Self-control liquid drainage type environment-friendly sand prevention oil well pump

Abstract

The invention discloses a self-control liquid drainage type environment-friendly sand prevention oil well pump which comprises a pump cylinder assembly, a plunger assembly, an outer pipe assembly, a fixed valve assembly and a liquid drainage valve assembly. The pump cylinder assembly comprises a pump cylinder, and the length of the pump cylinder is L1; the plunger assembly comprises a plunger, the length of the plunger assembly is L, and the length of the plunger is L2; the outer pipe assembly comprises an outer pipe, and the length of the outer pipe is L3; the liquid discharge valve assembly is fixed on the pump cylinder, and the liquid discharge valve assembly is fixed on the pump cylinder; the hydraulic pump is characterized in that when the plunger assembly is lifted upwards to enable the plunger to be separated from the pump cylinder, the liquid discharge valve assembly is in an open state, and at the moment, communication between a rod pipe annulus and an oil sleeve annulus can be achieved. After the liquid drainage device is applied, the liquid drainage task can be completed without damaging the liquid drainage valve assembly.

Description

Technical Field

[0001] This invention relates to an oil pump for oil well extraction, specifically to a self-controlled drainage type environmentally friendly sand-proof oil pump. Background Technology

[0002] The prior art discloses a utility model patent entitled "Self-controlled Drainage Type High-efficiency Environmentally Friendly Sand-proof Oil Pump", with application number CN202322509352.7. The technical solution of this patent mainly includes a pump barrel assembly, a plunger assembly, an outer tube assembly, a fixed valve assembly, and a drain valve assembly. The pump barrel assembly includes an upper pump barrel connector, a pump barrel, and a lower pump barrel connector, with the length of the pump barrel being L1. The plunger assembly includes an upper oil outlet connector, a closed valve cover, a traveling valve ball, a traveling valve seat, a valve seat connector, a plunger, and a valve seat plug, with the length of the plunger assembly being L and the length of the plunger being L2. The outer tube assembly includes an outer tube and a coupling, with the length of the outer tube being L3. The drain valve assembly is located in the middle of the pump barrel, where L2 > L1 and L1 / 2 + L3 > L. When the plunger assembly falls and impacts the drain valve assembly, it falls into the outer tube, thus achieving communication between the rod tube annulus and the oil sleeve annulus.

[0003] The aforementioned prior art pump barrel self-controlled drainage type high-efficiency environmentally friendly sand-proof oil pump includes a valve core extending into the pump barrel in its drainage valve assembly. The valve core has a drainage hole, and the drainage function is achieved by the plunger assembly falling and breaking the valve core. The main problem with the aforementioned prior art pump barrel self-controlled drainage type high-efficiency environmentally friendly sand-proof oil pump is that when the plunger assembly falls, it can break the valve core, thereby achieving the purpose of drainage. That is, drainage is accomplished by destroying the drainage valve assembly. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a self-controlled, environmentally friendly, sand-proof oil pump that can complete the drainage task without damaging the drainage valve assembly.

[0005] To solve the above-mentioned technical problems, the present invention provides a self-controlled draining environmentally friendly sand-proof oil pump, comprising a pump barrel assembly, a plunger assembly, an outer pipe assembly, a fixed valve assembly, and a drain valve assembly; the pump barrel assembly includes a pump barrel with a length of L1; the plunger assembly includes a plunger with a length of L and a plunger length of L2; the outer pipe assembly includes an outer pipe with a length of L3; the drain valve assembly is fixed on the pump barrel, wherein L2 > L1, characterized in that: when the plunger assembly is lifted to disengage the plunger from the pump barrel, the drain valve assembly is in an open state, at which time the rod tube annulus and the oil sleeve annulus can be connected.

[0006] Furthermore, the drain valve assembly is located in the middle of the pump barrel, wherein L1 / 2 + L3 > L, and when the plunger assembly slides down into the outer tube, the rod tube annulus and the oil sleeve annulus can be connected.

[0007] Furthermore, guide plates are fixed on the pump cylinders on both sides of the drain valve assembly to prevent the drain valve assembly from jamming and being damaged.

