CN117108492A - Continuous flow oil-submersible plunger pump - Google Patents

Abstract

The device for oil field mechanical oil extraction comprises an upper plunger, a middle plunger, a discharge valve, a communication mechanism, a liquid inlet valve, a lower plunger and a rotor joint which are sequentially connected, wherein the middle plunger is sleeved outside the middle plunger, the discharge valve, the communication mechanism and the liquid inlet valve, the lower plunger is sleeved outside the lower plunger, the upper part of the lower plunger is arranged at the lower part of the middle plunger, the diameter of the middle plunger is larger than that of the lower plunger, a liquid inlet cavity is formed in the middle plunger, a communication hole is formed in the communication mechanism, a balance joint is arranged at the upper part of the middle plunger, the upper plunger is sleeved outside the upper plunger, the lower part of the upper plunger is connected with the upper part of the balance joint, the diameter of the upper plunger is smaller than that of the middle plunger, a cavity is formed by the difference of the diameter between the outer wall of the upper plunger and the inner wall of the middle plunger, a balance hole is arranged on the balance joint, the balance hole is arranged below the connecting part of the upper pump and the balance joint, the balance hole is communicated with the upper part of the cavity, the lower pump is connected with the upper part of a stator of an oil motor, and the rotor is connected with the upper part of the oil motor.

Description

Continuous flow oil-submersible plunger pump

Technical Field

The invention relates to a device for mechanical oil extraction in an oil field, which is a continuous flow submersible plunger pump.

Background

In sucker rod pumping systems, whether straight or inclined, the sucker rod and the oil pipe are in relative motion in contact, so that unavoidable wear exists between the sucker rod and the oil pipe, particularly in deep wells and inclined wells, the sucker rod is easy to bend in the oil pipe, and serious problems of the sucker rod wearing the oil pipe occur. After abrasion, the oil pipe and the sucker rod cannot be used, so that oil well operation is caused, the oil well repair-free period is short, the operation cost is increased, the consumption of the rod pipe is increased, the production stopping time of the oil well is long, and the crude oil yield is reduced. In order to solve the above problems, the skilled person has developed various techniques for preventing the abrasion between the sucker rod and the oil pipe. The outstanding technology for preventing the abrasion between the sucker rod and the oil pipe is a rodless oil pump, and the technology is to put the motor underground, cancel the sucker rod and fundamentally eliminate the abrasion problem between the sucker rod and the oil pipe. One of the rodless oil pumps is a plunger pump driven by a submersible reciprocating driving device. The plunger pump driven by the conventional submersible reciprocating driving device is a common oil pump, which discharges oil in an upward direction and discharges oil in a downward direction, and the problem of the liquid discharge mode is that the liquid yield is low, and the benefit of an oil well is not maximized; on the other hand, the problem is that the submersible reciprocating driving device has different uplink and downlink output power, so that the system is unbalanced in operation and high in energy consumption.

Disclosure of Invention

The invention aims to design a continuous flow oil-submerged plunger pump, which overcomes the problems, and discharges liquid and outputs energy in the up-and-down stroke, so that the working condition is reasonable, the operation is balanced, the energy consumption of the device is reduced, and the economic benefit of an oil well is improved.

The purpose of the invention is realized in the following way: comprises an upper pump cylinder, an upper plunger, a balance joint, a middle pump cylinder, a middle plunger, a discharge valve, a communicating mechanism, a liquid inlet valve, a lower pump cylinder, a lower plunger and a rotor joint, wherein the discharge valve and the liquid inlet valve are uniflow valves, liquid flow can only flow upwards but not downwards through the uniflow valves, the upper plunger, the middle plunger, the discharge valve, the communicating mechanism, the liquid inlet valve, the lower plunger and the rotor joint are sequentially connected, the middle pump cylinder is sleeved outside the middle plunger, the discharge valve, the communicating mechanism and the liquid inlet valve, the middle pump cylinder is matched and sealed with the middle plunger, the lower pump cylinder is sleeved outside the lower plunger, the upper part of the lower pump cylinder is arranged at the lower part of the middle pump cylinder, the lower pump cylinder is matched and sealed with the lower plunger, the diameter of the middle plunger is larger than that of the lower plunger, so that the liquid in the middle pump cylinder can form a liquid inlet cavity, a communicating through hole is formed in the communicating mechanism, so that well liquid can enter the liquid inlet cavity through a channel at the lower part of the lower plunger, the liquid inlet valve and a communicating hole on the communicating mechanism, the well fluid can be discharged onto the upper plunger through a communication hole and a discharge valve on the communication mechanism in the fluid inlet cavity, a balance joint is arranged on the upper part of the middle pump barrel, the upper pump barrel is sleeved outside the upper plunger, the upper pump barrel is matched and sealed with the upper plunger, the lower part of the upper pump barrel is connected with the upper part of the balance joint, the connecting part is kept sealed, the diameter of the upper plunger is smaller than that of the middle plunger, a cavity is formed by the outer wall of the upper plunger and the inner wall of the middle pump barrel due to the diameter difference, a balance hole is formed in the balance joint, the balance hole is positioned below the connecting part of the upper pump barrel and the balance joint, the balance hole is communicated with the upper part of the cavity, the cavity is communicated with the outside of the middle pump barrel, the lower pump barrel is connected with the upper part of a stator of the submersible motor, and the rotor joint is connected with the upper part of a rotor of the submersible motor.

