Petroleum drill rod repairing method, device and equipment

Abstract

The invention discloses a petroleum drill rod repairing method, device and equipment, relates to the technical field of petroleum drill rod repairing, and aims at solving the problem that in the prior art, damage to threads and a base body of a petroleum drill rod cannot be repaired. The method comprises the steps that a to-be-repaired area of the petroleum drill rod is machined, a damaged structure is removed, and a turning area is formed; a first repairing material is adopted for repairing the thread turning area through the cladding technology, and a first repairing layer is formed in the thread turning area; thread machining is conducted on the first repairing layer, and repairing of a thread area is completed; and forming a base coat on the surface of the turning area of the base body by adopting a second repairing material, and forming a repairing transition layer on the base coat by adopting a third repairing material. The petroleum drill rod repairing method is used for repairing the threads and the base body of the petroleum drill rod, and size recovery and performance recovery of the petroleum drill rod are guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of oil drill pipe repair, and particularly relates to a method, device and equipment for repairing oil drill pipes. Background Art

[0002] The drill pipe is one of the main components of oil drilling, and is used to connect the surface equipment of the drilling rig and the drilling and grinding equipment or bottom hole device located at the bottom of the well. The load on the drill pipe during rotation underground is relatively complex. It not only has to withstand huge internal and external pressures, torsion, bending and vibration, but also has to withstand the erosion and corrosion of high-pressure mud with corrosive media. The working environment is harsh, resulting in damage to the drill pipe and increasing the cost of drilling and well repair. The material of the drill pipe is 4145H. At present, the outer surface of the drill pipe is protected by a wear-resistant band. However, during the drilling process, the drill pipe is eccentrically worn. After the wear-resistant band layer is worn, the surface layer of the drill pipe matrix is also worn, and the diameter size of the area without the wear-resistant band decreases, which cannot meet the use requirements. Another situation is that the drill pipe thread is damaged and bent too much, and the thread damage is more common.

[0003] At present, the oil drill pipe industry directly scraps the repair of the matrix, or cuts off the worn area of the matrix and uses the inertia friction welding method to restore the original size. Because it is necessary to process and use a new section of the matrix to perform inertia friction welding with the truncated part of the drill pipe, this method is relatively expensive. For the situation of drill pipe thread damage, it is also mostly cut off and used as a short pipe. When the wear of the drill pipe matrix or the thread is too long, after multiple truncations, when the length size cannot meet the shortest drill pipe, it is scrapped.

[0004] Therefore, there is an urgent need for a method, device and equipment for repairing oil drill pipes. Summary of the Invention

[0005] The purpose of the present invention is to provide a method, device and equipment for repairing oil drill pipes, which are used to solve the problem that the matrix wear and thread wear of oil drill pipes cannot be repaired in the prior art.

[0006] In order to achieve the above purpose, the present invention provides the following technical solutions:

[0007] In the first aspect, the present invention provides a method for repairing an oil drill pipe, including:

[0008] Machining the area to be repaired of the oil drill pipe to remove the damaged structure and form a turning area; the turning area includes a thread turning area and a matrix turning area; the area to be repaired includes at least a thread area and a matrix area; the damaged structure includes the damaged structure of the thread and the damaged structure of the matrix;

[0009] Using a first repair material to repair the thread turning area through a cladding process to form a first repair layer in the thread turning area;

[0010] Thread the first repair layer to complete the repair of the threaded area;

[0011] Apply a backing layer on the surface of the machined area of the substrate with a second repair material, and apply a repair transition layer on the backing layer with a third repair material; the total thickness of the backing layer and the repair transition layer is the substrate repair thickness.

[0012] Compared with the prior art, a method for repairing an oil drill pipe provided by the present invention includes: machining the area to be repaired of the oil drill pipe to remove damaged structures and form a machined area; the machined area includes a threaded machined area and a substrate machined area; the area to be repaired includes at least a threaded area and a substrate area; repair the threaded machined area by a cladding process with a first repair material to form a first repair layer in the threaded machined area; thread the first repair layer to complete the repair of the threaded area; the powder of the first repair material has good compatibility with the substrate. After laser cladding or plasma cladding, its performance is close to that of the base material, and the strength of the repair layer can be guaranteed to be close to that of the base material without heat treatment. There are no cracks in the bonding layer and the repair layer with the base material, and the repair of the threads of the oil drill pipe can be realized, and the hardness of the threads of the oil drill pipe can meet the requirements. Apply a backing layer on the surface of the machined area of the substrate with a second repair material, and apply a repair transition layer on the backing layer with a third repair material, so as to ensure the hardness of the substrate repair layer while providing material compatibility for subsequent surfacing wear resistance, and at the same time avoid defects such as repair cracking. This solution can realize the remanufacturing of thread repair and substrate repair of oil drill pipes, and avoid the waste caused by the fact that existing oil drill pipes can only be cut off or scrapped after damage.

