A wear-resistant belt for anti-wear and friction-reducing oil drill pipe joint, its preparation method and application

Abstract

This invention discloses a wear-resistant strip for oil drill pipe joints, its preparation method, and its application, belonging to the field of oil drill pipe joint protection technology. The wear-resistant strip for oil drill pipe joints disclosed in this invention features optimized composition design, using medium carbon (C), alloyed with Mn, Cr, Ni, Mo, and B, and micro-alloyed with V. The outer diameter of the drill pipe joint is appropriately increased, and a quenching and tempering heat treatment is performed. The surface wear-resistant strip is prepared using an induction heating quenching + induction tempering surface strengthening heat treatment process, giving the drill pipe joint good strength and toughness while possessing high surface hardness and wear-resistant and friction-reducing properties. It can be repeatedly processed and reused 2-3 times, avoiding the shortcomings of traditional wear-resistant strips, simplifying the process, and saving costs.

Description

Technical Field

[0001] This invention belongs to the field of oil drill pipe joint protection technology, specifically relating to a wear-resistant belt for anti-wear and friction-reducing oil drill pipe joints, its preparation method, and its application. Background Technology

[0002] Drill pipe is a crucial tool in rotary drilling for oil and gas development, and wear on the drill pipe joint is one of the main causes of reduced drill pipe life and premature failure. During drilling, the outer surface of the drill pipe joint either contacts the formation (open hole section), causing wear on the outer diameter and reducing its strength and service life; or it contacts the outer casing (casing section), causing casing wear, leading to reduced strength and service life, and in severe cases, even resulting in the abandonment of the entire well and significant economic losses. Therefore, the wear-resistant portion of the drill pipe joint's outer diameter must resist formation wear while minimizing wear on the casing. To improve the wear resistance of the drill pipe joint, a common practice is to weld a wear-resistant strip onto the outer diameter portion of the joint. Wear-resistant strip materials have evolved from the earliest WC cemented carbide to amorphous Cr alloys, Cr-Mn-Mo iron-based alloys, Ni-B-Nb iron-based alloys, diamond composite alloys, and other materials, significantly improving their wear resistance, friction reduction, and processing performance. However, in general: these wear-resistant tapes have uneven surfaces, causing significant damage to the casing during use; the wear-resistant tape material differs greatly from the base material, resulting in poor bonding strength; micro-cracks often exist on the surface, making them prone to detachment during use; and the welding process is complex, making it difficult to control the welding quality. Summary of the Invention

[0003] The purpose of this invention is to provide a wear-resistant strip for oil drill pipe joints that reduces friction and wear, as well as its preparation method and application, in order to solve the technical problems of existing wear-resistant strips, such as significant damage to the casing during use, poor bonding strength with the base material, easy detachment, and difficulty in quality control of the welding process.

[0004] To achieve the above objectives, the present invention employs the following technical solution:

[0005] This invention discloses a wear-resistant strip for an anti-wear and friction-reducing oil drill pipe joint. The wear-resistant strip, by mass percentage, comprises: 0.43%–0.48% C, 1.95%–2.70% Cr+Mn+Mo, 0.05%–0.1% V, 0.0015%–0.0030% B, 0.17%–0.39% Si, ≤0.015% P, ≤0.005% S, and the balance being unavoidable impurities.

[0006] The present invention also discloses a wear-resistant strip for an anti-wear and friction-reducing oil drill pipe joint. The wear-resistant strip, by mass percentage, comprises: 0.43%–0.48% C, 2.25%–3.50% Cr+Ni+Mn+Mo, 0.05%–0.1% V, 0.0015%–0.0030% B, 0.17%–0.39% Si, ≤0.015% P, ≤0.005% S, and the balance being unavoidable impurities.

[0007] This invention also discloses a method for preparing the above two types of wear-resistant and friction-reducing oil drill pipe joint wear-resistant belts, comprising the following steps:

[0008] S1: The alloy composition of the oil drill pipe joint is designed, and the forming process is carried out according to the composition design to obtain the pre-treated oil drill pipe joint, wherein the composition of the pre-treated oil drill pipe joint is the wear-resistant belt composition of the two anti-wear and friction-reducing oil drill pipe joints mentioned above.

[0009] S2: The pretreated oil drill pipe joint is subjected to surface strengthening heat treatment to obtain a wear-resistant and friction-reducing oil drill pipe joint wear-resistant band on the surface of the oil drill pipe joint.

[0010] Furthermore, in S1, the forming process includes: steelmaking, continuous casting, hot rolling in the austenitic region, die forging, and quenching and tempering heat treatment; the microstructure of the pretreated oil drill pipe joint is tempered sorbite.

[0011] Furthermore, in S1, the outer diameter of the pretreated oil drill pipe joint is 91.7 mm to 227.9 mm.

[0012] Further, in S2, the process parameters for the surface strengthening heat treatment are as follows: First, induction heating quenching is employed, wherein the frequency of the induction heating equipment is 5kHz~10kHz, the heating temperature is 870℃~920℃, the heating time is 4s~7s, and the moving speed of the pretreated oil drill pipe joint relative to the induction heating coil is 4.3mm / s~7.5mm / s. After induction heating, it is immediately cooled by water spray. Immediately after induction heating quenching, induction heating tempering is performed, with a specific power of 2kW / cm². 2 The frequency is 3kHz, the heating temperature is 180℃~200℃, the heating time is 10s, and the moving speed of the pretreated oil drill pipe joint relative to the induction heating coil is 3mm / s.

