Anti-wear and anti-friction petroleum drill rod joint wear-resistant belt and preparation method and application thereof

Abstract

The invention discloses an anti-wear and anti-friction petroleum drill rod joint wear-resistant belt and a preparation method and application thereof, and belongs to the technical field of petroleum drill rod joint protection. According to the anti-abrasion and anti-friction petroleum drill rod joint wear-resistant belt, the components of the wear-resistant and anti-friction petroleum drill rod joint wear-resistant belt are optimally designed, C is adopted, Mn, Cr, Ni, Mo and B are added for alloying, V is adopted for microalloying, the outer diameter of a drill rod joint is properly increased, quenching and tempering heat treatment is carried out, and the surface wear-resistant belt is prepared by adopting a surface strengthening heat treatment process of induction heating quenching and induction tempering. The drill rod joint has good strength and toughness, the surface of the drill rod joint has high hardness and wear-resisting and friction-reducing performance, the drill rod joint can be repeatedly processed and utilized for 2-3 times, the defects of a traditional wear-resisting belt are avoided, the process is simplified, and the cost is saved.

Description

Technical Field

[0001] The invention belongs to the technical field of oil drill pipe joint protection, and in particular relates to an anti-wear and friction-reducing wear-resistant belt for oil drill pipe joints, a preparation method and application thereof. Background Art

[0002] Drill pipe is an important tool for rotary drilling in oil and gas development. The wear of drill pipe joints is one of the main reasons for the reduction of drill pipe life and early failure. During the drilling process, the outer surface of the joint is either in contact with the formation (open hole section), causing wear of the outer diameter of the drill pipe joint, resulting in a reduction in its strength and service life; or in contact with the outer casing (casing section), causing casing wear, resulting in reduced strength and service life. In severe cases, the entire well will be scrapped, causing significant economic losses. Therefore, it is required that the outer diameter wear-resistant part of the drill pipe joint can both resist formation wear and reduce wear on the casing. In order to improve the wear resistance of the drill pipe joint, it is usually practiced to weld a wear-resistant belt on the outer diameter part of the drill pipe joint. The wear-resistant belt material has developed from the earliest WC cemented carbide to amorphous Cr alloy, Cr-Mn-Mo iron-based alloy, Ni-B-Nb iron-based alloy, diamond composite alloy and other materials, and its wear resistance and friction reduction performance and process performance have been greatly improved. But in general: the surface of these wear-resistant belts is uneven, which causes great damage to the casing during use; the wear-resistant belt material is quite different from the base material, and the bonding strength is poor; there are often microcracks on the surface, which are easy to fall off during use; the welding process is complicated, and the welding quality control is difficult. Summary of the invention

[0003] The purpose of the present invention is to provide a wear-resistant and friction-reducing wear-resistant belt for oil drill pipe joints and a preparation method and application thereof, so as to solve the technical problems that the existing wear-resistant belts cause great damage to the casing during use, have poor bonding strength with the base material, are easy to fall off, and have great difficulty in quality control of the welding process.

[0004] In order to achieve the above object, the present invention adopts the following technical solutions:

[0005] The invention discloses an anti-wear and friction-reducing wear-resistant belt for a petroleum drill pipe joint. The anti-wear and friction-reducing wear-resistant belt for a petroleum drill pipe joint comprises, by mass percentage, 0.43% to 0.48% of C, 1.95% to 2.70% of Cr+Mn+Mo, 0.05% to 0.1% of V, 0.0015% to 0.0030% of B, 0.17% to 0.39% of Si, ≤0.015% of P, ≤0.005% of S and the remainder of inevitable impurities.

[0006] The invention also discloses an anti-wear and friction-reducing wear-resistant belt for a petroleum drill pipe joint. The components of the anti-wear and friction-reducing wear-resistant belt for a petroleum drill pipe joint include, by mass percentage, 0.43% to 0.48% of C, 2.25% to 3.50% of Cr+Ni+Mn+Mo, 0.05% to 0.1% of V, 0.0015% to 0.0030% of B, 0.17% to 0.39% of Si, ≤0.015% of P, ≤0.005% of S and the remainder of inevitable impurities.

