Downhole sucker rod limiting and guiding device

Abstract

The utility model relates to the technical field of oil exploitation equipment, in particular to an underground sucker rod limiting and guiding device which comprises a connecting pipe, a connecting sleeve of an integrated structure is fixedly arranged at the lower end of the connecting pipe, a centralizing sleeve is arranged on the connecting pipe in a sleeved mode, four sets of cavity grooves are symmetrically formed in the annular face of the centralizing sleeve, and an arch-shaped spring piece is arranged at the bottom of each set of cavity groove. A movable adjusting block is fixedly arranged at the upper end of the spring piece, an adjusting bolt is in threaded connection with the position, corresponding to the adjusting block, of the upper surface of the centralizing sleeve, the lower end of the adjusting bolt is connected with the adjusting block in an abutting mode, an adjustable limiting guide plate of an arc-shaped structure is arranged in the cavity groove, and a limiting baffle is arranged at the bottom. A plurality of groups of guide balls capable of freely rotating are embedded in the outer side surface of the limiting guide plate; and pressing sheets for blocking the limiting baffle are arranged at the edges of the upper side and the lower side of the cavity groove. The limiting guide device has a diameter adjusting function and can be suitable for oil pumping pipes with different diameter specifications, the whole guide device does not need to be replaced, and the universality and the use efficiency of equipment are improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to petroleum exploitation equipment technical field, specifically, relates to a downhole sucker rod positioner. BACKGROUND

[0002] Petroleum exploitation refers to the process of exploiting underground oil resources to the ground through a series of technical means such as geological exploration, drilling, well completion and oil production. Petroleum is one of the most important energy and chemical raw materials in the world today, and is widely used in transportation, chemical industry, manufacturing and other fields. Petroleum exploitation is of great significance to meet global energy demand and promote economic development. At the same time, petroleum exploitation is also a key link to ensure national energy security and promote sustainable economic development.

[0003] In the process of petroleum exploitation, the sucker rod, as an important part of the oil pumping well, undertakes the key task of transmitting power and driving the oil pump to pump oil. In order to prevent the eccentric wear between the downhole sucker rod and the oil pipe, a positioner is usually installed on the sucker rod to keep the sucker rod centered in the oil pipe and reduce the occurrence of eccentric wear. However, due to the diversity of oil pumping specifications and different diameters, the existing positioner is often fixed in diameter and cannot be adjusted according to different diameter oil pipes, which has poor applicability, resulting in the need to install different specifications of positioner according to different diameter oil pipes during oil pumping, increasing the operation complexity and affecting the oil pumping efficiency. Therefore, it is particularly important to develop a downhole sucker rod positioner with diameter adjustment function. SUMMARY

[0004] In view of the existing deficiencies, the utility model provides a downhole sucker rod positioner, which solves the problems raised in the above background technology. The positioner of the utility model has a diameter adjustment function and can be applied to different diameter specifications of oil pipes without replacing the entire positioner, improving the versatility and use efficiency of the equipment.

[0005] To achieve the above purpose, the technical scheme adopted by the utility model is as follows:

[0006] The utility model provides a kind of downhole sucker rod limiting guide device, including connecting pipe and centralizer, the lower end of the connecting pipe is fixedly provided with a integral structure's nipple, the connecting pipe is sleeved with centralizer, the cavity slot of four groups is opened symmetrically in the ring surface inside of the centralizer, the bottom of each group cavity slot is equipped with arc spring leaf, the upper end of the spring leaf is fixedly provided with movable adjusting block, adjusting bolt is screwed in the upper surface of the centralizer and adjusting block corresponding place, and the lower end of the adjusting bolt is in contact with adjusting block, the cavity slot is equipped with the limiting guide plate of adjustable arc structure, the bottom is equipped with limit baffle, and the back of the limit baffle is in contact with spring leaf surface, a plurality of freely rotatable guide balls are embedded on the outside of the limiting guide plate, the cavity slot upper and lower two side edges are provided with the pressing sheet for blocking limit baffle.

[0007] Further, the outer ring surface of the connecting pipe is engraved with external threads at the upper end, and the inner ring surface of the nipple is engraved with internal threads.

[0008] Further, the lower end of the spring leaf is fixedly provided with a fixed block, and the fixed block is fixedly connected to the inner wall of the cavity slot.

