Permanent magnet bidirectional oil production plunger pump

Abstract

The utility model discloses a permanent magnet two-way oil extraction plunger pump which comprises a non-magnetic isolation sleeve, a driving permanent magnet sleeve, a driven permanent magnet sleeve, an upper pump plunger, a hollow connecting rod, a lower pump plunger and a lower pump cylinder. The lower portion of an inner cavity of the lower pump cylinder is communicated with well liquid through a lower pump cylinder bottom valve, and the upper portion of the inner cavity of the lower pump cylinder is communicated with the lower portion of an inner cavity of a lower pump plunger through a lower pump plunger ball valve and communicated with the lower portion of an inner cavity of a passive permanent magnet sleeve through a hollow connecting rod inner cavity and a passive permanent magnet sleeve bottom valve. The upper portion of an inner cavity of the passive permanent magnet sleeve is communicated with the lower portion of an inner cavity of an upper pump plunger through an upper pump plunger ball valve, and the upper portion of the inner cavity of the upper pump plunger is communicated with a well liquid outlet. By the adoption of the structure, the working temperature of the device is reduced, due to the fact that high-strength magnetic force exists in the device, well fluid can be magnetized, the viscosity is reduced, the fluidity is good, and the wax precipitation speed is reduced. Meanwhile, as the well fluid inlet is formed in the lowest end of the pump, traditional sand-proof and gas-proof tools can be adopted.

Description

TECHNICAL FIELD

[0001] The utility model belongs to oilfield oil extraction device technical field relates to a kind of permanent-magnetic two-way oil extraction plunger pump. BACKGROUND

[0002] Currently, the plunger pump of traditional beam pumping unit oil extraction is one-way oil extraction, which is not suitable for rodless reciprocating oil extraction. The existing rodless reciprocating oil extraction system also uses one-way plunger pump. The structure requires that the power system must be able to complete the lifting force of the pump when ascending. When descending, it is basically idle, which causes low efficiency of the power system and limited lifting force. Considering the application occasion, it is difficult to meet the actual demand. INVENTION CONTENTS

[0003] The utility model aims to provide a kind of permanent-magnetic two-way oil extraction plunger pump with simple structure, ingenious design, which can effectively overcome the shortcomings of existing one-way oil extraction plunger pump, greatly meet the actual demand.

[0004] The technical scheme adopted by the utility model is as follows: the plunger pump comprises a non-magnetic isolation sleeve, a driving permanent magnet sleeve, a passive permanent magnet sleeve, an upper pump plunger, a hollow connecting rod, a lower pump plunger and a lower pump barrel, and has the following characteristics:

[0005] The driving permanent magnet sleeve connected with the transmission device is sleeved outside the non-magnetic isolation sleeve; the passive permanent magnet sleeve is arranged in the inner cavity of the non-magnetic isolation sleeve, and the outer wall thereof can slide along the inner wall of the non-magnetic isolation sleeve; the lower part of the passive permanent magnet sleeve is provided with a passive permanent magnet sleeve bottom valve;

[0006] The upper part of the upper pump plunger is fixed on the inner wall of the non-magnetic isolation sleeve, and the middle part of the lower part is inserted into the inner cavity of the passive permanent magnet sleeve; the inner wall of the passive permanent magnet sleeve can slide along the outer wall of the upper pump plunger; the lower part of the upper pump plunger is provided with an upper pump plunger ball valve;

[0007] The upper end of the lower pump barrel is fixed on the lower end of the non-magnetic isolation sleeve, and the lower part thereof is provided with a lower pump barrel bottom valve;

[0008] The lower pump plunger is arranged in the inner cavity of the lower pump barrel and can slide along the inner wall of the lower pump barrel; the lower part of the lower pump plunger is provided with a lower pump plunger ball valve, and the upper end thereof is connected with the passive permanent magnet sleeve through the hollow connecting rod;

[0009] The lower part of the inner cavity of the lower pump barrel is communicated with the well fluid through the lower pump barrel bottom valve; the upper part of the inner cavity of the lower pump barrel is communicated with the lower part of the inner cavity of the lower pump plunger through the lower pump plunger ball valve; the upper part of the inner cavity of the lower pump plunger is communicated with the lower part of the inner cavity of the passive permanent magnet sleeve through the inner cavity of the hollow connecting rod and the passive permanent magnet sleeve bottom valve; the upper part of the inner cavity of the passive permanent magnet sleeve is communicated with the lower part of the inner cavity of the upper pump plunger through the upper pump plunger ball valve; and the upper part of the inner cavity of the upper pump plunger is communicated with the well fluid outlet.

