Upper and lower hard sealing rod type oil well pump

Abstract

The utility model relates to an upper and lower hard sealing rod type oil well pump, which belongs to the technical field of oil well pumps, and comprises a plunger assembly, a pump cylinder locking assembly arranged outside the plunger assembly, an outer cylinder assembly arranged outside the pump cylinder locking assembly, the pump cylinder locking assembly comprises a pump cylinder, the upper end of the pump cylinder is connected with a pump cylinder joint, and the lower end of the pump cylinder is connected with a pump cylinder. A lower sealing and locking device is arranged at the lower end of the pump cylinder and comprises a mandrel, a plurality of sets of sealing components are arranged on the periphery of the mandrel, the outer cylinder assembly comprises an outer cylinder, the outer cylinder is arranged outside the pump cylinder, the upper end of the outer cylinder is connected with an upper sealing connector, and a sealing protrusion is arranged in the middle of the upper sealing connector. A sealing protrusion is arranged at the lower end of the outer cylinder and connected with the periphery of the pump cylinder connector in a sealed mode, a sealing short section is arranged at the lower end of the outer cylinder, a sealing face is arranged in the sealing short section and connected with a plurality of groups of sealing components in a sealed mode, and a series of problems of corrosion, aging, short service life, easy leakage and the like of a soft sealing ring can be effectively avoided by adopting a multi-stage hard sealing mode.

Description

Technical Field

[0001] The utility model relates to a sucker rod pump, specifically to an up-and-down hard-sealed rod pump, belonging to the technical field of sucker rod pumps. Background Art

[0002] At present, most of the rod pumps at home and abroad adopt the design methods of cup packing seals or single-stage hard seals. Cup packing seals are easy to be corroded and aged. After the cup packing seal rod pump is used for a period of time, it is very easy to leak, increasing the number of pump inspections. It is necessary to lift the sucker rod pump from the well to the ground for the replacement of the cup packing seal. This not only increases the maintenance cost but also affects the oil production operation time of the oil well. Single-stage hard seals are difficult to achieve complete sealing. After a period of time, due to corrosion and erosion, the leakage becomes larger and larger, and it is necessary to stop production for pump inspection.

[0003] Therefore, there is an urgent need for a new type of sucker rod pump that can solve the above problems and operate stably for a long time to reduce the oil production cost. Summary of the Invention

[0004] The purpose of the utility model is to overcome the deficiencies of the above traditional technologies and provide an up-and-down hard-sealed rod pump. By adopting a multi-stage hard-seal method, a series of problems such as corrosion, aging, short service life, and easy leakage of the soft sealing ring can be effectively avoided.

[0005] The purpose of the utility model is achieved by the following technical measures: An up-and-down hard-sealed rod pump includes a plunger assembly. An outer barrel locking assembly is arranged outside the plunger assembly. An outer barrel assembly is arranged outside the outer barrel locking assembly. The outer barrel locking assembly includes a barrel. The upper end of the barrel is connected with a barrel joint. The lower end of the barrel is provided with a lower seal locking device. The lower seal locking device includes a mandrel. A plurality of groups of sealing members are arranged on the outer periphery of the mandrel. The outer barrel assembly includes an outer barrel. The outer barrel is arranged outside the barrel. The upper end of the outer barrel is connected with an upper seal joint. The middle part of the upper seal joint has a sealing protrusion. The sealing protrusion is hermetically connected with the outer periphery of the barrel joint. The lower end of the outer barrel is provided with a sealing short section. The inside of the sealing short section has a sealing surface. The sealing surface is hermetically connected with a plurality of groups of sealing members.

[0006] As a further improvement of the above technical solution:

[0007] Each group of sealing members includes a hard sealing ring and a spacer ring.

[0008] A threaded connecting shaft is arranged below a plurality of groups of sealing members. A hard taper sealing ring is arranged at the lower end of the threaded connecting shaft. The lower end of the hard taper sealing ring has a first sealing taper surface that inclines downward and inward. A locking claw is connected below the hard taper sealing ring.

[0009] The lower end of the locking claw has several claw parts, and the several claw parts are evenly distributed on the same circumference, and there is a gap between adjacent two claw parts.

[0010] The lower end of the claw part is provided with a convex part, the upper end of the convex part has a first locking conical surface that inclines upward and inward, and the lower end of the convex part has a first guiding conical surface that inclines downward and inward.

[0011] The lower end of the sealing nipple is connected with a coupling, and the lower end of the coupling is connected with a lower sealing support joint.

[0012] The inside of the lower sealing support joint is hollow, the upper end inside the lower sealing support joint is provided with a second sealing conical surface that inclines downward and inward, the middle part inside the lower sealing support joint is provided with an annular protrusion, the upper end of the annular protrusion has a second guiding conical surface that inclines downward and inward, and the lower end of the annular protrusion has a second locking conical surface that inclines upward and inward.