[0009] Further, the bottom surface of the cavity slot is provided with a T-shaped limiting sliding groove, the left side of the adjusting block is fixedly provided with a T-shaped limiting sliding block matched with the limiting sliding groove, and the limiting sliding block is clamped into the limiting sliding groove in sliding connection therewith.

[0010] Further, a supporting spring is arranged between the inner side of the pressing sheet and the limit baffle, one end of the supporting spring is fixedly connected to the limit baffle, and the other end is movably connected to the pressing sheet.

[0011] Further, the pressing sheet is detachably connected to the centralizer by screws.

[0012] Compared with the prior art, the utility model has the following beneficial effects:

[0013] 1. The limiting guide device has a diameter adjusting function, which can be adjusted according to different diameters of the oil extraction pipe by the cooperation of the adjusting bolt and the spring leaf, can be suitable for oil extraction pipes of different diameters, improves the applicability of the device, and simplifies the operation process without the need to install different specifications of limiting guide devices for oil extraction pipes of different diameters.

[0014] 2. The limiting guide plate and the pressing sheet in the utility model are designed to be detachable, which facilitates installation and disassembly, and when the guide balls on the limiting guide plate need to be replaced due to wear, only the separate limiting guide plate needs to be disassembled and replaced, without the need to replace the entire guide device, thereby reducing the use cost.

[0015] 3、The utility model discloses a T-shaped structure's limit sliding slot provides a stable sliding track for the adjusting block, with the cooperation of the limit sliding block and the limit sliding slot, the stability and accuracy of the adjusting block during the movement are ensured, the movement range of the adjusting block is limited, the adjusting block is prevented from exceeding the predetermined position, the adjusting block keeps stable during the movement, and the stable pressure of the spring piece can be formed.

[0016] 4、The utility model discloses a support spring is equipped between the inside surface of the pressing piece and the limit baffle, one end of the support spring is fixedly connected with the limit baffle, and the other end is movably connected with the pressing piece. The support spring provides support force for the limit baffle and the limit guide plate, can make the bottom surface of the limit baffle always be connected with the spring piece, bear the elastic force from the spring piece, and help to keep the accuracy of the limit guide device. DRAWINGS

[0017] Fig. 1 It is the overall structure schematic diagram of the utility model.

[0018] Fig. 2 It is the sectional view of the utility model.

[0019] Fig. 3 It is the front view sectional view of the utility model's righting sleeve.

[0020] Fig. 4 It is the structure schematic diagram of the utility model's righting sleeve.

[0021] In the drawing: 1, connecting pipe, 2, righting sleeve, 3, limit guide plate, 4, guide ball, 5, joint, 6, pullout slot, 7, external thread, 8, adjusting bolt, 9, pressing piece, 10, limit baffle, 11, support spring, 12, spring piece, 13, internal thread, 14, fixed block, 15, adjusting block, 16, limit sliding block, 17, limit sliding slot, 18, cavity groove. DETAILED DESCRIPTION

[0022] The technical scheme in the embodiments of the utility model will be described clearly and completely in combination with the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by the person skilled in the art without creative labor belong to the protection scope of the utility model.

[0023] Embodiment:

[0024] As Figs. 1 to 4As shown, a downhole sucker rod limiting guide device, including connecting pipe 1 and centralizing sleeve 2, the lower end of connecting pipe 1 is fixedly provided with an integral structure of adapter 5, connecting pipe 1 cooperates with adapter 5 to realize stable connection with the sucker rod, connecting pipe 1 is sleeved with centralizing sleeve 2 for providing support and guidance, ensuring stable operation of the sucker rod in the well, four groups of cavity grooves 18 are symmetrically provided in the inner ring surface of centralizing sleeve 2, each group of cavity grooves 18 is provided with an arc spring plate 12 at the bottom, the spring plate 12 can support the limiting baffle 10 from the bottom, and simultaneously drive the limiting baffle 10 to move through its own deformation, thereby adjusting the position of the limiting guide plate 3, realizing the adjustment of the diameter of the device, the upper end of the spring plate 12 is fixedly provided with a movable adjusting block 15, the upper surface of the centralizing sleeve 2 is screwed with an adjusting bolt 8 corresponding to the adjusting block 15, and the lower end of the adjusting bolt 8 is in abutting connection with the adjusting block 15, the position of the adjusting block 15 can be adjusted by rotating the adjusting bolt 8, thereby changing the deformation degree of the spring plate 12, the limiting guide plate 3 with an adjustable arc structure is arranged in the cavity groove 18, a limiting baffle 10 is arranged at the bottom, and the back surface of the limiting baffle 10 is in abutting connection with the surface of the spring plate 12, a plurality of freely rotatable guide balls 4 are embedded on the outer side surface of the limiting guide plate 3, the guide balls 4 can be in rolling connection with the inner wall of the oil extraction pipe, reducing the friction between the guide balls 4 and the oil extraction pipe, the pressing piece 9 for blocking the limiting baffle 10 is arranged at the upper and lower sides of the cavity groove 18, the pressing piece 9 prevents the limiting baffle 10 and the limiting guide plate 3 from coming out of the cavity groove 18, ensuring that they always remain in the correct working position, this design solves the problem that the existing limiting guide device is often fixed in diameter and cannot be adjusted according to different diameters of the oil extraction pipe, which has poor applicability, resulting in the need to install different specifications of the limiting guide device according to different diameters of the oil extraction pipe during the oil extraction process, increasing the operation complexity and affecting the oil extraction efficiency.

[0025] In this embodiment, external threads 7 are engraved on the upper end of the outer ring surface of the connecting pipe 1, and internal threads 13 are engraved on the inner ring surface of the adapter 5, which are used to realize stable connection between the device and the external oil extraction pipe.

[0026] In this embodiment, the lower end of the spring plate 12 is fixedly provided with a fixed block 14, and the fixed block 14 is fixedly connected to the inner wall of the cavity groove 18, which plays a limiting and fixing role for the spring plate 12, preventing the spring plate 12 from shifting during adjustment, and ensuring that the spring plate 12 can always maintain the correct installation position and posture.

[0027] In the embodiment, the bottom surface of the cavity groove 18 is provided with a T-shaped limiting sliding groove 17, the left side of the adjusting block 15 is fixedly provided with a T-shaped limiting sliding block 16 matched with the limiting sliding groove 17, and the limiting sliding block 16 is clamped into the limiting sliding groove 17 and is in sliding connection with the limiting sliding groove 17. The T-shaped limiting sliding groove 17 provides a stable sliding track for the adjusting block 15, so that the adjusting block 15 can move along a predetermined path in the cavity groove 18, the cooperation of the limiting sliding block 16 and the limiting sliding groove 17 ensures the stability and accuracy of the adjusting block 15 during movement, limits the movement range of the adjusting block 15, prevents it from exceeding the predetermined position, and makes the adjusting block 15 stable during movement, so that a stable pressure on the spring sheet 12 can be formed.

[0028] In the embodiment, the supporting spring 11 is arranged between the inner side surface of the pressing piece 9 and the limiting baffle 10, one end of the supporting spring 11 is fixedly connected with the limiting baffle 10, and the other end is movably connected with the pressing piece 9. The supporting spring 11 provides a supporting force for the limiting baffle 10 and the limiting guide plate 3, can make the bottom surface of the limiting baffle 10 always abut against the spring sheet 12, bear the elastic force from the spring sheet 12, and help to keep the accuracy of the limiting guide device.

[0029] In the embodiment, the pressing piece 9 is detachably connected with the centralizing sleeve 2 through a screw. The use of the screw makes the installation and dismounting between the pressing piece 9 and the centralizing sleeve 2 simple and fast. When maintenance or replacement of parts is needed, only the corresponding tool is needed to loosen or tighten the screw, without the need for complex operation, thereby improving the operation convenience. Meanwhile, when the limiting guide plate 3 needs to be overhauled, the pressing piece 9 and the limiting guide plate 3 can be quickly dismounted from the centralizing sleeve 2 for inspection, repair or replacement, thereby greatly improving the maintenance efficiency.

