Method for welding polycrystalline diamond compact on non-magnetic stabilizer

Abstract

The invention discloses a method for welding a polycrystalline diamond compact on a non-magnetic stabilizer, which comprises the following steps of: S1, cladding nickel-based or chromium-based metal powder on the surface of a non-magnetic stabilizer body through laser equipment to form a transition layer; s2, welding the polycrystalline diamond compact on the transition layer through a silver-based or copper-based brazing material; and S3, after welding is completed, the welded non-magnetic stabilizer enters heat preservation equipment, the equipment temperature ranges from 290 DEG C to 310 DEG C, heat preservation is conducted for 170-190 min, and then air cooling is conducted to the room temperature. Nickel-based or chromium-based metal powder is cladded between a non-magnetic stabilizer body and a polycrystalline diamond compact by laser equipment to form a transition layer, so that guarantee is provided for the adhesion of subsequent welding; and heat preservation equipment is used for heating materials needing laser cladding and welding in advance to the proper time, energy input needed in the laser cladding and welding process is reduced, and the non-magnetic stabilizer is prevented from being magnetized in the welding process.

Description

Technical Field

[0001] The invention relates to the technical field of welding, and in particular to a method for welding a polycrystalline diamond composite sheet on a non-magnetic stabilizer. Background Art

[0002] In oil and gas drilling operations, due to the gap between the drill string and the drill bit in the wellbore, there is inevitably lateral deviation between them. In severe cases, the drill string will bend under pressure. The main harm is that it causes damage to the drill bit and well deviation. In order to avoid this situation, stabilizers are commonly used in drilling operations to stabilize the wellbore trajectory and prevent deviation, thereby effectively stabilizing the drilling tools, increasing the life of the drill bit, and improving the drilling speed and wellbore quality.

[0003] With the continuous development of drilling technology, the application of rotary steering and vertical steering tools in drilling, high-precision logging has become a guarantee of intelligence and automation. The commonly used measuring instruments currently sense the earth's magnetic field when measuring the direction of the wellbore. Therefore, the measuring instruments must work in a non-magnetic environment. This requires that the stabilizer used in conjunction must have non-magnetic characteristics to meet the needs of real-time logging of various steering tools. However, the commonly used stabilizer materials and surface hardening layers are made of magnetic materials and cannot meet the actual use needs.

[0004] Therefore, a non-magnetic stabilizer is urgently needed in the drilling process. However, there are two problems in the production of non-magnetic stabilizers: 1. The welding temperature of non-magnetic materials cannot exceed 500℃. After exceeding this temperature, non-magnetic materials will regain magnetism. This temperature limitation makes it impossible for most welding processes to complete the melting connection between non-magnetic materials and high-hardness materials attached to the stabilizer surface.

[0005] 2. Most of the high-hardness materials on the stabilizer surface are made of cemented carbide materials, which are magnetic and cannot meet the non-magnetic requirements. Summary of the invention

[0006] In order to solve the above problems, the present invention provides a method for welding a polycrystalline diamond composite sheet on a non-magnetic stabilizer, which ensures that the non-magnetic stabilizer body will not be magnetized during the welding process and realizes the fusion connection between the non-magnetic stabilizer body and the polycrystalline diamond composite sheet.

[0007] In order to achieve the above object, the present invention adopts the following technical solution: A method for welding a polycrystalline diamond composite sheet on a non-magnetic stabilizer comprises the following steps: S1. Nickel-based or chromium-based metal powder is clad on the surface of the non-magnetic stabilizer body by laser equipment to form a transition layer; S2, welding the polycrystalline diamond composite sheet to the transition layer by using a silver-based or copper-based brazing material; S3. After welding is completed, the welded non-magnetic stabilizer is placed in a heat preservation device at a temperature of 290°C to 310°C. After heat preservation for 170 to 190 minutes, it is air-cooled to room temperature.

[0008] The step S1 is specifically as follows: S11, placing the non-magnetic stabilizer body and nickel-based or chromium-based metal powder into a heat preservation device, with a heating temperature of 140°C to 160°C and a heat preservation time of 170 to 190 minutes; S12, stacking nickel-based or chromium-based metal powder on the surface of the spiral ribbed band of the non-magnetic stabilizer body; S13. Use a high-energy-density laser beam generated by a laser device to quickly melt nickel-based or chromium-based metal powder, forming a molten pool on the surface of the spiral ribs of the non-magnetic stabilizer body and combining it with the non-magnetic stabilizer body.

[0009] Wherein, in step S11, the heating temperature is 145° C. to 155° C., and the insulation time is 175 to 185 minutes.