[0013] In a second aspect, the present invention provides an oil drill pipe repair device, including:

[0014] A machining module for machining the area to be repaired of the oil drill pipe to remove damaged structures and form a machined area; the machined area includes a threaded machined area and a substrate machined area; the area to be repaired includes at least a threaded area and a substrate area; the damaged structures include damaged structures of the threads and damaged structures of the substrate;

[0015] A thread repair module for repairing the threaded machined area by a cladding process with a first repair material to form a first repair layer in the threaded machined area;

[0016] A thread machining module for threading the first repair layer to complete the repair of the threaded area;

[0017] The matrix repair module is used to form a backing layer on the surface of the matrix turning area with a second repair material, and form a repair transition layer on the backing layer with a third repair material; the total thickness of the backing layer and the repair transition layer is the matrix repair thickness.

[0018] In a third aspect, the present invention provides an oil drill pipe repair device, including:

[0019] A communication unit / communication interface for obtaining an oil drill pipe to be repaired;

[0020] A processing unit / processor for machining the area to be repaired of the oil drill pipe to remove damaged structures and form a turning area; the turning area includes a thread turning area and a matrix turning area; the area to be repaired includes at least a thread area and a matrix area; the damaged structures include damaged structures of the thread and damaged structures of the matrix;

[0021] Repair the thread turning area with a first repair material through a cladding process to form a first repair layer in the thread turning area;

[0022] Machine the first repair layer to complete the repair of the thread area;

[0023] Form a backing layer on the surface of the matrix turning area with a second repair material, and form a repair transition layer on the backing layer with a third repair material; the total thickness of the backing layer and the repair transition layer is the matrix repair thickness.

[0024] The technical effects achieved by the device type solution provided in the second aspect and the equipment type solution provided in the third aspect are the same as those of the method type solution provided in the first aspect, and will not be elaborated here. Description of the Drawings

[0025] The drawings described herein are used to provide a further understanding of the present invention, and constitute a part of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0026] Figure 1 It is a flowchart of an oil drill pipe repair method provided by the present invention;

[0027] Figure 2 It is a flowchart of the oil drill pipe repair provided by the present invention;

[0028] Figure 3 It is a schematic structural diagram of an oil drill pipe repair device provided by the present invention;

[0029] Figure 4 It is a schematic structural diagram of an oil drill pipe repair device provided by the present invention. Detailed Embodiments

[0030] In order to clearly describe the technical solutions of the embodiments of the present invention, in the embodiments of the present invention, terms such as "first" and "second" are used to distinguish identical or similar items with basically the same functions and roles. For example, the first threshold and the second threshold are only used to distinguish different thresholds, and do not limit their order. Those skilled in the art can understand that terms such as "first" and "second" do not limit the quantity and execution order, and "first", "second", etc. do not necessarily mean different.

[0031] It should be noted that in the present invention, words such as "exemplary" or "for example" are used to represent examples, illustrations or explanations. Any embodiment or design solution described as "exemplary" or "for example" in the present invention should not be construed as being more preferred or having more advantages than other embodiments or design solutions. Rather, the use of words such as "exemplary" or "for example" is intended to present related concepts in a specific manner.

[0032] In the present invention, "at least one" means one or more, and "a plurality" means two or more. "And / or" describes the association relationship of associated objects, indicating that three relationships can exist. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone, where A and B can be singular or plural. The character " / " generally represents an "or" relationship between the associated objects before and after. "At least one (item)" or its similar expression refers to any combination of these items, including any combination of single item (item) or plural items (items). For example, at least one (item) of a, b or c can represent: a, b, c, the combination of a and b, the combination of a and c, the combination of b and c, or the combination of a, b and c, where a, b, c can be single or multiple.

[0033] The material of the oil drill pipe is 4145H and it executes the standard of SY / T 5146-2014 "Heavy Drill Pipe". During the use of the oil drill pipe, thread damage and matrix damage will occur. Since the hardness requirement of the oil drill pipe is high and it is easy to have defects such as cracking during direct repair, currently it is usually cut off or directly scrapped, and there is no method for repairing the threads and matrix of the oil drill pipe.