[0013] Furthermore, in S2, after the pretreated oil drill pipe joint undergoes surface strengthening heat treatment, a heated quenching band is formed on the surface of the oil drill pipe joint; the length of the heated quenching band is 51mm to 102mm.

[0014] Furthermore, in S2, the surface hardness of the wear-resistant strip of the anti-wear and friction-reducing oil drill pipe joint is not less than 55HRC, and the depth of the hardened layer is not less than 3mm.

[0015] The present invention also discloses the application of the above-mentioned wear-resistant belt for anti-wear and friction-reducing oil drill pipe joints. When the wear-resistant belt for anti-wear and friction-reducing oil drill pipe joints is worn after operation, the worn part is machined and the surface of the wear-resistant belt for anti-wear and friction-reducing oil drill pipe joints is repeatedly subjected to surface strengthening heat treatment for reuse.

[0016] Furthermore, when the wear-resistant strip of the anti-wear and friction-reducing oil drill pipe joint wears down to a reduction of 2.5mm to 3mm in outer diameter after operation, the worn part is machined and the surface strengthening heat treatment is repeated on the surface of the wear-resistant strip of the anti-wear and friction-reducing oil drill pipe joint.

[0017] The surface strengthening heat treatment is repeated 2 to 3 times.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] This invention discloses a wear-resistant strip for an anti-wear and friction-reducing oil drill pipe joint. Its composition is designed with medium carbon (C), alloyed with Mn, Cr, Ni, Mo, and B, and micro-alloyed with V. The C content of 0.43%–0.48% ensures hardenability and surface hardness, and the carbon content is increased compared to ordinary drill pipe joints. The 0.43%–0.48% C content, combined with the reinforcement of a 1.95%–2.70% Cr-Mn-Mo system, improves the hardenability of the steel, thereby increasing its strength and toughness, and also improves the tempering stability of the steel. Qualitatively, Cr and Mo carbides can improve surface hardness and wear resistance; in addition, the 0.43% to 0.48% C content combined with the 2.25% to 3.50% Cr-Ni-Mn-Mo system reinforcement improves the hardenability of the steel, thereby increasing its strength and toughness, and can also improve the tempering stability of the steel. Cr and Mo carbides can improve the hardness and wear resistance of the surface hardened layer; the selection of reinforcing phases, combined with the addition of V and B, results in an overall improvement in strength and toughness, and also increases the surface hardness of the hardened layer.

[0020] This invention also discloses a method for preparing the aforementioned wear-resistant and friction-reducing oil drill pipe joint wear-resistant band. The method involves directly performing surface strengthening heat treatment on the surface of the oil drill pipe joint after composition design, to form a wear-resistant band with good bonding to the substrate on the surface of the oil drill pipe joint. The surface hardness of the wear-resistant band is not less than 55 HRC, the hardened layer depth is not less than 3 mm, the surface is free of defects, the hardened layer has good bonding with the substrate, and the entire structure is integrated. This solves the technical problem of significant differences between the wear-resistant band material and the substrate material, resulting in poor bonding strength. Furthermore, it simplifies the preparation process, significantly reduces the production and use costs of the drill pipe joint, and can meet the requirements of oil and gas wells under complex operating conditions to both prevent drill pipe joint wear and protect the casing.

[0021] This invention also discloses the application of the aforementioned wear-resistant and friction-reducing wear-resistant strip in oil drill pipe joints. During use, the worn-out wear-resistant strip can be repeatedly processed 2-3 times, exhibiting excellent wear resistance and friction reduction performance, and significantly extending its service life. This drill pipe joint reduces formation wear on the drill pipe and significantly reduces wear of the outer surface wear-resistant strip on the casing. Furthermore, it is reusable, has a simple manufacturing process, and significantly improves the service life of both the drill pipe joint and the drill pipe. This composition design and wear-resistant strip preparation process are not only applicable to drill pipe joints but also to drill collars and other downhole tools. Detailed Implementation

[0022] To enable those skilled in the art to understand the features and effects of the present invention, the terms and expressions used in the specification and claims are explained and defined in general below. Unless otherwise specified, all technical and scientific terms used herein have the ordinary meaning understood by those skilled in the art regarding the present invention, and in case of conflict, the definitions in this specification shall prevail.

[0023] The theories or mechanisms described and disclosed herein, whether right or wrong, should not in any way limit the scope of the invention, that is, the contents of the invention can be implemented without being limited by any particular theory or mechanism.

[0024] In this document, all features defined by numerical ranges or percentage ranges, such as numerical values, quantities, contents, and concentrations, are for the sake of brevity and convenience only. Accordingly, descriptions of numerical ranges or percentage ranges should be considered as covering and specifically disclosing all possible sub-ranges and individual numerical values ​​(including integers and fractions) within those ranges.

[0025] In this article, unless otherwise specified, “contains,” “includes,” “containing,” “has,” or similar terms cover the meanings of “composed of” and “mainly composed of,” for example, “A contains a” covers the meanings of “A contains a and others” and “A contains only a.”

[0026] For the sake of brevity, not all possible combinations of the technical features in each implementation scheme or embodiment are described herein. Therefore, as long as there is no contradiction in the combination of these technical features, the technical features in each implementation scheme or embodiment can be combined arbitrarily, and all possible combinations should be considered within the scope of this specification.

