Nanometer rare earth heat-dissipating drill pipe

Abstract

The utility model discloses a kind of nano rare earth heat breaking drill pipes, by spraying transition layer and heat breaking layer on the inner side wall of drill pipe body stem part, transition layer is formed by spraying tungsten carbide material, heat breaking layer is formed by spraying nano rare earth, the combination of both makes drill pipe have heat breaking performance, while, have wear resistance, corrosion resistance and fatigue resistance, tungsten carbide and nano rare earth complement each other and synergistically enhance, not only specifically solve the problem that the internal heat of drill pipe is too high and leads to drilling fluid denaturation, while drill pipe inner wall abrasion can be avoided, by the surface functionalization of nano rare earth, tribological property and corrosion protection ability can be improved, and the heat breaking reliability of overall coating and the service life of drill pipe are improved, so that drilling efficiency can be significantly improved and operation comprehensive cost is reduced.

Description

Technical Field

[0001] This utility model belongs to the field of oil and gas field drilling technology, specifically relating to a nano-rare earth heat-insulating drill pipe. Background Technology

[0002] During oil and gas field drilling, drilling fluid is circulated through the drill pipe to cool the drill bit. As a circulating medium, the drilling fluid carries away heat generated by friction between the drill pipe and the formation. In ultra-deep wells, bottom hole temperatures can reach over 205°C, and this high-temperature environment can easily reduce the yield strength of the drill pipe material by 40%. The drilling fluid flow rate, density, and initial temperature directly affect the wellbore temperature distribution. However, at high temperatures, the rheological properties of the drilling fluid can easily become uncontrollable. When the drilling fluid reaches 240°C, it can gel, leading to cuttings deposition and stuck drill bit. Therefore, a heat-insulating layer needs to be added to the drill pipe to block heat and allow the drilling fluid to flow normally.

[0003] In the prior art, such as application number CN202321970142.1, a heat-insulating drill pipe coating for a horizontal section of a horizontal well is disclosed. The coating consists of a combination of ZS-111 waterproof, anti-corrosion, heat-insulating, and thermally insulating coating and nano-alumina coating. The nano-alumina coating is sprayed on the surface of the ZS-111 waterproof, anti-corrosion, heat-insulating, and thermally insulating coating as an acid-, alkali-, and oil-resistant protective layer. With the increase of service time, the temperature of the drill pipe wall increases, and the roughness of the inner wall of the drill pipe is not up to standard, which will affect the adhesion performance of the ZS-111 waterproof, anti-corrosion, heat-insulating, and thermally insulating coating. The ZS-111 waterproof, anti-corrosion, heat-insulating, and thermally insulating coating may peel off in patches, causing the acid-, alkali-, and oil-resistant protective layer to peel off as well, resulting in heat insulation failure. In addition, the ZS-111 waterproof, anti-corrosion, heat-insulating, and thermally insulating coating has weak resistance and will cause interface peeling when subjected to high temperature impact above 600℃. Utility Model Content

[0004] The purpose of this invention is to provide a nano-rare earth thermal insulation drill pipe. A transition layer and a thermal insulation layer are sprayed onto the inner wall of the drill pipe body. The transition layer is formed by spraying tungsten carbide, and the thermal insulation layer is formed by spraying nano-rare earth. The combination of these two materials gives the drill pipe thermal insulation properties while also providing wear resistance, corrosion resistance, and fatigue resistance. The tungsten carbide and nano-rare earth complement each other and synergistically enhance each other. This not only specifically solves the problem of drilling fluid degradation caused by excessive internal heat in the drill pipe, but also prevents wear on the inner wall of the drill pipe. The surface functionalization of the nano-rare earth improves tribological properties and corrosion protection capabilities, and enhances the overall thermal insulation reliability of the coating and the service life of the drill pipe, thereby significantly improving drilling efficiency and reducing overall operating costs.

