Polish rod deviation-adjusting sealing well mouth special for screw pump

Abstract

The utility model relates to a screw pump system, in particular to a polish rod deviation-adjusting sealing well mouth special for a screw pump, which comprises an eccentric sealing seat, an eccentric shaft, a sealing ring, a sealing ring and a sealing ring, the eccentric sealing seat comprises a connecting cylinder and an eccentric ring, and the eccentric ring is eccentrically arranged at the bottom of the connecting cylinder; the sealing flange is arranged above the eccentric ring and is connected with a wellhead four-way joint; the sealing gasket is arranged between the eccentric ring and the wellhead four-way joint; and the rotary sealing device is arranged between the connecting cylinder and the driving polish rod and is used for rotary sealing of the driving polish rod. According to the polish rod deviation-adjusting sealing wellhead special for the screw pump, the problem that in the prior art, when a polish rod is driven to rotate, radial run-out exists due to the fact that the polish rod and an underground rod column are not concentric is solved, and the problems that well liquid leaks due to untight sealing, and replacement and maintenance are needed frequently are solved.

Description

Technical Field

[0001] The utility model relates to a screw pump system, in particular to a polished rod deviation adjustment and sealing wellhead special for a screw pump. Background Art

[0002] With the gradual expansion of the application of downhole screw pumps in oilfield oil production lifting equipment, the continuity of lifting, noise, and floor space are better than other artificial lifting equipment. However, there are still some problems with the existing supporting special wellhead parts. For example, due to the misalignment of the driving rod and the rotating sealing mechanism in the configuration, the driving rod has eccentric movement, and the sealing often fails, resulting in well fluid leakage, which requires frequent manual maintenance. Utility Model Content

[0003] In order to solve the above-mentioned problem that when the driving rod rotates, there is radial runout due to the non-concentricity of the rod column, which leads to leakage of well fluid due to poor sealing and frequent need for replacement and maintenance, the utility model provides a screw pump dedicated polished rod deflection sealing wellhead, and the specific technical solution is as follows:

[0004] A screw pump-specific polished rod eccentric adjustment and sealing wellhead comprises: an eccentric sealing seat, comprising a connecting tube and an eccentric ring, wherein the eccentric ring is eccentrically provided with the bottom of the connecting tube; a sealing flange, which is arranged above the eccentric ring and connected to the wellhead spool; a sealing gasket, which is arranged between the eccentric ring and the wellhead spool; and a rotary sealing device, which is arranged between the connecting tube and the driving polished rod and is used for rotary sealing of the driving polished rod.

[0005] Preferably, an eccentric groove is provided on the sealing flange, and the eccentric ring is inserted into the eccentric groove.

[0006] Preferably, the rotary sealing device includes: a lower sealing packing, which is arranged between the connecting tube and the driving rod; a lower pressing sleeve, which is movably arranged on the driving rod and is located above the lower sealing packing; and a clamping cap, which is arranged at the top of the connecting tube and is clamped on the top of the lower pressing sleeve.

[0007] Furthermore, it also includes: an upper sealing cylinder, which is arranged at the top of the connecting cylinder and pressed against the top of the lower pressing sleeve; an upper sealing packing, which is arranged between the upper sealing cylinder and the driving light rod; and an upper pressing sleeve, which is movably arranged on the driving light rod and is located above the upper sealing packing, and the pressing cap is arranged at the top of the upper sealing cylinder and pressed against the top of the upper pressing sleeve.

[0008] Preferably, the sealing flange is provided with an adjustment hole, the adjustment hole is inserted on the connecting tube, and the diameter of the adjustment hole is larger than the diameter of the connecting tube.

[0009] Preferably, a sealing groove is provided at the top of the wellhead cross-way, and the sealing gasket is arranged in the sealing groove.

[0010] Preferably, it also includes: a conversion joint, which is arranged on both sides of the wellhead four-way.

[0011] Furthermore, one end of the conversion joint is provided with a connecting thread, and the other end is provided with a flange or a clamp for connection.

[0012] Compared with the prior art, the utility model has the following beneficial effects:

[0013] The utility model provides a special polished rod deviation adjustment sealing wellhead for a screw pump, which overcomes the problem of radial runout due to non-concentricity with the downhole rod column when the polished rod is driven to rotate, solves the problem of well fluid leakage caused by poor sealing and the frequent need for replacement and maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 is a structural schematic diagram of embodiment 1;

[0015] Figure 2 It is a structural schematic diagram of an eccentric sealing seat;

[0016] Figure 3 is a top view of the eccentric seal seat;

[0017] Figure 4 It is a schematic diagram of the structure of the wellhead cross;

[0018] Figure 5 is a structural diagram of Embodiment 2;

[0019] Figure 6 It is a schematic diagram of the structure of the conversion joint;

[0020] Figure 7 Schematic diagram of an embodiment installed on a downhole screw pump system. DETAILED DESCRIPTION

[0021] The utility model is now further described with reference to the accompanying drawings.