[0013] The upper end of the pump barrel joint is connected with an oil outlet head, the lower end of the pump barrel is connected with a fixed valve ball joint, the lower end of the fixed valve ball joint is connected with a fixed valve cover, a fixed valve is arranged inside the fixed valve cover, and the lower sealing locking device is arranged at the lower end of the fixed valve cover.

[0014] The lower end of the outer cylinder is connected with a coupling, and the sealing nipple is arranged at the lower end of the coupling.

[0015] The plunger assembly includes a plunger, the upper end of the plunger is connected with an upper oil outlet joint, the upper end of the upper oil outlet joint is connected with a pull rod, the upper end of the pull rod is connected with a valve rod joint, the lower end of the plunger is connected with a traveling valve ball joint, the lower end of the traveling valve ball joint is connected with a traveling valve cover, a traveling valve is arranged inside the traveling valve cover, and the lower end of the traveling valve cover is connected with a traveling valve seat joint.

[0016] Due to the adoption of the above technical solution, compared with the prior art, the advantages of the present utility model are as follows: The present utility model adopts a multi-stage hard sealing method, which can effectively avoid a series of problems such as corrosion, aging, short service life, and easy leakage of soft sealing rings. The sealing protrusion inside the upper sealing joint is hermetically connected with the outer circumference of the pump barrel joint. As the first sealing structure, it plays a role in blocking sediment from entering the lower space and also plays a role in supporting the upper part of the oil pump; the sealing surface inside the sealing nipple forms a piston-type seal with the outer circumferences of several hard sealing rings, and the first sealing conical surface of the hard conical sealing ring forms a conical surface seal with the second sealing conical surface of the lower sealing support joint. At the same time, due to the contact and seat locking of the first locking conical surface and the second locking conical surface, the first sealing conical surface is tightly pressed on the second sealing conical surface, and the sealing effect is better.

[0017] The following further describes the present utility model in conjunction with the drawings and specific embodiments. Description of the Drawings

[0018] Figure 1 This is a schematic structural diagram of an up-and-down hard-sealed rod pump in an embodiment of the present utility model;

[0019] Figure 2 This is a schematic structural diagram of the upper sealing joint in an embodiment of the present utility model;

[0020] Figure 3 This is a schematic structural diagram of the lower sealing locking device in an embodiment of the present utility model;

[0021] Figure 4 This is a schematic structural diagram of the sealing nipple in an embodiment of the present utility model;

[0022] Figure 5 This is a schematic structural diagram of the lower sealing support joint in an embodiment of the present utility model;

[0023] Figure 6 This is a schematic structural diagram of the locking claw in an embodiment of the present utility model;

[0024] Figure 7 is Figure 6 the cross-sectional structural diagram in the A-A direction in

[0025] In the figure, 1-valve rod joint, 2-oil outlet head, 3-pull rod, 4-upper sealing joint, 5-pump barrel joint, 6-pump barrel, 7-upper oil outlet joint, 8-plunger, 9-traveling valve ball joint, 10-traveling valve cover, 11-traveling valve, 12-traveling valve seat joint, 13-outer cylinder, 14-fixed valve ball joint, 15-fixed valve cover, 16-fixed valve, 17-first coupling, 18-lower sealing locking device, 181-core shaft, 182-hard sealing ring, 183-spacer ring, 184-threaded connecting shaft, 185-hard tapered sealing ring, 1851-first sealing cone surface, 186-locking claw, 1861-first locking cone surface, 1862-first guiding cone surface, 1863-claw part, 1864-protruding part, 19-sealing nipple, 20-second coupling, 21-lower sealing support joint, 211-second sealing cone surface, 212-second guiding cone surface, 213-second locking cone surface, 214-annular protrusion. Specific embodiments

[0026] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0027] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present utility model.

[0028] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present utility model, the meaning of "a plurality" is two or more, unless otherwise specifically defined. Embodiment

