Sealing structure of throwing-fishing screw pump

By improving the sealing structure, the sealing assembly is ensured to smoothly enter the sealing seat and maintain a seal under high pressure, thus solving the problem of easy damage to the seal of the submersible screw pump and improving the sealing reliability and pump efficiency.

CN223908191UActive Publication Date: 2026-02-13HUAXU TANGSHAN PETROLEUM TECH CO LTD
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Patent Information

Application Number
CN202521337588.X
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2025-06-27
Publication Date
2026-02-13
Estimated Expiration
2035-06-27

AI Technical Summary

Technical Problem

The sealing structure of a submersible screw pump is prone to failure due to impacts or falling off, leading to pump leakage and affecting the normal operation and discharge capacity of the unit.

Method used

The design incorporates a sealing joint, sealing assembly, and sealing seat. The sealing assembly includes a sealing cup, a support seat, and a locking ring. The contact area between the sealing cup and the sealing seat is designed with rounded and pointed corners to ensure smooth entry into the sealing seat and maintain a sealing effect under high pressure.

Benefits of technology

This improved the reliability of the seal and the success rate of pump docking, ensuring the unit operates normally downhole and increasing pump efficiency and discharge capacity.

✦ Generated by Eureka AI based on patent content.

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  • Figure CN223908191U_ABST
    Figure CN223908191U_ABST
Patent Text Reader

Abstract

The utility model relates to a sealing structure of a throwing-pulling screw pump, and belongs to the technical field of submersible screw pumps. According to the technical scheme, a sealing assembly (5) is arranged between a sealing joint (4) and a sealing seat (6); the sealing assembly (5) comprises a sealing leather cup I (5.1), a supporting seat I (5.2), a sealing leather cup II (5.3), a supporting seat II (5.4) and a locking ring (5.5), and the sealing leather cup I, the supporting seat I, the sealing leather cup II and the supporting seat II are sequentially arranged on the sealing joint in a sleeving manner and are locked through the locking ring; the two sides of the first sealing leather cup and the two sides of the second sealing leather cup make contact with the sealing base, the two ends of the side face are provided with a round corner part and a sharp corner part respectively, and the round corner part is close to the locking ring. The butt joint success rate of the throwing and fishing screw pump is improved, the sealing reliability is improved, when the screw pump goes wrong, only the screw pump needs to be lifted out, other parts of a unit do not move, normal underground operation of the unit is guaranteed, and the pump efficiency and the displacement are improved.
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Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of fishing screw rod pump sealing structure, belong to submersible screw rod pump technical field. BACKGROUND

[0002] Submersible screw rod pump is suitable for high viscosity, high sand, high oil-gas ratio, and displacement smaller crude oil exploitation operation, and has wide application in oil production. But with the continuous development of oil production technology, the most vulnerable part of submersible screw rod pump unit is screw rod pump, which needs to be pulled out in well operation, and the downhole operation period is long, the cost is high, and the cable is easy to be damaged during the process of pulling out. As shown in the figure, the old sealing structure includes old sealing joint 19, sealing O ring 20 and old sealing seat 21, and four sealing O rings are sleeved on the old sealing joint. There is a certain error in the sealing O ring itself, and there are different cases of tightness after installation. In the process of downhole operation, the sealing structure is at the lowermost end of the screw rod pump, and may be knocked or dropped when encountering foreign matter. When the sealing assembly is butted, due to the fast falling speed and large impact force, the sealing O ring is easily sheared when entering the inner cavity of the old sealing seat, resulting in sealing failure. These phenomena will lead to loose sealing of the unit, resulting in pump leakage and reducing pump efficiency. Figure 1 CONTENT OF UTILITY MODEL

[0003] The utility model aims at providing a kind of fishing screw rod pump sealing structure, sealing assembly can smoothly enter sealing seat, not be knocked, improve the sealing performance of unit;When screw rod pump has problem, only needs to pull out screw rod pump, other parts of unit are not moved, ensure the normal operation of unit in well, improve pump efficiency and displacement, solve the above problems existing in background art.