[0007] The present invention also discloses a method for preparing the two anti-wear and friction-reducing wear-resistant belts for oil drill pipe joints, comprising the following steps:

[0008] S1: Designing the alloy composition of the oil drill pipe joint, and performing forming treatment according to the composition design to obtain a pretreated oil drill pipe joint, wherein the composition of the pretreated oil drill pipe joint is the above-mentioned two anti-wear and friction-reducing oil drill pipe joint wear-resistant belt composition;

[0009] S2: Performing surface strengthening heat treatment on the pretreated oil drill pipe joint to obtain an anti-wear and friction-reducing oil drill pipe joint wear-resistant belt on the surface of the oil drill pipe joint.

[0010] Furthermore, in S1, the forming process comprises: steelmaking, continuous casting, hot rolling in austenite zone, die forging and quenching and tempering heat treatment; the microstructure of the pre-treated oil drill pipe joint is tempered troostite.

[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 of the surface strengthening heat treatment are: firstly adopt the induction heating quenching method, wherein the frequency of the induction heating equipment is 5kHz~10kHz, the heating temperature is 870℃~920℃, the heating time is 4s~7s, the moving speed of the pretreated oil drill pipe joint relative to the induction heating ring is 4.3mm / s~7.5mm / s, and water spray cooling is immediately performed after induction heating; induction heating tempering is immediately performed after the induction heating quenching is completed, and the specific power of induction heating tempering is 2kW / cm 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 ring is 3mm / s.

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

[0014] Furthermore, in S2, the surface hardness of the wear-resistant belt 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 wear-resistant belt of the anti-friction and friction-reducing oil drill pipe joint. When the wear-resistant belt of the anti-friction and friction-reducing oil drill pipe joint is worn after work, the worn part is polished and the surface of the wear-resistant belt of the anti-friction and friction-reducing oil drill pipe joint is repeatedly subjected to surface strengthening heat treatment for repeated use.

[0016] Further, when the wear-resistant belt of the anti-friction and anti-friction oil drill pipe joint is worn to a size reduction of 2.5 mm to 3 mm in outer diameter after operation, the worn portion is polished, and a surface strengthening heat treatment is repeatedly performed on the surface of the wear-resistant belt of the anti-friction and anti-friction 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] The invention discloses a wear-resistant belt for a petroleum drill pipe joint that prevents wear and reduces friction. The components of the belt are designed by using medium C, adding Mn, Cr, Ni, Mo, B for alloying, and V for microalloying. The C content of 0.43% to 0.48% is used to ensure hardenability and surface hardness, and the carbon content is increased compared with that of an ordinary drill pipe joint. The C content of 0.43% to 0.48% is combined with the reinforcement of the Cr-Mn-Mo system of 1.95% to 2.70%, thereby improving the hardenability of the steel, thereby improving the strength and toughness, and can also improve the tempering stability of the steel. Qualitatively, carbides containing Cr and Mo can improve surface hardness and wear resistance; in addition, the C content of 0.43% to 0.48% combined with the reinforcement of 2.25% to 3.50% of the Cr-Ni-Mn-Mo system improves the hardenability of the steel, thereby improving the strength and toughness, and can improve the tempering stability of the steel. Carbides containing Cr and Mo can improve the hardness and wear resistance of the surface hardened layer; the selection of the reinforcing phase combined with the addition of V and B, the entire composition as a whole, improves the strength and toughness, and improves the surface hardness of the hardened layer.

[0020] The present invention also discloses a method for preparing the wear-resistant belt of the above-mentioned anti-wear and friction-reducing oil drill pipe joint, which directly performs surface strengthening heat treatment on the surface of the oil drill pipe joint after the component design, so as to form a wear-resistant belt that is well bonded with a matrix on the surface of the oil drill pipe joint, the surface hardness of the wear-resistant belt of the drill pipe joint is not less than 55HRC, the depth of the hardened layer is not less than 3mm, the surface is free of defects, the hardened layer is well bonded with the matrix, and the whole structure is integrated, which solves the technical problem that the wear-resistant belt material is quite different from the matrix material and the bonding strength is poor; in addition, the preparation process is simplified, the production and use cost of the drill pipe joint is significantly reduced, and the requirements of oil and gas wells with complex working conditions that both the wear of the drill pipe joint and the protection of the casing can be met.

