High-temperature thickened oil well submersible linear motor and sliding guide sleeve thereof

Abstract

The application discloses a sliding guide sleeve of a submersible linear motor for a high-temperature heavy oil well, which comprises a sliding guide sleeve body, a guide sleeve seat sleeved outside the sliding guide sleeve body, and a guide sleeve retainer ring sleeved between the guide sleeve seat and the sliding guide sleeve body; the thermal expansion coefficient of the guide sleeve retainer ring is smaller than that of the guide sleeve seat and larger than that of the sliding guide sleeve body; the elastic modulus of the guide sleeve retainer ring is smaller than that of the sliding guide sleeve body and that of the guide sleeve seat; and the guide sleeve seat and the guide sleeve retainer ring and the guide sleeve retainer ring and the sliding guide sleeve body are in interference fit. The sliding guide sleeve can be applied to the high-temperature heavy oil well, can avoid losing the fixing and limiting effects of the sliding guide sleeve in a high-temperature environment, can avoid excessive internal stress of the sliding guide sleeve, and can reduce the risk of fragmentation. The application further discloses a submersible linear motor for a high-temperature heavy oil well comprising the sliding guide sleeve, and the beneficial effects of the submersible linear motor are the same as those of the sliding guide sleeve.

Description

Technical Field

[0001] This invention relates to the field of linear motor technology, and in particular to a sliding guide sleeve. Furthermore, this invention also relates to a high-temperature heavy oil well submersible linear motor including the aforementioned sliding guide sleeve. Background Technology

[0002] Heavy oil is one of the important future energy alternatives, characterized by high viscosity, large reserves, and high extraction difficulty. One current extraction method involves injecting high-temperature, high-pressure steam into the well and maintaining it for a period of time—a process known as "steam well sealing"—to reduce the viscosity of the heavy oil at high temperatures before extraction. The high-temperature steam reaches extremely high temperatures, up to 370°C, posing a significant challenge to oil extraction equipment.

[0003] In existing technology, a reciprocating submersible electric pump has revolutionized the lifting method of crude oil extraction. It features simple structure, energy saving and consumption reduction, convenient operation, and online parameter adjustment, completely solving the long-standing problems of sucker rod detachment, breakage, and tubing wear in mechanical oil production both domestically and internationally. This product can not only replace traditional oil production methods but is also highly suitable for horizontal wells, directional wells, and low-permeability oil reservoirs. Currently, reciprocating submersible electric pumps are widely used in ambient temperature wells in major oilfields. However, for heavy oil wells, reciprocating submersible electric pumps still face many technical challenges.

[0004] The power unit of a reciprocating submersible electric pump is a submersible linear motor, which is a cylindrical linear motor. The mover is located at the center of the cylinder and moves back and forth along the axis of the cylinder. The stator is annular and is fitted around the mover. To ensure that the movement of the mover does not wear down the stator, a sliding guide sleeve is installed on the stator to limit the radial movement of the mover.

[0005] In summary, current standard submersible linear motor sliding guide sleeves for ambient temperature wells are generally made of cemented carbide, with a small interference fit between the guide sleeve and the guide sleeve seat for fixation. This structure has been successfully applied in ambient temperature wells; however, in high-temperature wells, this structure presents unresolved problems:

[0006] Hard alloy is a brittle material with a very small coefficient of thermal expansion; the guide sleeve seat is generally made of stainless steel, which has a larger coefficient of thermal expansion. In high-temperature wells, due to the large temperature difference between the ambient temperature and the surface temperature, if the interference fit between the guide sleeve seat and the sliding guide sleeve is small, there will be a large gap between the downhole guide sleeve seat and the sliding guide sleeve, causing the sliding guide sleeve to lose its fixation and weakening its radial limiting effect on the mover; if the interference fit between the guide sleeve seat and the sliding guide sleeve is large, the internal stress of the sliding guide sleeve will be too high, making it prone to breakage.

[0007] There are currently no submersible electric pumps suitable for high-temperature heavy oil wells.