[0029] As Figures 1-7 shown, a rod-type oil pump with upper and lower hard seals includes a plunger assembly. An outer barrel locking assembly is provided outside the plunger assembly, and an outer barrel assembly is provided outside the outer barrel locking assembly. The outer barrel locking assembly includes a pump barrel 6. The upper end of the pump barrel 6 is connected to a pump barrel joint 5, the upper end of the pump barrel joint 5 is connected to an oil outlet head 2, the lower end of the pump barrel 6 is connected to a fixed valve ball joint 14, the lower end of the fixed valve ball joint 14 is connected to a fixed valve cover 15, a fixed valve 16 is provided inside the fixed valve cover 15, the lower end of the fixed valve cover 15 is connected to a lower seal locking device 18. The lower seal locking device 18 includes a mandrel 181. A plurality of groups of sealing members are provided on the outer periphery of the mandrel 181. Each group of sealing members includes a hard sealing ring 182 and a spacer ring 183. A threaded connecting shaft 184 is provided below the plurality of groups of sealing members. A hard tapered sealing ring 185 is provided at the lower end of the threaded connecting shaft 184. The lower end of the hard tapered sealing ring 185 has a first sealing cone surface 1851 that slopes downward and inward. A locking claw 186 is connected below the hard tapered sealing ring 185. The lower end of the locking claw 186 has a plurality of claw portions 1863. The plurality of claw portions 1863 are evenly distributed on the same circumference. There is a gap between adjacent two claw portions 1863. In this embodiment, the number of claw portions 1863 is 4. A protruding portion 1864 is provided at the lower end of the claw portion 1863. The upper end of the protruding portion 1864 has a first locking cone surface 1861 that slopes upward and inward. The lower end of the protruding portion 1864 has a first guiding cone surface 1862 that slopes downward and inward.

[0030] The hard sealing ring 182 and the hard tapered sealing ring 185 are made of metal materials with low hardness, such as "brass" materials, which are easier to meet the sealing requirements. As independent hard sealing rings, the hard sealing ring 182 and the hard tapered sealing ring 185 can be replaced according to needs during pump inspection, which is convenient, fast, and easy to operate. The multi-stage hard sealing method can effectively avoid a series of problems of soft sealing rings, such as corrosion, aging, short service life, and easy leakage.

[0031] The plunger assembly includes a plunger 8. The upper end of the plunger 8 is connected to an upper oil outlet joint 7. The upper end of the upper oil outlet joint 7 is connected to a pull rod 3. The upper end of the pull rod 3 is connected to a valve stem joint 1. The lower end of the plunger 8 is connected to a traveling valve ball joint 9. The lower end of the traveling valve ball joint 9 is connected to a traveling valve cover 10. A traveling valve 11 is arranged inside the traveling valve cover 10. The lower end of the traveling valve cover 10 is connected to a traveling valve seat joint 12.

[0032] The upper oil outlet joint 7, the plunger 8, the traveling valve ball joint 9, the traveling valve cover 10, the traveling valve 11, and the traveling valve seat joint 12 are all arranged inside the pump barrel 6 and reciprocate up and down inside the pump barrel 6. The pull rod 3 passes through the pump barrel joint 5 and the oil outlet head 2.

[0033] The outer barrel assembly includes an outer barrel 13. The outer barrel 13 is arranged outside the pump barrel 6. The upper end of the outer barrel 13 is connected to an upper sealing joint 4. The middle part of the upper sealing joint 4 has a sealing protrusion 41, and the sealing protrusion 41 is hermetically connected to the outer periphery of the pump barrel joint 5. The lower end of the outer barrel 13 is connected to a first coupling 17. The lower end of the first coupling 17 is connected to a sealing nipple 19. The inside of the sealing nipple 19 has a sealing surface 191, and the sealing surface 191 is hermetically connected to several groups of sealing components. The lower end of the sealing nipple 19 is connected to a second coupling 20. The lower end of the second coupling 20 is connected to a lower sealing support joint 21. The inside of the lower sealing support joint 21 is hollow. A second sealing cone surface 211 that is inclined downward and inward is arranged at the upper end inside the lower sealing support joint 21. An annular protrusion 214 is arranged in the middle inside the lower sealing support joint 21. The upper end of the annular protrusion 214 has a second guiding cone surface 212 that is inclined downward and inward. The lower end of the annular protrusion 214 has a second locking cone surface 213 that is inclined upward and inward.

[0034] During downhole operation, first, the outer barrel assembly is lowered into the bottom of the well along with the tubing. After the plunger assembly and the pump barrel locking assembly are assembled into one, they are lowered into the outer barrel assembly along with the sucker rod. The first guiding cone surface 1862 of the locking claw 186 first contacts the second guiding cone surface 212 of the lower sealing support joint 21, and then the lower end of the locking claw 186 passes through the cylindrical inner hole formed by the annular protrusion 214. At this time, the first locking cone surface 1861 and the second locking cone surface 213 contact and achieve seat locking, and at this time, the entire oil pump is installed.

[0035] The sealing protrusion 41 inside the upper sealing joint 4 is hermetically connected to the outer periphery of the pump barrel joint 5. As the first sealing structure, it plays a role in blocking sediment from entering the lower space and also serves as the upper support of the sucker rod pump.