[0034] To solve the above problems, the present invention provides a method, device and equipment for repairing oil drill pipes, gives the matrix and thread repair methods and material formulas, and makes full use of the processes of arc surfacing, laser cladding repair and plasma cladding repair to realize the repair and remanufacture of the threads and matrix of oil drill pipes. Next, it will be described in conjunction with the accompanying drawings.

[0035] Figure 1 The flowchart of a method for repairing an oil drill pipe provided by the present invention is asFigure 1 As shown, the method includes the following steps:

[0036] Step 101: Machine the area to be repaired on the drill pipe to remove the damaged structure and form a turning area; the turning area includes a thread turning area and a matrix turning area; the damaged structure includes the damaged structure of the thread and the damaged structure of the matrix.

[0037] The area to be repaired includes at least a thread area and a matrix area; the thread area is where the thread structure is damaged, and the matrix area is where the wear-resistant layer of the drill pipe is worn out and the matrix is also worn. When repairing the thread area, before machining the area to be repaired on the drill pipe to remove the damaged structure and form a turning area, pre-repair inspection is required, specifically including:

[0038] Polish the thread area of the drill pipe, measure the size of the damaged area, and determine the depth of the damaged area; and perform non-destructive testing using fluorescence or penetrant dyeing to determine whether there are cracks in the polished thread area; if there are cracks in the thread area, machine the thread area according to the depth of the damaged area to remove the damaged structure and the crack layer and form a turning area; if there are no cracks in the thread area, machine the thread area according to the depth of the damaged area to only remove the damaged structure and form a turning area. When removing the damaged thread and the fatigue crack layer or only removing the damaged thread, the removal amount is 1 mm downward from the lowest area after the thread is damaged.

[0039] When repairing the matrix area, before machining the area to be repaired on the drill pipe to remove the damaged structure and form a turning area, pre-repair inspection is required, specifically including:

[0040] Polish the matrix area of the drill pipe, measure the size of the damaged area, and determine the depth of the damaged area; and perform non-destructive testing using fluorescence or penetrant dyeing to determine whether there are cracks in the polished matrix area; if there are cracks in the matrix area, machine the matrix area to remove the damaged structure and the crack layer and form a turning area; if there are no cracks in the matrix area, machine the matrix area to only remove the damaged structure and form a turning area. When removing the damaged matrix and the crack layer or only removing the damaged matrix, the removal amount is 1 mm downward from the lowest area after the matrix is damaged.

[0041] After removing the damaged structure, it is necessary to ensure that the surface of the turning area is free of cracks. Therefore, it is necessary to clean the surface to be repaired in the turning area, wipe the surface with alcohol, and use fluorescence or penetrant inspection to detect whether there are obvious cracks to ensure that the surface to be repaired in the turning area is free of cracks. For local microscopic cracks, only grind and remove this area manually and then perform penetrant inspection again until there are no cracks. After the surface to be repaired in the turning area has no crack defects, measure the size of the base body to determine the repair thickness. After flaw detection is completed, use anhydrous alcohol to remove the oil stain on the surface layer.

[0042] Step 102: Repair the thread turning area by using a first repair material through a cladding process to form a first repair layer in the thread turning area;

[0043] The thread repair material in the thread area of the drill pipe needs to be close to the performance of the base material and have sufficient strength. Without heat treatment, it can ensure that the strength of the repair layer is close to that of the base material. After repair, the hardness of the repair layer is in the range of HB285-341, and defects such as repair cracking are avoided. After removing the damaged structure of the thread, the wall thickness of the base material is thin and the stiffness is poor. It is necessary to consider the heat input of the repair process to avoid deformation of the drill pipe during repair.

[0044] This method uses a first repair material to repair the thread area. The first repair material includes: carbon, silicon, manganese, phosphorus, sulfur, chromium, nickel, and molybdenum; the mass fraction of carbon is 0.06%-0.1%, the mass fraction of silicon is 0.1%-1.0%, the mass fraction of manganese is 0.1%-1.0%, the mass fraction of phosphorus is less than or equal to 0.04%, the mass fraction of sulfur is less than or equal to 0.04%, the mass fraction of chromium is 12%-18%, the mass fraction of nickel is 2.0%-6.0%, and the mass fraction of molybdenum is 0.1%-0.5%; the mass fraction of other components is less than or equal to 6%. This powder material has good compatibility with the base body, and after laser cladding or plasma cladding, its performance is close to that of the base material, and there are no cracks in the bonding layer and repair layer with the base material. During the repair process, control the heat input and the thickness of the repair layer to reduce the repair deformation.