[0008] Furthermore, the drain valve assembly includes a valve body, a valve ball, and a drain connector; the valve body has a first inlet channel and a second inlet channel whose axes are perpendicular to and interconnected; one end of the drain connector is threaded to one end of the valve body, and the other end of the drain connector has a first drain hole; the drain connector has a valve ball channel with both ends connected to the second inlet channel and the first drain hole respectively; and second drain holes connected to the valve ball channel are evenly distributed along the circumference of the drain connector outside the first drain hole. The axes of the first drain hole, the valve ball channel, and the second inlet channel are all on the same straight line. The inner diameters of the first drain hole and the second inlet channel are equal. The inner diameter of the first drain hole is smaller than the diameter of the valve ball, and the diameter of the valve ball is smaller than the inner diameter of the valve ball channel. When the valve ball rises, it can seal with the opening of the second inlet channel. When the valve ball falls, it can fall into the opening of the first drain hole. The valve body is welded and fixed to the pump barrel. Correspondingly, the pump barrel is provided with a drain hole that communicates with the first inlet channel on the valve body.

[0009] The present invention has the following beneficial technical effects: 1. Because the present invention changes the structure of the traditional drain valve assembly, when the plunger assembly is lifted until the plunger is disengaged from the pump barrel, the valve ball falls and can fall to the orifice of the first drain hole. At this time, the well fluid can enter the tubing annulus through the drain hole, the first inlet channel, the second inlet channel, the valve ball channel, and the first and second drain holes, thus completing the draining task without damaging the drain valve assembly; 2. When the drain valve assembly is located in the middle of the pump barrel and L1 / 2 + L3 > L, the plunger assembly can slide down and completely enter the outer tube, thus achieving communication between the tubing annulus and the tubing annulus; 3. After the guide plates for preventing the drain valve assembly from jamming and being damaged are fixed on the pump barrels on both sides of the drain valve assembly, the friction between the pump barrel and the tubing during the installation of the oil pump can be prevented from causing jamming and damage to the drain valve assembly. Attached Figure Description

[0010] The present invention will now be described in further detail with reference to the accompanying drawings.

[0011] Figure 1 This is a cross-sectional structural schematic diagram of a self-controlled drainage type environmentally friendly sand-proof oil pump according to the present invention.

[0012] Figure 2 For easier viewing Figure 1 The angles of the structure at various points, along Figure 1 ZhongXX, YY, ZZ lines Figure 1 The diagram shows the structure of a self-controlled, high-efficiency, environmentally friendly, sand-proof oil pump with a pump barrel broken into four parts.

[0013] Figure 3 yes Figure 2 Enlarged structural schematic diagram of the drain valve assembly.

[0014] Figure 4 This is a schematic diagram of the main structure of the drain valve assembly in this invention.

[0015] Figure 5 It is along Figure 2 Enlarged cross-sectional view of line AA in the middle.

[0016] Figure 6 This is a cross-sectional view of the pump cylinder in this invention.

[0017] Figure 7 yes Figure 6 Enlarged schematic diagram of the structure at point I. Detailed Implementation

[0018] See Figure 1 - Figure 7This invention discloses a self-controlled draining environmentally friendly sand-proof oil pump, comprising a pump barrel assembly 1, a plunger assembly 2, an outer pipe assembly 3, a fixed valve assembly 4, and a drain valve assembly 5. The pump barrel assembly 1 includes an upper pump barrel connector 101, a pump barrel 102, and a lower pump barrel connector 103, with a pump barrel length of L1. The plunger assembly 2 includes an upper oil outlet connector 201, a closed valve cover 202, a moving valve ball 203, a moving valve seat 204, a valve seat connector 205, a plunger 206, and a valve seat pipe plug 207, with a plunger assembly length of L and a plunger length of L2. The outer pipe assembly 3 includes an outer pipe 301 and a coupling 302, with an outer pipe length of L3. The drain valve assembly 5 is fixed to the pump barrel 102, wherein L2> L1, characterized in that: when the plunger assembly 2 is lifted, causing the plunger 206 to disengage from the pump barrel 102, the drain valve assembly 5 is in the open state, at which time the rod tube annulus and the oil sleeve annulus can be connected. The drain valve assembly 5 is located in the middle of the pump barrel 102, wherein L1 / 2 + L3 > L, and when the plunger assembly slides down into the outer tube, the rod tube annulus and the oil sleeve annulus can be connected. Guide plates 104 are fixed on the pump barrel 102 on both sides of the drain valve assembly 5 to prevent the drain valve assembly from jamming and being damaged. The drain valve assembly 5 includes a valve body 51, a valve ball 52, and a drain connector 53; the valve body has a first inlet channel 511 and a second inlet channel 512 whose axes are perpendicular to each other and interconnected; one end of the drain connector is threaded to one end of the valve body, and the other end of the drain connector has a first drain hole 531; the drain connector has a valve ball channel 532 with both ends connected to the second inlet channel 512 and the first drain hole 531 respectively; second drain holes 533 connected to the valve ball channel are evenly distributed along the circumference of the drain connector outside the first drain hole; the first The axes of the drain hole 531, the valve ball channel 532, and the second inlet channel 512 are all located on the same straight line. The inner diameters of the first drain hole and the second inlet channel are equal. The inner diameter of the first drain hole is smaller than the diameter of the valve ball, and the diameter of the valve ball is smaller than the inner diameter of the valve ball channel. When the valve ball 52 is raised, it can seal with the opening of the second inlet channel 512. When the valve ball is lowered, it can fall into the opening of the first drain hole 531. The valve body 51 is welded and fixed to the pump barrel 102. Correspondingly, the pump barrel has a drain hole 105 that communicates with the first inlet channel 511 on the valve body. The length of the pump barrel 102 is 900 mm, 1200 mm, 1500 mm, or 1800 mm. The length of the plunger 206 is 3000 mm to 9000 mm. The inner surface of the pump barrel 102 is coated with a wear-resistant and corrosion-resistant layer 1021.