[0030] The working principle of the downhole sucker rod limiting guide device is as follows:

[0031] In actual use, the device is installed and connected to the sucker rod through the external thread 7 and the internal thread 13, then the sucker rod is put into the sucker rod pipe, the guide ball 4 on the limiting guide plate 3 is attached to the inner wall of the sucker rod pipe and rolls, thereby reducing the friction between the limiting guide plate 3 and the sucker rod pipe and keeping the sucker rod in the center of the sucker rod pipe;

[0032] When the diameter of the device needs to be adjusted, turn the adjusting bolt 8, move the adjusting block 15 downward by the adjusting bolt 8, extrude the spring sheet 12 downward by the adjusting block 15, make the spring sheet 12 deform, increase the bending degree, increase the horizontal width, and then push the limiting guide plate 3 to move outward by the deformation of the spring sheet 12, so that the overall diameter of the device increases to adapt to the larger diameter of the oil pumping pipe.

[0033] When the guide ball 4 on the limiting guide plate 3 needs to be replaced due to wear, only the screws on the pressing sheet 9 need to be removed, and then the limiting guide plate 3 can be replaced without the need to replace the entire guiding device.

[0034] In summary, the downhole oil pumping rod limiting guide device realizes stable guiding and supporting of the oil pumping rod in the well, and improves the applicability and maintenance efficiency of the device. The adjustable components inside the device can adapt to oil pumping pipes of different diameters, reduce the operation complexity, and improve the oil pumping efficiency. In addition, by reducing the friction with the oil pumping pipe and improving the detachability, the performance and use convenience of the device are further improved.

[0035] Obviously, the above embodiments of the utility model are only examples for clearly illustrating the utility model, and are not a limitation on the embodiments of the utility model. For ordinary skilled in the art, on the basis of the above description, other different forms of changes or variations can be made, and it is impossible to enumerate all the embodiments here. Any changes or variations derived from the technical solutions of the utility model still fall within the protection scope of the utility model.

Claims

1. A downhole sucker rod limiting guide device, comprising a connecting pipe (1) and a centralizing sleeve (2), characterized in that: The lower end of the connecting pipe (1) is fixedly provided with a connecting sleeve (5) of an integrated structure, the upper sleeve of the connecting pipe (1) is provided with a straightening sleeve (2), the inner ring surface of the straightening sleeve (2) is symmetrically provided with four groups of cavities (18), the bottom of each group of the cavities (18) is provided with a bow-shaped spring sheet (12), the upper end of the spring sheet (12) is fixedly provided with a movable adjustment block (15), the upper surface of the straightening sleeve (2) and the corresponding position of the adjustment block (15) are screwed with an adjustment bolt (8), and the adjustment bolt (8) The lower end is in contact with the adjustment block (15), and an adjustable arc-shaped limit guide plate (3) is provided inside the cavity (18). The bottom is provided with a limit baffle (10), and the back of the limit baffle (10) is in contact with the surface of the spring sheet (12). Multiple groups of freely rotatable guide balls (4) are embedded on the outer surface of the limit guide plate (3), and pressure plates (9) for blocking the limit baffle (10) are provided at the upper and lower edges of the cavity (18).

2. The downhole sucker rod limiting guide device according to claim 1, characterized in that: An external thread (7) is engraved on the upper end of the outer annular surface of the connecting pipe (1), and an internal thread (13) is engraved on the inner annular surface of the connecting sleeve (5).

3. The downhole sucker rod limiting guide device according to claim 1, characterized in that: A fixing block (14) is fixedly provided at the lower end of the spring sheet (12), and the fixing block (14) is fixedly connected to the inner wall of the cavity (18).

4. The downhole sucker rod limiting guide device according to claim 1, characterized in that: A T-shaped limiting slide groove (17) is provided on the bottom surface of the cavity (18), and a T-shaped limiting slider (16) adapted to the limiting slide groove (17) is fixedly provided on the left side of the adjustment block (15), and the limiting slider (16) is snapped into the limiting slide groove (17) and slidably connected thereto.

5. The downhole sucker rod limiting guide device according to claim 1, characterized in that: A support spring (11) is provided between the inner side of the pressing plate (9) and the limiting baffle (10), one end of the support spring (11) is fixedly connected to the limiting baffle (10), and the other end is movably connected to the pressing plate (9).

6. The downhole sucker rod limiting guide device according to claim 1, characterized in that: The pressing sheet (9) is detachably connected to the straightening sleeve (2) via screws.

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