Small-displacement long-plunger tubular deep pumping pump

Abstract

The utility model provides a small displacement long plunger tubular deep pump which comprises an oil pipe, an upper coupling, a gap bridge pipe, a short pump cylinder and a pump cylinder lengthening cylinder which are arranged in the gap bridge pipe, the upper end of the long plunger is connected with a sucker rod string through an upper traveling valve and an upper valve cover, and an annular deposited falling object space is formed between the outer circle of the pump cylinder lengthening cylinder and an inner hole of the gap bridge pipe. The short pump is characterized in that a gap is formed between the upper traveling valve and the upper valve cover and the upper coupling, a guiding and righting supporting ring is arranged at the upper end of the short pump cylinder, and a gap facilitating falling of deposited falling objects is formed in the guiding and righting supporting ring. Gaps are arranged between the upper traveling valve and the upper coupling and between the upper valve cover and the upper coupling, no guide supporting piece is arranged, space is provided for sediment falling, the guide righting supporting ring is arranged at the upper end of the short pump cylinder, the piston guide function and the righting supporting function can be achieved, the functions of the piston and the righting supporting ring are integrated, the structure is simplified, and the service life of the pump is prolonged. And the construction efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the field of rod oil extraction equipment, in particular to a small-displacement long-plunger-tube type deep extraction pump. Background Art

[0002] Currently, oilfields primarily use conventional tubing pumps for mechanical oil recovery. However, during oil well production, debris inevitably accumulates within the tubing: debris that falls from the wellhead during operation, scale and rust that detach from the sucker rod and tubing, rubber fragments that become suspended in the oil after being peeled off the packer rubber sleeve, and mud and sand carried over from the oil. These debris can harm oil well production and cause pump failure. Therefore, a low-displacement, long-plunger tubing deep pump is needed that can prevent piston sand and scale from becoming stuck. Utility Model Content

[0003] The utility model aims to provide a small-displacement long-plunger-tube deep-draw pump which can effectively deposit the produced minerals in the outer cavity of the pump and avoid sand and scale stuck on the piston.

[0004] The utility model is achieved in this way:

[0005] The utility model provides a small-displacement long-plunger tube deep suction pump, comprising an oil pipe, an upper coupling, and a bridge pipe. The upper end of the bridge pipe is connected to the oil pipe through the upper coupling, and the lower end of the bridge pipe is connected to the lower coupling. The lower end of the lower coupling is connected to the oil drain and the fixed valve in sequence. The short pump barrel and the pump barrel extension barrel are in the bridge pipe, and the short pump barrel is connected to the pump barrel extension barrel and is sleeved on the long plunger; the upper end of the long plunger is connected to the sucker rod column through the upstream movable valve and the upper valve cover, and the lower end of the long plunger is connected to the joint through the downstream movable valve, and the lower end of the pump barrel extension barrel is connected to the lower coupling. An annular sedimentation space is formed between the outer circle of the pump barrel extension barrel and the inner hole of the bridge pipe, and the characteristic is that a gap is set between the upstream movable valve and the upper valve cover and the upper coupling, and a guide and straightening support ring is provided at the upper end of the short pump barrel, and a gap is provided on the guide and straightening support ring for facilitating the falling of sediment.

[0006] In some optional embodiments, the guide and straightening support ring includes a support ring body, and a plurality of guide support wings are arranged at circumferential intervals on the support ring body, with gaps formed between adjacent guide support wings. The inner sides of the upper ends of the plurality of guide support wings form an inner conical surface that is larger at the top and smaller at the bottom, forming a guide inner conical surface for the passage of a long plunger.

[0007] In some optional embodiments, an inclined surface is provided on the upper section of the inner hole of the guide support wing, and a connecting portion is provided on the inner hole section for connection with a short pump barrel.

[0008] In some optional embodiments, a limiting shoulder is provided on the connecting portion.

[0009] In some optional embodiments, the size of the upper valve cover is reduced to within 48 mm.

[0010] In some optional embodiments, the short pump barrel is fitted with the piston using a primary clearance.

