Surface treatment process of bypass valve ball basket

Abstract

The invention provides a surface treatment process for a bypass valve ball basket, and relates to the technical field of repeated opening and closing leakage stopping circulation tools. The surface treatment technology of the bypass valve ball basket comprises the following steps that the machined and formed bypass valve ball basket is subjected to surface pretreatment; the pretreated bypass valve ball basket is subjected to quenching treatment; the quenched bypass valve ball basket is subjected to surface polishing treatment; the polished bypass valve ball basket is subjected to liquid nitrogen quenching and tempering treatment; and the bypass valve ball basket subjected to tempering treatment is subjected to surface phosphating treatment. After the ball basket is machined and formed, the hardness, the abrasion resistance and the erosion resistance of the metal surface can be remarkably improved through salt bath quenching, liquid nitrogen quenching and tempering surface treatment, meanwhile, workpiece distortion is small, finally, ball basket phosphorization is conducted, the rust-proof and corrosion-proof capacity of the ball basket is further improved, and the service life of the ball basket is prolonged. And the defect that the service life of the untreated basket is short is overcome. And the method has the advantages of simple process steps, economy, environmental protection and convenience in operation.

Description

Technical Field

[0001] The present application relates to the technical field of multiple-opening and closing leak plugging cycle tools, and in particular to a surface treatment process for a bypass valve ball basket. Background Art

[0002] The multiple activation bypass valve is a set of short sections that can be opened and closed multiple times. It is widely used in the oil drilling industry. It is generally installed in special drilling tool assemblies such as directional, speed-up and logging while drilling. It can be opened and closed in time according to the downhole working conditions for special operations, enhancing the applicability of special drilling tool assemblies, which is conducive to improving production efficiency and reducing well control risks. The multiple activation bypass valve can protect the downhole drilling tool assembly during plugging while drilling, acid injection, well repair and completion operations, assist in improving cutting efficiency during reaming operations, increase annular flow velocity in horizontal wells and directional wells, enhance the cleaning capacity of the lower side of the well wall, and can plug leaks with high-concentration large-particle materials multiple times without drilling when a well leakage accident occurs, effectively reducing on-site well control risks.

[0003] In my country, multiple activation bypass valves are widely used. However, the service life of the ball basket used to collect the switch balls in the multiple switch plugging cycle tools is generally short, and it is very easy to rust, wear and become scrapped. Summary of the invention

[0004] The purpose of the present application is to provide a surface treatment process for a bypass valve ball basket, which can significantly improve the hardness, wear resistance, erosion resistance and rust corrosion resistance of the metal surface of the bypass valve ball basket.

[0005] In order to solve the above technical problems, the technical solution adopted in this application is:

[0006] The present application provides a surface treatment process for a bypass valve ball basket, comprising the following steps:

[0007] S1. Pre-treating the surface of the bypass valve ball basket after processing;

[0008] S2, subjecting the pretreated bypass valve ball basket to quenching treatment;

[0009] S3, polishing the surface of the bypass valve ball basket after quenching;

[0010] S4, subjecting the polished bypass valve ball basket to liquid nitrogen quenching and tempering treatment;

[0011] S5. Perform phosphating treatment on the surface of the bypass valve ball basket after tempering treatment.

[0012] Compared with the prior art, the embodiments of the present application have at least the following advantages or beneficial effects:

[0013] The ball basket of the multiple-open-close plugging cycle tool works for a long time underground, and the wear and corrosion of the liquid on the ball basket are particularly strong. After the ball basket is machined, the present application can significantly improve the hardness, wear resistance and erosion resistance of the metal surface through salt bath quenching, liquid nitrogen quenching and tempering surface treatment, while reducing the distortion of the workpiece; finally, the ball basket is phosphated to further enhance the anti-rust and anti-corrosion ability of the ball basket, making up for the disadvantage of the short service life of the ball basket without treatment. In addition, the process steps of the present application are simple, and it has the advantages of economy, environmental protection and convenient operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0015] Figure 1 This is a product picture of the bypass valve ball basket prepared in Experimental Example 1 of this application after use. DETAILED DESCRIPTION

[0016] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application will be described clearly and completely below. If the specific conditions are not specified in the embodiments, they are carried out according to the conventional conditions or the conditions recommended by the manufacturer. If the manufacturer is not specified for the reagents or instruments used, they are all conventional products that can be purchased commercially.

[0017] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to specific embodiments.

