Tower underpower oil pumping unit

Abstract

This invention relates to a tower-type bottom-mounted power pumping unit, comprising a platform 26 and a belt roller 4 mounted on the platform 26, a reducer 16 mounted on a well base 22, and a counterweight 15 mounted inside a box-type derrick 11 that moves up and down. Its key feature is that the inner end of the belt 7 passes over the belt roller 4 and connects to the upper end of a chain-belt connector 13. The other end of the counterweight chain 12 is connected and fixed to the top of the counterweight 15 via a chain clip 14. The upper part of the counterweight chain 12 passes over the upper reversing sprocket 3, then downwards and over the lower reversing sprocket 20, before connecting upwards to the lower end of the chain-belt connector 13. A guide sprocket 2 is mounted to the lower left of the upper reversing sprocket 3 and drives the lower reversing sprocket 20 to rotate synchronously via a power sprocket 17 and a power chain 18. Its advantages are: the belt bears the weight of the sucker rod, the chain output power does not slip under overload, it has high output efficiency, and the chain automatically tensions due to the counterweight, eliminating the need for periodic adjustments.

Description

Technical Field

[0001] This invention relates to the field of tower pumping unit technology, specifically a tower-type bottom-mounted power pumping unit. Background Technology

[0002] Tower-type pumping units eliminate the walking beam, consisting only of a tower and a platform. They use belts and belt rollers to convert the circular motion of a reversible motor into the vertical linear motion of the sucker rod. Typically, the reversible motor and reducer are mounted on a platform at the top of the tower.

[0003] The authorization announcement date is May 17, 2022. The application number is 202122130131.X. The technical solution of the Chinese invention patent entitled "Tower-type bottom-mounted power pumping unit" describes that "the tower-type bottom-mounted power pumping unit includes a platform 5 and a guardrail 1 installed at the top of the derrick 6, and a support 8 connected between the middle of the derrick 6 and the well platform 14. Its characteristic is that the reducer 20 is installed on the base 18 below the derrick 6, ... and the sucker rod is dragged by the sucker rod hanger 13 to complete the oil pumping operation." This solution solved the old problem, but new problems arose. The power to pull the sucker rod comes from the friction between the belt roller and the belt. Although the counterweight maintains a near-balanced weight distribution at both ends of the belt, the belt roller and belt are still driven by friction, resulting in inevitable frictional losses. Furthermore, this balance is dynamic; the friction between the belt roller and the belt changes with operating conditions and seasonal temperature variations, requiring frequent adjustments to the counterweight parameters to prevent disruptions to the equipment's operation. Another significant issue is that both the belt and chain will stretch over time. Without sufficient adjustment space, the sucker rod stroke will shorten, reducing oil recovery. Previous adjustments involved manual shutdown, which is both time-consuming and negatively impacts recovery rates. Therefore, a tower-type bottom-mounted power pumping unit is proposed to address these problems. Summary of the Invention

[0004] The purpose of this invention is to provide a tower-type bottom-mounted power pumping unit to solve some problems in the prior art, such as the belts / chains becoming elongated after a period of use, which shortens the stroke of the sucker rod and affects the recovery rate.

[0005] To achieve the above objectives, the present invention provides the following technical solution: The tower-type bottom-mounted power pumping unit includes a platform 26 mounted on the top of a box-type derrick 11 and a belt roller 4 mounted on the platform 26. A reducer 16 is mounted on a well base 22, and a counterweight 15 is mounted inside the box-type derrick 11 and moves up and down. Its features are: the inner end of the belt 7 passes over the belt roller 4 and is connected to the upper end of the chain-belt connector 13; the other end of the counterweight chain 12 is connected and fixed to the top of the counterweight 15 via a chain clip 14; the upper part of the counterweight chain 12 passes over the upper reversing sprocket 3, goes down and then passes over the lower reversing sprocket 20, and then connects to the lower end of the chain-belt connector 13; the guide sprocket 2 is mounted to the lower left of the upper reversing sprocket 3 and drives the lower reversing sprocket 20 to rotate synchronously through the power sprocket 17 and the power chain 18.