[0004] The technical scheme of the utility model is:

[0005] A kind of fishing screw rod pump sealing structure, including sealing joint, sealing assembly and sealing seat, the sealing joint is arranged at the head of screw rod pump stator, and is equipped with cavity inside;Spiral pump rotor is arranged in the screw rod pump stator, and the spiral pump rotor is connected with universal shaft by passing through the cavity of sealing joint;The screw rod pump stator is connected with sealing seat by connecting seat, and the sealing joint is arranged inside the sealing seat, and sealing assembly is arranged between the sealing joint and the sealing seat;Sealing cup one, support seat one, sealing cup two, support seat two and locking ring are included in sealing assembly, sealing cup one, support seat one, sealing cup two and support seat two are sequentially sleeved on the sealing joint, and are locked by locking ring;The two sides of sealing cup one and sealing cup two are in contact with the sealing seat, and the two ends of side face are respectively rounded corner part and sharp corner part, and rounded corner part is close to locking ring.

[0006] ​The number of the support seats and the sealing cups is multiple, and the number of the support seats is same as that of the sealing cups; the support seat is arranged between the sealing cup and the sealing cup and between the adjacent sealing cups.

[0007] The round corner part structure of the sealing cup and the sealing cup is same, the cross section of the sharp corner part of the sealing cup and the sealing cup is inclined surface, and the inclined direction of the inclined surface is opposite.

[0008] The two sides of the support seat and the support seat are in contact with the sealing seat, the two ends of the side surface of the support seat are matched with the round corner part of the sealing cup and the sharp corner part of the sealing cup respectively, and the two ends of the side surface of the support seat are matched with the round corner part of the sealing cup and the locking ring respectively.

[0009] The head of the screw pump rotor is provided with a rotor female head, the rotor female head is connected with a rotor male head, and the rotor male head is connected with a universal shaft.

[0010] The sealing seat, the rotor female head, the rotor male head and the universal shaft are arranged in the universal shaft shell; the two ends of the universal shaft shell are connected with a connecting seat and a suction inlet assembly respectively.

[0011] The sealing seat is threadedly connected with the connecting seat.

[0012] The suction inlet assembly is provided with a liquid inlet, and the end of the suction inlet assembly away from the universal shaft shell is provided with a protector and a permanent magnet motor.

[0013] The tail of the screw pump stator is provided with a connecting barrel, the connecting barrel is provided with a limiting block, the screw pump rotor is prevented from moving upward in the lifting process due to the reaction force, the fishing connection is invalid, and the unit cannot normally operate.

[0014] The end of the connecting barrel away from the screw pump stator is connected with a fishing connector, and the fishing connector is connected with a fishing tool.

[0015] The screw pump stator, the connecting barrel and the fishing connector are arranged in the oil pipe.

[0016] The fishing connector is provided with an upward inclined liquid outlet hole.

[0017] The universal shaft, the protector and the permanent magnet motor are all common devices in the field.

[0018] The sealing cups are separated by the support seats, and finally the sealing cups and the support seats are tightly connected and fixed by the locking ring, so that the sealing cups are prevented from falling off. The contact place of the sealing cup and the sealing seat is round first and sharp second, the round corner part is ensured to be in contact with the sealing seat first, the sealing assembly is ensured to enter the sealing seat smoothly and not to be knocked, meanwhile, the pressure of the downhole liquid is conducted outward from the sealing sharp corner part, when the pressure is larger, an upward force is provided for the sealing sharp corner part, the sealing is more strict, and the sealing performance of the whole unit is greatly improved.

[0019] The utility model discloses the beneficial effect is: improved the butt joint success rate of fishing screw rod pump, increased the reliability of sealing, when the screw rod pump has the problem, only needs to take out the screw rod pump, and other parts of unit are not moved, guarantees the normal operation of unit in the well, improves the pump efficiency and displacement. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 It is old type sealing structure schematic diagram;

[0021] Figure 2 It is the utility model embodiment structure schematic diagram;

[0022] Figure 3 It is the utility model embodiment sealing assembly structure schematic diagram;

[0023] Figure 4 It is the utility model embodiment support seat one structure schematic diagram;

[0024] Figure 5 It is the utility model embodiment support seat two structure schematic diagram;