[0027] This invention provides a wear-resistant strip for drill pipe joints with a surface hardness of not less than 55 HRC, a hardened layer depth of not less than 3 mm, no surface defects, good bonding between the hardened layer and the substrate, wear resistance and friction reduction, and the ability to be repeatedly processed and reused after wear, as well as a method for preparing the same. When designing the composition, the wear-resistant strip for oil drill pipe joints comprises, by mass percentage: 0.43%–0.48% C, 1.95%–2.70% Cr+Mn+Mo, 0.05%–0.1% V, 0.0015%–0.0030% B, 0.17%–0.39% Si, ≤0.015% P, ≤0.005% S, and the balance being unavoidable impurities.

[0028] Alternatively, by mass percentage, the wear-resistant strip of the anti-wear and friction-reducing oil drill pipe joint comprises: 0.43%–0.48% C, 2.25%–3.50% Cr+Ni+Mn+Mo, 0.05%–0.1% V, 0.0015%–0.0030% B, 0.17%–0.39% Si, ≤0.015% P, ≤0.005% S, and the balance being unavoidable impurities.

[0029] In designing the above composition, to ensure the comprehensive mechanical properties, surface hardness, and hardened layer depth of the drill pipe joint and its wear-resistant zone, a medium carbon alloy is used, with added Mn, Cr, Ni, Mo, and B, and V micro-alloying. The roles and content ranges of each major element are explained below:

[0030] Carbon (C) is a strengthening element in steel, but too low a carbon content is detrimental to improving the hardenability and toughness of the steel, and is also unfavorable for improving the strength and surface hardness of the steel; too high a carbon content is detrimental to the toughness of the steel. To ensure hardenability and surface hardness, the carbon content is increased compared to ordinary drill pipe joints, and should be controlled within the range of 0.43% to 0.48%.

[0031] Cr-Mn-Mo series: mainly used to improve the hardenability of steel, thereby increasing its strength and toughness, and can also improve the tempering stability of steel. Carbides containing Cr and Mo can improve surface hardness and wear resistance. The Cr+Mn+Mo content should be controlled within the range of 1.95% to 2.70%.

[0032] Cr-Ni-Mn-Mo system: mainly used to improve the hardenability of steel, thereby increasing its strength and toughness, and can also improve the tempering stability of steel. Cr and Mo carbides can improve the hardness and wear resistance of the surface hardened layer. The Cr+Ni+Mn+Mo content should be controlled within the range of 2.25% to 3.50%.

[0033] V: When added to steel, it forms VC and VN with C and N in the steel. It has the effect of inhibiting the growth of austenite grains and refining the grains, thereby improving strength and toughness, and can also increase the surface hardness of the hardened layer. It should be controlled within the range of 0.05% to 0.10%.

[0034] B: Adding it to steel can significantly improve the hardenability of the steel, thereby increasing its strength. It can also increase the surface hardness of the hardened layer, but excessive content can cause boron embrittlement. It should be controlled within the range of 0.0015% to 0.0030%.

[0035] Si: A common element in steel, its content is planned to be controlled within the range of 0.17% to 0.39%.

[0036] P: Harmful impurity element, to be controlled at ≤0.015%.

[0037] S: Harmful impurity elements, to be controlled at ≤0.005%.

[0038] During preparation, processes such as steelmaking (including ladle refining, Ca treatment, and vacuum degassing), continuous casting, hot rolling in the austenitic region, die forging, and quenching and tempering heat treatment are used to obtain a fine and uniform tempered sorbite microstructure in the material, thereby achieving a reasonable match between the strength and toughness of the drill pipe joint and obtaining a pretreated oil drill pipe joint.

[0039] The pretreated oil drill pipe joint surface was then subjected to surface strengthening heat treatment, including induction hardening, with a specific power of 0.6–1.0 kW / cm². 2 The induction heating equipment operates at a frequency of 5kHz to 10kHz, a heating temperature of 870℃ to 920℃, and a heating time of 4s to 7s. The moving speed of the drill pipe joint relative to the induction heating coil is 4.3mm / s to 7.5mm / s. Water cooling is performed immediately after induction heating. The length of the heating and quenching zone is 51mm to 102mm, with specific dimensions conforming to relevant standards or user specifications. Induction tempering is performed immediately after induction quenching, with a specific power of 2kW / cm². 2 The frequency is 3kHz, the heating temperature is 180℃~200℃, the heating time is 10s, and the moving speed of the drill pipe joint relative to the induction heating coil is 3mm / s.

[0040] The outer diameter of the drill pipe joint is increased by 6mm to 12mm compared to that of the ordinary drill pipe joint (that is, an increase of 6mm to 12mm based on the standard outer diameter of 85.7mm to 215.9mm). When the outer diameter is worn down to a reduction of 2.5mm to 3mm, the outer surface is machined and the surface is quenched again. In this way, the drill pipe joint can be subjected to surface quenching heat treatment 2 to 3 times and can be reused 2 to 3 times, which significantly improves the service life of the drill pipe joint and the drill pipe.

[0041] The present invention will be further illustrated below with reference to specific embodiments. It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of the invention. Furthermore, it should be understood that after reading the teachings of this invention, those skilled in the art can make various alterations or modifications to the invention, and these equivalent forms also fall within the scope defined by the appended claims.