[0018] A surface treatment process for a bypass valve ball basket comprises the following steps:

[0019] S1. Pre-treat the surface of the bypass valve ball basket after processing to remove dust and impurities on the surface to ensure the surface is clean;

[0020] S2, quenching the pretreated bypass valve ball basket;

[0021] S3, performing surface polishing treatment on the quenched bypass valve ball basket to remove oxides and rough layers on the surface of the bypass valve ball basket;

[0022] S4. The polished bypass valve ball basket is subjected to liquid nitrogen quenching and tempering treatment to reduce residual stress, increase toughness and stabilize material structure;

[0023] S5. Perform phosphating treatment on the surface of the bypass valve ball basket after tempering treatment.

[0024] In some embodiments of the present application, the surface pretreatment of S1 is specifically to clean the ball basket of the bypass valve with clean water.

[0025] In some embodiments of the present application, the quenching in the above step S2 adopts salt bath quenching, the quenching temperature is 500-600° C., and the holding time is 60-120 min.

[0026] In some embodiments of the present application, the temperature of liquid nitrogen quenching in the above step S4 is -175 to -196°C, and the time of liquid nitrogen quenching is 50 to 90 minutes.

[0027] In some embodiments of the present application, the tempering temperature is 200-240° C., and the tempering time is 50-100 min.

[0028] In some embodiments of the present application, in the above-mentioned step S5, the bypass valve ball basket after tempering is first air-cooled, and then surface phosphating is performed.

[0029] In some embodiments of the present application, the surface phosphating treatment in the above-mentioned step S5 is specifically as follows: immerse the bypass valve ball basket in a phosphating solution, phosphate at 80-90°C for 3-6 minutes, then take it out, rinse it with clean water, rinse it with hot water, and dry it.

[0030] In some embodiments of the present application, the phosphating solution is composed of 40-60 g / L phosphoric acid, 80-100 g / L zinc oxide, 30-40 g / L dihydrogen phosphate, 10-15 g / L citric acid, 3-8 g / L titanate and 5-8 g / L sodium fluoroborate.

[0031] In some embodiments of the present application, the time for rinsing with clean water is 2 to 4 minutes; the temperature for rinsing with hot water is 50 to 60°C, and the rinsing time is 1 to 3 minutes; and the drying temperature is 50 to 70°C.

[0032] The features and performance of the present application are further described in detail below in conjunction with the embodiments.

[0033] Example 1

[0034] A surface treatment process for a bypass valve ball basket comprises the following steps:

[0035] S1. Clean the surface of the bypass valve ball basket after processing to remove dust and impurities on the surface to ensure that the surface is clean;

[0036] S2. Send the pretreated bypass valve ball basket into a salt bath furnace for salt bath quenching. The salt bath temperature is 580°C and the temperature is kept for 60 minutes.

[0037] S3, performing surface polishing treatment on the quenched bypass valve ball basket to remove oxides and rough layers on the surface of the bypass valve ball basket;

[0038] S4. Immerse the polished bypass valve ball basket in liquid nitrogen, quench it at -196°C for 80 minutes, and then temper it at 220°C for 80 minutes to reduce residual stress, increase toughness and stabilize the material structure;

[0039] S5. Air-cool the bypass valve ball basket after tempering, then immerse it in phosphating solution, phosphate it at 90°C for 4 minutes, then take it out and rinse it with clean water for 3 minutes, rinse it with hot water at 55°C for 3 minutes, and finally dry it at 60°C. The phosphating solution of this embodiment is composed of 55g / L phosphoric acid, 90g / L zinc oxide, 35g / L dihydrogen phosphate, 12g / L citric acid, 5g / L titanate and 6g / L sodium fluoroborate. The product after treatment in this embodiment is as follows Figure 1 shown.

[0040] Example 2

[0041] A surface treatment process for a bypass valve ball basket comprises the following steps:

[0042] S1. Wash the surface of the bypass valve ball basket after processing with clean water to remove dust and impurities on the surface to ensure that the surface is clean;

[0043] S2. Send the pretreated bypass valve ball basket into a salt bath furnace for salt bath quenching. The salt bath temperature is 600°C and the temperature is kept for 80 minutes.

[0044] S3, performing surface polishing treatment on the quenched bypass valve ball basket to remove oxides and rough layers on the surface of the bypass valve ball basket;

[0045] S4. Immerse the polished bypass valve ball basket in liquid nitrogen, quench it at -180°C for 90 minutes, and then temper it at 220°C for 100 minutes to reduce residual stress, increase toughness and stabilize the material structure;

[0046] S5. The bypass valve ball basket after tempering is air-cooled, then immersed in a phosphating solution, phosphated at 85°C for 5 minutes, then taken out and rinsed with clean water for 3 minutes, rinsed with hot water at 52°C for 3 minutes, and finally dried at 55°C. The phosphating solution of this embodiment is composed of 60g / L phosphoric acid, 85g / L zinc oxide, 38g / L dihydrogen phosphate, 15g / L citric acid, 4g / L titanate, and 5g / L sodium fluoroborate.

