Lantern type centralizer at bottom of submersible electric screw pump unit

Abstract

A lantern type centralizer at the bottom of a submersible electric screw pump unit relates to the technical field of screw pump tools and comprises a centralizing sleeve and a guide body which are coaxially arranged in parallel, a lantern centralizing component is connected between the centralizing sleeve and the guide body, the guide body is arranged in a sliding manner along the axial direction through the centralizing sleeve, and the lantern centralizing component is further arranged in a telescopic manner along the radial direction. The centralizer solves the problems that in the prior art, the outer diameter of a rigid body of a centralizer cannot be changed, the centralizer is of a fixed size, and vibration of a unit in the working process cannot be relieved; the bottom elastic centralizer is complex in structure, large in machining difficulty and high in machining cost.

Description

Technical Field

[0001] The utility model relates to the technical field of screw pump tools, in particular to a lantern-type centralizer at the bottom of a submersible electric screw pump unit. Background Art

[0002] There are many types of bottom centralizers for submersible pump units, mainly including integrated fixed bottom centralizer (outer diameter is fixed at 118mm, without telescopic function), integrated lantern-type centralizer (outer diameter is fixed at 118mm, without telescopic function), bottom elastic centralizer (with four sets of elastic centralizing friction blocks), etc.

[0003] The prior art discloses a patent CN200978631Y, which consists of a short section, a spiral stabilizer, and a close-pitch nut. A spiral stabilizer is installed on the short section, and a close-pitch nut is locked at the lower end. The spiral stabilizer can rotate flexibly between the locked close-pitch nut and the shoulder of the short section, and there is a spiral flow channel on it. Due to the existence of the spiral flow channel, the spiral stabilizer generates a circumferential rotation force due to the impact of the oil flow during the rotation of the sucker rod, causing the spiral stabilizer to rotate. The spiral stabilizer and the inner wall of the oil pipe are evenly rubbed, preventing the sucker rod from eccentric wear. Since a special sucker rod short section spiral stabilizer for screw pump wells adopts a tapered thread connection, it can also prevent breakage.

[0004] As the existing devices including the above patents are used, the shortcomings of the technology are gradually exposed, which are mainly manifested in the following aspects:

[0005] First, the outer diameter of the rigid body of the integrated fixed bottom centralizer and the integrated lantern-type bottom centralizer cannot be changed and is a fixed size. Therefore, there must be a gap between them and the casing, otherwise they cannot be lowered into the casing. Therefore, these two types of centralizers cannot truly play the role of unit straightening and cannot reduce the vibration of the unit during operation.

[0006] Second, the friction block of the bottom elastic stabilizer is similar to the friction block of the oil well packer, which can effectively straighten the unit and reduce the vibration of the unit during operation. However, this type of stabilizer has a complex structure, is difficult to process, and has a high processing cost.

[0007] In summary, the prior art obviously has inconveniences and defects in practical use, so it is necessary to improve it. Utility Model Content

[0008] In view of the defects in the prior art, the utility model solves the problems that the outer diameter of the rigid body of the stabilizer in the traditional technology cannot be changed and is of fixed size, which cannot reduce the vibration of the unit during operation; and the bottom elastic stabilizer has a complex structure, is difficult to process, and has a high processing cost.

[0009] In order to solve the above problems, the utility model provides the following technical solutions:

[0010] The lantern-type centralizer at the bottom of a submersible electric screw pump unit comprises a centralizing sleeve and a guide body which are coaxially and parallelly arranged. A lantern centralizing assembly is connected between the centralizing sleeve and the guide body. The guide body is axially slidable through the centralizing sleeve. The lantern centralizing assembly is also radially telescopically arranged.

[0011] As an optimized solution, the lantern centralizer includes a plurality of lantern connecting pieces arranged along the circumferential direction, and two ends of the plurality of lantern connecting pieces are correspondingly fixedly connected to the centralizing sleeve and the guide body.

[0012] As an optimized solution, the lantern connecting piece is extended in the axial direction.

[0013] As an optimized solution, the lantern connecting piece is arranged in an arc shape, and the convex surface of the lantern connecting piece is arranged outward.

[0014] As an optimized solution, a gap is provided in the area between adjacent lantern connecting pieces.

[0015] As an optimized solution, a plurality of flow grooves are axially arranged on the peripheral wall of the guide body.

[0016] As an optimized solution, two ends of the circulation groove pass through two ends of the guide body.

[0017] As an optimized solution, the flow groove is arranged to extend in the axial direction.

[0018] As an optimized solution, the number of the flow slots is 5.

[0019] As an optimized solution, a connecting pipe is coaxially fixedly connected to the other end of the straightening sleeve.

[0020] Compared with the prior art, the beneficial effects of the utility model are:

[0021] The lantern-type bottom centralizer has the advantages of the bottom elastic centralizer, with a simple structure and easy processing and manufacturing. The key part of the centralizer is the elastic lantern, which can be supported on the wall of the casing after being lowered into the oil well, which can effectively play the role of unit centralization, and can also reduce the vibration of the unit during operation, thus extending the service life of the unit;

[0022] The guide body also plays a role in straightening, reducing the swing amplitude of the lantern body, reducing its deformation amplitude, and extending the service life of the lantern body;

[0023] The size of the guide body is determined by the size of the casing. Five flow grooves are designed on the outer circle of the guide body to facilitate the circulation of well fluid.