[0025] Figure 6 It is the utility model embodiment sealing leather bowl one structure schematic diagram;

[0026] Figure 7 It is the utility model embodiment sealing leather bowl two structure schematic diagram;

[0027] Figure 8 It is the utility model embodiment assembly drawing and liquid flow direction drawing;

[0028] In the drawing: screw rod pump stator 1, screw pump rotor 2, connecting seat 3, sealing joint 4, sealing assembly 5, sealing leather bowl one 5.1, support seat one 5.2, sealing leather bowl two 5.3, support seat two 5.4, locking ring 5.5, sealing seat 6, universal shaft shell 7, oil pipe 8, universal shaft 9, rotor female head 10, rotor male head 11, suction inlet assembly 12, liquid inlet 13, connecting barrel 14, limit block 15, fishing joint 16, liquid outlet hole 17, fishing device 18, old type sealing joint 19, sealing O ring 20, old type sealing seat 21. DETAILED DESCRIPTION

[0029] The utility model is further explained by example in combination with the drawings.

[0030] The utility model provides a kind of fishing screw rod pump sealing structure, including sealing joint 4, sealing assembly 5 and sealing seat 6, the sealing joint 4 is arranged in the head of screw rod pump stator 1, and inside is equipped with cavity;Spiral pump rotor 2 is arranged in the screw rod pump stator 1, spiral pump rotor 2 is connected with universal shaft 9 by the cavity of sealing joint 4;The screw rod pump stator 1 is connected with sealing seat 6 by connecting seat 3, sealing joint 4 is arranged in sealing seat 6, and sealing assembly 5 is equipped between sealing joint 4 and sealing seat 6;Sealing assembly 5 includes sealing cup one 5.1, support seat one 5.2, sealing cup two 5.3, support seat two 5.4 and locking ring 5.5, sealing cup one 5.1, support seat one 5.2, sealing cup two 5.3 and support seat two 5.4 are sequentially set on sealing joint 4, and are locked by locking ring 5.5;The two sides of sealing cup one 5.1 and sealing cup two 5.3 are in contact with sealing seat 6, and the two ends of side face are round angle part and sharp angle part respectively, and round angle part is close to locking ring 5.5 and is arranged.

[0031] The number of support seat one 5.2 and sealing cup two 5.3 is multiple, and the number is same;Support seat one 5.2 is arranged between sealing cup one 5.1 and sealing cup two 5.3 and between adjacent sealing cup two 5.3.

[0032] The round angle part structure of sealing cup one 5.1 and sealing cup two 5.3 is same, the cross section of sharp angle part of sealing cup one 5.1 and sealing cup two 5.3 is inclined surface, and the inclination direction of inclined surface is opposite.

[0033] The two sides of support seat one 5.2 and support seat two 5.4 are in contact with sealing seat 6, the two ends of side face of support seat one 5.2 are matched with round angle part of sealing cup one 5.1 and sharp angle part of sealing cup two 5.3 respectively, and the two ends of side face of support seat two 5.4 are matched with round angle part of sealing cup two 5.3 and locking ring 5.5 respectively.

[0034] The head of spiral pump rotor 2 is installed rotor female head 10, rotor female head 10 is connected with rotor male head 11, and rotor male head 11 is connected with universal shaft 9.

[0035] Sealing seat 6, rotor female head 10, rotor male head 11 and universal shaft 9 are all arranged in universal shaft shell 7;Universal shaft shell 7 two ends are connected with connecting seat 3 and suction inlet assembly 12 respectively.

[0036] Sealing seat 6 is connected with connecting seat 3 by screw thread.

[0037] Suction inlet assembly 12 is equipped with liquid inlet 13, and the end of suction inlet assembly 12 away from universal shaft shell 7 is provided with protector and permanent magnet motor.

[0038] The tail of the screw pump stator 1 is provided with a connecting cylinder 14, and a limiting block 15 is arranged in the connecting cylinder 14 to prevent the screw pump rotor from moving upward due to the reaction force during lifting, so that the fishing connection fails and the unit cannot normally operate.