[0006] Preferred: The main body of the chain-belt connector 13 is a fastening plate 133 with bolt tubes 134 at both ends and tightened by a set of flat-head bolts 131. Bolt hangers 132 are installed inside the bolt tubes 134. The lower end of the bolt hangers 132 is provided with a connecting ear 135 with an opening and a transverse connecting hole.

[0007] Preferably, there are two upper reversing sprockets 3, which are installed at both ends of a shaft and placed on both sides of the housing 1; there are also two lower reversing sprockets 20, which are respectively installed at both ends of the sprocket shaft 21 inside the well base 22, and there are also two counterweight chains 12 that cooperate with them.

[0008] Compared with the prior art, the beneficial effects of the present invention are: 1. In this invention, the use of chain and sprocket meshing to transmit power is more reliable than the use of friction between belt and belt roller alone. It does not slip under overload, does not affect oil production efficiency, and the whole machine has strong overload capacity. 2. In this invention, the chain is automatically tightened by the counterweight force and the working load tension, eliminating the need to periodically adjust the chain tension and reducing maintenance costs. Attached Figure Description

[0009] Figure 2 This is a schematic diagram of the main structure of the present invention; Figure 1 For the present invention Figure 2 A partial sectional view of the left view; Figure 3 This is an enlarged schematic diagram of the chain-belt connector structure. Figure 4 Front view of counterweight 15; Figure 5 for Figure 4 Right view of counterweight 15; Figure 6 A schematic diagram showing the positional relationship of the counterweight 15A-A plane within the box-type derrick 11.

[0010] In the diagram: 1-box body, 2-guide sprocket, 3-upper reversing wheel, 4-belt roller, 5-roller shaft, 6-roller shaft seat, 7-belt, 8-belt clamp, 9-oil rod clamp, 10-sucking rod, 11-box-type derrick, 12-counterweight chain, 13-chain-belt connector, 131-flat head bolt, 132-bolt hanger, 133-fastening plate, 134-bolt pipe, 135-connecting lug, 14-chain clamp, 15-counterweight, 151-aligning lug, 16-reducer, 17-drive sprocket, 18-drive chain, 19-main sprocket, 20-lower reversing sprocket, 21-sprocket shaft, 22-derrick base, 23-control box, 24-derrick platform, 25-support rod, 26-platform. Detailed Implementation

[0011] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0012] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0013] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following figures denote similar items; therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0014] In the description of this invention, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is generally based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this invention and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this invention; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0015] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0016] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this invention.

[0017] Please see Figure 1-3 ,as well as Figure 4-6 This invention provides a technical solution: a tower-type bottom-mounted power pumping unit with a box-type derrick 11, which is an improved derrick. A grooved track is installed in the middle of the inner side of the derrick, allowing the straightening lugs 141 on both sides of the counterweight 15 to move up and down within the track. The track is enclosed by stainless steel panels to prevent dust, rain, and snow. The top platform 26 is used to install components such as the belt roller 4, upper reversing sprocket 3, guide sprocket 2, roller shaft 5, and roller shaft seat 6. Above the platform 26 and outside the components, a closed box 1 is installed, with a maintenance access door and necessary lighting facilities. The platform 26 has working holes for the belt 7 and the counterweight chain 12 to enter and exit. One side of the box-type derrick 11 is supported by a support rod 25 connected to the well platform 24 for verticality correction. The belt clamp 8 and the tubing clamp 9 can be implemented using existing technology.