[0021] The present invention also discloses the application of the wear-resistant belt for oil drill pipe joints. When in use, the worn wear-resistant belt can be repeatedly processed 2 to 3 times, has good wear-resistant and friction-reducing performance, and significantly extends the service life. The drill pipe joint can reduce the wear of the formation on the drill pipe, and significantly reduce the wear of the wear-resistant belt on the outer surface of the drill pipe joint on the casing, and can be reused, the process is simple, and the service life of the drill pipe joint and the drill pipe is significantly improved. The component design and the wear-resistant belt preparation process are not only applicable to drill pipe joints, but also applicable to drill collars and other downhole tools. DETAILED DESCRIPTION

[0022] In order to enable those skilled in the art to understand the characteristics and effects of the present invention, the following is a general description and definition of the terms and expressions mentioned in the specification and claims. Unless otherwise specified, all technical and scientific terms used in the text are the common meanings understood by those skilled in the art for the present invention. In the event of a conflict, the definition in this specification shall prevail.

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

[0024] Herein, all features such as values, quantities, contents and concentrations defined in the form of numerical ranges or percentage ranges are for simplicity and convenience only. Accordingly, the description of numerical ranges or percentage ranges should be considered to have included and specifically disclosed all possible secondary ranges and individual values ​​within the range (including integers and fractions).

[0025] In this document, unless otherwise specified, “includes,” “including,” “contains,” “has,” or similar terms cover the meanings of “consisting of” and “mainly consisting of,” for example, “A includes a” covers the meanings of “A includes a and other” and “A only includes a.”

[0026] In this document, in order to make the description concise, not all possible combinations of various technical features in various embodiments or examples are described. Therefore, as long as there is no contradiction in the combination of these technical features, the various technical features in various embodiments or examples can be combined arbitrarily, and all possible combinations should be considered to be within the scope of this specification.

[0027] The invention provides a drill pipe joint wear-resistant belt with a surface hardness of not less than 55HRC, a hardened layer depth of not less than 3mm, no surface defects, good combination of the hardened layer and the matrix, wear resistance and friction reduction, and repeatable processing and utilization after wear, and a preparation method thereof. When designing the composition, the wear-resistant and friction-reducing oil drill pipe joint wear-resistant belt comprises, by mass percentage, 0.43% to 0.48% of C, 1.95% to 2.70% of Cr+Mn+Mo, 0.05% to 0.1% of V, 0.0015% to 0.0030% of B, 0.17% to 0.39% of Si, ≤0.015% of P, ≤0.005% of S and the remainder of inevitable impurities.

[0028] Alternatively, the components of the wear-resistant and friction-reducing oil drill pipe joint wear-resistant belt include, by mass percentage, 0.43% to 0.48% C, 2.25% to 3.50% Cr+Ni+Mn+Mo, 0.05% to 0.1% V, 0.0015% to 0.0030% B, 0.17% to 0.39% Si, ≤0.015% P, ≤0.005% S and the remainder of inevitable impurities.

[0029] Among them, in order to ensure the comprehensive mechanical properties, surface hardness and hardened layer depth of the drill pipe joint and its wear-resistant belt during the above composition design, medium C is used, Mn, Cr, Ni, Mo, B are alloyed, and V is micro-alloyed. The functions and content ranges of the main elements are explained as follows:

[0030] C: It is a strengthening element in steel, but too low carbon content is not conducive to improving the hardenability and hardenability of steel, and is not conducive to improving the strength and surface hardness of steel; too high carbon content is not conducive to the toughness of steel. In order 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 system: mainly used to improve the hardenability of steel, thereby improving strength and toughness, and can improve the tempering stability of steel. Carbides containing Cr and Mo can improve surface hardness and wear resistance. Cr+Mn+Mo 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 improving strength and toughness, and can improve the tempering stability of steel. Carbides containing Cr and Mo can improve the hardness and wear resistance of the surface hardened layer. Cr+Ni+Mn+Mo should be controlled within the range of 2.25% to 3.50%.

[0033] V: added to steel to form VC and VN with C and N in steel, which has the effect of hindering the growth of austenite grains and refining grains, thereby improving strength and toughness, and also improving the surface hardness of the hardened layer. It is best to control it within the range of 0.05% to 0.10%.