[0045] The cladding process includes a laser cladding process and a plasma cladding process; the drill pipe includes a male thread and a female thread. The thread of the male thread is located on the outside, and the thread of the female thread is located on the inside; when the thread in the thread area is a male thread, use the first repair material and use the laser cladding process to repair the turning area to form a first repair layer for the male thread in the thread turning area;

[0046] When the thread in the thread area is a female thread, use the first repair material and use the plasma cladding process to repair the turning area; form a first repair layer for the female thread in the thread turning area.

[0047] Step 103: Perform threading on the first repair layer to complete the repair of the threaded area;

[0048] Specifically, after the repair is completed, the repair size of the first repair layer is detected, and non-destructive flaw detection is performed on the repaired threaded area using fluorescence or penetrant testing methods; then the excess amount of the first repair layer is removed by turning on a lathe to ensure the top dimensional tolerance before threading;

[0049] The surface of the first repair layer with the excess amount removed is detected using the penetrant method to obtain the detection result; the detection result indicates that there are no crack and porosity defects or there are crack and porosity defects on the surface of the first repair layer;

[0050] Threading is performed on the first repair layer with no crack and porosity defects according to the thread dimensions in the petroleum drill pipe drawing until the repaired thread dimensions and chamfers meet the requirements.

[0051] Surface penetrant testing is performed on the quality of the threaded area after threading to detect whether there are defects such as cracks and pores on the surface of the repaired part to ensure the repair quality. A portable hardness tester is used to detect the hardness of the repair layer, a thread ring gauge and a thread plug gauge are used to detect the thread dimensions, a digital display vernier caliper is used to detect the chamfer, and a portable hardness tester is used to detect the hardness of the joint. After passing the inspection, the repaired petroleum drill pipe is packaged and stored in the warehouse.

[0052] Step 104: Form a backing layer on the surface of the machined area of the substrate using a second repair material, and form a repair transition layer on the backing layer using a third repair material; the total thickness of the backing layer and the repair transition layer is the substrate repair thickness.

[0053] Taking the repair of the wear on the shoulders at both ends of the heavy drill pipe as an example, there is a wear-resistant band in the joint area of the heavy drill pipe. Before performing cladding repair on the joint dimensions, the wear-resistant band needs to be removed to expose the 4145H steel base material. The repair material needs to be compatible with the subsequent wear-resistant band composition and cannot affect the subsequent surfacing of the wear-resistant band and the performance of the wear-resistant band. The hardness requirement after joint welding is HB285 - 341. The wear-resistant band of the drill pipe is usually repaired using the wire surfacing repair process. Based on this, a combination of wire surfacing and laser repair is used to repair the heavy drill pipe substrate. The backing layer and the transition layer are welded by surfacing, and after the repair is completed, the second repair layer is machined to meet the repair dimensions. It is also possible to form the backing layer and the repair transition layer for substrate repair by laser cladding or plasma cladding using the second repair material powder and the third repair material powder.

[0054] Specifically, according to the drill pipe material and the subsequent requirements for surfacing wear-resistant bands, the second repair material includes: carbon, silicon, manganese, phosphorus, sulfur, chromium, and nickel; the mass fraction of carbon is 0.06% - 0.1%, the mass fraction of silicon is 0.1% - 75%, the mass fraction of manganese is 0.1% - 1.0%, the mass fraction of phosphorus is less than or equal to 0.04%, the mass fraction of sulfur is less than or equal to 0.03%, the mass fraction of chromium is 12% - 18%, the mass fraction of nickel is 0.1% - 1.5%, and the mass fraction of other components is less than or equal to 1%; the third repair material at least includes: carbon, silicon, manganese, phosphorus, sulfur, chromium, and nickel; the mass fraction of carbon is 0.06% - 0.15%, the mass fraction of silicon is 0.1% - 1.0%, the mass fraction of manganese is 0.1% - 1.0%, the mass fraction of phosphorus is less than or equal to 0.04%, the mass fraction of sulfur is less than or equal to 0.04%, the mass fraction of chromium is 10% - 15%, the mass fraction of nickel is 1.0% - 6.0%, and the mass fraction of other components is less than or equal to 1%. The selected second repair material and third repair material provide material compatibility for subsequent surfacing of wear-resistant bands while ensuring hardness.

[0055] As an optional method, after forming a repair transition layer with the third repair material on the backing layer, it further includes:

[0056] Using the first repair material, a cover layer is formed on the repair transition layer through a laser cladding process or a plasma cladding process; the cover layer is surface-treated by a laser quenching strengthening method; finally, a wear-resistant layer is formed on the cover layer through a laser cladding process to complete the repair of the matrix area. The added cover layer can ensure the hardness and wear resistance of the surface of the oil drill pipe matrix.

