High-strength wear-resistant plunger

Abstract

The utility model discloses a high-strength wear-resistant plunger, which relates to the technical field of petroleum drilling and comprises a plunger base body, one end of the plunger base body is used for being connected with a hydraulic part, and the other end of the plunger base body is provided with a plunger wear-resistant belt. The plunger wear-resistant belt comprises a bonding layer and a wear-resistant body; one surface of the bonding layer is bonded and fixed to the end face of the end, away from the hydraulic part, of the plunger base body. The number of the wear-resisting bodies is multiple, the wear-resisting bodies are of cone structures, the narrow head ends of the wear-resisting bodies are embedded and bonded on the surface, away from the plunger base body, of the bonding layer, and the wide head ends of the wear-resisting bodies are exposed out of the surface, away from the plunger base body, of the bonding layer and are flush with the surface; and the end surfaces of the wide head ends of the plurality of wear-resistant bodies are combined to form a wear-resistant surface. The wear-resistant body of the cone structure in a special design form is connected with the plunger base body through the bonding layer, and the shape characteristic that one end of the cone structure is wide and the other end of the cone structure is narrow is utilized, so that the area of a wear-resistant surface is increased, the wear resistance is improved, and the bonding strength is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of oil drilling, and more particularly to a high-strength wear-resistant plunger. Background Art

[0002] Variable diameter centralizers are commonly used to accommodate changes in wellbore diameter during directional drilling, especially in large horizontal sections, reducing tripping times. These centralizers are designed with multiple plungers, a crucial component for maintaining wellbore stability. The extended plungers provide both inclination stabilization and support. When activated, the plungers expand to their desired size, creating friction with the wellbore wall. Therefore, the plunger surface must possess high resistance to wear and erosion.

[0003] In the past, plungers were mainly made of welded PDC composite sheets (such as Figure 1 The black block in the middle shows the blank area is the bonding layer) or the sintered bulk polycrystalline (such as Figure 2 The black block in the middle shows that the blank area is the bonding layer) for wear protection. The PDC tooth layout has a limited coverage area. Since all parts of the block polycrystalline except the exposed surface need to be inlaid with powder to ensure strength, it is still impossible to achieve full coverage of the plunger surface. Figure 3 The cross-sectional structure provided shows that due to the large exposed area of ​​the bonding layer (i.e., the powder) and the poor wear resistance of the powder, when the powder is worn away, the PDC composite sheet or sintered block loses its bonding strength and easily falls off. This leads to severe abrasion of the plunger, making it difficult to operate for a long time.

[0004] Therefore, how to provide a plunger that can improve adhesion and thus improve wear resistance is a problem that those skilled in the art urgently need to solve. Utility Model Content

[0005] In view of this, the utility model provides a high-strength wear-resistant plunger, aiming to solve the above technical problems.

[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0007] A high-strength wear-resistant plunger, comprising: a plunger base, one end of the plunger base is used to connect with a hydraulic component, and the other end has a plunger wear-resistant belt; the plunger wear-resistant belt comprises: an adhesive layer and a wear-resistant body;

[0008] One surface of the bonding layer is bonded and fixed to an end surface of the plunger base away from the hydraulic component;

[0009] There are multiple wear-resistant bodies, and the wear-resistant bodies are of conical structure. The narrow head end of the wear-resistant body is embedded and bonded to a surface of the bonding layer away from the plunger base, and the wide head end of the wear-resistant body is exposed outside the surface of the bonding layer away from the plunger base and is flush with the surface. The wide head ends of the multiple wear-resistant bodies are compactly arranged so that the end faces of the wide head ends of the multiple wear-resistant bodies are combined to form a wear-resistant surface.

[0010] Through the above technical solution, the utility model adopts a specially designed cone-shaped wear-resistant body to be connected to the plunger base through an adhesive layer. The characteristic of this structure is that it utilizes the shape characteristics of the cone structure that is wide at one end and narrow at the other end. When the wide ends of multiple wear-resistant bodies are combined as close as possible to form a wear-resistant surface, due to the narrowness of the other end, there is still a large adhesive layer filling gap between adjacent wear-resistant bodies. In this way, the wear-resistant surface formed by the wide ends of the multiple wear-resistant bodies has a small adhesive layer exposed gap, and the adhesive layer can form a good adhesive force with the side wall of the wear-resistant body. Therefore, due to the compact arrangement of multiple wear-resistant bodies, the wear resistance is improved and the bonding strength is guaranteed, and the wear-resistant body will not fall off due to exposure of the adhesive layer and excessive wear.

[0011] Preferably, in the above-mentioned high-strength wear-resistant plunger, the cone sidewall surface of the wear-resistant body has friction lines. The friction lines can increase the surface roughness of the cone and improve the bonding strength with the bonding layer.