[0034] B: Adding it to steel can significantly improve the hardenability of the steel and thus improve the strength of the steel, and can also increase the surface hardness of the hardened layer, but too high a content will cause boron embrittlement. It is best to control it within the range of 0.0015% to 0.0030%.

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

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

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

[0038] During the preparation, the material is made to obtain a fine and uniform tempered sorbite microstructure through processes such as steelmaking (including refining outside the furnace, Ca treatment, vacuum degassing), continuous casting, hot rolling in the austenite zone, die forging, and tempering heat treatment, so as to achieve a reasonable match between the strength and plastic toughness of the drill pipe joint and obtain a pretreated oil drill pipe joint.

[0039] Then the surface of the pre-treated oil drill pipe joint is subjected to surface strengthening heat treatment and induction heating quenching with a specific power of 0.6-1.0kW / cm 2 , the frequency of induction heating equipment is 5kHz~10kHz, the heating temperature is 870℃~920℃, the heating time is 4s~7s, the moving speed of drill pipe joint relative to induction heating ring is 4.3mm / s~7.5mm / s, and water is sprayed for cooling immediately after induction heating. The length of heating quenching belt is 51mm~102mm, and the specific size is in accordance with relevant standards or user requirements. After induction heating quenching is completed, induction heating tempering is carried out immediately, with a specific power of 2kW / cm 2 , frequency 3kHz, heating temperature 180℃~200℃, heating time 10s, and the moving speed of the drill pipe joint relative to the induction heating ring is 3mm / s.

[0040] The outer diameter of the drill pipe joint is 6mm to 12mm larger than that of the ordinary drill pipe joint (i.e., 6mm to 12mm larger than the standard outer diameter of 85.7mm to 215.9mm). When the outer diameter is reduced by 2.5mm to 3mm due to wear, the outer surface is polished and surface quenching is performed again. In this way, the drill pipe joint can be repeatedly surface quenched 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 described below in conjunction with specific embodiments. It should be understood that these embodiments are only used to illustrate the present invention and are not intended to limit the scope of the present invention. In addition, it should be understood that after reading the content taught by the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms fall within the scope limited by the appended claims of the application equally.

[0042] The following examples use conventional instruments and equipment in the art. The experimental methods in the following examples where specific conditions are not specified are usually carried out under conventional conditions or under conditions recommended by the manufacturer. The various raw materials used in the following examples are conventional commercial products unless otherwise specified, and their specifications are conventional specifications in the art. In the specification of the present invention and the following examples, unless otherwise specified, "%" means weight percentage, "part" means weight part, and ratio means weight ratio.

[0043] Example 1

[0044] A method for preparing a wear-resistant belt for a petroleum drill pipe joint that prevents wear and reduces friction comprises the following steps:

[0045] S1: Designing the alloy composition of the oil drill pipe joint, and performing forming treatment according to the composition design to obtain a pretreated oil drill pipe joint, wherein the composition of the pretreated oil drill pipe joint, in terms of mass percentage, includes: 0.43% C, 2.70% Cr+Mn+Mo, 0.1% V and 0.0027% B;

[0046] S2: The pre-treated oil drill pipe joint is first subjected to induction heating quenching, wherein the induction heating equipment frequency is 5kHz, the heating temperature is 870-890℃, the heating time is 4s, and the specific power is 1.00kW / cm 2 The moving speed of the pre-treated oil drill pipe joint relative to the induction heating ring is 7.5mm / s, and it is immediately cooled by spraying water after induction heating; induction heating tempering is immediately carried out after induction heating quenching is completed, and the specific power of induction heating tempering is 2kW / cm 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 ring is 3mm / s. After completion, an anti-wear 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 depth of the hardened layer is 3.30mm.