[0011] In some optional embodiments, the short pump barrel seal length is at least 1.5 m.

[0012] In some optional embodiments, the number of the guide support wings is 3-5.

[0013] The beneficial effects of the present invention are as follows: the present invention sets a gap between the upstream movable valve and the upper valve cover and the upper coupling, and does not set a guide support member, which provides space for sediment to fall, and a guide and straightening support ring is provided at the upper end of the short pump barrel, which can play the role of piston guide and straightening support, integrating the functions of the two, simplifying the structure and improving construction efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0015] Figure 1 The present invention provides a schematic structural diagram of a small-displacement long-plunger-tube deep-draw pump according to an embodiment of the present invention.

[0016] Figure 2 A method provided by the embodiment of the present utility model DETAILED DESCRIPTION

[0017] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0018] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort are also within the scope of protection of the present invention.

[0019] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0020] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer" and the like, indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the product of the application is typically placed when in use. These terms are intended solely to facilitate the description of this utility model and to simplify the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third," etc., are used solely to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0021] Furthermore, terms such as "horizontal," "vertical," and "overhanging" do not necessarily imply that a component must be absolutely horizontal or overhanging, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but rather that it can be slightly tilted.

[0022] It should also be noted that, in the description of this utility model, unless otherwise expressly specified or limited, the terms "disposed," "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; direct connections, indirect connections through an intermediate medium, and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0023] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0024] The features and performance of the present invention are further described in detail below in conjunction with the embodiments.

[0025] like Figure 1As shown, the utility model provides a small-displacement long plunger tube deep pump, including an oil pipe (not shown in the figure, a protective cover is set at the connection of the oil pipe), an upper coupling 4, and a bridge pipe 5. The upper end of the bridge pipe 5 is connected to the oil pipe through the upper coupling 2, and the lower end of the bridge pipe is connected to the lower coupling 11. The lower end of the lower coupling is connected to the oil drain 12 and the fixed valve 13 in sequence. The short pump barrel 7 and the pump barrel extension barrel 9 are in the bridge pipe 5, the short pump barrel 7 is connected to the pump barrel extension barrel 9, and is sleeved on the long plunger 8. Upper; the upper end of the long plunger 8 is connected to the sucker rod column through the upstream movable valve 3 and the upper valve cover 1, the lower end of the long plunger 8 is connected to the joint through the downstream movable valve, the lower end of the pump barrel extension tube is connected to the lower coupling 10, and an annular sedimentation space is formed between the outer circle of the pump barrel extension tube and the inner hole of the bridge pipe. A gap 14 is set between the upstream movable valve and the upper valve cover and the upper coupling, and a guide and straightening support ring 6 is provided at the upper end of the short pump barrel, and a gap 15 is provided on the guide and straightening support ring to facilitate the falling of sediment.

[0026] like Figure 2 As shown, the guide straightening support ring 6 includes a support ring body 601, and a plurality of guide support wings 604 are arranged at circumferential intervals on the support ring body 601, with gaps 15 formed between adjacent guide support wings. The inner sides of the upper ends of the plurality of guide support wings form an inner conical surface that is larger at the top and smaller at the bottom, forming a guide inner conical surface for the passage of a long plunger. Specifically, an inclined surface 605 is provided on the upper section of the inner hole of each guide support wing 604, and a connecting portion 602 is provided on the inner hole section for connection to a short pump barrel. A limiting shoulder 603 is provided on the connecting portion for axial positioning of the short pump barrel. The number of the guide support wings is 3-5, preferably 4.

[0027] The utility model designs a structure in which a piston guide is introduced and a sealing pump barrel is straightened as one body in the bridge pipe. The size of the upper valve cover is reduced from 52mm to 48mm, so that a gap is set between the upstream movable valve and the upper valve cover and the upper coupling, so that the output minerals are effectively deposited in the outer cavity of the pump, avoiding sand and scale stuck in the piston.

