Large-displacement high-lift screw pump

Abstract

The utility model is suitable for the technical field of ground driving screw oil-well pumps, and provides a large-displacement high-lift screw pump which comprises a screw pump stator, a transition oil pipe and a tail pipe are arranged at the two ends of the screw pump stator respectively, a screw pump rotor is arranged in the screw pump stator in a penetrating mode, and the transition oil pipe is connected with the tail pipe. The two ends of the screw pump rotor extend into the transition oil pipe and the tail pipe correspondingly, and a plurality of S-shaped closed cavities are formed between the screw pump stator and the screw pump rotor. Preferably, the end portion of the tail pipe is sleeved with a limiting stopper reducer union, a limiting stopper baffle is arranged between the limiting stopper reducer union and the end portion of the tail pipe, the limiting stopper baffle is welded to the limiting stopper reducer union, and the tail pipe is in threaded connection with the limiting stopper reducer union. The scheme has the advantages of large discharge capacity and high lift, the liquid production capacity of a single well is greatly improved, and the discharge capacity of the pump is increased; the mechanical power of the oil pumping screw pump is fully utilized, and the oil extraction cost is effectively reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of ground-driven screw oil pumps, in particular to a large-displacement and high-lift screw pump. Background Art

[0002] In recent years, ground-driven screw pumps have been widely used and play an important role in crude oil production in oil fields. They are widely used in the production of crude oil with high viscosity, high sand content, and high oil-gas ratio. They are not only used in the production of crude oil in oil fields, but also in the production and drainage of coalbed methane horizontal wells with water as the medium. They have the characteristics of low one-time investment, high oil production efficiency, low energy consumption, simple structure, and easy operation, installation and maintenance.

[0003] At present, many ultra-large displacement and high-lift oil wells have been using energy-intensive submersible pumps to pump oil. Submersible pumps are called electric tigers and consume a lot of energy. Therefore, it is imperative to develop a screw pump with low energy consumption, large displacement and high lift to replace the electric tiger submersible pump. Utility Model Content

[0004] The utility model aims to provide a large-displacement and high-lift screw pump to solve the problems in the above-mentioned background technology.

[0005] To achieve the above-mentioned objectives, the present invention provides the following technical solution: a large-displacement, high-lift screw pump, comprising a screw pump stator, wherein a transition oil pipe and a tail pipe are respectively provided at both ends of the screw pump stator, a screw pump rotor is passed through the interior of the screw pump stator, and the two ends of the screw pump rotor respectively extend into the interior of the transition oil pipe and the tail pipe, and a plurality of S-shaped closed cavities are provided between the screw pump stator and the screw pump rotor.

[0006] Preferably, a rotor reducing coupling is provided at one end of the screw pump rotor located inside the transition oil pipe.

[0007] Preferably, the end of the tail pipe is sleeved with a limiter reducer, a limiter baffle is provided between the limiter reducer and the end of the tail pipe, the limiter baffle is welded to the limiter reducer, and the tail pipe is threadedly connected to the limiter reducer.

[0008] Preferably, a first oil pipe coupling is provided between the transition oil pipe and the stator of the screw pump, and a second oil pipe coupling is provided between the tail pipe and the stator of the screw pump.

[0009] Preferably, the screw pump stator is a double-headed helical inner cavity, and the screw pump rotor is a single-headed screw.

[0010] Preferably, one end of the screw pump rotor is connected to a driving device.

[0011] Preferably, the screw pump stator has two heads, the screw pump rotor has one head, and the screw pump stator and the screw pump rotor are coupled via a helical line with a difference in the number of heads.

[0012] The utility model has at least the following beneficial effects:

[0013] The large-displacement and high-lift screw pump provided by the utility model has the advantages of large displacement and high lift, greatly improving the liquid production of a single well and increasing the displacement of the pump; fully utilizing the mechanical power of the oil pumping screw pump, and effectively reducing the oil production cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic diagram of the internal structure of the utility model;

[0015] Figure 2 This is a schematic diagram of the cross-section structure of the screw pump rotor and the screw pump stator in the utility model.