[0010] In use, the utility model is placed in well fluid, drive the initiative permanent magnetic cover to go up and down reciprocating motion through transmission device, the magnetic field of initiative permanent magnetic cover in reciprocating motion is transmitted to passive permanent magnetic cover through non-magnetic isolation cover, passive permanent magnetic cover also goes up and down reciprocating motion under the action of magnetic field. Meanwhile, passive permanent magnetic cover also drive passive permanent magnetic cover bottom valve, hollow connecting rod, lower pump plunger and lower pump plunger ball valve to carry out reciprocating motion synchronously.

[0011] Since the utility model exploitation's well fluid all is from the device lower part and enters, through the device center, finally from the device top production, the approximate flow is: well fluid passes through lower pump cylinder bottom valve-lower pump cylinder-lower pump plunger ball valve-lower pump plunger-hollow connecting rod-passive permanent magnetic cover bottom valve-passive permanent magnetic cover-upper pump plunger valve ball-upper pump plunger finally discharge.

[0012] Adopt this kind of structure, not only reduce the equipment operating temperature, and because equipment inside has high strength magnetic force, well fluid will be magnetized treatment, reduce the viscosity, good flowability, wax speed slows down. At the same time, since well fluid entrance is in the lowermost end of pump, the traditional sandproof gas tool can all be used. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 It is the structural schematic diagram of the utility model;

[0014] Figure 2 It is Figure 1 the local enlarged view.

[0015] In the drawing: 1-non-magnetic isolation cover;2-initiative permanent magnetic cover;3-passive permanent magnetic cover;4-upper pump plunger;5-upper pump plunger ball valve;6-passive permanent magnetic cover bottom valve;7-hollow connecting rod;8-lower pump plunger;9-lower pump cylinder;10-lower pump plunger ball valve;11-lower pump cylinder bottom valve;D-upper plunger inner cavity area;D-lower pump plunger inner cavity area. DETAILED DESCRIPTION

[0016] As shown in the figure, the utility model includes non-magnetic isolation cover 1, initiative permanent magnetic cover 2, passive permanent magnetic cover 3, upper pump plunger 4, hollow connecting rod 7, lower pump plunger 8 and lower pump cylinder 9.

[0017] Initiative permanent magnetic cover 2 of transmission device connection is installed on the outside of non-magnetic isolation cover 1;Passive permanent magnetic cover 3 is placed in the inner cavity of non-magnetic isolation cover 1, and its outer wall can slide along the inner wall of non-magnetic isolation cover 1, and the lower part of passive permanent magnetic cover 3 is provided with passive permanent magnetic cover bottom valve 6.

[0018] Upper pump plunger 4 is fixed on the inner wall of non-magnetic isolation cover 1, and the lower middle part is inserted into the inner cavity of passive permanent magnetic cover 3;The inner wall of passive permanent magnetic cover 3 can slide along the outer wall of upper pump plunger 4, and the lower part of upper pump plunger 4 is provided with upper pump plunger ball valve 5.

[0019] The lower end of the lower pump cylinder 9 is fixed at the lower end of the non-magnetic isolation sleeve 1, and the lower part is provided with a lower pump cylinder bottom valve 11.

[0020] The lower pump plunger 8 is arranged in the inner cavity of the lower pump cylinder 9 and can slide along the inner wall of the lower pump cylinder 9; the lower part of the lower pump plunger 8 is provided with a lower pump plunger ball valve 10, and the upper end is connected with the passive permanent magnetic sleeve 3 through the hollow connecting rod 7.

