Horizontal oil well pump

Abstract

A center pull rod is assembled in an upper pump cylinder, a center pull rod upper connector is installed at the top of the center pull rod and connected with an oil pumping pipe, an annular valve is arranged in the middle of the center pull rod, and an upper plunger is assembled at the position, between the center pull rod upper connector and the annular valve, of the inner side of the upper pump cylinder. The bottom of the upper plunger is provided with an annular valve seat matched with the annular valve, the lower portion of the annular valve is connected with a lower plunger through a plunger connector, the lower plunger is sleeved with a liquid inlet sealing cylinder, the liquid inlet sealing cylinder is sleeved with a liquid inlet sealing connecting pipe, the liquid inlet sealing connecting pipe is communicated with the bottom of the upper pump cylinder, and the liquid inlet sealing cylinder can move up and down in the liquid inlet sealing connecting pipe. The bottom of the liquid inlet sealing cylinder is connected with a fixing ring valve, a fixing valve seat matched with the fixing ring valve is arranged below the fixing ring valve, the fixing valve seat is fixedly connected with the inner wall of the liquid inlet sealing connecting pipe, and the technical problem that in the oil pumping process of highly-deviated well development, eccentric wear is easily caused or opening and closing lag exists, and consequently the pump efficiency is low is solved.

Description

Technical Field

[0001] The invention belongs to the technical field of oil and gas collection, and in particular relates to a horizontal oil well pump. Background Art

[0002] At present, domestic directional wells, cluster wells, horizontal wells generally use beam pumping systems and rodless pumping systems for oil production. The rodless oil production system mainly includes electric submersible pump production, downhole linear motor oil production system, downhole drive screw pump, gas lift and various systems. The system is divided into hydraulic piston pump production, jet pump production, hydraulic lift deep well pump production system, etc. Conventional deep well pump systems can only adapt to oil wells with an inclination of less than 60°. When the inclination is greater than 60°, the rod and pipe wear leads to a short pump inspection cycle and high cost. The hydraulic lift deep well pump production system has no sucker rod and can be used in high-angle wells. However, since ordinary deep well pump valves have opening and closing lag problems in high-angle wells, the pump efficiency is low, so it is not suitable for oil production in high-angle wells. Summary of the invention

[0003] The object of the present invention is to provide a horizontal oil pump to solve the technical problems in the prior art that the pumping process of highly deviated wells is prone to eccentric wear or opening and closing delays, resulting in low pump efficiency.

[0004] The technical solution adopted by the present invention to solve its technical problem is: A horizontal oil pump comprises: an upper pump barrel, a center pull rod is assembled in the upper pump barrel, a center pull rod upper joint is installed on the top of the center pull rod, the center pull rod upper joint is connected to the oil pumping pipe, an annular valve is provided in the middle of the center pull rod, an upper plunger is assembled on the inner side of the upper pump barrel between the center pull rod upper joint and the annular valve, the bottom of the upper plunger has an annular valve seat matching with the annular valve, the lower part of the annular valve is connected to a lower plunger through a plunger connecting joint, a liquid inlet sealing cylinder is sheathed on the outer side of the lower plunger, a liquid inlet sealing connecting pipe is sheathed on the outer side of the liquid inlet sealing connecting pipe, the liquid inlet sealing connecting pipe is connected with the bottom of the upper pump barrel, the liquid inlet sealing cylinder can move up and down in the liquid inlet sealing connecting pipe, a fixed ring valve is connected to the bottom of the liquid inlet sealing cylinder, a fixed valve seat matching with the fixed ring valve is provided below the fixed ring valve, and the fixed valve seat is fixedly connected to the inner wall of the liquid inlet sealing connecting pipe.

[0005] In the horizontal oil pump of the present invention, an upper plunger sealing seat is arranged on the top of the upper plunger, and the upper plunger sealing seat contacts the bottom of the upper joint of the center pull rod to form a seal.

[0006] In a horizontal oil pump of the present invention, the top of the upper pump barrel is connected with an upper joint, the bottom of the liquid inlet sealing connecting pipe is connected with a lower joint, and the top of the lower joint presses the fixed valve seat tightly.

[0007] In the horizontal oil pump of the present invention, the annular valve and the plunger connecting joint are locked by a pin.

[0008] In the horizontal oil pump of the present invention, the top of the upper joint of the center pull rod has a threaded structure.