[0057] As an optional method, the laser cladding and plasma cladding processes are a non-steady-state variable temperature cycle process of metal heating, melting metallurgy, and solidification cooling. There is a certain stress accumulation during the repair, and the accumulated stress will cause deformation or even cracking. To avoid the deformation or scrapping of the oil drill pipe due to thermal stress during the repair, it is necessary to ensure that the surface is crack-free before the repair, avoid "welding with defects", and prevent the stress from causing the crack to extend and crack.

[0058] Before the oil drill pipe undergoes thread repair and matrix repair, the oil drill pipe is preheated, that is, the threaded turning area and the matrix turning area to be repaired are both areas after preheating treatment; the area after preheating treatment is the area where the oil drill pipe is preheated and the temperature is monitored; the purpose is to reduce the repair risk.

[0059] During the repair process, the temperatures in the thread turning area and the substrate turning area are both within the preset temperature range; specifically, during the temperature monitoring process, the temperature difference between the cladding layers needs to be controlled to reduce the risk of deformation and cracking during the forming process; the repaired oil drill pipe is subjected to slow cooling treatment. Under the condition of ensuring the mechanical properties and hardness requirements, a material with better toughness is selected for repair, the cladding process is adjusted, and on the premise of ensuring metallurgical fusion, the repair heat input is reduced and the stress is lowered.

[0060] See Figure 2 , specifically in implementation, first, dimensional inspection, non-destructive inspection, and hardness inspection are carried out on the worn area of the drill pipe. The worn area includes the thread area and the substrate area. Determine whether the worn area contains defects such as cracks and pores, and determine the turning depth according to the inspection results; then confirm the repair process for the worn area. If it is a male thread area, the laser cladding process is used. If it is a female thread area, the plasma cladding process is used. If it is a substrate repair, the laser cladding process or the plasma cladding process is used; remove the damaged structure and fatigue crack layer in the worn area, and conduct dimensional inspection and non-destructive inspection for the second time to ensure that there are no cracks on the surface after removal. Then repair the oil drill pipe. Use the first repair material to repair the thread area, use the second repair material and the third repair material to repair the substrate area, and perform machining on the repaired oil drill pipe to make the dimensions of the thread area and the substrate area consistent with those before the oil drill pipe was damaged. Conduct dimensional inspection, non-destructive inspection, and hardness inspection for the third time to ensure that the dimensions, hardness, and quality of the repaired oil drill pipe meet the requirements, and finally mark and store it in the warehouse.

[0061] This oil drill pipe repair method uses the first repair material to repair the thread turning area through the cladding process, forming a first repair layer in the thread turning area; perform thread machining on the first repair layer to complete the repair of the thread area; the first repair material powder has good compatibility with the substrate. After laser cladding or plasma cladding, its performance is close to that of the base material, and the strength of the repair layer can be guaranteed to be close to that of the base material without heat treatment. There are no cracks in the bonding layer and the repair layer with the base material, which can realize the repair of the oil drill pipe thread and ensure that the hardness of the oil drill pipe thread meets the requirements. Use the second repair material to form a primer layer on the surface of the substrate turning area, and use the third repair material to form a repair transition layer on the primer layer, which can ensure the hardness of the substrate repair layer while providing material compatibility for subsequent surfacing wear resistance, and at the same time can avoid defects such as repair cracking. This solution can realize the remanufacturing of the thread repair and substrate repair of the oil drill pipe, avoiding the waste caused by the existing oil drill pipe being truncated or scrapped after damage.

[0062] Embodiments of the present invention can divide functional modules according to the above method examples. For example, each functional module can be divided corresponding to each function, or two or more functions can be integrated into one processing module. The above integrated module can be implemented in the form of hardware or in the form of a software functional module. It should be noted that the division of modules in the embodiments of the present invention is illustrative, only a logical function division, and there can be other division methods in actual implementation.

[0063] In the case of dividing each functional module corresponding to each function, Figure 3 The structural schematic diagram of a petroleum drill pipe repair device provided by the present invention is shown. As Figure 3 shown, the device includes:

[0064] A machining module 301, configured to machine the area to be repaired of the petroleum drill pipe, remove the damaged structure, and form a turning area; the turning area includes a thread turning area and a matrix turning area; the area to be repaired includes at least a thread area and a matrix area; the damaged structure includes the damaged structure of the thread and the damaged structure of the matrix;

[0065] A thread repair module 302, configured to repair the thread turning area by a cladding process using a first repair material, and form a first repair layer in the thread turning area;

[0066] A thread machining module 303, configured to machine the thread of the first repair layer to complete the repair of the thread area;

[0067] A matrix repair module 304, configured to form a backing layer on the surface of the matrix turning area using a second repair material, and form a repair transition layer on the backing layer using a third repair material; the total thickness of the backing layer and the repair transition layer is the matrix repair thickness.