[0042] The following examples use instruments and equipment conventional in the art. Experimental methods in the following examples, unless otherwise specified, are generally performed under conventional conditions or as recommended by the manufacturer. All raw materials used in the following examples are conventional commercially available products with specifications conventional in the art. In this specification and the following examples, unless otherwise specified, "%" refers to weight percentage, "parts" refers to parts by weight, and "ratio" refers to weight proportion.

[0043] Example 1

[0044] A method for preparing a wear-resistant strip for an anti-wear and friction-reducing oil drill pipe joint includes the following steps:

[0045] S1: The alloy composition of the oil drill pipe joint is designed, and the forming process is carried out according to the composition design to obtain the pre-treated oil drill pipe joint. The composition of the pre-treated oil drill pipe joint, in mass percentage, includes: 0.43% C, 2.70% Cr+Mn+Mo, 0.1% V and 0.0027% B.

[0046] S2: The pretreated oil drill pipe joint is first subjected to induction heating quenching. The induction heating equipment has a frequency of 5kHz, a heating temperature of 870~890℃, a heating time of 4s, and a specific power of 1.00kW / cm². 2 The pre-treated oil drill pipe joint moves at a speed of 7.5 mm / s relative to the induction heating coil. It is immediately cooled by water spray after induction heating. Induction heating tempering is performed immediately after induction quenching, with a specific power of 2 kW / cm². 2 The frequency is 3kHz, the heating temperature is 180℃~200℃, the heating time is 10s, and the moving speed of the pretreated oil drill pipe joint relative to the induction heating coil is 3mm / s. After completion, a wear-resistant and friction-reducing oil drill pipe joint wear-resistant belt is obtained on the surface of the oil drill pipe joint. The surface hardness of the wear-resistant belt is 55HRC and the hardened layer depth is 3.30mm.

[0047] Example 2

[0048] A method for preparing a wear-resistant strip for an anti-wear and friction-reducing oil drill pipe joint includes the following steps:

[0049] S1: The alloy composition of the oil drill pipe joint is designed, and the forming process is carried out according to the composition design to obtain the pre-treated oil drill pipe joint. The composition of the pre-treated oil drill pipe joint, in mass percentage, includes: 0.45% C, 2.41% Cr+Mn+Mo, 0.07% V and 0.0018% B.

[0050] S2: The pretreated oil drill pipe joint is first subjected to induction heating quenching. The induction heating equipment has a frequency of 5kHz, a heating temperature of 870~890℃, a heating time of 4s, and a specific power of 1.00kW / cm². 2 The pre-treated oil drill pipe joint moves at a speed of 7.5 mm / s relative to the induction heating coil. It is immediately cooled by water spray after induction heating. Induction heating tempering is performed immediately after induction quenching, with a specific power of 2 kW / cm². 2 The frequency is 3kHz, the heating temperature is 180℃~200℃, the heating time is 10s, and the moving speed of the pretreated oil drill pipe joint relative to the induction heating coil is 3mm / s. After completion, an anti-wear and friction-reducing wear-resistant strip is obtained on the surface of the oil drill pipe joint. The surface hardness of the wear-resistant strip is 57HRC, and the hardened layer depth is 3.12mm.

[0051] Example 3

[0052] A method for preparing a wear-resistant strip for an anti-wear and friction-reducing oil drill pipe joint includes the following steps:

[0053] S1: The alloy composition of the oil drill pipe joint is designed, and the forming process is carried out according to the composition design to obtain the pre-treated oil drill pipe joint. The composition of the pre-treated oil drill pipe joint, in mass percentage, includes: 0.48% C, 1.95% Cr+Mn+Mo, 0.05% V and 0.0022% B.

[0054] S2: The pretreated oil drill pipe joint is first subjected to induction heating quenching. The induction heating equipment has a frequency of 5kHz, a heating temperature of 870~890℃, a heating time of 4s, and a specific power of 1.00kW / cm². 2 The pre-treated oil drill pipe joint moves at a speed of 7.5 mm / s relative to the induction heating coil. It is immediately cooled by water spray after induction heating. Induction heating tempering is performed immediately after induction quenching, with a specific power of 2 kW / cm². 2The frequency is 3kHz, the heating temperature is 180℃~200℃, the heating time is 10s, and the moving speed of the pretreated oil drill pipe joint relative to the induction heating coil is 3mm / s. After completion, a wear-resistant and friction-reducing oil drill pipe joint wear-resistant belt is obtained on the surface of the oil drill pipe joint. The surface hardness of the wear-resistant belt is 60HRC and the hardened layer depth is 3.01mm.

[0055] Example 4

[0056] A method for preparing a wear-resistant strip for an anti-wear and friction-reducing oil drill pipe joint includes the following steps:

[0057] S1: The alloy composition of the oil drill pipe joint is designed, and the forming process is carried out according to the composition design to obtain the pre-treated oil drill pipe joint. The composition of the pre-treated oil drill pipe joint, in mass percentage, includes: 0.47% C, 2.11% Cr+Mn+Mo, 0.06% V and 0.0015% B.