[0021] The lower part of the inner cavity of the lower pump cylinder 9 is communicated with well fluid through the lower pump cylinder bottom valve 11, the upper part of the inner cavity of the lower pump cylinder 9 is communicated with the lower part of the inner cavity of the lower pump plunger 8 through the lower pump plunger ball valve 10, the upper part of the inner cavity of the lower pump plunger 8 is communicated with the lower part of the inner cavity of the passive permanent magnetic sleeve 3 through the inner cavity of the hollow connecting rod 7 and the passive permanent magnetic sleeve bottom valve 6, the upper part of the inner cavity of the passive permanent magnetic sleeve 3 is communicated with the lower part of the inner cavity of the upper pump plunger 4 through the upper pump plunger ball valve 5, and the upper part of the inner cavity of the upper pump plunger 4 is communicated with the well fluid outlet.

[0022] As shown in Figure 2 the lower pump plunger inner cavity area D is 2 times of the upper pump plunger inner cavity area d. Meanwhile, under the action of the upper pump plunger ball valve 5, the passive permanent magnetic sleeve bottom valve 6, the lower pump plunger ball valve 10 and the lower pump bottom valve 11, the device is bidirectional moving, so that the device also has the function of bidirectional oil extraction, not only reduces the equipment vibration, but also the lifting force is more than 2 times of the same device. Compared with the existing one-way oil extraction plunger pump, the motor power is reduced by 2 times under the condition that the pump diameter and pump hanging depth are the same, and the lifting force is increased by 2 times under the condition that the motor power and pump diameter are the same.

[0023] The specific working process of the utility model is as follows:

[0024] First, the utility model moves upward:

[0025] When the oil extraction system performs upstroke operation, the active permanent magnetic sleeve 2, the passive permanent magnetic sleeve 3, the passive permanent magnetic sleeve bottom valve 6, the lower pump plunger 8 and the lower pump plunger ball valve 10 are all at the lower dead point.

[0026] At this time, the distance between the upper pump plunger ball valve 5 and the passive permanent magnetic sleeve bottom valve 6 is the largest, and the distance between the lower pump plunger ball valve 10 and the lower pump cylinder bottom valve 11 is the smallest.

[0027] The driving device drives the active permanent magnetic sleeve 2 to move upward, and at the same time, the passive permanent magnetic sleeve 3, the passive permanent magnetic sleeve bottom valve 6, the lower pump plunger 8 and the lower pump plunger ball valve 10 move upward together.

[0028] In the upward movement process, the passive permanent magnetic sleeve bottom valve 6 and the lower pump plunger ball valve 10 are closed, the upper pump plunger ball valve 5 and the lower pump cylinder bottom valve 11 are opened, and the non-magnetic isolation sleeve 1, the upper pump plunger 4 and the lower pump cylinder 9 remain unchanged.

[0029] In the upward movement process, the distance between the upper pump plunger ball valve 5 and the passive permanent magnetic sleeve bottom valve 6 is shortened, and the well fluid between the two is discharged through the upper pump plunger 4.

[0030] In the upstroke process, the well fluid between the passive permanent sleeve bottom valve 6 and the lower pump plunger ball valve 10 remains unchanged.

[0031] In the upstroke process, the distance between the lower pump plunger ball valve 10 and the lower pump cylinder bottom valve 11 gradually increases, and the well fluid enters between them through the lower pump cylinder bottom valve 11.

[0032] Since the inner cavity area D of the lower pump plunger is twice the inner cavity area d of the upper pump plunger. (See Figure 2 Therefore, in the upstroke process, the volume of the liquid entering through the lower pump plunger 8 is twice the volume of the liquid discharged by the upper pump plunger 4, until the upstroke ends.

[0033] Second, the utility model moves downward:

[0034] When the oil production system performs downstroke operation, the active permanent sleeve 2, the passive permanent sleeve 3, the passive permanent sleeve bottom valve 6, the lower pump plunger 8 and the lower pump plunger ball valve 10 are all at the upper dead point.

[0035] At this time, the distance between the upper pump plunger ball valve 5 and the passive permanent sleeve bottom valve 6 is the smallest; the distance between the lower pump plunger ball valve 10 and the lower pump cylinder bottom valve 11 is the largest.

[0036] The transmission device drives the active permanent sleeve 2 to move downward, and at the same time, the passive permanent sleeve 3, the passive permanent sleeve bottom valve 6, the lower pump plunger 8 and the lower pump plunger ball valve 10 move downward together.