[0047] Example 3

[0048] A surface treatment process for a bypass valve ball basket comprises the following steps:

[0049] S1. Wash the surface of the bypass valve ball basket after processing with clean water to remove dust and impurities on the surface to ensure that the surface is clean;

[0050] S2. Send the pretreated bypass valve ball basket into a salt bath furnace for salt bath quenching. The salt bath temperature is 520°C and the temperature is kept for 100 minutes.

[0051] S3, performing surface polishing treatment on the quenched bypass valve ball basket to remove oxides and rough layers on the surface of the bypass valve ball basket;

[0052] S4. Immerse the polished bypass valve ball basket in liquid nitrogen, quench it at -180°C for 80 minutes, and then temper it at 240°C for 100 minutes to reduce residual stress, increase toughness and stabilize material structure;

[0053] S5. The bypass valve ball basket after tempering is air-cooled, then immersed in a phosphating solution, phosphated at 90° C. for 5 minutes, then taken out and rinsed with clean water for 2 minutes, rinsed with hot water at 60° C. for 3 minutes, and finally dried at 55° C. The phosphating solution of this embodiment is composed of 55 g / L phosphoric acid, 80 g / L zinc oxide, 38 g / L dihydrogen phosphate, 12 g / L citric acid, 4 g / L titanate, and 6 g / L sodium fluoroborate.

[0054] Example 4

[0055] A surface treatment process for a bypass valve ball basket comprises the following steps:

[0056] S1. Wash the surface of the bypass valve ball basket after processing with clean water to remove dust and impurities on the surface to ensure that the surface is clean;

[0057] S2. Send the pretreated bypass valve ball basket into a salt bath furnace for salt bath quenching. The salt bath temperature is 560°C and the temperature is kept for 70 minutes.

[0058] S3, performing surface polishing treatment on the quenched bypass valve ball basket to remove oxides and rough layers on the surface of the bypass valve ball basket;

[0059] S4. Immerse the polished bypass valve ball basket in liquid nitrogen, quench it at -196°C for 90 minutes, and then temper it at 240°C for 60 minutes to reduce residual stress, increase toughness and stabilize material structure;

[0060] S5. The bypass valve ball basket after tempering is air-cooled, then immersed in a phosphating solution, phosphated at 90°C for 6 minutes, then taken out and rinsed with clean water for 2 minutes, rinsed with hot water at 60°C for 3 minutes, and finally dried at 55°C. The phosphating solution of this embodiment is composed of 55g / L phosphoric acid, 80g / L zinc oxide, 40g / L dihydrogen phosphate, 10g / L citric acid, 5g / L titanate and 6g / L sodium fluoroborate.

[0061] Example 5

[0062] A surface treatment process for a bypass valve ball basket comprises the following steps:

[0063] S1. Wash the surface of the bypass valve ball basket after processing with clean water to remove dust and impurities on the surface to ensure that the surface is clean;

[0064] S2. Send the pretreated bypass valve ball basket into a salt bath furnace for salt bath quenching. The salt bath temperature is 580°C and the temperature is kept for 80 minutes.

[0065] S3, performing surface polishing treatment on the quenched bypass valve ball basket to remove oxides and rough layers on the surface of the bypass valve ball basket;

[0066] S4. Immerse the polished bypass valve ball basket in liquid nitrogen, quench it at -196°C for 80 minutes, and then temper it at 240°C for 60 minutes to reduce residual stress, increase toughness and stabilize the material structure;

[0067] S5. Air-cool the bypass valve ball basket after tempering, then immerse it in a phosphating solution, phosphate it at 90°C for 5 minutes, then take it out and rinse it with clean water for 2 minutes, rinse it with hot water at 60°C for 3 minutes, and finally dry it at 55°C. The phosphating solution of this embodiment is composed of 55g / L phosphoric acid, 80g / L zinc oxide, 40g / L dihydrogen phosphate, 10g / L citric acid, 5g / L titanate and 6g / L sodium fluoroborate.

[0068] Example 6

[0069] A surface treatment process for a bypass valve ball basket comprises the following steps:

[0070] S1. Wash the surface of the bypass valve ball basket after processing with clean water to remove dust and impurities on the surface to ensure that the surface is clean;

[0071] S2. Send the pretreated bypass valve ball basket into a salt bath furnace for salt bath quenching. The salt bath temperature is 590°C and the temperature is kept for 85 minutes.