[0028] This embodiment utilizes a long plunger and short pump barrel. The short pump barrel maintains a primary clearance with the piston, increasing the short pump barrel seal length from the conventional 1.2m to 1.5m. This effectively reduces leakage between the piston and the short pump barrel caused by increased pressure differentials after deep pumping. Furthermore, a 28mm long plunger is used with a 44mm outer diameter end-seal pump barrel. The upstream and downstream valves supporting the plunger have 16mm balls and titanium balls with tungsten seats, enhancing the strength of the pump and valve.

[0029] The working principle of this utility model is as follows:

[0030] During the upward stroke, the plunger assembly moves upward driven by the sucker rod, the upstream flow valve and the downstream flow valve are closed, the volume of the pump chamber below the plunger assembly increases, the pressure drops, the fixed valve opens under the action of the sinking pressure, and the liquid in the annular cavity between the oil pipe and the casing enters the pump chamber below the plunger assembly.

[0031] During the downstroke, the plunger assembly moves downward, the volume of the pump chamber below the plunger assembly decreases, the pressure increases, the fixed valve closes under the action of its own gravity and the chamber pressure, the upstream and downstream movable valves open under the action of the chamber pressure, and the liquid in the pump chamber below the plunger assembly is discharged into the oil pipe above the plunger assembly.

[0032] The utility model sets a gap between the upstream movable valve, the upper valve cover and the upper coupling, and does not set a guide support member, which provides space for sediment to fall. A guide and straightening support ring is provided at the upper end of the short pump barrel, which can play the role of piston guide and straightening support, integrating the functions of the two, simplifying the structure and improving construction efficiency.

[0033] The embodiments described above are only some of the embodiments of the present invention, not all of them. The detailed description of the embodiments of the present invention is not intended to limit the scope of the claimed invention, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without inventive effort are also within the scope of protection of the present invention.

Claims

1. A small-displacement long-plunger tube deep pump, comprising an oil pipe, an upper coupling, and a bridge pipe. The upper end of the bridge pipe is connected to the oil pipe via the upper coupling, the lower end of the bridge pipe is connected to the lower coupling, the lower end of the lower coupling is sequentially connected to an oil drain and a fixed valve, a short pump barrel and a pump barrel extension are within the bridge pipe, the short pump barrel is connected to the pump barrel extension, and is sleeved on the long plunger; the upper end of the long plunger is connected to the sucker rod string via an upstream movable valve and an upper valve cover, the lower end of the long plunger is connected to a joint via a downstream movable valve, the lower end of the pump barrel extension is connected to the lower coupling, and an annular sedimentation space is formed between the outer circumference of the pump barrel extension and the inner hole of the bridge pipe, characterized in that: A gap is set between the upstream movable valve, the upper valve cover and the upper coupling, and a guide and straightening support ring is provided at the upper end of the short pump barrel. The guide and straightening support ring is provided with a gap for facilitating the falling of deposited objects.

2. A small displacement long plunger tube type deep pump according to claim 1, characterized in that: The guide and straightening support ring includes a support ring body, and a plurality of guide support wings are arranged at circumferential intervals on the support ring body, with gaps formed between adjacent guide support wings. The inner sides of the upper ends of the plurality of guide support wings form an inner conical surface that is larger at the top and smaller at the bottom, forming a guide inner conical surface for the passage of a long plunger.

3. A small displacement long plunger tube type deep pump according to claim 2, characterized in that: An inclined surface is provided on the upper section of the inner hole of the guide support wing, and a connecting portion is provided on the inner hole section for connection with a short pump barrel.

4. A small displacement long plunger tube type deep pump according to claim 3, characterized in that: A limiting shoulder is provided on the connecting portion.

5. A small displacement long plunger tube type deep pump according to claim 2, characterized in that: The size of the upper valve cover is reduced to within 48 mm.

6. A small displacement long plunger tube type deep pump according to claim 1 or 2, characterized in that: The short pump barrel and the piston adopt a first-level clearance fit.

7. A small displacement long plunger tube type deep pump according to claim 1 or 2, characterized in that: The short pump barrel seal length is at least 1.5m.

8. A small displacement long plunger tube type deep pump according to claim 2, characterized in that: There are 3-5 guide support wings.

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