[0058] S2: The pretreated oil drill pipe joint is first subjected to induction heating quenching. The induction heating equipment has a frequency of 5kHz, a heating temperature of 880-900℃, a heating time of 5s, and a specific power of 0.85kW / cm². 2 The pre-treated oil drill pipe joint moves at a speed of 6.0 mm / s relative to the induction heating coil. It is immediately cooled by water spray after induction heating. Induction heating tempering is performed immediately after induction quenching, with a specific power of 2 kW / cm². 2 The frequency is 3kHz, the heating temperature is 180℃~200℃, the heating time is 10s, and the moving speed of the pretreated oil drill pipe joint relative to the induction heating coil is 3mm / s. After completion, a wear-resistant and friction-reducing oil drill pipe joint wear-resistant belt is obtained on the surface of the oil drill pipe joint. The surface hardness of the wear-resistant belt is 59HRC and the hardened layer depth is 3.07mm.

[0059] Example 5

[0060] A method for preparing a wear-resistant strip for an anti-wear and friction-reducing oil drill pipe joint includes the following steps:

[0061] S1: The alloy composition of the oil drill pipe joint is designed, and the forming process is carried out according to the composition design to obtain the pre-treated oil drill pipe joint. The composition of the pre-treated oil drill pipe joint, by mass percentage, includes: 0.44% C, 2.54% Cr+Mn+Mo, 0.09% V and 0.003% B.

[0062] S2: The pretreated oil drill pipe joint is first subjected to induction heating quenching. The induction heating equipment has a frequency of 5kHz, a heating temperature of 880-900℃, a heating time of 5s, and a specific power of 0.85kW / cm². 2 The pre-treated oil drill pipe joint moves at a speed of 6.0 mm / s relative to the induction heating coil. It is immediately cooled by water spray after induction heating. Induction heating tempering is performed immediately after induction quenching, with a specific power of 2 kW / cm². 2 The frequency is 3kHz, the heating temperature is 180℃~200℃, the heating time is 10s, and the moving speed of the pretreated oil drill pipe joint relative to the induction heating coil is 3mm / s. After completion, a wear-resistant and friction-reducing oil drill pipe joint wear-resistant belt is obtained on the surface of the oil drill pipe joint. The surface hardness of the wear-resistant belt is 56HRC and the hardened layer depth is 3.19mm.

[0063] Example 6

[0064] A method for preparing a wear-resistant strip for an anti-wear and friction-reducing oil drill pipe joint includes the following steps:

[0065] S1: The alloy composition of the oil drill pipe joint is designed, and the forming process is carried out according to the composition design to obtain the pre-treated oil drill pipe joint. The composition of the pre-treated oil drill pipe joint, in mass percentage, includes: 0.46% C, 2.24% Cr+Mn+Mo, 0.08% V and 0.0024% B.

[0066] S2: The pretreated oil drill pipe joint is first subjected to induction heating quenching. The induction heating equipment has a frequency of 5kHz, a heating temperature of 880-900℃, a heating time of 5s, and a specific power of 0.85kW / cm². 2 The pre-treated oil drill pipe joint moves at a speed of 6.0 mm / s relative to the induction heating coil. It is immediately cooled by water spray after induction heating. Induction heating tempering is performed immediately after induction quenching, with a specific power of 2 kW / cm². 2 The frequency is 3kHz, the heating temperature is 180℃~200℃, the heating time is 10s, and the moving speed of the pretreated oil drill pipe joint relative to the induction heating coil is 3mm / s. After completion, a wear-resistant and friction-reducing oil drill pipe joint wear-resistant belt is obtained on the surface of the oil drill pipe joint. The surface hardness of the wear-resistant belt is 58HRC and the hardened layer depth is 3.31mm.

[0067] Example 7

[0068] A method for preparing a wear-resistant strip for an anti-wear and friction-reducing oil drill pipe joint includes the following steps:

[0069] S1: The alloy composition of the oil drill pipe joint is designed, and the forming process is carried out according to the composition design to obtain the pre-treated oil drill pipe joint. The composition of the pre-treated oil drill pipe joint, by mass percentage, includes: 0.45% C, 2.99% Cr+Ni+Mn+Mo, 0.08% V and 0.0025% B.

[0070] S2: The pretreated oil drill pipe joint is first subjected to induction heating quenching. The induction heating equipment has a frequency of 10kHz, a heating temperature of 890~910℃, a heating time of 6s, and a specific power of 0.7kW / cm². 2 The pre-treated oil drill pipe joint moves at a speed of 5.0 mm / s relative to the induction heating coil and is immediately cooled by water spray after induction heating. Induction heating tempering is performed immediately after induction quenching, with a specific power of 2 kW / cm². 2 The frequency is 3kHz, the heating temperature is 180℃~200℃, the heating time is 10s, and the moving speed of the pretreated oil drill pipe joint relative to the induction heating coil is 3mm / s. After completion, a wear-resistant and friction-reducing oil drill pipe joint wear-resistant belt is obtained on the surface of the oil drill pipe joint. The surface hardness of the wear-resistant belt is 58HRC and the hardened layer depth is 3.37mm.

[0071] Example 8

[0072] A method for preparing a wear-resistant strip for an anti-wear and friction-reducing oil drill pipe joint includes the following steps:

[0073] S1: The alloy composition of the oil drill pipe joint is designed, and the forming process is carried out according to the composition design to obtain the pre-treated oil drill pipe joint. The composition of the pre-treated oil drill pipe joint, in mass percentage, includes: 0.43% C, 3.5% Cr+Ni+Mn+Mo, 0.09% V and 0.0026% B.