[0010] The step S2 is specifically as follows: S21, placing the laser-processed non-magnetic stabilizer body and the polycrystalline diamond composite sheet into a heat preservation device, with the heating temperature being 240° C. to 260° C. and the heat preservation time being 170 to 190 minutes; S22. Use silver-based or copper-based brazing materials to weld the polycrystalline diamond composite sheet to the transition layer, and use temperature control and detection equipment to detect the welding temperature in real time to ensure that the welding temperature is controlled between 300°C and 400°C.

[0011] Wherein, in step S21, the heating temperature is 245° C. to 255° C., and the insulation time is 175 to 185 minutes.

[0012] Wherein, in step S3, the equipment temperature is 295°C to 305°C, and after being kept warm for 175 to 185 minutes, it is air-cooled to room temperature.

[0013] The beneficial effects of the present invention are as follows: between the non-magnetic stabilizer body and the polycrystalline diamond composite sheet, nickel-based or chromium-based metal powder is first clad by laser equipment to form a transition layer, which provides a guarantee for the adhesion of subsequent welding; and the material that needs laser cladding and welding is heated to a suitable time in advance by heat preservation equipment, which reduces the energy input required in the laser cladding and welding process, and limits the welding temperature, ensuring that the non-magnetic stabilizer body does not exceed 500°C during the welding process, thereby preventing the non-magnetic stabilizer from generating magnetism.

[0014] The non-magnetic stabilizer prepared by the method uses a transition layer formed by nickel-based or chromium-based metal powder to avoid the problem of magnetization of the non-magnetic stabilizer and polycrystalline diamond composite sheet during direct high-temperature welding, and the problem of weak welding at low temperature. The non-magnetic processing is ensured by using nickel-based or chromium-based metal powder instead of magnetic materials such as tungsten carbide, and the nickel-based or chromium-based metal as a bonding phase can ensure the firmness of welding; the non-magnetic stabilizer prepared by the method has a relative magnetic permeability of 1.0019 to 1.0028, which is almost unchanged from before welding, ensuring the non-magnetic characteristics of the body. The relative magnetic permeability of the surface polycrystalline diamond composite sheet welding layer is 1.0032 to 1.0056, meeting the requirement of relative magnetic permeability <1.010; the non-magnetic stabilizer prepared by the method provides a non-magnetic environment for the measuring instrument, avoids magnetic interference, and ensures that the data measured by the measuring instrument are true and reliable. Improve the accuracy and efficiency of drilling. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The present invention will be further described below in conjunction with the accompanying drawings: Figure 1 This is a schematic diagram of the non-magnetic stabilizer after welding of the present invention; 1. Non-magnetic stabilizer body; 2. Polycrystalline diamond composite sheet. DETAILED DESCRIPTION

[0016] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0017] The technical solution of the present invention is described in detail with specific embodiments below. The following specific embodiments can be combined or replaced with each other according to actual conditions, and the same or similar concepts or processes may not be described in detail in some embodiments. Example

[0018] like Figure 1 As shown, the present invention provides a method for welding a polycrystalline diamond compact on a non-magnetic stabilizer, comprising the following steps: S1, nickel-based or chromium-based metal powder is clad on the surface of the non-magnetic stabilizer body 1 by laser equipment to form a transition layer; S2, welding the polycrystalline diamond composite sheet 2 to the transition layer by using a silver-based or copper-based brazing material; S3. After welding is completed, the welded non-magnetic stabilizer 1 is placed in a heat preservation device at a temperature of 290°C to 310°C. After heat preservation for 170 to 190 minutes, it is air-cooled to room temperature.

[0019] The step S1 is specifically as follows: S11, placing the non-magnetic stabilizer body 1 and nickel-based or chromium-based metal powder into a heat preservation device, heating the device to a temperature of 140° C. to 160° C. for a heat preservation time of 170 to 190 minutes; S12, stacking nickel-based or chromium-based metal powder on the surface of the spiral ribs of the non-magnetic stabilizer body 1; S13. Use a high-energy-density laser beam generated by a laser device to quickly melt nickel-based or chromium-based metal powder, forming a molten pool on the surface of the spiral ribs of the non-magnetic stabilizer body 1 and combining it with the non-magnetic stabilizer body 1.

[0020] The step S2 is specifically as follows: S21, putting the laser-processed non-magnetic stabilizer body 1 and the polycrystalline diamond composite sheet 2 into a heat preservation device, heating the device to a temperature of 240° C. to 260° C. for a heat preservation time of 170 to 190 minutes; S22. The polycrystalline diamond composite sheet 2 is welded to the transition layer using a silver-based or copper-based brazing material, and the welding temperature is detected in real time using a temperature control detection device to ensure that the welding temperature is controlled between 300° C. and 400° C.