[0047] Example 2

[0048] A method for preparing a wear-resistant belt for a petroleum drill pipe joint that prevents wear and reduces friction comprises the following steps:

[0049] S1: Designing the alloy composition of the oil drill pipe joint, and performing forming treatment according to the composition design to obtain a pretreated oil drill pipe joint, wherein the composition of the pretreated oil drill pipe joint, in terms of mass percentage, includes: 0.45% C, 2.41% Cr+Mn+Mo, 0.07% V and 0.0018% B;

[0050] S2: The pre-treated oil drill pipe joint is first subjected to induction heating quenching, wherein the induction heating equipment frequency is 5kHz, the heating temperature is 870-890℃, the heating time is 4s, and the specific power is 1.00kW / cm 2 The moving speed of the pre-treated oil drill pipe joint relative to the induction heating ring is 7.5mm / s, and it is immediately cooled by spraying water after induction heating; induction heating tempering is immediately carried out after induction heating quenching is completed, and the specific power of induction heating tempering is 2kW / cm 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 ring is 3mm / s. After completion, an anti-wear 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 depth of the hardened layer is 3.12mm.

[0051] Example 3

[0052] A method for preparing a wear-resistant belt for a petroleum drill pipe joint that prevents wear and reduces friction comprises the following steps:

[0053] S1: Designing the alloy composition of the oil drill pipe joint, and performing forming treatment according to the composition design to obtain a pretreated oil drill pipe joint, wherein the composition of the pretreated oil drill pipe joint, in terms of mass percentage, includes: 0.48% C, 1.95% Cr+Mn+Mo, 0.05% V and 0.0022% B;

[0054] S2: The pre-treated oil drill pipe joint is first subjected to induction heating quenching, wherein the induction heating equipment frequency is 5kHz, the heating temperature is 870-890℃, the heating time is 4s, and the specific power is 1.00kW / cm 2 The moving speed of the pre-treated oil drill pipe joint relative to the induction heating ring is 7.5mm / s, and it is immediately cooled by spraying water after induction heating; induction heating tempering is immediately carried out after induction heating quenching is completed, and the specific power of induction heating tempering is 2kW / cm 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 ring is 3mm / s. After completion, an anti-wear 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 depth of the hardened layer is 3.01mm.

[0055] Example 4

[0056] A method for preparing a wear-resistant belt for a petroleum drill pipe joint that prevents wear and reduces friction comprises the following steps:

[0057] S1: Designing the alloy composition of the oil drill pipe joint, and performing forming treatment according to the composition design to obtain a pretreated oil drill pipe joint, wherein the composition of the pretreated oil drill pipe joint, in terms of mass percentage, includes: 0.47% C, 2.11% Cr+Mn+Mo, 0.06% V and 0.0015% B;

[0058] S2: The pre-treated oil drill pipe joint is first subjected to induction heating quenching, wherein the induction heating equipment frequency is 5kHz, the heating temperature is 880-900℃, the heating time is 5s, and the specific power is 0.85kW / cm 2 The moving speed of the pre-treated oil drill pipe joint relative to the induction heating ring is 6.0mm / s, and it is immediately cooled by water spray after induction heating; induction heating tempering is immediately carried out after induction heating quenching is completed, and the specific power of induction heating tempering is 2kW / cm 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 ring is 3mm / s. After completion, an anti-wear 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 depth of the hardened layer is 3.07mm.

[0059] Example 5

[0060] A method for preparing a wear-resistant belt for a petroleum drill pipe joint that prevents wear and reduces friction comprises the following steps:

[0061] S1: Designing the alloy composition of the oil drill pipe joint, and performing forming treatment according to the composition design to obtain a pretreated oil drill pipe joint, wherein the composition of the pretreated oil drill pipe joint, in terms of mass percentage, includes: 0.44% C, 2.54% Cr+Mn+Mo, 0.09% V and 0.003% B;

[0062] S2: The pre-treated oil drill pipe joint is first subjected to induction heating quenching, wherein the induction heating equipment frequency is 5kHz, the heating temperature is 880-900℃, the heating time is 5s, and the specific power is 0.85kW / cm 2 The moving speed of the pre-treated oil drill pipe joint relative to the induction heating ring is 6.0mm / s, and it is immediately cooled by water spray after induction heating; induction heating tempering is immediately carried out after induction heating quenching is completed, and the specific power of induction heating tempering is 2kW / cm 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 ring is 3mm / s. After completion, an anti-wear 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 depth of the hardened layer is 3.19mm.