[0016] In the accompanying drawings: 1. transition oil pipe; 2. rotor reducer; 3. first oil pipe coupling; 4. screw pump stator; 5. screw pump rotor; 6. second oil pipe coupling; 7. tail pipe; 8. limiter baffle; 9. limiter reducer joint. DETAILED DESCRIPTION

[0017] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0018] Example

[0019] See also Figure 1 and Figure 2 The utility model provides a technical solution: a large-displacement and high-lift screw pump, comprising a screw pump stator 4, with a transition oil pipe 1 and a tail pipe 7 provided at both ends thereof, a screw pump rotor 5 passing through the interior of the screw pump stator 4, with both ends of the screw pump rotor 5 extending into the interior of the transition oil pipe 1 and the tail pipe 7 respectively, and a plurality of S-shaped closed cavities being provided between the screw pump stator 4 and the screw pump rotor 5;

[0020] A rotor reducer 2 is provided at one end of the screw pump rotor 5 located inside the transition oil pipe 1; a limiter reducer 9 is sleeved on the end of the tail pipe 7, a limiter baffle 8 is provided between the limiter reducer 9 and the end of the tail pipe 7, the limiter baffle 8 is welded to the limiter reducer 9, and the tail pipe 7 is threadedly connected to the limiter reducer 9; a first oil pipe coupling 3 is provided between the transition oil pipe 1 and the screw pump stator 4, and a second oil pipe coupling 6 is provided between the tail pipe 7 and the screw pump stator 4.

[0021] The screw pump stator 4 is a double-headed helical inner cavity, and the screw pump rotor 5 is a single-headed screw; one end of the screw pump rotor 5 is connected to a driving device, specifically, the driving device can be a motor, and the screw pump rotor 5 is connected to the drive shaft of the motor; the screw pump stator 4 has two heads, and the screw pump rotor 5 has one head, and the screw pump stator 4 and the screw pump rotor 5 are coupled through a helical line with a difference in the number of heads.

[0022] The working principle and usage process of the utility model: After the utility model is installed, the driving device provides a power source for the screw pump during operation: the driving device drives the screw pump rotor 5 of the downhole screw pump to move in the screw pump stator 4 through the transmission shaft, and the "S"-shaped cavity between the screw pump rotor 5 and the screw pump stator 4 spirally rises uninterruptedly along the rotating surface of the screw pump rotor 5, and the liquid is sucked in by the newly formed cavity under the pump, and is discharged at the pump end through the spiral lifting of the screw pump rotor 5, thereby achieving the purpose of uninterrupted continuous oil production.

[0023] The large-displacement, high-lift screw pump provided by this utility model has the advantages of large displacement and high lift, significantly increasing the liquid production of a single well and increasing the pump's displacement. It fully utilizes the mechanical power of the oil pump, effectively reducing oil production costs. Furthermore, an internal suction and discharge valve can be installed to prevent sand sticking and gas lock.

[0024] The above shows and describes the basic principles, main features and advantages of the present invention. For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic features of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is limited by the appended claims rather than the above description. Therefore, it is intended that all changes that fall within the meaning and scope of the equivalent elements of the claims are included in the present invention, and any figure marks in the claims should not be regarded as limiting the claims involved.

[0025] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. Large displacement and high lift screw pump, characterized by: The invention comprises a screw pump stator (4), wherein the two ends of the screw pump stator (4) are respectively provided with a transition oil pipe (1) and a tail pipe (7), a screw pump rotor (5) is penetrated inside the screw pump stator (4), and the two ends of the screw pump rotor (5) respectively extend to the interior of the transition oil pipe (1) and the tail pipe (7), and a plurality of S-shaped closed cavities are provided between the screw pump stator (4) and the screw pump rotor (5); the screw pump stator (4) is a double-headed helical inner cavity, and the screw pump rotor (5) is a single-headed screw.

2. The large-displacement, high-lift screw pump according to claim 1, characterized in that: One end of the screw pump rotor (5) located inside the transition oil pipe (1) is provided with a rotor diameter reducing coupling (2).

3. The large-displacement, high-lift screw pump according to claim 2, characterized in that: The end of the tail pipe (7) is sleeved with a limiter reducer (9), a limiter baffle (8) is provided between the limiter reducer (9) and the end of the tail pipe (7), the limiter baffle (8) and the limiter reducer (9) are welded, and the tail pipe (7) and the limiter reducer (9) are threadedly connected.

4. The large-displacement, high-lift screw pump according to claim 3, characterized in that: A first oil pipe coupling (3) is provided between the transition oil pipe (1) and the screw pump stator (4), and a second oil pipe coupling (6) is provided between the tail pipe (7) and the screw pump stator (4).

5. The large-displacement, high-lift screw pump according to claim 4, characterized in that: One end of the screw pump rotor (5) is connected to a driving device.

6. The large-displacement, high-lift screw pump according to claim 5, characterized in that: The screw pump stator (4) has two heads, the screw pump rotor (5) has one head, and the screw pump stator (4) and the screw pump rotor (5) are coupled via a helical line with a difference in the number of heads.

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