[0039] The end of the connecting cylinder 14 away from the screw pump stator 1 is connected with a fishing joint 16, and the fishing joint 16 is connected with a fishing device 18.

[0040] The screw pump stator 1, the connecting cylinder 14 and the fishing joint 16 are arranged inside the oil pipe 8.

[0041] The fishing joint 16 is provided with an upwardly inclined liquid outlet hole 17.

[0042] In this embodiment, the accompanying drawings are referred to Figures 2-8 A fishing screw pump sealing structure comprises a sealing joint 4, a sealing assembly 5 and a sealing seat 6, and the sealing assembly 5 comprises a sealing cup 1 5.1, a support seat 1 5.2, a sealing cup 2 5.3, a support seat 2 5.4 and a locking ring 5.5.

[0043] The right end of the suction inlet assembly 12 is a protector and a permanent magnet motor, which are well-known products in the art. The suction inlet assembly 12 is provided with a universal shaft 9, the left end of the universal shaft 9 is connected with a rotor male head 11, the rotor male head 11 is connected with a rotor female head 10, the sealing seat 6 is connected with the connecting seat 3 through threads, and the universal shaft shell 7 connects the suction inlet assembly 12 and the connecting seat 3. This part is lowered into the well first when lowering into the well.

[0044] The screw pump stator 1 and the screw pump rotor 2 are assembled, the sealing joint 4 is installed at the head of the screw pump stator 1, and the rotor female head 10 is installed at the head of the screw pump rotor 2; the sealing assembly 5 is sequentially installed in the sealing area of the sealing joint 4; the tail of the screw pump stator 1 is provided with the connecting cylinder 14, and the limiting block 15 is arranged in the connecting cylinder 14 to prevent the screw pump rotor from moving upward due to the reaction force during lifting, so that the fishing connection fails and the unit cannot normally operate. The other end of the connecting cylinder 14 is connected with the fishing joint 16, and the fishing joint 16 is provided with the upwardly inclined liquid outlet hole 17. The other end of the fishing joint is connected with the fishing device 18, and this device is used for fishing operation of the screw pump. During operation, the fishing device is connected with this part along the oil pipe to the unit for docking.

[0045] When downhole operation, first permanent magnet motor, protector, suction inlet assembly 12, a plurality of oil pipes 8 and power cable are lowered into the well. There is a fishing operation vehicle at the wellhead, the fishing tool 18 is connected through the steel wire rope, the screw pump part is launched along the inner diameter of the oil pipe into the well and is connected with the lowered machine set, after being launched to the bottom, the fishing tool 18 is connected with the rotor female head 10 and the rotor male head 11, the power of the motor can be transmitted to the rotor of the pump. The sealing assembly 5 and the sealing seat 6 are connected, and the sealing effect is achieved, the backflow and leakage of the liquid flowing out of the liquid outlet hole of the fishing tool 16 are prevented, and the pump efficiency is reduced.

[0046] When the machine set is running, the well fluid enters the machine set from the liquid inlet of the suction inlet assembly, enters the screw pump stator along the inner cavity of the universal shaft shell 7, is lifted by the screw pump to the outlet of the screw pump, flows to the annulus of the oil pipe through the liquid outlet hole of the fishing tool 16, and is transported to the ground upward, and part of the liquid will flow downward along the annulus to the sealing assembly 5 and the sealing seat 6. Since the sealing structure is provided at the place, the liquid does not flow downward any more. The sealing structure has the following effects: 1. The liquid in the oil pipe is prevented from leaking downward, thereby reducing the pump efficiency; 2. If leakage occurs, the backflow of the leaked liquid is opposite to the normal liquid flow direction, and the normal liquid flow is disturbed; 3. The place bears a high pressure.

[0047] The sealing structure is very critical and is related to the efficiency and service life of the whole machine set. The utility model changes the old O-ring sealing structure into a leather cup sealing structure, the sealing leather cups are separated by support seats, finally the sealing leather cups and the support seats are tightly connected and fixed by the locking ring 5.5, so as to prevent falling off. The place where the sealing leather cup contacts with the sealing seat is round first and then sharp, the smooth part is ensured to contact with the sealing seat first, so that the sealing structure can smoothly enter the sealing seat and is not knocked. At the same time, the pressure of the downhole liquid is conducted outward from the sealing sharp corner part, when the pressure is greater, an upward force is generated on the sealing sharp corner part, the sealing is more strict, and the sealing performance of the whole machine set is greatly improved.