[0072] S3, performing surface polishing treatment on the quenched bypass valve ball basket to remove oxides and rough layers on the surface of the bypass valve ball basket;

[0073] S4. Immerse the polished bypass valve ball basket in liquid nitrogen, quench it at -196°C for 80 minutes, and then temper it at 220°C for 60 minutes to reduce residual stress, increase toughness and stabilize the material structure;

[0074] S5. The bypass valve ball basket after tempering is air-cooled, then immersed in a phosphating solution, phosphated at 90° C. for 5 minutes, then taken out and rinsed with clean water for 2 minutes, rinsed with hot water at 60° C. for 3 minutes, and finally dried at 55° C. The phosphating solution of this embodiment is composed of 60 g / L phosphoric acid, 80 g / L zinc oxide, 40 g / L dihydrogen phosphate, 12 g / L citric acid, 5 g / L titanate, and 5 g / L sodium fluoroborate.

[0075] The surface of the bypass valve ball basket after the treatment process of the embodiment of the present application is smooth and flat, and the film thickness is 2-4μm; the salt spray test can reach more than 320 hours (the salt spray resistance time of the untreated bypass valve ball basket is 260-280h), the alkali resistance is more than 70 hours (the alkali resistance of the untreated bypass valve ball basket is 50-60h), the wear resistance is improved by 2.5-3 times, and the erosion resistance is increased by 1.5-1.75 times.

[0076] In summary, the surface treatment process of a bypass valve ball basket of the embodiment of the present application has the following advantages: after the ball basket is machined, the present application can significantly improve the hardness, wear resistance and erosion resistance of the metal surface through salt bath quenching, liquid nitrogen quenching and tempering surface treatment, while having small workpiece distortion, and finally phosphating the ball basket to further enhance the anti-rust and anti-corrosion ability of the ball basket, making up for the disadvantage of the short service life of the ball basket without treatment. In addition, the process steps of the present application are simple, and it has the advantages of being economical, environmentally friendly and easy to operate.

[0077] The embodiments described above are part of the embodiments of the present application, rather than all of the embodiments. The detailed description of the embodiments of the present application is not intended to limit the scope of the present application for protection, but merely represents the selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work belong to the scope of protection of the present application.

Claims

1. A surface treatment process for a bypass valve ball basket, characterized in that: The following steps are involved: S1. Pre-treating the surface of the bypass valve ball basket after processing; S2, quenching the pretreated bypass valve ball basket; S3, polishing the surface of the bypass valve ball basket after quenching; S4, subjecting the polished bypass valve ball basket to liquid nitrogen quenching and tempering treatment; S5. Perform phosphating treatment on the surface of the bypass valve ball basket after tempering treatment.

2. The surface treatment process of the bypass valve ball basket according to claim 1 is characterized in that: The surface pretreatment of S1 is specifically to clean the ball basket of the bypass valve with clean water.

3. The surface treatment process of a bypass valve ball basket according to claim 1 is characterized in that: The quenching in the step S2 is performed by salt bath quenching, the quenching temperature is 500-600° C., and the holding time is 60-120 min.

4. The surface treatment process of a bypass valve ball basket according to claim 1 is characterized in that: The temperature of liquid nitrogen quenching in step S4 is -175 to -196°C, and the time of liquid nitrogen quenching is 50 to 90 minutes.

5. The surface treatment process of the bypass valve ball basket according to claim 4 is characterized in that: The tempering temperature is 200-240° C., and the tempering time is 50-100 minutes.

6. The surface treatment process of a bypass valve ball basket according to claim 1 is characterized in that: In the step S5, the bypass valve ball basket after the tempering treatment is first air-cooled, and then the surface is phosphated.

7. The surface treatment process of the bypass valve ball basket according to claim 6 is characterized in that: The surface phosphating treatment in step S5 is specifically as follows: immersing the bypass valve ball basket in a phosphating treatment solution, phosphating at 80-90° C. for 3-6 minutes, then taking it out, rinsing it with clean water, washing it with hot water, and drying it.

8. The surface treatment process of the bypass valve ball basket according to claim 7 is characterized in that: The phosphating solution consists of 40-60 g / L phosphoric acid, 80-100 g / L zinc oxide, 30-40 g / L dihydrogen phosphate, 10-15 g / L citric acid, 3-8 g / L titanate and 5-8 g / L sodium fluoroborate.

9. The surface treatment process of the bypass valve ball basket according to claim 7 is characterized in that: The clean water rinsing time is 2 to 4 minutes; the hot water rinsing temperature is 50 to 60° C., and the rinsing time is 1 to 3 minutes; the drying temperature is 50 to 70° C.

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