[0063] Example 6

[0064] A method for preparing a wear-resistant belt for a petroleum drill pipe joint that prevents wear and reduces friction comprises the following steps:

[0065] S1: Designing the alloy composition of the oil drill pipe joint, and performing forming treatment according to the composition design to obtain a pretreated oil drill pipe joint, wherein the composition of the pretreated oil drill pipe joint, in terms of mass percentage, includes: 0.46% C, 2.24% Cr+Mn+Mo, 0.08% V and 0.0024% B;

[0066] S2: The pre-treated oil drill pipe joint is first subjected to induction heating quenching, wherein the induction heating equipment frequency is 5kHz, the heating temperature is 880-900℃, the heating time is 5s, and the specific power is 0.85kW / cm 2 The moving speed of the pre-treated oil drill pipe joint relative to the induction heating ring is 6.0mm / s, and it is immediately cooled by water spray after induction heating; induction heating tempering is immediately carried out after induction heating quenching is completed, and the specific power of induction heating tempering is 2kW / cm 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 ring is 3mm / s. After completion, an anti-wear 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 depth of the hardened layer is 3.31mm.

[0067] Example 7

[0068] A method for preparing a wear-resistant belt for a petroleum drill pipe joint that prevents wear and reduces friction comprises the following steps:

[0069] S1: Designing the alloy composition of the oil drill pipe joint, and performing forming treatment according to the composition design to obtain a pretreated oil drill pipe joint, wherein the composition of the pretreated oil drill pipe joint, in terms of mass percentage, includes: 0.45% C, 2.99% Cr+Ni+Mn+Mo, 0.08% V and 0.0025% B;

[0070] S2: The pre-treated oil drill pipe joint is first subjected to induction heating quenching, wherein the induction heating equipment frequency is 10kHz, the heating temperature is 890-910℃, the heating time is 6s, and the specific power is 0.7kW / cm 2 The moving speed of the pre-treated oil drill pipe joint relative to the induction heating ring is 5.0mm / s, and it is immediately cooled by water spray after induction heating; induction heating tempering is immediately carried out after induction heating quenching is completed, and the specific power of induction heating tempering is 2kW / cm 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 ring is 3mm / s. After completion, an anti-wear 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 depth of the hardened layer is 3.37mm.

[0071] Example 8

[0072] A method for preparing a wear-resistant belt for a petroleum drill pipe joint that prevents wear and reduces friction comprises the following steps:

[0073] S1: Designing the alloy composition of the oil drill pipe joint, and performing forming treatment according to the composition design to obtain a pretreated oil drill pipe joint, wherein the composition of the pretreated oil drill pipe joint, in terms of mass percentage, includes: 0.43% C, 3.5% Cr+Ni+Mn+Mo, 0.09% V and 0.0026% B;

[0074] S2: The pre-treated oil drill pipe joint is first subjected to induction heating quenching, wherein the induction heating equipment frequency is 10kHz, the heating temperature is 890-910℃, the heating time is 6s, and the specific power is 0.7kW / cm 2 The moving speed of the pre-treated oil drill pipe joint relative to the induction heating ring is 5.0mm / s, and it is immediately cooled by water spray after induction heating; induction heating tempering is immediately carried out after induction heating quenching is completed, and the specific power of induction heating tempering is 2kW / cm 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 ring is 3mm / s. After completion, an anti-wear 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 depth of the hardened layer is 3.49mm.

[0075] Example 9

[0076] A method for preparing a wear-resistant belt for a petroleum drill pipe joint that prevents wear and reduces friction comprises the following steps:

[0077] S1: Designing the alloy composition of the oil drill pipe joint, and performing forming treatment according to the composition design to obtain a pretreated oil drill pipe joint, wherein the composition of the pretreated oil drill pipe joint, in terms of mass percentage, includes: 0.47% C, 2.51% Cr+Ni+Mn+Mo, 0.05% V and 0.0021% B;

[0078] S2: The pre-treated oil drill pipe joint is first subjected to induction heating quenching, wherein the induction heating equipment frequency is 10kHz, the heating temperature is 890-910℃, the heating time is 6s, and the specific power is 0.7kW / cm 2 The moving speed of the pre-treated oil drill pipe joint relative to the induction heating ring is 5.0mm / s, and it is immediately cooled by water spray after induction heating; induction heating tempering is immediately carried out after induction heating quenching is completed, and the specific power of induction heating tempering is 2kW / cm 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 ring is 3mm / s. After completion, an anti-wear 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 depth of the hardened layer is 3.26mm.