[0012] Preferably, in the above-mentioned high-strength wear-resistant plunger, the friction pattern is a spiral pattern. The spiral pattern has a better effect of increasing the roughness of the cone surface.

[0013] Preferably, in the above-mentioned high-strength wear-resistant plunger, the wear-resistant surface is formed into an arc surface, which can meet the friction requirements.

[0014] Preferably, in the above-mentioned high-strength wear-resistant plunger, the wear-resistant body is heat-stable diamond polycrystalline, and the bonding layer is a metal layer formed by sintering pre-alloyed matrix powder.

[0015] Preferably, in the above-mentioned high-strength wear-resistant plunger, the heat-stable diamond polycrystals are sintered and bonded to the pre-alloyed matrix powder by powder metallurgy technology to form an integrated structure. The heat-stable diamond polycrystals are firmly bonded to the pre-alloyed matrix powder by powder metallurgy and embedded in the high-strength wear-resistant belt.

[0016] Preferably, in the above-mentioned high-strength wear-resistant plunger, the pre-alloyed matrix powder includes a mixed powder of any one or more of W, WC, Fe, Ni and Cr.

[0017] Preferably, in the above-mentioned high-strength wear-resistant plunger, the wear-resistant body is a conical structure.

[0018] Preferably, in the above-mentioned high-strength wear-resistant plunger, the end surface of the plunger base for connecting with the bonding layer has a concave-convex tooth surface. The design of the concave-convex tooth surface can increase the bonding area between the plunger base and the bonding layer and improve the bonding stability.

[0019] It can be seen from the above technical solution that compared with the existing technology, the utility model discloses a high-strength wear-resistant plunger. Through the specially designed spherical conical teeth heat-stable diamond polycrystal, it can not only ensure the bonding strength of the polycrystal and the matrix powder, but also achieve a wear-resistant polycrystal coverage rate of ≥90% on the outer arc surface of the plunger, which greatly improves the erosion resistance and wear resistance of the plunger wear-resistant belt. Compared with the plunger welded with composite sheets and conventional block polycrystal fired, it has higher erosion resistance and wear resistance, and can effectively solve the problem of early failure of the plunger arc surface shrinkage. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are merely embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0021] Figure 1 The accompanying drawing is a PDC composite sheet welding arrangement diagram in the prior art;

[0022] Figure 2 The accompanying drawing is a conventional planar polycrystalline sintering planar arrangement diagram in the prior art;

[0023] Figure 3 The accompanying drawing is a cross-sectional view of a plunger head using a PDC composite sheet in the prior art;

[0024] Figure 4 The accompanying drawing is a schematic diagram of the high-strength wear-resistant plunger provided by the utility model;

[0025] Figure 5 The accompanying drawing is a planar arrangement diagram of the wear-resistant belt of the high-strength wear-resistant plunger provided by the present invention;

[0026] Figure 6 The accompanying drawing is a cross-sectional view of the wear-resistant belt of the high-strength wear-resistant plunger provided by the utility model;

[0027] Figure 7 The accompanying drawing is a schematic diagram of the wear-resistant body provided by the utility model;

[0028] Figure 8 The accompanying drawing is a cross-sectional view of the sintered high-strength wear-resistant plunger provided by the present invention.

[0029] in:

[0030] 1- plunger base;

[0031] 11-concave and convex tooth surface;

[0032] 2- plunger wear zone;

[0033] 21-adhesive layer; 22-wear-resistant body; 221-narrow head end; 222-wide head end; 223-friction pattern;

[0034] 3-Firing the mold;

[0035] 31-firing notch; 32-arc-shaped bottom surface. DETAILED DESCRIPTION

[0036] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0037] See attached Figure 4 To the attached Figure 7 The embodiment of the utility model discloses a high-strength wear-resistant plunger, comprising: a plunger base 1, one end of the plunger base 1 is used to connect with the hydraulic component, and the other end has a plunger wear-resistant belt 2; the plunger wear-resistant belt 2 includes: an adhesive layer 21 and a wear-resistant body 22;

[0038] One surface of the bonding layer 21 is bonded and fixed to the end surface of the plunger base 1 away from the hydraulic component;

[0039] There are multiple wear-resistant bodies 22, and the wear-resistant bodies 22 are conical structures. The narrow head end 221 of the wear-resistant body 22 is embedded and bonded to a surface of the bonding layer 21 away from the plunger base 1, and the wide head end 222 of the wear-resistant body 22 is exposed outside the surface of the bonding layer 21 away from the plunger base 1 and is flush with the surface. The wide head ends 222 of the multiple wear-resistant bodies 22 are compactly arranged so that the end faces of the wide head ends 222 of the multiple wear-resistant bodies 22 are combined to form a wear-resistant surface.