[0068] Optionally, there are no cracks on the surface of the turning area; the cladding process includes a laser cladding process and a plasma cladding process; the thread repair module 302 may include:

[0069] A male thread repair unit, configured to, when the thread in the thread area is a male thread, use a first repair material and a laser cladding process to repair the turning area, and form a male thread first repair layer in the thread turning area;

[0070] A female thread repair unit, configured to, when the thread in the thread area is a female thread, use a first repair material and a plasma cladding process to repair the turning area; and form a female thread first repair layer in the thread turning area.

[0071] Optionally, the device further includes a post-repair module for forming a cover layer on the repair transition layer by using a first repair material through a laser cladding process or a plasma cladding process;

[0072] A wear-resistant layer is formed on the cover layer by using a laser cladding process to complete the repair of the substrate area.

[0073] Optionally, the first repair material at least includes: carbon, silicon, manganese, phosphorus, sulfur, chromium, nickel, and molybdenum; the mass fraction of carbon is 0.06% - 0.1%, the mass fraction of silicon is 0.1% - 1.0%, the mass fraction of manganese is 0.1% - 1.0%, the mass fraction of phosphorus is less than or equal to 0.04%, the mass fraction of sulfur is less than or equal to 0.04%, the mass fraction of chromium is 12% - 18%, the mass fraction of nickel is 2.0% - 6.0%, and the mass fraction of molybdenum is 0.1% - 0.5%.

[0074] Optionally, the second repair material at least includes: carbon, silicon, manganese, phosphorus, sulfur, chromium, and nickel; the mass fraction of carbon is 0.06% - 0.1%, the mass fraction of silicon is 0.1% - 75%, the mass fraction of manganese is 0.1% - 1.0%, the mass fraction of phosphorus is less than or equal to 0.04%, the mass fraction of sulfur is less than or equal to 0.03%, the mass fraction of chromium is 12% - 18%, and the mass fraction of nickel is 0.1% - 1.5%; the third repair material at least includes: carbon, silicon, manganese, phosphorus, sulfur, chromium, and nickel; the mass fraction of carbon is 0.06% - 0.15%, the mass fraction of silicon is 0.1% - 1.0%, the mass fraction of manganese is 0.1% - 1.0%, the mass fraction of phosphorus is less than or equal to 0.04%, the mass fraction of sulfur is less than or equal to 0.04%, the mass fraction of chromium is 10% - 15%, and the mass fraction of nickel is 1.0% - 6.0%.

[0075] Optionally, the device further includes a pre-repair detection module, which may specifically include:

[0076] A polishing unit for polishing the area to be repaired of the drill pipe and determining the depth of the damaged area;

[0077] A non-destructive testing unit for performing non-destructive testing by using fluorescence or penetrant coloring to determine whether there are cracks in the area to be repaired;

[0078] A turning unit for, if there are cracks in the area to be repaired, machining the area to be repaired of the drill pipe according to the depth of the damaged area to remove the damaged structure and the crack layer to form a turning area;

[0079] If there are no cracks in the area to be repaired, machining the area to be repaired of the drill pipe according to the depth of the damaged area to remove the damaged structure and form a turning area.

[0080] Optionally, the thread machining module 303 may specifically include:

[0081] A lathe machining unit for removing the excess amount of the first repair layer by using a lathe to ensure the top dimensional tolerance before thread machining;

[0082] An inspection unit for inspecting the surface of the first repair layer with the excess amount removed by using the penetrant method to obtain an inspection result; the inspection result indicates that there are no crack and pore defects or there are crack and pore defects on the surface of the first repair layer;

[0083] A thread machining unit for machining the first repair layer with no crack and pore defects in the inspection result according to the thread size of the drill pipe until the repaired thread size and chamfer both meet the requirements.

[0084] Optionally, both the thread turning area and the substrate turning area to be repaired are preheated areas; the preheated area is an area where the drill pipe is preheated and the temperature is monitored; the temperatures of the thread turning area and the substrate turning area during the repair process are both within a preset temperature range; the repaired drill pipe is subjected to slow cooling treatment.