[0018] The belt roller 4 is mounted on the platform 26 via two roller seats 6 and one roller 5. The reducer 16 is mounted on the well base 22. The reducer 16 is driven by a 32 kW reversible motor. The commutation frequency of the reversible motor is controlled by a program set by a microcomputer installed in the control box 23. The counterweight 15 is mounted inside the box-type derrick 11 and moves up and down. The inner end of the belt 7 (relative to the end connected to the belt clip 8, inside the box-type derrick 11) passes over the belt roller 4 and connects to the upper end of the chain-belt connector 13. The other end of the counterweight chain 12 is connected and fixed to the top of the counterweight 15 via a chain clip 14. The structure of the counterweight 15 is as follows. Figure 4 , 5 As shown, this is basically consistent with existing technology. The upper part of the counterweight chain 12 passes over the upper reversing sprocket 3, goes down, then passes over the lower reversing sprocket 20, and returns upward to connect to the lower end of the chain-belt connector 13. The guide sprocket 2 is installed to the lower left of the upper reversing sprocket 3. One function of the guide sprocket 2 is to change the downward angle of the counterweight chain 12, and another function is to adjust the length of the counterweight chain 12. It should be noted that one of the problems that this invention aims to solve is that the counterweight chain 12 becomes longer due to wear and tear from long-term use, affecting the effective stroke of the sucker rod and thus reducing the oil recovery rate of a single well. The main solution of this invention is that the counterweight chain 12 changes direction twice at the upper and lower reversing sprockets and finally connects downward to the counterweight 15. Because of the downward gravity of the counterweight 15, the counterweight chain 12 is naturally straightened. Furthermore, the counterweight 15 is located in the lower part of the box-type derrick 11, with a certain amount of space reserved so that the elongated part is "stretched and consumed," which is a kind of automatic compensation for the stretched part. The drive sprocket 17, drive chain 18, and drive reversing sprocket 20 rotate synchronously. Although they use the same chain, their rotational angular velocities may differ due to the different number of teeth, but this will not affect their ability to transmit power.

[0019] exist Figure 3 In the chain-belt connector 13, the main body is a fastening plate 133 with bolt tubes 134 at both ends and tightened by a set of flat-head bolts 131. Bolt hangers 132 are installed inside the bolt tubes 134. The lower end of the bolt hangers 132 is provided with a connecting ear 135 with a hole and a transverse connecting hole, so as to realize the conversion connection between two belts 7 and two counterweight chains 12.

[0020] like Figure 2 , 3As shown in Figure 4, there are two upper reversing sprockets 3, which are installed at both ends of a shaft and placed on both sides of the housing 1; there are also two lower reversing sprockets 20, which are installed at both ends of the sprocket shaft 21 inside the well base 22; there are also two counterweight chains 12 that cooperate with them; the drive sprocket 17 and the main sprocket 19 are parallel double wheels, and the drive chain 18 is a double chain that matches them, and existing products of the corresponding model can be selected.

[0021] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A tower-type bottom-mounted power pumping unit, comprising a platform (26) installed at the top of a box-type derrick (11) and a belt roller (4) installed on the platform (26), a reducer (16) installed on a well base (22), and a counterweight (15) installed inside the box-type derrick (11) for vertical movement, characterized in that: The inner end of the belt (7) passes over the belt roller (4) and is connected to the upper end of the chain-belt connector (13). The other end of the counterweight chain (12) is connected and fixed to the top of the counterweight (15) via the chain clip (14). The upper part of the counterweight chain (12) passes over the upper reversing sprocket (3), then passes down and then over the lower reversing sprocket (20), and then connects to the lower end of the chain-belt connector (13). The guide sprocket (2) is installed to the lower left of the upper reversing sprocket (3) and drives the lower reversing sprocket (20) to rotate synchronously through the drive sprocket (17) and the drive chain (18).

2. The tower-type bottom-mounted power pumping unit according to claim 1, characterized in that: The main body of the chain-belt connector (13) is a fastening plate (133) with bolt tubes (134) at both ends and tightened by a set of flat-head bolts (131). A bolt hanger (132) is installed inside the bolt tube (134), and the lower end of the bolt hanger (132) is provided with a connecting ear (135) with an opening and a transverse connecting hole.

3. The tower-type bottom-mounted power pumping unit according to claim 1, characterized in that: There are two upper reversing sprockets (3), which are installed at both ends of a shaft and placed on both sides of the housing (1); there are also two lower reversing sprockets (20), which are installed at both ends of the sprocket shaft (21) inside the well base (22), and there are also two counterweight chains (12) that cooperate with them.

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