The beneficial effects of the invention are as follows: when the upper stroke is carried out, the discharge valve is closed, well liquid on the discharge valve can be upwards discharged, the discharge amount is the discharge amount of the oil pump consisting of the upper pump barrel and the upper plunger, when the lower stroke is carried out, the liquid inlet valve is closed, well liquid in the liquid inlet cavity is discharged, the well liquid can be discharged in both the upper stroke and the lower stroke, when the discharge amount of the liquid inlet cavity is designed to be the discharge amount of the oil pump consisting of the upper pump barrel and the upper plunger, the continuous flow liquid discharge of the equal flow amount in the upper stroke and the lower stroke can be realized, so that the same energy consumption is output in the upper stroke and the lower stroke, the working condition is reasonable, the operation is balanced, the energy consumption is low, and the economic benefit of an oil well can be improved.

Drawings

Fig. 1 is an assembly view of the present invention.

Fig. 2 is an upper half of fig. 1.

Fig. 3 is a lower half of fig. 1.

In the figure: 1 is an upper pump cylinder, 2 is an upper plunger, 3 is a balance joint, 4 is a middle pump cylinder, 5 is a middle plunger, 6 is a discharge valve, 7 is a communication mechanism, 8 is a liquid inlet valve, 9 is a lower pump cylinder, 10 is a lower plunger, and 11 is a rotor joint.

Description of the embodiments

Embodiments of the present invention will be described below with reference to the accompanying drawings.

As can be seen from the figure, the embodiment of the invention comprises an upper pump cylinder 1, an upper plunger 2, a balance joint 3, a middle pump cylinder 4, a middle plunger 5, a discharge valve 6, a communication mechanism 7, a liquid inlet valve 8, a lower pump cylinder 9, a lower plunger 10 and a rotor joint 11, wherein the discharge valve 6 and the liquid inlet valve 8 are uniflow valves, liquid flow only can flow upwards but can not flow downwards through the uniflow valves, the upper plunger 2, the middle plunger 5, the discharge valve 6, the communication mechanism 7, the liquid inlet valve 8, the lower plunger 10 and the rotor joint 11 are sequentially connected, the middle pump cylinder 4 is sleeved outside the middle plunger 5, the discharge valve 6, the communication mechanism 7 and the liquid inlet valve 8, the middle pump cylinder 4 is matched and sealed with the middle plunger 5, the lower pump cylinder 9 is sleeved outside the lower plunger 10, the upper part of the lower pump cylinder 9 is connected with the lower part of the middle pump cylinder 4, the connecting part is kept sealed, the lower pump cylinder 9 is matched and sealed with the lower plunger 10, the diameter of the middle plunger 5 is larger than that of the lower plunger 10, the lower plunger 10 is made to enter the middle pump barrel 4 to form a liquid inlet cavity 4-2 in the middle pump barrel 4, a liquid inlet hole is formed on the rotor joint 11, a communicating hole is formed on the communicating mechanism 7, well liquid can enter the liquid inlet cavity 4-2 through the liquid inlet hole on the rotor joint 11, a liquid inlet valve 8 and the communicating hole on the communicating mechanism 7, well liquid can also be discharged onto the upper plunger 2 from the liquid inlet cavity 4-2 through the communicating hole on the communicating mechanism 7 and a discharge valve 6, a balance joint 3 is arranged at the upper part of the middle pump barrel 4, the upper pump barrel 1 is sleeved outside the upper plunger 2, the upper pump barrel 1 is matched and sealed with the upper plunger 2, the lower part of the upper pump barrel 1 is connected with the upper part of the balance joint 3, the connecting part is kept sealed, the diameter of the upper plunger 2 is smaller than the diameter of the middle plunger 5, the outer wall of the upper plunger 2 and the inner wall of the middle pump barrel 4 form a cavity 4-1 due to the diameter difference, the balance joint 3 is provided with a balance hole 3-1, the balance hole 3-1 is positioned below the joint of the upper pump cylinder 1 and the balance joint 3, the balance hole 3-1 is communicated with the upper part of the cavity 4-1, the cavity 4-1 is communicated with the outside of the middle pump cylinder 4, the lower pump cylinder 9 is connected with the upper part of the stator of the submersible motor, and the rotor joint 11 is connected with the upper part of the rotor of the submersible motor.