[0085] The above-mentioned drill pipe repair device is a virtual device, including virtual units and virtual function modules. This device is built on welding equipment and lathe equipment for use. At the same time, a drill pipe repair device provided by the present invention corresponds to a drill pipe repair method and acts on welding equipment and lathe equipment. The welding equipment can be laser cladding equipment, plasma cladding equipment, melting and gas shielded welding repair equipment, self-shielded flux cored wire surfacing repair equipment, etc.

[0086] In the case of adopting corresponding integrated units, Figure 4 shows Figure 4 a structural schematic diagram of a drill pipe repair device provided by the present invention. As Figure 4 shown, the device includes:

[0087] A communication unit / communication interface for obtaining the drill pipe to be repaired;

[0088] A processing unit / processor for machining the area to be repaired of the drill pipe to remove the damaged structure and form a turning area; the turning area includes a thread turning area and a substrate turning area; the area to be repaired includes at least a thread area and a substrate area; the damaged structure includes the damaged structure of the thread and the damaged structure of the substrate;

[0089] Repair the thread turning area by using a first repair material through a cladding process to form a first repair layer in the thread turning area;

[0090] Thread the first repair layer to complete the repair of the threaded area;

[0091] Form a backing layer on the surface of the turned area of the substrate with a second repair material, and form a repair transition layer on the backing layer with a third repair material; the total thickness of the backing layer and the repair transition layer is the substrate repair thickness.

[0092] The above-mentioned oil drill pipe repair equipment is used by being built on welding equipment and lathe equipment. At the same time, an oil drill pipe repair equipment provided by the present invention corresponds to an oil drill pipe repair method and acts on the welding equipment and the lathe equipment.

[0093] Although the present invention has been described in connection with various embodiments, however, in the process of implementing the claimed invention, those skilled in the art can understand and achieve other variations of the disclosed embodiments by viewing the drawings, the disclosure, and the appended claims. In the claims, the word "comprising" does not exclude other components or steps, and "a" or "one" does not exclude a plurality. A single processor or other unit can implement several functions recited in the claims. Certain measures are recited in mutually different dependent claims, but this does not mean that these measures cannot be combined to produce good results.

[0094] Although the present invention has been described in combination with specific features and their embodiments, it is obvious that various modifications and combinations can be made without departing from the spirit and scope of the present invention. Accordingly, the present specification and the drawings are merely exemplary illustrations of the present invention defined by the appended claims, and are considered to have covered any and all modifications, variations, combinations, or equivalents within the scope of the present invention. Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalent technologies, the present invention also intends to include these changes and modifications.

Claims

1. A method for repairing an oil drill pipe, characterized in that, Comprising: Machining the area to be repaired of the drill pipe to remove the damaged structure and form a turning area; the area to be repaired at least includes a thread area and a matrix area; the turning area includes a thread turning area and a matrix turning area; the damaged structure includes the damaged structure of the thread and the damaged structure of the matrix; Repairing the thread turning area by using a first repair material through a cladding process to form a first repair layer in the thread turning area; Performing thread machining on the first repair layer to complete the repair of the thread area; Forming a backing layer on the surface of the matrix turning area by using a second repair material, and forming a repair transition layer on the backing layer by using a third repair material; the total thickness of the backing layer and the repair transition layer is the matrix repair thickness.

2. The petroleum drill pipe repair method according to claim 1, characterized in that, There are no cracks on the surface of the turning area; the cladding process includes a laser cladding process and a plasma cladding process; the repairing the thread turning area by using a first repair material through a cladding process to form a first repair layer in the thread turning area includes: When the thread in the thread area is a male thread, using a first repair material and a laser cladding process to repair the turning area, and forming a male thread first repair layer in the thread turning area; When the thread in the thread area is a female thread, using a first repair material and a plasma cladding process to repair the turning area; and forming a female thread first repair layer in the thread turning area.

3. The method for repairing an oil drill pipe according to claim 1, wherein, After forming the repair transition layer on the backing layer by using the third repair material, it further includes: Using a first repair material to form a cover layer on the repair transition layer through a laser cladding process or a plasma cladding process; Using a laser cladding process to form a wear-resistant layer on the cover layer to complete the repair of the matrix area.

4. The method for repairing an oil drill pipe according to claim 1, characterized in that, The first repair material at least includes: carbon, silicon, manganese, phosphorus, sulfur, chromium, nickel and molybdenum; the mass fraction of carbon is 0.06% - 0.1%, the mass fraction of silicon is 0.1% - 1.0%, the mass fraction of manganese is 0.1% - 1.0%, the mass fraction of phosphorus is less than or equal to 0.04%, the mass fraction of sulfur is less than or equal to 0.04%, the mass fraction of chromium is 12% - 18%, the mass fraction of nickel is 2.0% - 6.0%, and the mass fraction of molybdenum is 0.1% - 0.5%.