[0008] In summary, how to develop a submersible electric pump suitable for high-temperature heavy oil wells is a problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0009] The purpose of this invention is to provide a sliding guide sleeve that is suitable for high-temperature heavy oil wells. This sliding guide sleeve can prevent the sliding guide sleeve from losing its fixing and limiting function in high-temperature environments, and avoid excessive internal stress, thereby reducing the risk of breakage. Another purpose of this invention is to provide a high-temperature heavy oil well submersible linear motor that includes the above-mentioned sliding guide sleeve, which has the same beneficial effects as the sliding guide sleeve.

[0010] To solve the above-mentioned technical problems, the present invention provides the following technical solution:

[0011] A sliding guide sleeve for a high-temperature heavy oil well submersible linear motor includes a sliding guide sleeve body, a guide sleeve seat fitted on the outside of the sliding guide sleeve body, and a guide sleeve retaining ring fitted between the guide sleeve seat and the sliding guide sleeve body. The thermal expansion coefficient of the guide sleeve retaining ring is less than that of the guide sleeve seat and greater than that of the sliding guide sleeve body. The elastic modulus of the guide sleeve retaining ring is less than that of the sliding guide sleeve body and the guide sleeve seat. The guide sleeve seat and the guide sleeve retaining ring, as well as the guide sleeve retaining ring and the sliding guide sleeve body, are both interference fits.

[0012] Optionally, the guide sleeve seat and the guide sleeve retaining ring have a large interference fit, and the guide sleeve retaining ring and the sliding guide sleeve body have a small interference fit.

[0013] Optionally, the guide sleeve retaining ring includes multiple layers of guide sleeve retaining rings that are sequentially interference-fitted.

[0014] Optionally, the guide sleeve seat and the sliding guide sleeve body are made of stainless steel and hard alloy, respectively, and the guide sleeve retaining ring is made of titanium alloy.

[0015] Optionally, the first end of the guide sleeve seat has a first stop, the first end face of the sliding guide sleeve body and the first end face of the guide sleeve retaining ring are flush, and the first end face of the sliding guide sleeve body and the first end face of the guide sleeve retaining ring abuts against the first stop.

[0016] Optionally, the second end of the guide sleeve retaining ring has a second stop, and the second end face of the sliding guide sleeve body abuts against the second stop.

[0017] Optionally, the second end of the sliding guide sleeve body has a notch that mates with the second stop, and the second stop abuts against the notch.

[0018] Optionally, the second end face of the guide sleeve seat, the second end face of the guide sleeve retaining ring, and the second end face of the sliding guide sleeve body are flush.

[0019] The present invention also provides a high-temperature heavy oil well submersible linear motor, including a sliding guide sleeve, wherein the sliding guide sleeve is specifically the sliding guide sleeve described in any of the above claims.

[0020] The sliding guide sleeve provided by this invention includes a sliding guide sleeve body, a guide sleeve seat, and a guide sleeve retaining ring. The sliding guide sleeve body is located on the inner side, and the guide sleeve seat is fitted onto the outer side of the sliding guide sleeve body. The guide sleeve retaining ring is fitted between the guide sleeve seat and the sliding guide sleeve body. The installation process is as follows: first, the guide sleeve retaining ring is fitted onto the sliding guide sleeve body, and then the guide sleeve seat is fitted onto the former.

[0021] The coefficient of thermal expansion of the guide sleeve retaining ring is less than that of the guide sleeve seat and greater than that of the sliding guide sleeve body. The expansion amount of the guide sleeve retaining ring is less than that of the guide sleeve seat and greater than that of the sliding guide sleeve body.

[0022] The guide sleeve retaining ring has a small elastic modulus and a large deformation under stress. It is sandwiched between the guide sleeve seat and the sliding guide sleeve body, resulting in a small amount of compression on the guide sleeve seat and the sliding guide sleeve body, thus reducing the internal stress of both structures.

[0023] The guide sleeve seat and the guide sleeve retaining ring, as well as the guide sleeve retaining ring and the sliding guide sleeve body, are all interference fits. Under high temperature conditions, there is still sufficient interference between the guide sleeve seat and the guide sleeve retaining ring, and the structure will not loosen.

[0024] The interference fit between the guide sleeve retaining ring and the sliding guide sleeve body decreases, reaching a critical state of interference, and remains a relatively fixed connection that will not loosen. Under normal temperature conditions, the internal stress of the sliding guide sleeve body is small, which can prevent excessive internal stress of the sliding guide sleeve body at normal temperature and make it less prone to breakage.