[0021] The present invention first uses laser equipment to melt nickel-based or chromium-based metal powder between the non-magnetic stabilizer body 1 and the polycrystalline diamond composite sheet 2 to form a transition layer, thereby providing a guarantee for the adhesion of subsequent welding; at the same time, the material that needs laser melting and welding is heated to a suitable time in advance by a heat preservation device, thereby effectively reducing the energy input required in the welding process, preventing the situation of overheating caused by welding for too long in the welding process, and causing the non-magnetic stabilizer body 1 to be magnetized due to high temperature; and the advance heating ensures that the temperature of the welding material is uniform, which helps to reduce the thermal stress in the welding process, thereby reducing the risk of defects such as welding deformation and cracks, and improving the welding quality; further, the welding temperature is detected in real time by a temperature control detection device during the welding process, thereby further ensuring that the welding temperature is within the allowable range. Example

[0022] Different from Example 1, in step S11, the heating temperature is 145°C to 155°C, and the insulation time is 175 to 185 minutes; in step S21, the heating temperature is 245°C to 255°C, and the insulation time is 175 to 185 minutes; in step S3, the equipment temperature is 295°C to 305°C, and after insulation for 175 to 185 minutes, it is air-cooled to room temperature.

[0023] The non-magnetic stabilizer prepared by this method uses a transition layer formed by nickel-based or chromium-based metal powder to avoid the problem of magnetization of the non-magnetic stabilizer and polycrystalline diamond composite sheet during direct high-temperature welding, and the problem of weak welding at low temperature. The non-magnetic processing is ensured by using nickel-based or chromium-based metal powder instead of magnetic materials such as tungsten carbide, and the nickel-based or chromium-based metal as a bonding phase can ensure the firmness of welding; the relative magnetic permeability of the non-magnetic stabilizer body is 1.0019-1.0028, which is almost unchanged from before welding, ensuring the non-magnetic characteristics of the body. The relative magnetic permeability of the surface polycrystalline diamond composite sheet welding layer is 1.0032-1.0056, which meets the requirement of relative magnetic permeability <1.010; the non-magnetic stabilizer prepared by this method provides a non-magnetic environment for the measuring instrument, avoids magnetic interference, and ensures that the data measured by the measuring instrument are true and reliable. Improve the accuracy and efficiency of drilling.

[0024] In addition to the above-mentioned preferred embodiments, the present invention also has other implementation modes. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative work are within the scope of protection requested by the present invention.

Claims

1. A method for welding a polycrystalline diamond compact on a non-magnetic stabilizer, characterized in that: The steps include: S1, nickel-based or chromium-based metal powder is clad on the surface of the non-magnetic stabilizer body (1) by laser equipment to form a transition layer; S2, welding the polycrystalline diamond composite sheet (2) to the transition layer by means of a silver-based or copper-based brazing material; S3. After welding is completed, the welded non-magnetic stabilizer (1) is placed in a heat preservation device at a temperature of 290°C to 310°C. After heat preservation for 170 to 190 minutes, it is air-cooled to room temperature.

2. A method for welding a polycrystalline diamond compact on a non-magnetic stabilizer according to claim 1, characterized in that: The step S1 is specifically as follows: S11, placing the non-magnetic stabilizer body (1) and the nickel-based or chromium-based metal powder into a heat preservation device, heating the device to a temperature of 140° C. to 160° C. for a heat preservation time of 170 to 190 minutes; S12, stacking nickel-based or chromium-based metal powder on the surface of the spiral rib band of the non-magnetic stabilizer body (1); S13. Using a high energy density laser beam generated by a laser device to quickly melt nickel-based or chromium-based metal powder, a molten pool is formed on the surface of the spiral ribs of the non-magnetic stabilizer body (1), and the molten pool is combined with the non-magnetic stabilizer body (1).

3. A method for welding a polycrystalline diamond compact on a non-magnetic stabilizer according to claim 2, characterized in that: In the step S11, the heating temperature is 145° C. to 155° C., and the insulation time is 175 to 185 minutes.

4. A method for welding a polycrystalline diamond compact on a non-magnetic stabilizer according to claim 1, characterized in that: The step S2 is specifically as follows: S21, placing the laser-processed non-magnetic stabilizer body (1) and the polycrystalline diamond composite sheet (2) into a heat preservation device, heating the device to a temperature of 240° C. to 260° C. for a heat preservation time of 170 to 190 minutes; S22. The polycrystalline diamond composite sheet (2) is welded to the transition layer using a silver-based or copper-based brazing material, and the welding temperature is detected in real time using a temperature control detection device to ensure that the welding temperature is controlled between 300° C. and 400° C.

5. A method for welding a polycrystalline diamond compact on a non-magnetic stabilizer according to claim 4, characterized in that: In step S21, the heating temperature is 245° C. to 255° C., and the insulation time is 175 to 185 minutes.

6. The method for welding a polycrystalline diamond compact on a non-magnetic stabilizer according to claim 1, characterized in that: In step S3, the equipment temperature is 295° C. to 305° C., and is kept warm for 175 to 185 minutes before being air-cooled to room temperature.

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