The upper plunger 2, the middle plunger 5, the discharge valve 6, the communication mechanism 7, the liquid inlet valve 8, the lower plunger 10 and the rotor joint 11 form a movable part, the lower part of the movable part is connected with the rotor of the submersible motor, the upper pump cylinder 1, the balance joint 3, the middle pump cylinder 4 and the lower pump cylinder 9 form a fixed part, and the fixed part is connected with the stator of the submersible motor. The movable part moves along with the rotor of the submersible motor to realize oil pumping.

During the upward stroke, the discharge valve 6 is closed, the volume of the liquid inlet cavity 4-2 is increased, the pressure in the liquid inlet cavity is reduced, the liquid inlet valve 8 is opened, well liquid enters the liquid inlet cavity 4-2, and during the upward stroke, the liquid inlet above the discharge valve 6 is lifted (discharged) upwards, and the lifting amount is the cross section area of the upper plunger multiplied by the stroke length. During the down stroke, the liquid inlet valve 8 is closed, the volume of the liquid inlet cavity 4-2 is reduced, the pressure is increased, the discharge valve 6 is opened, and the well liquid in the liquid inlet cavity 4-2 is discharged. The upward stroke liquid discharge and the downward stroke liquid discharge are immediately followed, so that continuous liquid discharge is realized, the liquid discharge amounts of the upward stroke and the downward stroke are designed to be the same, and the aim of the invention that the output energy consumption of the upward stroke and the downward stroke is the same can be realized (the submersible motor needs to generate upward thrust in the upward stroke process and downward thrust in the downward stroke process). The liquid discharge amounts of the upper stroke and the lower stroke are designed to be the same and realized by the combination of the upper pump cylinder 1, the middle pump cylinder 4 and the lower pump cylinder 9.

Submersible, in the petroleum industry, refers to motors and other components below the surface of a subsurface, i.e., the powered portion, submerged in the well fluid.

The communication mechanism 7 is provided with a centering device, so that the matching power of the plunger in the pump barrel is facilitated, and the centering rod of the centering device is of a solid structure, so that the communication mechanism 7 is provided with two communication holes, and if the centering device is not arranged, only one communication hole is needed.

The connection part of the upper pump cylinder 1 and the balance joint 3 is also provided with a centering device, so that the upper pump cylinder 1 and the upper plunger 2 can be prevented from being eccentric.

Claims (1)

1. The utility model provides a continuous flow oil-submerged plunger pump, includes pump cylinder (1), goes up plunger (2), balanced joint (3), well pump cylinder (4), well plunger (5), discharge valve (6), link gear (7), feed liquor valve (8), lower pump cylinder (9), plunger (10) down, active cell joint (11), discharge valve (6), feed liquor valve (8) are the uniflow valve, and the liquid stream can only upwards flow through it, can not flow down through it, characterized by: the upper plunger (2), the middle plunger (5), the discharge valve (6), the communicating mechanism (7), the liquid inlet valve (8), the lower plunger (10) and the rotor joint (11) are sequentially connected, the middle pump barrel (4) is sleeved outside the middle plunger (5), the discharge valve (6), the communicating mechanism (7) and the liquid inlet valve (8), the middle pump barrel (4) is matched and sealed with the middle plunger (5), the lower pump barrel (9) is sleeved outside the lower plunger (10), the upper part of the lower pump barrel (9) is arranged at the lower part of the middle pump barrel (4), the lower pump barrel (9) is matched and sealed with the lower plunger (10), the diameter of the middle plunger (5) is larger than the diameter of the lower plunger (10), so that a liquid inlet cavity (4-2) is formed in the middle pump barrel (4), the communicating mechanism (7) is provided with a communication hole, so that well liquid can enter the liquid inlet cavity (4-2) through a channel at the lower part of the lower plunger (10), the liquid inlet valve (8) and a hole on the mechanism (7) is communicated with the liquid inlet cavity (4-2), the liquid can also be discharged from the upper pump barrel (4) through the upper part (4) to the upper part (2) of the upper plunger (4), the upper pump cylinder (1) is sealed with the upper plunger (2) in a matched manner, the lower part of the upper pump cylinder (1) is connected with the upper part of the balance joint (3), the joint is kept sealed, the diameter of the upper plunger (2) is smaller than that of the middle plunger (5), a cavity (4-1) is formed by the outer wall of the upper plunger (2) and the inner wall of the middle pump cylinder (4) due to the diameter difference, the balance joint (3) is provided with the balance hole (3-1), the balance hole (3-1) is positioned below the joint of the upper pump cylinder (1) and the balance joint (3), the balance hole (3-1) is communicated with the upper part of the cavity (4-1), the cavity (4-1) is communicated with the outer part of the middle pump cylinder (4), the lower pump cylinder (9) is connected with the upper part of a stator of the submersible motor, and the rotor joint (11) is connected with the upper part of the rotor of the submersible motor.