[0025] The sliding guide sleeve of the submersible linear motor for high-temperature heavy oil wells provided by this invention can be applied to high-temperature heavy oil wells. It can ensure that the limiting function and self-fixation of the sliding guide sleeve body are not affected in high-temperature environments, and also ensure that the sliding guide sleeve body will not break due to excessive stress in surface environments.

[0026] This invention also provides a high-temperature heavy oil well submersible linear motor, including a sliding guide sleeve, which is specifically any of the sliding guide sleeves described above. Since the aforementioned sliding guide sleeve has the above-mentioned technical effects, the high-temperature heavy oil well submersible linear motor having this sliding guide sleeve should also have the corresponding technical effects. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 This is a schematic diagram of the assembly structure of the sliding guide sleeve provided in a specific embodiment of the present invention.

[0029] The following labels are shown in the attached diagram:

[0030] Guide sleeve seat 1, guide sleeve retaining ring 2, sliding guide sleeve body 3, first stop 11, second stop 21. Detailed Implementation

[0031] The core of this invention is to provide a sliding guide sleeve that is applicable to high-temperature heavy oil wells. This sliding guide sleeve can prevent the sliding guide sleeve from losing its fixing and limiting function in high-temperature environments, and avoid excessive internal stress, thus reducing the risk of breakage. Another core aspect of this invention is to provide a high-temperature heavy oil well submersible linear motor that includes the above-mentioned sliding guide sleeve, which has the same beneficial effects as the sliding guide sleeve.

[0032] 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.

[0033] Please refer to Figure 1 , Figure 1 This is a schematic diagram of the assembly structure of the sliding guide sleeve provided in a specific embodiment of the present invention.

[0034] In one specific embodiment, the sliding guide sleeve of the high-temperature heavy oil well submersible linear motor provided by the present invention includes a sliding guide sleeve body 3, a guide sleeve seat 1 fitted on the outside of the sliding guide sleeve body 3, and a guide sleeve retaining ring 2 fitted between the guide sleeve seat 1 and the sliding guide sleeve body 3. The thermal expansion coefficient of the guide sleeve retaining ring 2 is less than that of the guide sleeve seat 1 and greater than that of the sliding guide sleeve body 3. The elastic modulus of the guide sleeve retaining ring 2 is less than that of the sliding guide sleeve body 3 and the elastic modulus of the guide sleeve seat 1. The guide sleeve seat 1 and the guide sleeve retaining ring 2, as well as the guide sleeve retaining ring 2 and the sliding guide sleeve body 3, are both interference fits.

[0035] In the above structure, the sliding guide sleeve includes a sliding guide sleeve body 3, a guide sleeve seat 1, and a guide sleeve retaining ring 2. The sliding guide sleeve body 3 is located on the inner side, and the guide sleeve seat 1 is fitted onto the outer side of the sliding guide sleeve body 3. The guide sleeve retaining ring 2 is fitted between the guide sleeve seat 1 and the sliding guide sleeve body 3. The installation process is as follows: first, the guide sleeve retaining ring 2 is fitted onto the sliding guide sleeve body 3, and then the guide sleeve seat 1 is fitted onto the former.

[0036] It should be noted that the coefficient of thermal expansion of the guide sleeve retaining ring 2 is less than that of the guide sleeve seat 1 and greater than that of the sliding guide sleeve body 3. The expansion amount of the guide sleeve retaining ring 2 is less than that of the guide sleeve seat 1 and greater than that of the sliding guide sleeve body 3.

[0037] The elastic modulus of the guide sleeve retaining ring 2 mentioned above is less than that of the elastic modulus of the sliding guide sleeve body 3 and the elastic modulus of the guide sleeve seat 1. This means that the elastic modulus of the guide sleeve retaining ring 2 is small, the deformation under stress is large, and it is sandwiched between the guide sleeve seat 1 and the sliding guide sleeve body 3. It exerts less pressure on the guide sleeve seat 1 and the sliding guide sleeve body 3, thereby reducing the internal stress of both structures.