[0024] The lantern body is an elastic element. After being lowered into the oil well, it can support the wall of the casing, effectively play the role of unit straightening, and can also reduce the vibration of the unit during operation, thus extending the service life of the unit. The outer circle of the guide body is processed with 5 flow grooves, which is used to facilitate the circulation of well fluid and also plays a certain straightening role. Compared with the bottom straightener of the ordinary submersible electric pump, it has a simple structure, low processing cost, good straightening effect on the unit, can reduce the vibration of the unit, and extend the service life of the unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the specific implementation of the utility model or the technical solution in the prior art, the following is a brief introduction to the drawings required for the specific implementation or the prior art description. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, each element or part is not necessarily drawn according to the actual scale.

[0026] Figure 1 It is a structural schematic diagram of the utility model.

[0027] In the figure: 1-rightening sleeve; 2-guide body; 3-lantern connecting piece; 4-spacer; 5-circuit slot; 6-connecting pipe. DETAILED DESCRIPTION

[0028] The following embodiments of the technical solution of the utility model are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the utility model, and are therefore only used as examples, and cannot be used to limit the protection scope of the utility model.

[0029] like Figure 1 As shown, the lantern-type centralizer at the bottom of the submersible electric screw pump unit includes a centralizing sleeve 1 and a guide body 2 which are coaxially arranged in parallel. A lantern centralizing assembly is connected between the centralizing sleeve and the guide body 2. The guide body 2 is axially slidable through the centralizing sleeve, and the lantern centralizing assembly is also radially telescopically arranged.

[0030] The lantern centralizer includes a lantern connecting piece 3 made of Q235D, with a total of 5 pieces. Both ends of the lantern connecting piece 3 are firmly welded to the centralizing sleeve 1 and the guide body 2 by argon arc welding.

[0031] The lantern connecting piece 3 is extended along the axial direction.

[0032] The lantern connecting piece 3 is arranged in an arc shape, and the convex surface of the lantern connecting piece 3 is arranged outward.

[0033] The area between adjacent lantern connecting pieces 3 is provided with a gap 4 .

[0034] A plurality of flow grooves 5 are axially arranged on the peripheral wall of the guide body 2 .

[0035] Both ends of the flow groove 5 penetrate through both ends of the guide body 2 .

[0036] The flow groove 5 is arranged to extend in the axial direction.

[0037] The number of the flow slots 5 is five.

[0038] The other end of the straightening sleeve 1 is coaxially fixed with a connecting pipe 6 .

[0039] The working principle of this device is:

[0040] The lantern-type bottom centralizer has the advantages of the bottom elastic centralizer, with a simple structure and easy processing and manufacturing. The key part of the centralizer is the elastic lantern, which can be supported on the wall of the casing after being lowered into the oil well, which can effectively play the role of unit centralization, and can also reduce the vibration of the unit during operation, thus extending the service life of the unit;

[0041] The guide body 2 also plays a role in straightening, reducing the swing amplitude of the lantern body, reducing its deformation amplitude, and extending the service life of the lantern body;

[0042] The size of the guide body 2 is determined by the size of the casing. Five flow grooves 5 are designed on the outer circle of the guide body 2 to facilitate the flow of well fluid.

[0043] The lantern body is an elastic element. After being lowered into the oil well, it can support the wall of the casing, effectively play the role of unit straightening, and can also reduce the vibration of the unit during operation, thus extending the service life of the unit. Five flow grooves 5 are processed on the outer circle of the guide body 2, which are used to facilitate the circulation of well fluid and also play a certain straightening role. Compared with the bottom straightener of the ordinary submersible electric pump, it has a simple structure, low processing cost, good straightening effect on the unit, can reduce the vibration of the unit, and extend the service life of the unit.

[0044] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents. These modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the utility model, and they should all be included in the scope of the claims and specification of the utility model.

Claims

1. Lantern-type centralizer at the bottom of the submersible electric screw pump unit, characterized by: The invention comprises a straightening sleeve (1) and a guide body (2) which are coaxially arranged in parallel, wherein a lantern straightening assembly is connected between the straightening sleeve and the guide body (2), the guide body (2) is axially slidable through the straightening sleeve, and the lantern straightening assembly is also radially telescopically arranged.

2. The lantern-type centralizer at the bottom of the submersible electric screw pump unit according to claim 1, characterized in that: The lantern centralizer comprises a plurality of lantern connecting pieces (3) arranged along the circumferential direction, and the two ends of the plurality of lantern connecting pieces (3) are correspondingly fixedly connected to the centralizing sleeve (1) and the guide body (2).

3. The lantern-type centralizer at the bottom of the submersible electric screw pump unit according to claim 2, characterized in that: The lantern connecting piece (3) is arranged to extend in the axial direction.

4. The lantern-type centralizer at the bottom of the submersible electric screw pump unit according to claim 2, characterized in that: The lantern connecting piece (3) is arranged in an arc shape, and the convex surface of the lantern connecting piece (3) is arranged outward.

5. The lantern-type centralizer at the bottom of the submersible electric screw pump unit according to claim 2, characterized in that: A spacer (4) is provided in the area between adjacent lantern connecting pieces (3).

6. The lantern-type centralizer at the bottom of the submersible electric screw pump unit according to claim 1, characterized in that: A plurality of flow grooves (5) are arranged on the peripheral wall of the guide body (2) along the axial direction.

7. The lantern-type centralizer at the bottom of the submersible electric screw pump unit according to claim 6, characterized in that: Both ends of the circulation groove (5) penetrate through both ends of the guide body (2).

8. The lantern-type centralizer at the bottom of the submersible electric screw pump unit according to claim 6, characterized in that: The flow groove (5) is arranged to extend in the axial direction.

9. The lantern-type centralizer at the bottom of the submersible electric screw pump unit according to claim 6, characterized in that: The number of the circulation slots (5) is 5.

10. The lantern-type centralizer at the bottom of the submersible electric screw pump unit according to claim 1, characterized in that: The other end of the straightening sleeve is coaxially fixedly connected with a connecting pipe (6).

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