[0019] It is understood that the above specific description of the present invention is only for illustrating the present invention and is not limited to the technical solutions described in the embodiments of the present invention. Any modifications or equivalent substitutions to the present invention to achieve the same technical effect are within the protection scope of the present invention.

Claims

1. A self-controlled draining environmentally friendly sand-proof oil pump, comprising a pump barrel assembly (1), a plunger assembly (2), an outer pipe assembly (3), a fixed valve assembly (4), and a drain valve assembly (5); wherein the pump barrel assembly (1) comprises a pump barrel (102) with a length of L1; the plunger assembly (2) comprises a plunger (206) with a length of L and a plunger length of L2; the outer pipe assembly (3) comprises an outer pipe (301) with a length of L3; and the drain valve assembly (5) is fixed on the pump barrel (102), wherein L2 > L1, characterized in that: When the plunger assembly (2) is lifted up and the plunger (206) is disengaged from the pump barrel (102), the drain valve assembly (5) is in the open state, at which time the rod tube annulus and the oil sleeve annulus can be connected.

2. The self-controlled drainage type environmentally friendly sand-proof oil pump as described in claim 1, characterized in that: The drain valve assembly (5) is located in the middle of the pump barrel (102), wherein L1 / 2 + L3 > L, and when the plunger assembly slides down into the outer tube, the rod tube annulus and the oil sleeve annulus can be connected.

3. The self-controlled drainage type environmentally friendly sand-proof oil pump as described in claim 1, characterized in that: Guide plates (104) are fixed on the pump barrels (102) on both sides of the drain valve assembly (5) to prevent the drain valve assembly from jamming and being damaged.

4. The self-regulating drainage type environmentally friendly sand-proof oil pump as described in any one of claims 1-3, characterized in that: The drain valve assembly (5) includes a valve body (51), a valve ball (52), and a drain connector (53); the valve body has a first inlet channel (511) and a second inlet channel (512) whose axes are perpendicular to each other and interconnected; one end of the drain connector is threaded to one end of the valve body, and the other end of the drain connector has a first drain hole (531); the drain connector has a valve ball channel (532) with both ends connected to the second inlet channel (512) and the first drain hole (531) respectively; and second drain holes (533) connected to the valve ball channel are evenly distributed on the circumference of the drain connector outside the first drain hole. The axes of the first drain hole (531), the valve ball channel (532), and the second inlet channel (512) are all on the same straight line. The inner diameters of the first drain hole and the second inlet channel are equal. The inner diameter of the first drain hole is smaller than the diameter of the valve ball, and the diameter of the valve ball is smaller than the inner diameter of the valve ball channel. When the valve ball (52) rises, it can seal with the opening of the second inlet channel (512). When the valve ball falls, it can fall to the opening of the first drain hole (531). The valve body (51) is welded and fixed on the pump barrel (102). Correspondingly, the pump barrel is provided with a drain hole (105) that communicates with the first inlet channel (511) on the valve body.

5. The self-controlled drainage type environmentally friendly sand-proof oil pump as described in claim 1, characterized in that: The length of the pump barrel (102) is 900 mm, 1200 mm, 1500 mm or 1800 mm; the length of the plunger (206) is 3000 mm to 9000 mm.

6. The self-controlled drainage type environmentally friendly sand-proof oil pump as described in claim 1, characterized in that: The inner surface of the pump cylinder (102) is permeated with a wear-resistant and corrosion-resistant layer (1021).

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