[0074] S2: The pretreated oil drill pipe joint is first subjected to induction heating quenching. The induction heating equipment has a frequency of 10kHz, a heating temperature of 890~910℃, a heating time of 6s, and a specific power of 0.7kW / cm². 2 The pre-treated oil drill pipe joint moves at a speed of 5.0 mm / s relative to the induction heating coil and is immediately cooled by water spray after induction heating. Induction heating tempering is performed immediately after induction quenching, with a specific power of 2 kW / cm². 2The frequency is 3kHz, the heating temperature is 180℃~200℃, the heating time is 10s, and the moving speed of the pretreated oil drill pipe joint relative to the induction heating coil is 3mm / s. After completion, a wear-resistant and friction-reducing oil drill pipe joint wear-resistant belt is obtained on the surface of the oil drill pipe joint. The surface hardness of the wear-resistant belt is 56HRC and the hardened layer depth is 3.49mm.

[0075] Example 9

[0076] A method for preparing a wear-resistant strip for an anti-wear and friction-reducing oil drill pipe joint includes the following steps:

[0077] S1: The alloy composition of the oil drill pipe joint is designed, and the forming process is carried out according to the composition design to obtain the pre-treated oil drill pipe joint. The composition of the pre-treated oil drill pipe joint, in mass percentage, includes: 0.47% C, 2.51% Cr+Ni+Mn+Mo, 0.05% V and 0.0021% B.

[0078] S2: The pretreated oil drill pipe joint is first subjected to induction heating quenching. The induction heating equipment has a frequency of 10kHz, a heating temperature of 890~910℃, a heating time of 6s, and a specific power of 0.7kW / cm². 2 The pre-treated oil drill pipe joint moves at a speed of 5.0 mm / s relative to the induction heating coil and is immediately cooled by water spray after induction heating. Induction heating tempering is performed immediately after induction quenching, with a specific power of 2 kW / cm². 2 The frequency is 3kHz, the heating temperature is 180℃~200℃, the heating time is 10s, and the moving speed of the pretreated oil drill pipe joint relative to the induction heating coil is 3mm / s. After completion, a wear-resistant and friction-reducing oil drill pipe joint wear-resistant belt is obtained on the surface of the oil drill pipe joint. The surface hardness of the wear-resistant belt is 60HRC and the hardened layer depth is 3.26mm.

[0079] Example 10

[0080] A method for preparing a wear-resistant strip for an anti-wear and friction-reducing oil drill pipe joint includes the following steps:

[0081] S1: The alloy composition of the oil drill pipe joint is designed, and the forming process is carried out according to the composition design to obtain the pre-treated oil drill pipe joint. The composition of the pre-treated oil drill pipe joint, in mass percentage, includes: 0.48% C, 2.25% Cr+Ni+Mn+Mo, 0.06% V and 0.0019% B.

[0082] S2: The pretreated oil drill pipe joint is first subjected to induction heating quenching. The induction heating equipment has a frequency of 10kHz, a heating temperature of 900-920℃, a heating time of 7s, and a specific power of 0.6kW / cm². 2 The pre-treated oil drill pipe joint moves at a speed of 4.3 mm / s relative to the induction heating coil. It is immediately cooled by water spray after induction heating. Induction heating tempering is performed immediately after induction quenching, with a specific power of 2 kW / cm². 2 The frequency is 3kHz, the heating temperature is 180℃~200℃, the heating time is 10s, and the moving speed of the pretreated oil drill pipe joint relative to the induction heating coil is 3mm / s. After completion, a wear-resistant and friction-reducing oil drill pipe joint wear-resistant belt is obtained on the surface of the oil drill pipe joint. The surface hardness of the wear-resistant belt is 60HRC and the hardened layer depth is 3.21mm.

[0083] Example 11

[0084] A method for preparing a wear-resistant strip for an anti-wear and friction-reducing oil drill pipe joint includes the following steps:

[0085] S1: The alloy composition of the oil drill pipe joint is designed, and the forming process is carried out according to the composition design to obtain the pre-treated oil drill pipe joint. The composition of the pre-treated oil drill pipe joint, in mass percentage, includes: 0.46% C, 2.74% Cr+Ni+Mn+Mo, 0.07% V and 0.0030% B.

[0086] S2: The pretreated oil drill pipe joint is first subjected to induction heating quenching. The induction heating equipment has a frequency of 10kHz, a heating temperature of 900-920℃, a heating time of 7s, and a specific power of 0.6kW / cm². 2 The pre-treated oil drill pipe joint moves at a speed of 4.3 mm / s relative to the induction heating coil. It is immediately cooled by water spray after induction heating. Induction heating tempering is performed immediately after induction quenching, with a specific power of 2 kW / cm². 2 The frequency is 3kHz, the heating temperature is 180℃~200℃, the heating time is 10s, and the moving speed of the pretreated oil drill pipe joint relative to the induction heating coil is 3mm / s. After completion, an anti-wear and friction-reducing wear-resistant strip is obtained on the surface of the oil drill pipe joint. The surface hardness of the wear-resistant strip is 59HRC, and the hardened layer depth is 3.32mm.