5. The petroleum drill pipe repair method according to claim 1, characterized in that, The second repair material at least includes: carbon, silicon, manganese, phosphorus, sulfur, chromium and nickel; the mass fraction of carbon is 0.06% - 0.1%, the mass fraction of silicon is 0.1% - 75%, the mass fraction of manganese is 0.1% - 1.0%, the mass fraction of phosphorus is less than or equal to 0.04%, the mass fraction of sulfur is less than or equal to 0.03%, the mass fraction of chromium is 12% - 18%, and the mass fraction of nickel is 0.1% - 1.5%; the third repair material at least includes: carbon, silicon, manganese, phosphorus, sulfur, chromium and nickel; the mass fraction of carbon is 0.06% - 0.15%, the mass fraction of silicon is 0.1% - 1.0%, the mass fraction of manganese is 0.1% - 1.0%, the mass fraction of phosphorus is less than or equal to 0.04%, the mass fraction of sulfur is less than or equal to 0.04%, the mass fraction of chromium is 10% - 15%, and the mass fraction of nickel is 1.0% - 6.0%.

6. The method for repairing an oil drill pipe according to claim 1, wherein Before machining the area to be repaired of the oil drill pipe to remove the damaged structure and form a turning area, it also includes: Polishing the area to be repaired of the oil drill pipe and determining the depth of the damaged area; Performing non-destructive testing by fluorescence or dye penetrant method to determine whether there are cracks in the area to be repaired; If there are cracks in the area to be repaired, machining the area to be repaired of the oil drill pipe according to the depth of the damaged area to remove the damaged structure and the crack layer and form a turning area; If there are no cracks in the area to be repaired, machining the area to be repaired of the oil drill pipe according to the depth of the damaged area to remove the damaged structure and form a turning area.

7. The petroleum drill pipe repair method according to claim 1, wherein The thread machining of the first repair layer to complete the repair of the thread area includes: Using a lathe to remove the excess amount of the first repair layer to ensure the top size tolerance before thread machining; Using the penetrant method to detect the surface of the first repair layer with the excess amount removed to obtain a detection result; the detection result indicates that there are no crack and porosity defects or there are crack and porosity defects on the surface of the first repair layer; According to the thread size of the oil drill pipe, performing thread machining on the first repair layer with no crack and porosity defects in the detection result until the repaired thread size and chamfer both meet the requirements.

8. The method for repairing an oil drill pipe according to claim 1, wherein Both the thread turning area and the matrix turning area to be repaired are areas after preheating treatment; the area after preheating treatment is the area where the oil drill pipe is preheated and the temperature is monitored; during the repair process, the temperatures of the thread turning area and the matrix turning area are both within the preset temperature range; the repaired oil drill pipe is subjected to slow cooling treatment.

9. An oil drill pipe repair device, characterized in that, It includes: A machining module for machining the area to be repaired of the oil drill pipe to remove the damaged structure and form a turning area; the turning area includes a thread turning area and a matrix turning area; the area to be repaired at least includes a thread area and a matrix area; the damaged structure includes the damaged structure of the thread and the damaged structure of the matrix; A thread repair module for repairing the thread turning area by using a first repair material through a cladding process to form a first repair layer in the thread turning area; A thread machining module for performing thread machining on the first repair layer to complete the repair of the thread area; The substrate repair module is used to form a backing layer on the surface of the substrate turning area with a second repair material and form a repair transition layer on the backing layer with a third repair material; the total thickness of the backing layer and the repair transition layer is the substrate repair thickness.

10. An oil drill pipe repair device, characterized in that, It includes: A communication unit / communication interface, which is used to obtain the drill pipe to be repaired. A processing unit / processor, which is used to machine the area to be repaired of the drill pipe to remove the damaged structure and form a turning area; the turning area includes a thread turning area and a substrate turning area; the area to be repaired at least includes a thread area and a substrate area; the damaged structure includes the damaged structure of the thread and the damaged structure of the substrate. Use a first repair material to repair the thread turning area through a cladding process to form a first repair layer in the thread turning area. Perform thread machining on the first repair layer to complete the repair of the thread area. Use a second repair material to form a backing layer on the surface of the substrate turning area and use a third repair material to form a repair transition layer on the backing layer; the total thickness of the backing layer and the repair transition layer is the substrate repair thickness.

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