Hydraulic pumping unit and wellhead connection device

Abstract

A device for connecting a hydraulic pumping unit and a wellhead relates to the field of machinery. A hydraulic pumping unit main body is provided with a hydraulic pumping unit flange, which is fixed by bolts. A wellhead flange is installed at the wellhead. A support column is installed between the hydraulic pumping unit flange and the wellhead flange. One end of the support column is connected to the wellhead flange and is locked and fixed by the wellhead flange fastening nut and a gasket. The other end of the support column passes through the flange hole of the hydraulic pumping unit flange. Concave gaskets and convex gaskets are installed on the upper and lower surfaces of the connection. The sealing surface of the hydraulic pumping unit flange is locked and fixed by a locking nut and cooperates with a special sealing ring for sealing. The special sealing ring of the device not only plays a sealing role, but also plays a role as a rotating fulcrum. The support column adjusts the hydraulic pumping unit flange to rotate and fix it through the special sealing ring. When the concave gasket and the convex gasket are locked by the nut, they can not only adjust the height, but also increase the contact area to prevent loosening.

Description

Technical Field

[0001] The invention relates to the field of machinery, in particular to a hydraulic oil pumping unit and a wellhead connecting device. Background Art

[0002] At present, hydraulic pumping units are mainly used in oil production operations in my country's oil fields. Hydraulic pumping units have a compact structure, light weight, low cost, stable operation, easy to achieve long strokes, and convenient stroke and stroke frequency adjustment. They are easy to achieve safety protection and have obvious energy-saving effects. They are particularly suitable for oil production operations in mountainous areas, tidal flats, and offshore platforms. Therefore, engineering and technical personnel in various countries have long been committed to the research and development of hydraulic pumping units, which has enabled hydraulic pumping units to be promoted and applied on a larger scale and achieve better economic benefits. Most of the existing hydraulic pumping units and wellhead connection devices are fixed. Once there is a problem of misalignment, the radial force on the hydraulic pumping rod is damaged, and the hydraulic pumping unit needs to be repaired. The existing connection device cannot arbitrarily adjust the relative coaxial angle between the hydraulic pumping unit and the oil pipe, and manual adjustment cannot guarantee sealing and tightening. Therefore, a connection device is needed to solve this problem. Summary of the invention

[0003] The purpose of the present invention is to provide a hydraulic pumping unit and wellhead connection device, which is used to solve the problem that the hydraulic press cannot achieve arbitrary angle adjustment and fastening under the premise of ensuring sealing.

[0004] The technical solution of the present invention is as follows:

[0005] A hydraulic pumping unit and wellhead connection device, comprising a hydraulic pumping unit flange 1, a concave gasket 2, a convex gasket 3, a locking nut 4, a support column 5, a wellhead flange fastening nut 6, a gasket 7, a wellhead flange 8, a special sealing ring 9, a hydraulic pumping unit flange sealing surface 10, a hydraulic pumping rod 11, a pumping pipe 12, a small four-way oil pipe 13, a Christmas tree 14, and a hydraulic pumping unit body 15, wherein the hydraulic pumping unit body 15 is installed with a hydraulic pumping unit flange 1, fixed by bolts, a wellhead flange 8 is installed at the wellhead, a support column 5 is installed between the hydraulic pumping unit flange 1 and the wellhead flange 8, one end of the support column 5 is connected to the wellhead flange 8, and a screw thread is formed on the wellhead flange 8. The wellhead flange is locked and fixed with nuts 6 and gaskets 7, the other end of the support column 5 passes through the flange hole of the hydraulic pumping unit flange 1, concave gaskets 2 and convex gaskets 3 are installed on the upper and lower surfaces of the connection, and are locked and fixed by locking nuts 4, a Christmas tree 14 is installed below the hydraulic pumping unit flange 1, a small four-way oil pipe 13 is installed in the Christmas tree 14, a seal is set between the hydraulic pumping unit flange 1 and the small four-way oil pipe 13, the sealing surface of the hydraulic pumping unit flange 1 is the hydraulic pumping unit flange sealing surface 10, the special sealing ring 9 cooperates with the hydraulic pumping unit flange sealing surface 10 to seal, a hydraulic pumping rod 11 is installed in the hydraulic pumping unit body 15, and a pumping pipe 12 is arranged in the well.

[0006] The number of the support columns 5 is 3-8, preferably 4. 4 support columns are more stable than 3 support columns, are relatively more convenient, and save materials.