[0038] The guide sleeve seat 1 and the guide sleeve retaining ring 2, as well as the guide sleeve retaining ring 2 and the sliding guide sleeve body 3, are all interference fits. Under high temperature environment, there is still enough interference between the guide sleeve seat 1 and the guide sleeve retaining ring 2, and the structure will not loosen.

[0039] The interference fit between the guide sleeve retaining ring 2 and the sliding guide sleeve body 3 decreases, reaching a critical state of interference fit. It remains a relatively fixed connection and will not loosen. Under normal temperature conditions, the internal stress of the sliding guide sleeve body 3 is small, which can prevent excessive internal stress of the sliding guide sleeve body 3 under normal temperature conditions and make it less prone to breakage.

[0040] The sliding guide sleeve of the submersible linear motor for high-temperature heavy oil wells provided by this invention can be applied to high-temperature heavy oil wells. It can ensure that the limiting function and self-fixation of the sliding guide sleeve body are not affected in high-temperature environments, and also ensure that the sliding guide sleeve body will not break due to excessive stress in surface environments.

[0041] The above-mentioned sliding guide sleeve is only a preferred solution and is not limited to it. Based on this, targeted adjustments can be made according to actual needs to obtain different implementation methods. The guide sleeve seat 1 and the guide sleeve retaining ring 2 are in a large interference fit to ensure that there is still sufficient interference between the two in a high-temperature environment and the structure will not loosen.

[0042] The guide sleeve retaining ring 2 and the sliding guide sleeve body 3 are in a small interference fit with a small amount of interference. Under high temperature conditions, the two are in a critical interference state to avoid excessive internal stress in the sliding guide sleeve body 3 at room temperature.

[0043] To further optimize the above technical solution, those skilled in the art can make several modifications to the specific implementation method according to different specific situations. The number of layers of the guide sleeve retaining ring 2 can be one, two, or more, such as three layers. In this case, the guide sleeve retaining ring 2 includes three layers of guide sleeve sub-retaining rings that are sequentially interference-fitted. The fit between the guide sleeve sub-retaining rings and the guide sleeve seat 1 and the sliding guide sleeve body 3 can be adjusted by the guide sleeve sub-retaining rings, making it more convenient to use. The coefficient of thermal expansion and elastic modulus of the guide sleeve sub-retaining rings are not limited, and there is still an interference fit between the guide sleeve sub-retaining rings under high temperature conditions, so the structure will not loosen.

[0044] In the embodiments, the guide sleeve seat 1 and the sliding guide sleeve body 3 can be made of the same materials as the well guide sleeve seat and the sliding guide sleeve body 3 at room temperature, such as stainless steel and hard alloy respectively, which is low cost.

[0045] The guide sleeve retaining ring 2 is made of titanium alloy, which has a small modulus and a smaller coefficient of thermal expansion than the guide sleeve seat 1 and a larger coefficient of thermal expansion than the sliding guide sleeve body 3. It is suitable for use with stainless steel and hard alloy, and is flexible and convenient to use.

[0046] In another more reliable embodiment, based on any of the above embodiments, the first end of the guide sleeve seat 1 has a first stop 11, the first end face of the sliding guide sleeve body 3 and the first end face of the guide sleeve guard ring 2 are flush, the first end face of the sliding guide sleeve body 3 and the first end face of the guide sleeve guard ring 2 abuts against the first stop 11, the first stop 11 limits the sliding guide sleeve body 3 and the first end face of the guide sleeve guard ring 2, limiting the sliding guide sleeve body 3 to prevent axial displacement to one side of the first end face, thus preventing the sliding guide sleeve body 3 from losing its limit on one side.

[0047] Based on the above specific embodiments, the guide sleeve retaining ring 2 has a second stop 21 at its second end relative to the first stop 11. The second end face of the sliding guide sleeve body 3 abuts against the second stop 21. The second stop 21 limits the second end face of the sliding guide sleeve body 3, preventing the sliding guide sleeve body 3 from axially displacing to one side of the second end face, thus preventing the other side of the sliding guide sleeve body 3 from losing its limit.

[0048] Optionally, the first stop 11 and the second stop 21 work together to limit the axial displacement of the sliding guide sleeve body 3.