[0009] The beneficial effects of the present invention are as follows: a horizontal oil pump is proposed, which adopts a floating annular valve and a fixed annular valve structure that are forced to open and close. The center pull rod is used to push the upper plunger and the lower plunger to move through the power of the sucker rod column or the hydraulic lifting system. The upper plunger and the lower plunger drive the floating annular valve and the fixed annular valve to open and close, eliminating the problem of unreliable gravity sealing of conventional valve balls in horizontal wells and high-angle wells; a large flow channel liquid inlet valve structure is adopted to reduce the flow resistance of crude oil entering the suction chamber of the pump barrel, which is beneficial to improving the pumping efficiency of the oil pump; there is only one center pull rod between the sucker rod or the hydraulic lifting device and the horizontal oil pump, which eliminates the stroke loss caused by the elastic expansion and contraction of the rod column, increases the effective stroke of the pump, and improves the pumping efficiency of the horizontal oil pump, and can be used in high-angle wells and horizontal wells. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] The present invention will be further described below with reference to the accompanying drawings and embodiments, in which: Figure 1 is a schematic diagram of an embodiment of the present invention; Figure 2 is a schematic diagram of a liquid inlet sealing cylinder according to an embodiment of the present invention; Figure 3 Schematic diagram of the upper joint of the center pull rod according to an embodiment of the present invention. DETAILED DESCRIPTION

[0011] In order to make the purpose, technical scheme and advantages of the embodiments of the present invention clearer, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all the embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention. Based on the embodiments in 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.

[0012] like Figure 1-3As shown, a horizontal oil pump comprises: an upper pump barrel 3, a center rod 6 is installed in the upper pump barrel 3, a center rod upper joint 2 is installed on the top of the center rod 6, the center rod upper joint 2 is connected to the oil pumping pipe, an annular valve 8 is provided in the middle of the center rod 6, an upper plunger 5 is installed at a position between the center rod upper joint 2 and the annular valve 8 on the inner side of the upper pump barrel 3, an annular valve seat 7 matching the annular valve 8 is provided at the bottom of the upper plunger 5, and the lower part of the annular valve 8 is connected to the plunger through the joint 10 A lower plunger 11 is connected, and a liquid inlet sealing cylinder 13 is sheathed on the outer surface of the lower plunger 11. A liquid inlet sealing connecting tube 12 is sheathed on the outer surface of the liquid inlet sealing connecting tube 13. The liquid inlet sealing connecting tube 12 is connected to the bottom of the upper pump cylinder 3. The liquid inlet sealing connecting tube 13 can move up and down in the liquid inlet sealing connecting tube 12. A fixed ring valve 14 is connected to the bottom of the liquid inlet sealing connecting tube 13, and a fixed valve seat 15 matching with the fixed ring valve 14 is provided below the fixed ring valve 14. The fixed valve seat 15 is fixedly connected to the inner wall of the liquid inlet sealing connecting tube 12.

[0013] In a preferred embodiment of the present invention, an upper plunger sealing seat 4 is provided on the top of the upper plunger 5, and the upper plunger sealing seat 4 contacts the bottom of the upper joint 2 of the central pull rod to form a seal.

[0014] In a preferred embodiment of the present invention, the top of the upper pump barrel 3 is connected to an upper joint 1, the bottom of the liquid inlet sealing connecting pipe 12 is connected to a lower joint 16, and the top of the lower joint 16 presses the fixed valve seat 15 tightly.

[0015] In a preferred embodiment of the present invention, the annular valve 8 and the plunger connecting joint 10 are locked by a pin 9 .

[0016] In a preferred embodiment of the present invention, the top of the central pull rod upper joint 2 has a threaded structure.

[0017] In a preferred embodiment of the present invention, the upper end of the center pull rod upper joint 2 is a threaded structure with 2-8 grooves on the outside, and the lower end is a conical or truncated cone step.

[0018] In a preferred embodiment of the present invention, the liquid inlet sealing tube 13 has 2-8 grooves on the outside, a fixed ring valve 14 is connected to the lower end, and a liquid inlet sealing connecting pipe 12 is mounted on the outside. The liquid inlet sealing connecting pipe 12 is a hollow cylindrical structure, and a fixed valve seat 15 is connected to the lower end of the liquid inlet sealing connecting pipe 12.

[0019] In a preferred embodiment of the present invention, a lower plunger lower joint 17 is connected to the bottom of the lower plunger 11 .