[0040] In order to further optimize the above technical solution, the cone side wall surface of the wear-resistant body 22 has friction lines 223.

[0041] In this embodiment, the friction pattern 223 is a spiral pattern. In other embodiments, the friction pattern 223 can also be other types of grooves. During processing, the spiral or other types of grooves are cut by laser.

[0042] In order to further optimize the above technical solution, the wear-resistant body 22 is heat-stable diamond polycrystalline, and the bonding layer 21 is a metal layer formed by sintering pre-alloyed matrix powder.

[0043] In order to further optimize the above technical solution, heat-stable diamond polycrystals are sintered and bonded with pre-alloyed matrix powder through powder metallurgy technology to form an integrated structure.

[0044] In this embodiment, the pre-alloyed matrix powder includes a mixed powder of any one or more of W, WC, Fe, Ni and Cr.

[0045] In order to further optimize the above technical solution, the wear-resistant body 22 has a conical structure.

[0046] In order to further optimize the above technical solution, the end surface of the plunger base 1 for connecting with the adhesive layer 21 has a concave-convex tooth surface 11.

[0047] The high strength wear-resistant plunger provided in this embodiment is fired by Figure 8 The firing mold 3 shown has a firing notch 31 , and the bottom surface of the firing notch 31 is an arc-shaped bottom surface 32 .

[0048] During firing, the conical heat-stable diamond polycrystals are first placed on the curved bottom surface 32. To improve stability, the heat-stable diamond polycrystals can be adhered to the curved bottom surface 32 using a point-bonding method. The heat-stable diamond polycrystals are arranged compactly or positioned according to a specific pattern. Pre-alloyed matrix powder is then added, covering the heat-stable diamond polycrystals. Finally, the plunger base 1 is placed on the pre-alloyed matrix powder, and the concave-convex tooth surface 11 of the plunger base 1 is aligned with the pre-alloyed matrix powder. High-temperature firing is then performed.

[0049] After sintering and forming, the plunger base body 1 is taken out and then ground and polished, that is, a plunger wear-resistant band 2 is formed at the end of the plunger base body 1.

[0050] The high-strength wear-resistant plunger provided in this embodiment can achieve close arrangement of thermally stable diamond polycrystals on the outer arc surface of the plunger, with a distance of ≤0.5mm; and ensure that the wear-resistant point coverage rate of the outer arc surface of the plunger is ≥90%.

[0051] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. Reference can be made to the common and similar parts between the various embodiments. For the devices disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the description is relatively simple, and the relevant parts can be referred to the method description.

[0052] The above description of the disclosed embodiments will enable one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not limited to the embodiments shown herein but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A high-strength wear-resistant plunger, comprising: A plunger base (1), one end of the plunger base (1) is used to connect with a hydraulic component, and the other end has a plunger wear-resistant belt (2); characterized in that the plunger wear-resistant belt (2) includes: an adhesive layer (21) and a wear-resistant body (22); One surface of the bonding layer (21) is bonded and fixed to an end surface of the plunger base (1) away from the hydraulic component; The number of the wear-resistant bodies (22) is multiple, and the wear-resistant bodies (22) are of a conical structure. The narrow head end (221) of the wear-resistant body (22) is embedded and bonded to a surface of the bonding layer (21) away from the plunger base (1), and the wide head end (222) of the wear-resistant body (22) is exposed outside the surface of the bonding layer (21) away from the plunger base (1) and is flush with the surface. The wide head ends (222) of the multiple wear-resistant bodies (22) are compactly arranged so that the end faces of the wide head ends (222) of the multiple wear-resistant bodies (22) are combined to form a wear-resistant surface.

2. A high-strength wear-resistant plunger according to claim 1, characterized in that: The cone side wall surface of the wear-resistant body (22) has friction lines (223).

3. A high-strength wear-resistant plunger according to claim 2, characterized in that: The friction pattern (223) is a spiral pattern.

4. A high-strength wear-resistant plunger according to claim 1, characterized in that: The wear-resistant surface forms a curved surface.

5. The high-strength wear-resistant plunger according to claim 1, characterized in that: The wear-resistant body (22) is heat-stable diamond polycrystal, and the bonding layer (21) is a metal layer formed by sintering pre-alloyed matrix powder.

6. A high-strength wear-resistant plunger according to claim 5, characterized in that: The heat-stable diamond polycrystal is sintered and bonded with the pre-alloyed matrix powder into an integrated structure through powder metallurgy technology.

7. The high-strength wear-resistant plunger according to claim 1, characterized in that: The wear-resistant body (22) is a cone structure.

8. The high-strength wear-resistant plunger according to claim 1, characterized in that: The end surface of the plunger base (1) for connecting with the bonding layer (21) has a concave-convex tooth surface (11).

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