[0005] This utility model is achieved through the following technical solution: A nano-rare earth heat-insulating drill rod includes a drill rod body, which includes a rod section, a male interface, and a female interface. A through hole is provided in the rod section, which communicates with the male interface and the female interface respectively. A heat-insulating layer and a transition layer are provided on the side wall of the rod section. The transition layer is located between the heat-insulating layer and the inner side wall of the rod section, and the thickness of the transition layer is 0.3-0.6 mm.

[0006] Preferably, the heat insulation layer is formed by nano-rare earth spraying.

[0007] Preferably, the thickness of the heat insulation layer is 1.4-2.8 mm.

[0008] Preferably, the transition layer is formed by tungsten carbide spraying.

[0009] Preferably, the inner wall of the rod is machined with anchor patterns.

[0010] Preferably, the depth of the anchor pattern on the inner wall of the rod is 0.1-0.2 mm.

[0011] Preferably, the rod, male interface, and female interface are integrally formed structures.

[0012] Preferably, the drill pipe body is made of low alloy steel, and the thickness of the rod part is 10-13.5mm.

[0013] Compared with the prior art, this utility model has the following advantages and beneficial effects: 1) In this utility model, a transition layer and a heat insulation layer are sprayed onto the inner wall of the drill pipe body. The transition layer is formed by spraying tungsten carbide material, and the heat insulation layer is formed by spraying nano-rare earth. The combination of the two gives the drill pipe heat insulation performance, as well as wear resistance, corrosion resistance and fatigue resistance. Tungsten carbide and nano-rare earth complement each other and enhance each other synergistically. This not only specifically solves the problem of drilling fluid deterioration caused by excessive heat inside the drill pipe, but also avoids wear on the inner wall of the drill pipe. Through the surface functionalization of nano-rare earth, tribological properties and corrosion protection capabilities can be improved, and the overall heat insulation reliability of the coating and the service life of the drill pipe can be improved, thereby significantly improving drilling efficiency and reducing overall operating costs.

[0014] 2) In this invention, the transition layer formed by tungsten carbide spraying has extremely high hardness and excellent wear resistance. As the bottom layer, it directly bears the main mechanical wear. The inner wall of the drill rod is also processed with anchor patterns, which provide adhesion for the transition layer, making the transition layer fit more tightly with the inner wall of the drill rod. The tungsten carbide layer provides a hard and dense transition layer, avoiding the direct spraying of nano-rare earth onto the relatively soft inner wall of the drill rod. This can significantly reduce the stress on the surface of the drill rod, effectively avoid plastic deformation and fatigue spalling caused by hard particles pressing into the drill rod body, and greatly extend the service life of the drill rod.

[0015] 3) In this utility model, the heat insulation layer of nano-rare earth spraying not only exhibits excellent heat insulation effect, but also significantly reduces friction and frictional heat, making the running resistance of the drill rod smaller and effectively reducing the torque and energy consumption of the drill rod rotation; the huge specific surface area and high surface energy of nano-rare earth materials make it easier to wet and tightly bond with the tungsten carbide underlayer, reducing interlayer defects, improving the bonding strength and integrity of the overall coating, and effectively preventing the overall coating from peeling off without delamination under complex alternating loads. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings in the embodiments will be briefly described below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the drill pipe body structure in this utility model.

[0018] Figure 2 for Figure 1 Schematic diagram of the structure at point A in the middle.

[0019] Wherein: 1-rod, 11-male interface, 12-female interface, 2-transition layer, 3-thermal insulation layer. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some embodiments of this utility model, but not all embodiments.

[0021] Example 1: A nano-rare earth heat-insulating drill rod, such as Figure 1 and Figure 2 As shown, the drill pipe includes a drill pipe body, which comprises a rod portion 1, a male connector 11, and a female connector 12. The drill pipe body is made of low-alloy steel, and the rod portion 1 has a thickness of 11.5 mm. A through hole is provided inside the rod portion 1, which communicates with both the male connector 11 and the female connector 12. The male connector 11 has an external thread, and the female connector 12 has an internal thread. Drill pipes are connected to each other via the male connector 11 and the female connector 12. A heat insulation layer 3 and a transition layer 2 are provided on the side wall of the rod portion 1. The transition layer 2 is located between the heat insulation layer 3 and the inner side wall of the rod portion 1, and has a thickness of 0.4 mm. The transition layer 2 is coated with tungsten carbide.