[0036] The sealing surface 191 inside the sealing nipple 19 forms a piston-type seal with the outer peripheral surfaces of a number of hard sealing rings 182. The first sealing cone surface 1851 of the hard tapered sealing ring 185 forms a tapered surface seal with the second sealing cone surface 211 of the lower sealing support joint 21. At the same time, since the first locking cone surface 1861 and the second locking cone surface 213 come into contact and achieve seat locking, the first sealing cone surface 1851 is tightly pressed against the second sealing cone surface 211, resulting in a better sealing effect.

[0037] The above are only the preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A rod pump with upper and lower hard seals, characterized in that: It includes a plunger assembly. A pump barrel locking assembly is provided outside the plunger assembly, and an outer barrel assembly is provided outside the pump barrel locking assembly. The pump barrel locking assembly includes a pump barrel (6). The upper end of the pump barrel (6) is connected with a pump barrel joint (5). The lower end of the pump barrel (6) is provided with a lower sealing and locking device (18). The lower sealing and locking device (18) includes a mandrel (181). A plurality of groups of sealing members are provided on the outer periphery of the mandrel (181). The outer barrel assembly includes an outer barrel (13). The outer barrel (13) is arranged outside the pump barrel (6). The upper end of the outer barrel (13) is connected with an upper sealing joint (4). The middle part of the upper sealing joint (4) has a sealing protrusion (41). The sealing protrusion (41) is hermetically connected with the outer periphery of the pump barrel joint (5). The lower end of the outer barrel (13) is provided with a sealing nipple (19). The inside of the sealing nipple (19) has a sealing surface (191). The sealing surface (191) is hermetically connected with a plurality of groups of sealing members.

2. The rod pump with upper and lower hard seals according to claim 1, characterized in that: Each group of sealing members includes a hard sealing ring (182) and a spacer ring (183).

3. The up and down hard seal rod type oil pump according to claim 2, characterized in that: A threaded connecting shaft (184) is provided below the plurality of groups of sealing members. The lower end of the threaded connecting shaft (184) is provided with a hard tapered sealing ring (185). The lower end of the hard tapered sealing ring (185) has a first sealing cone surface (1851) that inclines downward and inward. A locking claw (186) is connected below the hard tapered sealing ring (185).

4. The rod pump with upper and lower hard seals according to claim 3, characterized in that: The lower end of the locking claw (186) has a plurality of claw parts (1863). The plurality of claw parts (1863) are evenly distributed on the same circumference. There is a gap between adjacent two claw parts (1863).

5. The rod pump with upper and lower hard seals according to claim 4, characterized in that: The lower end of the claw part (1863) is provided with a protrusion part (1864). The upper end of the protrusion part (1864) has a first locking cone surface (1861) that inclines upward and inward. The lower end of the protrusion part (1864) has a first guiding cone surface (1862) that inclines downward and inward.

6. The rod pump with upper and lower hard seals according to claim 5, characterized in that: The lower end of the sealing nipple (19) is connected with a second coupling (20). The lower end of the second coupling (20) is connected with a lower sealing support joint (21).

7. The rod pump with upper and lower hard seals according to claim 6, wherein: The inside of the lower sealing support joint (21) is hollow. The upper end inside the lower sealing support joint (21) is provided with a second sealing cone surface (211) that inclines downward and inward. The middle part inside the lower sealing support joint (21) is provided with an annular protrusion (214). The upper end of the annular protrusion (214) has a second guiding cone surface (212) that inclines downward and inward. The lower end of the annular protrusion (214) has a second locking cone surface (213) that inclines upward and inward.

8. The rod pump with upper and lower hard seals according to claim 7, characterized in that: The upper end of the pump barrel joint (5) is connected with an oil outlet head (2). The lower end of the pump barrel (6) is connected with a fixed valve ball joint (14). The lower end of the fixed valve ball joint (14) is connected with a fixed valve cage (15). A fixed valve (16) is arranged inside the fixed valve cage (15). The lower sealing and locking device (18) is arranged at the lower end of the fixed valve cage (15).

9. The rod pump with upper and lower hard seals according to claim 8, characterized in that: The lower end of the outer barrel (13) is connected with a first coupling (17). The sealing nipple (19) is arranged at the lower end of the first coupling (17).

10. A kind of up and down hard-sealing rod pump according to claim 9, characterized in that: The plunger assembly includes a plunger (8). The upper end of the plunger (8) is connected to an upper oil outlet joint (7). The upper end of the upper oil outlet joint (7) is connected to a pull rod (3). The upper end of the pull rod (3) is connected to a valve stem joint (1). The lower end of the plunger (8) is connected to a traveling valve ball joint (9). The lower end of the traveling valve ball joint (9) is connected to a traveling valve cover (10). A traveling valve (11) is provided inside the traveling valve cover (10). The lower end of the traveling valve cover (10) is connected to a traveling valve seat joint (12).

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