[0007] The concave gasket is a cone surface, and the convex gasket is an SR spherical surface. The concave gasket and the convex gasket are matched in size, and the gasket is a standard part, and the size is selected according to needs.

[0008] The flange sealing surface 10 of the hydraulic pumping unit is a conical surface.

[0009] The special sealing ring 9 is an SR spherical surface.

[0010] The special sealing ring 9 is a single-sided spherical surface or a double-sided spherical surface.

[0011] The concave-convex gasket spherical structure can be decomposed into the nut and the flange.

[0012] During operation, after the hydraulic pumping unit is connected, the parallelism between the hydraulic pumping unit flange 1 and the wellhead flange 8 is detected. When they are not parallel, a certain angle is generated. When the angle exceeds ±1°, the hydraulic pumping rod 11 contacts the pumping pipe 12, thereby generating radial force, and the support column 5, the wellhead flange fastening nut 6, the gasket 7, and the wellhead flange 8 are connected and fixed. At this time, the height position of the concave gasket 2, the convex gasket 3, and the locking nut 4 relative to the support column 5 is adjusted diagonally, so that the hydraulic pumping unit flange 1 rotates at the contact point between the special sealing ring 9 and the hydraulic pumping unit flange sealing surface 10 until the hydraulic pumping unit flange 1 is parallel to the wellhead flange 8, and the locking nut 4 is locked. At this time, the coaxiality of the hydraulic pumping rod 11 and the pumping pipe 12 can be accepted, which solves the radial force on the hydraulic pumping rod 11 and extends the maintenance-free period of the hydraulic pumping unit.

[0013] The beneficial technical effects of the present invention are as follows: the special sealing ring of the device not only plays a sealing role, but also plays a role as a rotating fulcrum; the support column adjusts the hydraulic pumping unit flange to rotate and fix it through the special sealing ring, wherein the contact area between the locking nut and the hydraulic pumping unit flange will become smaller after an angle is generated, thereby reducing the friction force and making it easy to loosen. In the designed device, the concave gasket and convex gasket are selected according to needs. Usually, the convex surface has a small inner hole and is close to one side of the nut, while the concave surface has a large inner hole and is close to one side of the flange. When the concave gasket and the convex gasket are locked by the nut, they can not only adjust the height, but also increase the contact area to prevent loosening. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the structure of the present invention.

[0015] Figure 2 for Figure 1 AA section view.

[0016] Figure 3 for Figure 1 Top view of the .

[0017] Figure 4 for Figure 3 Cross-sectional view of BB.

[0018] Figure 5 Schematic diagram of the sealing connection structure.

[0019] Figure 6 This is a schematic diagram of the sealing ring structure provided in Example 2.

[0020] Figure 7 This is a schematic diagram of the sealing ring structure provided in Example 3. DETAILED DESCRIPTION

[0021] The present application is described clearly and completely below in conjunction with the drawings in the specification. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative work are within the scope of protection of the present invention.

[0022] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0023] Example 1

[0024] Combined with Figure 1 , 2 , 3, 4, 5, a hydraulic pumping unit and wellhead connection device, including a hydraulic pumping unit flange 1, a concave gasket 2, a convex gasket 3, a locking nut 4, a support column 5, a wellhead flange fastening nut 6, a gasket 7, a wellhead flange 8, a special sealing ring 9, a hydraulic pumping unit flange sealing surface 10, a hydraulic pumping rod 11, a pumping pipe 12, a small four-way oil pipe 13, a Christmas tree 14, and a hydraulic pumping unit body 15, wherein the hydraulic pumping unit body 15 is installed with a hydraulic pumping unit flange 1, fixed by bolts, and the wellhead is installed with a wellhead flange 8, and the hydraulic pumping unit flange 1 is fixed by bolts. A support column 5 is installed between the oil machine flange 1 and the wellhead flange 8. One end of the support column 5 passes through the flange hole of the hydraulic pumping unit flange 1. Concave gaskets 2 and convex gaskets 3 are installed on the upper and lower surfaces of the connection and are locked and fixed by locking nuts 4. The other end of the support column 5 is connected to the wellhead flange 8 and is locked and fixed by wellhead flange fastening nuts 6 and gaskets 7. The special sealing ring 9 is connected to the small four-way oil pipe 13; the sealing surface 10 of the hydraulic pumping unit flange is connected to the special sealing ring 9, a hydraulic pumping rod 11 is installed in the hydraulic pumping unit body 15, and an oil pumping pipe 12 is arranged in the well.

[0025] The special sealing ring 9 is a single-sided spherical structure.