[0087] Example 12

[0088] A method for preparing a wear-resistant strip for an anti-wear and friction-reducing oil drill pipe joint includes the following steps:

[0089] S1: The alloy composition of the oil drill pipe joint is designed, and the forming process is carried out according to the composition design to obtain the pre-treated oil drill pipe joint. The composition of the pre-treated oil drill pipe joint, in mass percentage, includes: 0.44% C, 3.26% Cr+Ni+Mn+Mo, 0.10% V and 0.0015% B.

[0090] S2: The pretreated oil drill pipe joint is first subjected to induction heating quenching. The induction heating equipment has a frequency of 10kHz, a heating temperature of 900-920℃, a heating time of 7s, and a specific power of 0.6kW / cm². 2 The pre-treated oil drill pipe joint moves at a speed of 4.3 mm / s relative to the induction heating coil. It is immediately cooled by water spray after induction heating. Induction heating tempering is performed immediately after induction quenching, with a specific power of 2 kW / cm². 2 The frequency is 3kHz, the heating temperature is 180℃~200℃, the heating time is 10s, and the moving speed of the pretreated oil drill pipe joint relative to the induction heating coil is 3mm / s. After completion, a wear-resistant and friction-reducing oil drill pipe joint wear-resistant belt is obtained on the surface of the oil drill pipe joint. The surface hardness of the wear-resistant belt is 57HRC and the hardened layer depth is 3.42mm.

[0091] Table 1 shows the chemical composition of the wear-resistant strip of the oil drill pipe joint prepared in the above embodiments, and Table 2 shows the process parameters and performance of the surface strengthening heat treatment used in the preparation of the above embodiments.

[0092] Table 1. Main chemical components of wear-resistant and friction-reducing oil drill pipe joints in the examples.

[0093] Actual example C Cr+Mn+Mo (Cr-Mn-Mo system) Cr+Ni+Mn+Mo (Cr-Ni-Mn-Mo system) V B 1 0.43 2.70 - 0.10 0.0027 2 0.45 2.41 - 0.07 0.0018 3 0.48 1.95 - 0.05 0.0022 4 0.47 2.11 - 0.06 0.0015 5 0.44 2.54 - 0.09 0.0030 6 0.46 2.24 - 0.08 0.0024 7 0.45 - 2.99 0.08 0.0025 8 0.43 - 3.50 0.09 0.0026 9 0.47 - 2.51 0.05 0.0021 10 0.48 - 2.25 0.06 0.0019 11 0.46 - 2.74 0.07 0.0030 12 0.44 - 3.26 0.10 0.0015

[0094] Table 2. Heat treatment process and performance of wear-resistant and friction-reducing oil drill pipe joints in the examples.

[0095]

[0096] The performance of the wear-resistant strip of the oil drill pipe joint prepared according to the chemical composition in Table 1 and the process in Table 2 is shown in Table 2. Its surface hardness is in the range of 55HRC to 60HRC, and the hardened layer depth is 3.01 to 3.49 mm; the surface is free of defects, and the hardened layer is well bonded to the matrix; it has good wear resistance and friction reduction properties, and its service life is significantly extended. The wear-resistant and friction-reducing oil drill pipe joint has a simple preparation process, low production and use costs, and can meet the requirements of oil and gas wells under complex operating conditions to prevent drill pipe joint wear and protect the casing.

[0097] The above content is only for illustrating the technical concept of the present invention and should not be construed as limiting the scope of protection of the present invention. Any modifications made to the technical solution based on the technical concept proposed in this invention shall fall within the scope of protection of the claims of this invention.

Claims

1. A galling and friction reducing wear strip for a petroleum drill pipe joint, characterized by, The anti-wear and friction-reducing petroleum drill pipe joint wear-resistant band comprises the following components in percentage by mass: 0.43-0.48% of C, 1.95-2.70% of Cr+Mn+Mo, 0.05-0.1% of V, 0.0015-0.0030% of B, 0.17-0.39% of Si, ≤0.015% of P, ≤0.005% of S and inevitable impurities. The anti-wear and friction-reducing petroleum drill pipe joint wear-resistant band is prepared by the following steps: S1: designing the alloy components of the petroleum drill pipe joint, and performing forming treatment according to the component design to obtain a pretreated petroleum drill pipe joint, wherein the components of the pretreated petroleum drill pipe joint are the components of the anti-wear and friction-reducing petroleum drill pipe joint wear-resistant band; S2: performing surface strengthening heat treatment on the pretreated petroleum drill pipe joint to obtain an anti-wear and friction-reducing petroleum drill pipe joint wear-resistant band on the surface of the petroleum drill pipe joint. The process parameters of the surface strengthening heat treatment are as follows: first, an induction heating quenching mode is used, wherein the frequency of the induction heating equipment is 5 kHz-10 kHz, the heating temperature is 870 DEG C-920 DEG C, the heating time is 4 s-7 s, the moving speed of the pretreated petroleum drill pipe joint relative to the induction heating ring is 4.3 mm / s-7.5 mm / s, and the induction heating is immediately cooled by water spraying; immediately after the induction heating quenching, the induction heating tempering is performed, the specific power of the induction heating tempering is 2 kW / cm 2 , the frequency is 3 kHz, the heating temperature is 180 DEG C-200 DEG C, the heating time is 10 s, and the moving speed of the pretreated petroleum drill pipe joint relative to the induction heating ring is 3 mm / s.