[0079] Example 10

[0080] A method for preparing a wear-resistant belt for a petroleum drill pipe joint that prevents wear and reduces friction comprises the following steps:

[0081] S1: Designing the alloy composition of the oil drill pipe joint, and performing forming treatment according to the composition design to obtain a pretreated oil drill pipe joint, wherein the composition of the pretreated oil drill pipe joint, in terms of mass percentage, includes: 0.48% C, 2.25% Cr+Ni+Mn+Mo, 0.06% V and 0.0019% B;

[0082] S2: The pre-treated oil drill pipe joint is first subjected to induction heating quenching, wherein the induction heating equipment frequency is 10kHz, the heating temperature is 900-920℃, the heating time is 7s, and the specific power is 0.6kW / cm 2 The moving speed of the pre-treated oil drill pipe joint relative to the induction heating ring is 4.3mm / s, and it is immediately cooled by water spray after induction heating; induction heating tempering is immediately carried out after induction heating quenching is completed, and the specific power of induction heating tempering is 2kW / cm 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 ring is 3mm / s. After completion, an anti-wear 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 depth of the hardened layer is 3.21mm.

[0083] Embodiment 11

[0084] A method for preparing a wear-resistant belt for a petroleum drill pipe joint that prevents wear and reduces friction comprises the following steps:

[0085] S1: Designing the alloy composition of the oil drill pipe joint, and performing forming treatment according to the composition design to obtain a pretreated oil drill pipe joint, wherein the composition of the pretreated oil drill pipe joint, in terms of mass percentage, includes: 0.46% C, 2.74% Cr+Ni+Mn+Mo, 0.07% V and 0.0030% B;

[0086] S2: The pre-treated oil drill pipe joint is first subjected to induction heating quenching, wherein the induction heating equipment frequency is 10kHz, the heating temperature is 900-920℃, the heating time is 7s, and the specific power is 0.6kW / cm 2 The moving speed of the pre-treated oil drill pipe joint relative to the induction heating ring is 4.3mm / s, and it is immediately cooled by water spray after induction heating; induction heating tempering is immediately carried out after induction heating quenching is completed, and the specific power of induction heating tempering is 2kW / cm 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 ring is 3mm / s. After completion, an anti-wear 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 depth of the hardened layer is 3.32mm.

[0087] Example 12

[0088] A method for preparing a wear-resistant belt for a petroleum drill pipe joint that prevents wear and reduces friction comprises the following steps:

[0089] S1: Designing the alloy composition of the oil drill pipe joint, and performing forming treatment according to the composition design to obtain a pretreated oil drill pipe joint, wherein the composition of the pretreated oil drill pipe joint, in terms of mass percentage, includes: 0.44% C, 3.26% Cr+Ni+Mn+Mo, 0.10% V and 0.0015% B;

[0090] S2: The pre-treated oil drill pipe joint is first subjected to induction heating quenching, wherein the induction heating equipment frequency is 10kHz, the heating temperature is 900-920℃, the heating time is 7s, and the specific power is 0.6kW / cm 2 The moving speed of the pre-treated oil drill pipe joint relative to the induction heating ring is 4.3mm / s, and it is immediately cooled by water spray after induction heating; induction heating tempering is immediately carried out after induction heating quenching is completed, and the specific power of induction heating tempering is 2kW / cm 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 ring is 3mm / s. After completion, an anti-wear 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 depth of the hardened layer is 3.42mm.

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

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

[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 embodiment

[0095]

[0096] The performance of the wear-resistant belt 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 depth of the hardened layer is 3.01 to 3.49mm; the surface has no defects, and the hardened layer is well combined with the matrix; the wear-resistant and friction-reducing performance is good, and the service life is significantly extended. The preparation process of the wear-resistant and friction-reducing oil drill pipe joint is simple, and the production and use cost is low. It can meet the requirements of oil and gas wells with complex working conditions to prevent the wear of the drill pipe joint and protect the casing.