[0037] In the downstroke process, the passive permanent sleeve bottom valve 6, the lower pump plunger ball valve 10 and the upper pump plunger ball valve 5 are opened, the lower pump cylinder bottom valve 11 is closed, and the non-magnetic isolation sleeve 1, the upper pump plunger 4 and the lower pump cylinder 9 remain unchanged.

[0038] In the downstroke process, the distance between the upper pump plunger ball valve 5 and the passive permanent sleeve bottom valve 6 increases, and the well fluid between them is supplemented through the lower pump plunger 8.

[0039] In the downstroke process, the well fluid between the passive permanent sleeve bottom valve 6 and the lower pump plunger ball valve 10 moves upward.

[0040] In the downstroke process, the distance between the lower pump plunger ball valve 10 and the lower pump cylinder bottom valve 11 gradually decreases, and the well fluid between them is discharged through the lower pump plunger ball valve 10, until it is discharged through the upper pump plunger 4.

[0041] Since the inner cavity area D of the lower pump plunger is twice the inner cavity area d of the upper pump plunger. (See Figure 2 Therefore, in the downstroke process, the volume of the liquid discharged through the lower pump plunger 8 is twice the volume of the liquid discharged by the upper pump plunger 4, of which 50% is supplemented to the upper pump plunger 4, and the remaining 50% is discharged through the upper pump plunger 4, until the downstroke ends.

Claims

1. A permanent magnetic bidirectional oil production plunger pump, comprising a non-magnetic isolation sleeve (1), a driving permanent magnetic sleeve (2), a driven permanent magnetic sleeve (3), an upper pump plunger (4), a hollow connecting rod (7), a lower pump plunger (8) and a lower pump cylinder (9), characterized in that: the driving permanent magnetic sleeve (2) connected with a transmission device is sleeved outside the non-magnetic isolation sleeve (1); the driven permanent magnetic sleeve (3) is arranged in the inner cavity of the non-magnetic isolation sleeve (1), and the outer wall of the driven permanent magnetic sleeve (3) is slidable along the inner wall of the non-magnetic isolation sleeve (1), and the lower part of the driven permanent magnetic sleeve (3) is provided with a driven permanent magnetic sleeve bottom valve (6); the upper part of the upper pump plunger (4) is fixed on the inner wall of the non-magnetic isolation sleeve (1), and the lower middle part of the upper pump plunger (4) is inserted into the inner cavity of the driven permanent magnetic sleeve (3); the inner wall of the driven permanent magnetic sleeve (3) is slidable along the outer wall of the upper pump plunger (4), and the lower part of the upper pump plunger (4) is provided with an upper pump plunger ball valve (5); the upper end of the lower pump cylinder (9) is fixed on the lower end of the non-magnetic isolation sleeve (1), and the lower part of the lower pump cylinder (9) is provided with a lower pump cylinder bottom valve (11); the lower pump plunger (8) is arranged in the inner cavity of the lower pump cylinder (9) and is slidable along the inner wall of the lower pump cylinder (9); the lower part of the lower pump plunger (8) is provided with a lower pump plunger ball valve (10), and the upper end of the lower pump plunger (8) is connected with the driven permanent magnetic sleeve (3) through the hollow connecting rod (7); the lower part of the inner cavity of the lower pump cylinder (9) is communicated with well fluid through the lower pump cylinder bottom valve (11), the upper part of the inner cavity of the lower pump cylinder (9) is communicated with the lower part of the inner cavity of the lower pump plunger (8) through the lower pump plunger ball valve (10), the upper part of the inner cavity of the lower pump plunger (8) is communicated with the lower part of the inner cavity of the driven permanent magnetic sleeve (3) through the inner cavity of the hollow connecting rod (7) and the driven permanent magnetic sleeve bottom valve (6), the upper part of the inner cavity of the driven permanent magnetic sleeve (3) is communicated with the lower part of the inner cavity of the upper pump plunger (4) through the upper pump plunger ball valve (5), and the upper part of the inner cavity of the upper pump plunger (4) is communicated with a well fluid outlet. The inner cavity area (D) of the lower pump plunger is 2 times of the inner cavity area (d) of the upper pump plunger. ​ ​ ​ ​ 2. The permanent-magnetic bidirectional oil-recovery plunger pump according to claim 1, characterized in that: ​

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