[0022] Embodiment 1

[0023] like Figures 1 to 4As shown, a screw pump dedicated polished rod eccentric adjustment sealing wellhead includes an eccentric sealing seat 1, a sealing flange 3, a sealing gasket 2 and a rotary sealing device. The eccentric sealing seat 1 includes a connecting tube 12 and an eccentric ring 11 connected in sequence, and the eccentric ring 11 is eccentrically provided with the bottom of the connecting tube 12; the eccentric ring 11 is located at the top of the wellhead spool 4, and the sealing gasket 2 is located between the eccentric ring 11 and the wellhead spool 4. The sealing flange 3 is fixed to the top of the wellhead spool 4 by bolts and is located above the eccentric ring 11, and is used to press the eccentric ring 11 to the top of the wellhead spool 4 through the sealing gasket 2. The sealing flange 3 is provided with an adjustment hole 32, and the adjustment hole 32 is movably inserted in the connecting tube 12. The diameter of the adjustment hole 32 is larger than the diameter of the connecting tube 12, which is convenient for rotating the eccentric sealing seat 1. The rotary sealing device is arranged between the connecting tube 12 and the driving polished rod 5, and is used to drive the rotary seal of the polished rod 5.

[0024] The driving rod 5 runs through the entire device. The upper end of the driving rod 5 is connected to the driving device to drive the downhole screw pump rotor to realize rotary pumping. The downhole fluid flows out through the production oil pipe through the two side outlets of the wellhead spool 4.

[0025] During installation, the eccentric E structure of the eccentric sealing seat 1 is used to adjust the center position by 360°, ensuring that the driving polished rod 5 and the downhole rod column remain coaxial, and the sealing pad 2 improves the sealing performance. Since the coaxiality of the driving polished rod 5 and the downhole rod column is improved during installation, the eccentricity of the driving polished rod 5 is reduced, effectively avoiding the eccentric movement of the driving polished rod 5, thereby protecting the sealing device, increasing the service life of the sealing device, reducing well fluid leakage, and eliminating the need for frequent maintenance, thereby reducing the maintenance cycle.

[0026] An eccentric groove 31 is provided at the bottom of the sealing flange 3, and the eccentric ring 11 is inserted into the eccentric groove 31. The eccentric groove 31 is a circular groove, which is used to limit the moving position of the eccentric ring 11, reduce the difficulty of debugging during installation, and enable the eccentric sealing seat 1 to rotate within a set range to adjust the coaxiality, thereby improving the efficiency of installation.

[0027] like Figure 1 As shown, the rotary sealing device includes a lower sealing packing 41, a lower pressure sleeve 42 and a clamping cap 43. The lower sealing packing 41 is movably installed between the connecting tube 12 and the driving light rod 5, and the lower pressure sleeve 42 is movably inserted on the driving light rod 5 and is located above the lower sealing packing 41 and inside the connecting tube 12. The top of the lower pressure sleeve 42 is higher than the top of the connecting tube 12; the clamping cap 43 is installed on the top of the connecting tube 12 through threads, and the clamping cap 43 is clamped on the top of the lower pressure sleeve 42, and is used to compress the lower sealing packing 41 through the lower pressure sleeve 42, and compress the lower sealing packing 41 to realize rotary dynamic sealing.

[0028] like Figure 1As shown, in order to further improve the reliability and stability of the rotary seal, it also includes an upper sealing cylinder 46, an upper sealing packing 44 and an upper compression sleeve 45. The upper sealing cylinder 46 is installed on the top of the connecting cylinder 12 by threads and is pressed on the top of the lower compression sleeve 42; the upper sealing packing 44 is movably installed between the upper sealing cylinder 46 and the driving light rod 5; the upper compression sleeve 45 is movably inserted on the driving light rod 5, and is located above the upper sealing packing 44 and at the same time located inside the upper sealing cylinder 46, and the top of the upper compression sleeve 45 is higher than the top of the upper sealing cylinder 46; the compression cap 43 is installed on the top of the upper sealing cylinder 46 by threads at this time, and the compression cap 43 is pressed on the top of the upper compression sleeve 45, which is used to compress the upper sealing packing 44 through the upper compression sleeve 45, and compress the upper sealing packing 44 to realize the rotary dynamic seal.

[0029] The connecting tube 12 is also provided with a locking nut 47 , which is pressed tightly against the upper sealing tube 46 to prevent the upper sealing tube 46 from loosening.