[0049] Based on the above specific embodiments, the second end of the sliding guide sleeve body 3 has a notch that matches the second stop 21. The second stop 21 abuts against the notch, making the position of the second stop 21 and the sliding guide sleeve body 3 more precise. The second stop 21 has a simple structure and is easy to process.

[0050] Based on the above specific embodiments, the second end face of the guide sleeve seat 1, the second end face of the guide sleeve guard ring 2, and the second end face of the sliding guide sleeve body 3 are flush, resulting in a more complete, flat, and aesthetically pleasing overall structure that is less prone to snagging and easier to connect.

[0051] Based on the sliding guide sleeve provided in the above embodiments, the present invention also provides a high-temperature heavy oil well submersible linear motor, which includes a sliding guide sleeve, wherein the sliding guide sleeve is any type of sliding guide sleeve in the above embodiments. Since the high-temperature heavy oil well submersible linear motor uses the sliding guide sleeve in the above embodiments, the beneficial effects of the high-temperature heavy oil well submersible linear motor are described in the above embodiments. The structures of other parts of the high-temperature heavy oil well submersible linear motor are described in the prior art and will not be repeated here.

[0052] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0053] The above provides a detailed description of the high-temperature heavy oil well submersible linear motor and its sliding guide sleeve provided by this invention. Specific examples have been used to illustrate the principles and implementation methods of this invention. The descriptions of the embodiments above are merely for the purpose of helping to understand the method and core ideas of this invention. It should be noted that those skilled in the art can make various improvements and modifications to this invention without departing from its principles, and these improvements and modifications also fall within the protection scope of the claims of this invention. Therefore, this invention is not limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A sliding guide sleeve for a high-temperature heavy oil well submersible linear motor, characterized in that, The system includes a sliding guide sleeve body (3), a guide sleeve seat (1) fitted around the outside of the sliding guide sleeve body (3), and a guide sleeve retaining ring (2) fitted between the guide sleeve seat (1) and the sliding guide sleeve body (3). The guide sleeve seat (1) is made of stainless steel, the sliding guide sleeve body (3) is made of hard alloy, and the guide sleeve retaining ring (2) is made of titanium alloy. The thermal expansion coefficient of the guide sleeve retaining ring (2) is less than that of the guide sleeve seat (1) and greater than that of the sliding guide sleeve body (3). The elastic modulus of the guide sleeve retaining ring (2) is less than that of the sliding guide sleeve body (3) and the elastic modulus of the guide sleeve seat (1). The guide sleeve seat (1) and the guide sleeve retaining ring (2) are positioned relative to each other, and the guide sleeve retaining ring (2) and the sliding guide sleeve body are positioned relative to each other. All three parts (3) are interference fits. The guide sleeve seat (1) and the guide sleeve retaining ring (2) are large interference fits, and the guide sleeve retaining ring (2) and the sliding guide sleeve body (3) are small interference fits. The first end of the guide sleeve seat (1) has a first stop (11). The first end faces of the sliding guide sleeve body (3) and the guide sleeve retaining ring (2) are flush. The first end faces of the sliding guide sleeve body (3) and the guide sleeve retaining ring (2) abut against the first stop (11). The second end of the guide sleeve retaining ring (2) has a second stop (21). The second end face of the sliding guide sleeve body (3) abuts against the second stop (21). The first stop (11) and the second stop (21) work together to restrict the sliding guide sleeve body (3) from axial displacement.

2. The sliding guide sleeve according to claim 1, characterized in that, The guide sleeve retaining ring (2) includes multiple layers of guide sleeve retaining rings that are sequentially interference-fitted.

3. The sliding guide sleeve according to claim 1, characterized in that, The second end of the sliding guide sleeve body (3) has a notch that matches the second stop (21), and the second stop (21) abuts against the notch.

4. The sliding guide sleeve according to claim 3, characterized in that, The second end face of the guide sleeve seat (1), the second end face of the guide sleeve guard ring (2), and the second end face of the sliding guide sleeve body (3) are flush.

5. A high-temperature heavy oil well submersible linear motor, comprising a sliding guide sleeve, characterized in that, The sliding guide sleeve is specifically the sliding guide sleeve described in any one of claims 1 to 4.

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