2. A galling and friction reducing wear strip for a petroleum drill pipe joint, characterized by, The anti-wear and friction-reducing petroleum drill pipe joint wear-resistant band comprises the following components in percentage by mass: 0.43-0.48% of C, 2.25-3.50% of Cr+Ni+Mn+Mo, 0.05-0.1% of V, 0.0015-0.0030% of B, 0.17-0.39% of Si, ≤0.015% of P, ≤0.005% of S and inevitable impurities. The anti-wear and friction-reducing petroleum drill pipe joint wear-resistant band is prepared by the following steps: S1: designing the alloy components of the petroleum drill pipe joint, and performing forming treatment according to the component design to obtain a pretreated petroleum drill pipe joint, wherein the components of the pretreated petroleum drill pipe joint are the components of the anti-wear and friction-reducing petroleum drill pipe joint wear-resistant band; S2: performing surface strengthening heat treatment on the pretreated petroleum drill pipe joint to obtain an anti-wear and friction-reducing petroleum drill pipe joint wear-resistant band on the surface of the petroleum drill pipe joint. The process parameters of the surface strengthening heat treatment are as follows: first, an induction heating quenching mode is used, wherein the frequency of the induction heating equipment is 5 kHz-10 kHz, the heating temperature is 870 DEG C-920 DEG C, the heating time is 4 s-7 s, the moving speed of the pretreated petroleum drill pipe joint relative to the induction heating ring is 4.3 mm / s-7.5 mm / s, and the induction heating is immediately cooled by water spraying; immediately after the induction heating quenching, the induction heating tempering is performed, the specific power of the induction heating tempering is 2 kW / cm 2 , the frequency is 3 kHz, the heating temperature is 180 DEG C-200 DEG C, the heating time is 10 s, and the moving speed of the pretreated petroleum drill pipe joint relative to the induction heating ring is 3 mm / s.

3. A method of making a wear-resistant strip for a wear-resistant, friction-reducing oilfield drill pipe joint according to claim 1 or 2, characterized in that, The anti-wear and friction-reducing petroleum drill pipe joint wear-resistant band is prepared by the following steps: S1: designing the alloy components of the petroleum drill pipe joint, and performing forming treatment according to the component design to obtain a pretreated petroleum drill pipe joint, wherein the components of the pretreated petroleum drill pipe joint are the components of the anti-wear and friction-reducing petroleum drill pipe joint wear-resistant band; S2: performing surface strengthening heat treatment on the pretreated petroleum drill pipe joint to obtain an anti-wear and friction-reducing petroleum drill pipe joint wear-resistant band on the surface of the petroleum drill pipe joint. The process parameters of the surface strengthening heat treatment are as follows: first, an induction heating quenching mode is used, wherein the frequency of the induction heating equipment is 5 kHz-10 kHz, the heating temperature is 870 DEG C-920 DEG C, the heating time is 4 s-7 s, the moving speed of the pretreated petroleum drill pipe joint relative to the induction heating ring is 4.3 mm / s-7.5 mm / s, and the induction heating is immediately cooled by water spraying; immediately after the induction heating quenching, the induction heating tempering is performed, the specific power of the induction heating tempering is 2 kW / cm 2 , the frequency is 3 kHz, the heating temperature is 180 DEG C-200 DEG C, the heating time is 10 s, and the moving speed of the pretreated petroleum drill pipe joint relative to the induction heating ring is 3 mm / s.

4. A method of making a wear strip for a wear-reducing oil drill pipe joint according to claim 3, characterized in that, In S1, the forming treatment comprises steelmaking treatment, continuous casting, hot continuous rolling in the austenite zone, die forging and quenching and tempering heat treatment; and the microstructure of the pretreated petroleum drill pipe joint is tempered sorbite.

5. The method for preparing a wear-resistant belt for an anti-wear and friction-reducing oil drill pipe joint according to claim 3, characterized in that, In S1, the outer diameter of the pretreated petroleum drill pipe joint is 91.7-227.9 mm.

6. The method for preparing a wear-resistant belt for an anti-wear and friction-reducing oil drill pipe joint according to claim 3, characterized in that, In S2, after the surface strengthening heat treatment, a heated quenching band is formed on the surface of the pretreated petroleum drill pipe joint; and the length of the heated quenching band is 51-102 mm.

7. The method for preparing a wear-resistant belt for an anti-wear and friction-reducing oil drill pipe joint according to claim 3, characterized in that, In S2, the surface hardness of the anti-wear and friction-reducing petroleum drill pipe joint wear-resistant band is not less than 55HRC, and the depth of the hardened layer is not less than 3 mm.

8. The use of an anti-friction wear strip for a petroleum drill pipe joint as claimed in claim 1 or 2, characterized in that, When the wear-resistant and friction-reducing strip of the petroleum drill pipe joint is worn after working, the worn part is polished, and the surface of the wear-resistant and friction-reducing strip of the petroleum drill pipe joint is repeatedly subjected to surface strengthening heat treatment for reuse.

9. The use of an anti-friction wear strip for a petroleum drill pipe joint according to claim 8, characterized in that, When the wear-resistant and friction-reducing strip of the petroleum drill pipe joint is worn to a decrease of 2.5mm-3mm in the outer diameter after working, the worn part is polished, and the surface of the wear-resistant and friction-reducing strip of the petroleum drill pipe joint is repeatedly subjected to surface strengthening heat treatment once. The number of times of the surface strengthening heat treatment is 2-3 times.

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