[0022] The transition layer 2 formed by tungsten carbide spraying has extremely high hardness and excellent wear resistance. As the bottom layer, it directly bears the main mechanical wear. The inner wall of the drill pipe is also processed with anchor patterns, and the depth of the anchor patterns on the inner wall of the rod part 1 is 0.15mm. The anchor patterns provide adhesion for the transition layer 2, making the transition layer 2 fit more tightly with the inner wall of the drill pipe. The tungsten carbide layer provides a hard and dense transition layer 2, avoiding the direct spraying of the heat insulation layer 3 on the relatively soft inner wall of the drill pipe. This can significantly reduce the stress on the inner surface of the drill pipe, effectively avoid plastic deformation and fatigue spalling caused by hard particles pressing into the drill pipe body, and greatly extend the service life of the drill pipe.

[0023] Example 2: like Figure 2 As shown, the heat insulation layer 3 is formed by nano-rare earth spraying, and the thickness of the heat insulation layer 3 is 2.2mm. The nano-rare earth sprayed heat insulation layer 3 not only exhibits excellent heat insulation effect, but also significantly reduces friction and frictional heat, making the running resistance of the drill pipe smaller. The huge specific surface area and high surface energy of the nano-rare earth material make it easier to wet and tightly bond with tungsten carbide, reduce interlayer defects, improve the bonding strength and integrity of the overall coating, and effectively prevent the overall coating from delamination and peeling under complex alternating loads.

[0024] By spraying a transition layer 2 and a heat-insulating layer 3 onto the inner wall of the drill pipe body 1, the combination of these two layers provides the drill pipe with heat insulation properties while also exhibiting wear resistance, corrosion resistance, and fatigue resistance. Tungsten carbide and nano-rare earth elements complement and synergistically enhance each other, not only specifically addressing the problem of drilling fluid degradation caused by excessive internal heat in the drill pipe, but also preventing wear on the inner wall of the drill pipe. The surface functionalization of the nano-rare earth elements improves tribological properties and corrosion protection capabilities, and enhances the overall heat insulation reliability of the coating and the service life of the drill pipe, thereby significantly improving drilling efficiency and reducing overall operating costs. The other parts of this embodiment are the same as those in the above embodiments and will not be repeated here.

[0025] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0026] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Any simple modifications or equivalent changes made to the above embodiments based on the technical essence of the present utility model shall fall within the protection scope of the present utility model.

Claims

1. A nano-rare earth heat-insulating drill rod, characterized in that, The drill pipe includes a drill pipe body, which comprises a rod section, a male connector, and a female connector. A through hole is provided within the rod section, communicating with both the male and female connectors. A heat insulation layer and a transition layer are provided on the sidewall of the rod section. The transition layer is located between the heat insulation layer and the inner sidewall of the rod section, and its thickness is 0.3-0.6 mm. The heat insulation layer is formed by nano-rare earth spraying, and the transition layer is formed by tungsten carbide spraying.

2. The nano-rare earth heat-insulating drill rod as described in claim 1, characterized in that, The thickness of the heat insulation layer is 1.4-2.8 mm.

3. The nano-rare earth heat-insulating drill rod as described in claim 1, characterized in that, The inner wall of the rod is machined with anchor patterns.

4. The nano-rare earth heat-insulating drill rod as described in claim 3, characterized in that, The depth of the anchor pattern on the inner wall of the rod is 0.1-0.2 mm.

5. The nano-rare earth heat-insulating drill rod as described in claim 1, characterized in that, The rod, male interface, and female interface are integrally molded structures.

6. The nano-rare earth heat-insulating drill rod as described in claim 1, characterized in that, The drill pipe body is made of low alloy steel, and the thickness of the rod part is 10-13.5mm.

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