[0030] Embodiment 2

[0031] like Figure 5 and Figure 6 As shown, based on the above embodiment, a conversion joint 6 is further included, and the conversion joint 6 is installed on both sides of the wellhead spool 4. One end of the conversion joint 6 is provided with a connecting thread 61, and the other end is provided with a flange or a clamp 62 for connection. One side of the conversion joint 6 is an external thread for connecting with the internal threads on both sides of the wellhead spool 4, and the other end can be a flange type, a clamp 62 type, or other types for connecting a pipeline.

[0032] Since many domestic oil fields are old non-standard wellheads, the outlet connections of the wellhead spool 4 are generally fixed standard types, and the special spool side interface needs to be specially customized to adapt to the on-site pipeline interface. The conversion joint 6 can be used for different types of connections of on-site pipelines in the oil field, solving the connection interchangeability of the existing wellhead equipment supporting the downhole screw pump and reducing the on-site maintenance cost.

[0033] like Figure 7 As shown, the upper end of the tubing head cross-piece is connected to the lower end of the special cross-piece, two valves are installed on both sides to connect with the oilfield surface pipeline, and the lower end is connected to the production casing.

[0034] The wellhead spool 4 is installed on the top of the tubing head, and the lower end of the wellhead spool 4 is connected to the production tubing through tubing threads, and both sides are connected to the conversion joint 6 through tubing threads.

[0035] By being able to adjust the concentricity of the driving rod 5 and the downhole rod column by 360°, the driving rod is ensured to be concentric with the downhole rod column when rotating, and the compression packing realizes the rotary dynamic seal, which ensures the stability of the wellhead rotary seal and extends the maintenance cycle. The conversion joints 6 on both sides of the special four-way can adapt to the connection of different pipeline interface types, thereby improving work efficiency, reducing equipment investment and installation costs, and having high operational reliability.

[0036] The technical principle of the present invention is described above in combination with specific embodiments. These descriptions are only for explaining the principle of the present invention and cannot be interpreted as limiting the protection scope of the present invention in any way. Based on the explanations here, technicians in this field can think of other specific implementation methods of the present invention without creative work, and these methods will fall within the protection scope of the claims of the present invention.

Claims

1. A polished rod deflection-adjusting and sealing wellhead for a screw pump, characterized in that: include: An eccentric sealing seat (1) comprises a connecting tube (12) and an eccentric ring (11), wherein the eccentric ring (11) is eccentrically provided with the bottom of the connecting tube (12); A sealing flange (3) is arranged above the eccentric ring (11) and is connected to the wellhead spool (4); A sealing gasket (2) is provided between the eccentric ring (11) and the wellhead spool (4); and A rotary sealing device is provided between the connecting tube (12) and the driving polished rod (5) and is used for rotary sealing of the driving polished rod (5).

2. The polished rod deflection adjustment and sealing wellhead for a screw pump according to claim 1, characterized in that: The sealing flange (3) is provided with an eccentric groove (31), and the eccentric ring (11) is inserted into the eccentric groove (31).

3. The polished rod deflection adjustment and sealing wellhead for a screw pump according to claim 1, characterized in that: The rotary sealing device comprises: A lower sealing packing (41) is provided between the connecting tube (12) and the driving polished rod (5); A lower pressing sleeve (42) is movably mounted on the driving polished rod (5) and is located above the lower sealing packing (41); and A pressing cap (43) is arranged on the top of the connecting tube (12) and is pressed against the top of the lower pressing sleeve (42).

4. The polished rod deflection adjustment and sealing wellhead for a screw pump according to claim 3, characterized in that: Also includes: An upper sealing cylinder (46) is arranged on the top of the connecting cylinder (12) and is pressed tightly against the top of the lower pressing sleeve (42); An upper sealing packing (44) is arranged between the upper sealing cylinder (46) and the driving polished rod (5); as well as The upper pressing sleeve (45) is movably arranged on the driving polished rod (5) and is located above the upper sealing packing (44). The pressing cap (43) is arranged on the top of the upper sealing cylinder (46) and is pressed against the top of the upper pressing sleeve (45).

5. The polished rod deflection adjustment and sealing wellhead for a screw pump according to claim 1, characterized in that: The sealing flange (3) is provided with an adjustment hole (32), the adjustment hole (32) is inserted into the connecting tube (12), and the diameter of the adjustment hole (32) is greater than the diameter of the connecting tube (12).

6. The polished rod deflection adjustment and sealing wellhead for a screw pump according to claim 1, characterized in that: A sealing groove (401) is provided at the top of the wellhead spool (4), and the sealing gasket (2) is arranged in the sealing groove (401).

7. A polished rod deflection adjustment and sealing wellhead for a screw pump according to any one of claims 1 to 6, characterized in that: Also includes: The conversion joints (6) are arranged on both sides of the wellhead spool (4).

8. The polished rod deflection adjustment and sealing wellhead for a screw pump according to claim 7, characterized in that: One end of the conversion joint (6) is provided with a connecting thread (61), and the other end is provided with a flange or a clamp (62) for connection.

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