[0026] In this connection device, the special sealing ring 9, the hydraulic pumping unit flange sealing surface 10, and the small four-way oil pipe 13 play a sealing role, and the special sealing ring 9 also plays a role of a rotating fulcrum; the wellhead flange fastening nut 6, the gasket 7, the wellhead flange 8, play a role of fixing the support column 5; the concave gasket 2, the convex gasket 3, the locking nut 4, and the support column 5 play a role in adjusting the hydraulic pumping unit flange 1 to rotate and fix through the special sealing ring 9, wherein the locking nut 4 and the hydraulic pumping unit flange 1 will have a smaller contact area after an angle is generated, thereby reducing the friction force and making it easy to loosen. In the designed device, the concave gasket 2 and the convex gasket 3 are selected according to needs. Usually, the convex inner hole is small and close to one side of the nut, and the concave inner hole is large and close to one side of the flange. When the concave gasket 2 and the convex gasket 3 are locked by the nut, they can not only adjust the height, but also increase the contact area to prevent loosening.

[0027] This connection device can be used in heavy wellheads, simple wellheads and other wellheads and related applications to adjust the angle between the hydraulic pumping unit flange 1 and the wellhead flange 8 (i.e., the hydraulic pumping rod 11 and the oil pipe 12) within ±3°. (If it exceeds ±3°, data analysis is required. If it is used for non-stress pipeline connection, the stress analysis can be ignored and the angle can reach ±45°).

[0028] Example 2

[0029] Combined with Figure 6 , other structures are the same as those in Example 1, except that the special sealing ring 9 is a double-sided spherical structure.

[0030] Example 3

[0031] Combined with Figure 7 , the other structures are the same as those of Example 1, except that the sealing ring is a conical sealing ring. The conical sealing ring is selected, the sealing ring cannot be rotated, and the angle cannot be adjusted. It can be used in a new well or used to adjust the angle between the hydraulic pumping unit flange 1 and the wellhead flange 8 (that is, the hydraulic sucker rod 11 and the oil pipe 12) within the range of ±0.5.

Claims

1. A device for connecting a hydraulic pumping unit to a wellhead, comprising a hydraulic pumping unit flange (1), a concave gasket (2), a convex gasket (3), a locking nut (4), a support column (5), a wellhead flange fastening nut (6), a gasket (7), a wellhead flange (8), a special sealing ring (9), a hydraulic pumping unit flange sealing surface (10), a hydraulic pumping rod (11), a pumping pipe (12), a small four-way oil pipe (13), a Christmas tree (14), and a hydraulic pumping unit body (15), characterized in that: The hydraulic pumping unit body (15) is installed with a hydraulic pumping unit flange (1) and fixed by bolts. The wellhead is installed with a wellhead flange (8). A support column (5) is installed between the hydraulic pumping unit flange (1) and the wellhead flange (8). One end of the support column (5) is connected to the wellhead flange (8) and is locked and fixed by a wellhead flange fastening nut (6) and a gasket (7). The other end of the support column (5) passes through the flange hole of the hydraulic pumping unit flange (1). Concave gaskets (2) and convex gaskets (3) are installed on the upper and lower surfaces of the connection and are locked and fixed by a locking nut (4). The hydraulic A small four-way oil pipe (13) is installed below the pumping unit flange (1), a seal is arranged between the hydraulic pumping unit flange (1) and the small four-way oil pipe (13), the sealing surface of the hydraulic pumping unit flange (1) is the hydraulic pumping unit flange sealing surface (10), the special sealing ring (9) cooperates with the hydraulic pumping unit flange sealing surface (10) to seal, a hydraulic pumping rod (11) is installed in the hydraulic pumping unit body (15), a pumping pipe (12) is arranged in the well, the hydraulic pumping unit flange sealing surface (10) is a conical surface, the concave gasket is a conical surface, and the convex gasket is a spherical surface.

2. A hydraulic pumping unit and wellhead connection device according to claim 1, characterized in that: The special sealing ring (9) is a spherical surface.

3. A hydraulic pumping unit and wellhead connection device according to claim 1 or 2, characterized in that: The special sealing ring (9) is a single-sided spherical surface.

4. A hydraulic pumping unit and wellhead connection device according to claim 1 or 2, characterized in that: The special sealing ring (9) is a double-sided spherical surface.

5. The hydraulic pumping unit and wellhead connection device according to claim 1, characterized in that: The special sealing ring (9) has a conical surface.

6. A hydraulic pumping unit and wellhead connection device according to claim 1, characterized in that: There are four support columns (5).

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