[0048] The utility model improves the connection success rate of the fishing screw pump, increases the reliability of the sealing, and improves the pump efficiency and the displacement.

Claims

1. A fishing screw pump seal structure, characterized by: The utility model provides a sealing structure of screw pump, including sealing joint (4), sealing assembly (5) and sealing seat (6), sealing joint (4) sets up in the head of screw pump stator (1), and is equipped with cavity inside, spiral pump rotor (2) is arranged in screw pump stator (1), and spiral pump rotor (2) is connected with universal shaft (9) through the cavity of sealing joint (4), screw pump stator (1) is connected with sealing seat (6) through connecting seat (3), and sealing joint (4) sets up inside sealing seat (6), and sealing joint (4) is equipped with sealing assembly (5) between sealing seat (6), and sealing assembly (5) includes sealing cup one (5.1), support seat one (5.2), sealing cup two (5.3), support seat two (5.4) and locking ring (5.5), and sealing cup one (5.1), support seat one (5.2), sealing cup two (5.3) and support seat two (5.4) are sequentially set on sealing joint (4) and are locked through locking ring (5.5), and both sides of sealing cup one (5.1) and sealing cup two (5.3) are in contact with sealing seat (6), and the both ends of side surface are rounded portion and sharp corner portion respectively, and rounded portion is close to locking ring (5.5) and sets up.

2. A fishing screw pump sealing structure according to claim 1, characterized in that: The number of support seat one (5.2) and sealing cup two (5.3) is multiple, and the number is same, and support seat one (5.2) is arranged between sealing cup one (5.1) and sealing cup two (5.3) and between adjacent sealing cup two (5.3).

3. A fishing screw pump sealing structure according to claim 1 or 2, characterized in that: The rounded portion structure of sealing cup one (5.1) and sealing cup two (5.3) is same, the cross section of sharp corner portion of sealing cup one (5.1) and sealing cup two (5.3) is inclined surface, and the inclination direction of inclined surface is opposite.

4. A fishing screw pump sealing structure according to claim 3, characterized in that: The both sides of support seat one (5.2) and support seat two (5.4) are in contact with sealing seat (6), and the both ends of side surface of support seat one (5.2) are matched with rounded portion of sealing cup one (5.1) and sharp corner portion of sealing cup two (5.3) respectively, and the both ends of side surface of support seat two (5.4) are matched with rounded portion of sealing cup two (5.3) and locking ring (5.5) respectively.

5. The fishing screw pump sealing structure according to claim 1 or 2, characterized in that: The head of spiral pump rotor (2) is installed rotor female head (10), rotor female head (10) is connected with rotor male head (11), and rotor male head (11) is connected with universal shaft (9).

6. A fishing screw pump sealing structure according to claim 5, characterized in that: The sealing seat (6), rotor female head (10), rotor male head (11) and universal shaft (9) are arranged in the universal shaft housing (7); the both ends of the universal shaft housing (7) are connected with the connecting seat (3) and the suction inlet assembly (12) respectively.

7. The fishing screw pump sealing structure according to claim 1 or 2, characterized in that: The sealing seat (6) is threadedly connected with the connecting seat (3).

8. A fishing screw pump sealing structure according to claim 6, characterized in that: The suction inlet assembly (12) is provided with a liquid inlet (13), and the end of the suction inlet assembly (12) away from the universal shaft housing (7) is provided with a protector and a permanent magnet motor.

9. The fishing screw pump sealing structure according to claim 1 or 2, characterized in that: The tail of the screw pump stator (1) is installed with a connecting cylinder (14), and the connecting cylinder (14) is provided with a limiting block (15) inside.

10. A fishing screw pump sealing structure according to claim 9, characterized in that: The end of the connecting cylinder (14) away from the screw pump stator (1) is connected with a fishing joint (16), and the fishing joint (16) is connected with a fishing tool (18).