[0020] Brief description of working process: Its working process is divided into upstroke and downstroke: Upstroke: The upper joint 2 of the center tie rod moves upward with the sucker rod or the hydraulic lifting device, and the annular valve 8 is driven upward by the center tie rod 6. When it contacts the annular valve seat 7 at the bottom of the upper plunger 5, a seal is formed. The liquid column pressure of the well fluid acts on the center tie rod 6. At the same time, the center tie rod 6 also drives the lower plunger 11 to move upward. At this time, the fixed ring valve 14 leaves the fixed ring valve seat 15. After running a certain distance, the liquid inlet sealing cylinder 13 can no longer move upward, and the crude oil flows into the suction chamber of the pump from the annular channel between the liquid inlet sealing connecting pipe 12 and the liquid inlet sealing cylinder 13, completing the pump's liquid pumping process.

[0021] Down stroke: After reaching the top dead center, the center tie rod or hydraulic lifting device moves downward, pushing the center tie rod upper joint 2 and the upper plunger 5 downward. The liquid column pressure of the well fluid acts on the center tie rod upper joint 2. At this time, the annular valve seat 7 at the bottom of the upper plunger 5 is separated from the annular valve 8. At the same time, the center tie rod 6 also drives the lower plunger 11 to move downward. After running a certain distance, the fixed ring valve 14 contacts the fixed ring valve seat 15 and forms a seal. The crude oil enters the upper part of the pump from the suction chamber of the pump, completing the pump's discharge process.

[0022] During the upstroke, since the annular valve 8 and the annular valve seat 7 are closed, the liquid column load of the oil pump is the product of the cross-sectional area of ​​the upper plunger and the liquid pressure on the upper part of the upper plunger. That is to say, the liquid column load of the pump during the upstroke is equal to the liquid column load of an ordinary conventional tube pump with the same pump diameter.

[0023] During the down stroke, since the fixed valve seat and the fixed valve are closed, the annular valve and the annular valve seat are opened, the upper end surface of the lower plunger exerts a downward hydraulic force to help the lower plunger move downward and overcome the downward resistance of the large and small hydraulic cylinders.

[0024] In the description of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0025] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. In addition, in the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0026] It should be understood that those skilled in the art can make improvements or changes based on the above description, and all these improvements and changes should fall within the scope of protection of the appended claims of the present invention.

Claims

1. A horizontal oil well pump, characterized in that: include: An upper pump barrel (3), wherein a center rod (6) is installed inside the upper pump barrel (3), a center rod upper joint (2) is installed on the top of the center rod (6), the center rod upper joint (2) is connected to the oil pumping pipe, an annular valve (8) is provided in the middle of the center rod (6), an upper plunger (5) is installed at a position between the center rod upper joint (2) and the annular valve (8) inside the upper pump barrel (3), the bottom of the upper plunger (5) has an annular valve seat (7) that cooperates with the annular valve (8), and the lower part of the annular valve (8) is connected to a lower plunger via a plunger connecting joint (10). The lower piston (11) is provided with a liquid inlet sealing cylinder (13) on the outside, and the liquid inlet sealing cylinder (13) is provided with a liquid inlet sealing connecting pipe (12) on the outside, and the liquid inlet sealing connecting pipe (12) is connected with the bottom of the upper pump cylinder (3), and the liquid inlet sealing cylinder (13) can move up and down in the liquid inlet sealing connecting pipe (12), and the bottom of the liquid inlet sealing cylinder (13) is connected with a fixed ring valve (14), and the fixed ring valve (14) has a fixed valve seat (15) matching therewith below, and the fixed valve seat (15) is fixedly connected to the inner wall of the liquid inlet sealing connecting pipe (12).

2. A horizontal oil well pump according to claim 1, characterized in that: An upper plunger sealing seat (4) is provided at the top of the upper plunger (5), and the upper plunger sealing seat (4) contacts the bottom of the upper joint (2) of the central pull rod to form a seal.

3. A horizontal oil well pump according to claim 1, characterized in that: The top of the upper pump barrel (3) is connected to an upper joint (1), the bottom of the liquid inlet sealing connecting pipe (12) is connected to a lower joint (16), and the top of the lower joint (16) presses tightly against the fixed valve seat (15).

4. A horizontal oil well pump according to claim 1, characterized in that: The annular valve (8) and the plunger connecting joint (10) are locked by a pin (9).

5. A horizontal oil well pump according to claim 1, characterized in that: The top of the central pull rod upper joint (2) has a threaded structure.

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