of the wellhead (1) is connected with the adapter disc (2) through the octagonal sealing gasket (9) and the bolts, the upper part of the adapter disc (2) is connected with the packing cylinder (3) through the bolts, the upper part of the packing cylinder (3) is connected with the pressure cap (4) through the threads, the packing cylinder (3) is filled with the packing (7), and the packing cylinder (3) is provided with the gland between the upper part of the packing (7) and the pressure cap (4); The pressure cap (4), the gland, the packing cylinder (3) and the adapter disc (2) are all provided with the central hole for accommodating the sucker rod (5) to pass through, and the central hole of the adapter disc (2) is consistent with the inner hole size of the wellhead (1); The lower part of the packing cylinder (3) is provided with the flange (301) to be connected with the adapter disc (2) through the bolts, the number of the bolts connected with the adapter disc (2) is eight and is uniformly distributed in the circumference, the hole for accommodating the bolts to pass through is the long hole (8) in the flange (301), the length direction of the long hole (8) is processed along the radial direction of the packing cylinder (3), the lower part of the packing cylinder (3) is processed with the convex stop (302), the adapter disc (2) is processed with the stepped hole (201), the end faces between the stop (302) of the packing cylinder (3) and the stepped hole (201) of the adapter disc (2) are sealed through the sealing ring (10), and the outer circle of the stop (302) of the packing cylinder (3) is smaller than the stepped hole (201) of the adapter disc (2).

2. An adjustable center wellhead apparatus as defined in claim 1, wherein: Three supporting plates (11) are welded on the outer circle of the adapter disc (2), the supporting plates (11) are uniformly arranged along the circumference of the adapter disc (2), the supporting plates (11) are connected with the lead screws (12) through the threads, the lead screws (12) are arranged along the radial direction of the packing cylinder (3), three planes (13) are milled on the outer circle of the pressure cap (4), the three planes (13) are uniformly arranged along the circumference of the pressure cap (4), and the planes (13) are perpendicular to the radial direction of the pressure cap (4).

3. An adjustable center wellhead apparatus as defined in claim 1, wherein: The gland is divided into the upper gland (6) and the lower gland (15), and the pressure sensor (14) is clamped between the upper gland (6) and the lower gland (15).

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