[0097] The above contents are only for explaining the technical idea of ​​the present invention and cannot be used to limit the protection scope of the present invention. Any changes made on the basis of the technical solution in accordance with the technical idea proposed by the present invention shall fall within the protection scope of the claims of the present invention.

Claims

1. A wear-resistant belt for a petroleum drill pipe joint, characterized in that: Measured in percentage by mass, the components of the wear-resistant and friction-reducing wear-resistant belt of the oil drill pipe joint include: 0.43% to 0.48% C, 1.95% to 2.70% Cr+Mn+Mo, 0.05% to 0.1% V, 0.0015% to 0.0030% B, 0.17% to 0.39% Si, ≤0.015% P, ≤0.005% S and the balance of inevitable impurities.

2. A wear-resistant belt for a petroleum drill pipe joint, characterized in that: Measured in percentage by mass, the components of the wear-resistant and friction-reducing wear-resistant belt of the oil drill pipe joint include: 0.43% to 0.48% C, 2.25% to 3.50% Cr+Ni+Mn+Mo, 0.05% to 0.1% V, 0.0015% to 0.0030% B, 0.17% to 0.39% Si, ≤0.015% P, ≤0.005% S and the balance of inevitable impurities.

3. The method for preparing a wear-resistant belt for a petroleum drill pipe joint according to claim 1 or 2, characterized in that: The following steps are involved: S1: Designing the alloy composition of the oil drill pipe joint, and performing forming treatment according to the composition design to obtain a pretreated oil drill pipe joint, wherein the composition of the pretreated oil drill pipe joint is the wear-resistant belt composition of the anti-wear and friction-reducing oil drill pipe joint described in claim 1 or claim 2; S2: Performing surface strengthening heat treatment on the pretreated oil drill pipe joint to obtain an anti-wear and friction-reducing oil drill pipe joint wear-resistant belt on the surface of the oil drill pipe joint.

4. The method for preparing a wear-resistant belt for a petroleum drill pipe joint according to claim 3, characterized in that: In S1, the forming process comprises: steelmaking, continuous casting, hot rolling in austenite zone, die forging and quenching and tempering heat treatment; the microstructure of the pre-treated oil drill pipe joint is tempered troostite.

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

6. The method for preparing a wear-resistant belt for a petroleum drill pipe joint according to claim 3, characterized in that: In S2, the process parameters of the surface strengthening heat treatment are: firstly adopt the induction heating quenching method, wherein the frequency of the induction heating equipment is 5kHz to 10kHz, the heating temperature is 870℃ to 920℃, the heating time is 4s to 7s, the moving speed of the pretreated oil drill pipe joint relative to the induction heating ring is 4.3mm / s to 7.5mm / s, and water spray cooling is immediately performed after induction heating; induction heating tempering is immediately performed after the induction heating quenching is completed, and the specific power of induction heating tempering is 2kW / cm 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 ring is 3mm / s.

7. The method for preparing a wear-resistant belt for a petroleum drill pipe joint according to claim 6, characterized in that: In S2, after the pre-treated oil drill pipe joint is subjected to surface strengthening heat treatment, a heating quenching zone is formed on the surface of the oil drill pipe joint; the length of the heating quenching zone is 51 mm to 102 mm.

8. The method for preparing a wear-resistant belt for a petroleum drill pipe joint according to claim 3, characterized in that: In S2, the surface hardness of the wear-resistant belt 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.

9. Application of the wear-resistant belt for anti-wear and friction-reducing oil drill pipe joint according to claim 1 or 2, characterized in that: When the wear-resistant belt of the anti-friction and anti-friction oil drill pipe joint is worn after work, the worn part is polished and the surface of the wear-resistant belt of the anti-friction and anti-friction oil drill pipe joint is repeatedly subjected to surface strengthening heat treatment for repeated use.

10. The use of the wear-resistant belt for anti-wear and friction-reducing oil drill pipe joint according to claim 9, characterized in that: When the wear-resistant belt of the anti-friction and anti-friction oil drill pipe joint is worn to a diameter reduction of 2.5mm to 3mm after operation, the worn part is polished and the surface of the wear-resistant belt of the anti-friction and anti-friction oil drill pipe joint is repeatedly subjected to a surface strengthening heat treatment; The surface strengthening heat treatment is repeated 2 to 3 times.

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