Preparation method of titanium alloy petroleum drilling mud tank

Abstract

The invention relates to the technical field of alloy material preparation, in particular to a titanium alloy petroleum drilling mud tank preparation method which comprises the steps that aluminum, vanadium, tin, copper, iron, zirconium and sponge titanium are cleaned and air-dried according to the raw material ratio; performing alloy smelting treatment for multiple times to obtain an alloy ingot; annealing heat treatment is conducted on the alloy ingot, and temperature fields and deformation fields of the surface of the alloy ingot at all moments are obtained; the temperature fluctuation degree at the current moment is determined; obtaining a temperature regulation and control flag bit at the current moment and a deformation consistency coefficient at the current moment; correcting the target temperature value at the current moment in combination with a preset temperature regulation step length to obtain a regulated temperature value at the current moment; and after annealing treatment, the alloy ingot is subjected to solution treatment, a titanium alloy ingot is obtained, and the titanium alloy petroleum drilling mud tank is obtained through cutting, forging, rolling and welding. The mechanical property and corrosion resistance of the titanium alloy petroleum drilling mud tank are improved.

Description

Technical Field

[0001] This application relates to the field of alloy material preparation technology, specifically to a method for preparing a titanium alloy oil drilling mud tank. Background Technology

[0002] An oil drilling mud tank is a device used to store, process, and manage drilling mud during oil drilling operations. Mud plays a crucial role in oil and gas drilling operations, not only cooling and lubricating the drill bit but also removing cuttings generated during drilling and maintaining borehole stability. The main function of the mud tank is to store and supply mud, while supporting the mud circulation system to ensure that mud can be reused repeatedly during drilling, reducing resource waste and being essential for improving the safety and efficiency of drilling operations.

[0003] Titanium alloys possess excellent corrosion resistance, especially in complex drilling environments, where they effectively resist corrosion from various chemicals in drilling mud. Traditional steel, when in prolonged contact with drilling mud, particularly in environments containing corrosive components such as sulfides and chlorides, is prone to corrosion, leading to equipment damage and increased maintenance costs. Titanium alloys, due to their superior corrosion resistance, can significantly extend the service life of mud tanks, reducing repair and replacement costs caused by corrosion.

[0004] In the traditional manufacturing process of titanium alloy oil drilling mud tanks, static annealing parameters are often set. However, during processing, the grain structure, phase composition, and residual stress of titanium alloys change with variations in process conditions. If static parameters are used in the annealing process without dynamic adjustment based on the actual state of the material, uneven annealing may occur, affecting the mechanical properties and corrosion resistance of the titanium alloy. In other words, static annealing parameters may not be sufficient to eliminate internal stresses generated during processing, leading to inconsistent strength, hardness, toughness, and other mechanical properties of the titanium alloy, thus impacting the performance and lifespan of the mud tank. If the annealing temperature is set too low, stress may not be completely eliminated, while excessively high temperatures may cause grain growth, affecting the alloy's toughness and fatigue resistance. Summary of the Invention

[0005] To address the aforementioned technical problems, this application provides a method for preparing a titanium alloy oil drilling mud tank, thereby resolving the existing issues.

[0006] The preparation method of the titanium alloy oil drilling mud tank of this application adopts the following technical solution: One embodiment of this application provides a method for preparing a titanium alloy oil drilling mud container, the method comprising the following steps: Aluminum, vanadium, tin, copper, iron, zirconium, and sponge titanium are cleaned and air-dried according to the raw material ratio; the cleaned and air-dried raw materials are subjected to multiple alloy smelting processes to obtain alloy ingots. The alloy ingot is subjected to annealing heat treatment, which includes a heating stage and a holding stage. The temperatures of the heating stage and the holding stage are controlled in real time. Specifically: The temperature field and deformation field on the surface of the alloy ingot at various moments during the annealing heat treatment process are obtained. Based on the dispersion and distribution range of temperature in all regions of the temperature field at the current moment, and the metric distance between the two regions with the largest temperature difference, the temperature fluctuation at the current moment is determined. Based on the difference between the temperature of each region in the temperature field at the current moment and the temperature of the remaining regions, determine the temperature outlier of each region at the current moment; use the numerical difference of the temperature outlier of all regions to determine the temperature control flag at the current moment. Based on the magnitude of the temperature outlier, each temperature drift region is selected from all regions at the current moment; the deformation consistency coefficient at the current moment is determined by the similarity between the temperature data of each temperature drift region at the current moment and its historical moments and the deformation data. By combining the temperature fluctuation, the deformation consistency coefficient, the temperature control flag, and the preset temperature control step size, the target temperature value at the current moment is corrected to obtain the controlled temperature value at the current moment. After annealing, the alloy ingot is solution treated, and after heat preservation, it is taken out and quickly water quenched to obtain a titanium alloy ingot. After cutting, forging, rolling and welding, a titanium alloy oil drilling mud can is obtained.

[0007] In one embodiment, the raw material ratio is: The aluminum content is 5.5-7.5% by mass, the vanadium content is 5.5-7.5% by mass, the tin content is 1.0-3.0% by mass, the copper content is 0.2-1.0% by mass, the iron content is 0.2-1.0% by mass, the zirconium content is 0.1-0.5% by mass, and the balance is sponge titanium with a purity of 99.5%.

[0008] In one embodiment, the alloy smelting process includes: After cleaning and air-drying, the raw materials are placed into the crucible of a non-consumable vacuum arc melting furnace, and the vacuum level in the furnace chamber is evacuated to [a certain value]. Below Pa, high-purity argon gas is filled into the furnace cavity as a protective gas to achieve a vacuum degree of 0.01~0.05MPa in the furnace cavity; The alloy is melted at a temperature of 2500℃, the melting time for each alloy melting is greater than or equal to 10 minutes, and the number of alloy meltings is not less than 10.

[0009] In one embodiment, the heating rate during the heating phase is 10~20℃ / min until the temperature reaches 750℃~850℃, and the duration of the heat preservation phase is 2~4h.

[0010] In one embodiment, the solution treatment is performed at a heating rate of 10-20°C / min, heated to 850°C-950°C, and held for 30-60 minutes.

[0011] In one embodiment, determining the temperature fluctuation includes: Calculate the temperature range of all regions in the temperature field at the current moment, and the metric distance between the two regions corresponding to the range, denoted as the first distance. The temperature fluctuation is positively correlated with the dispersion and the range, and negatively correlated with the first distance.

[0012] In one embodiment, determining the temperature control flag includes: Calculate the difference between the temperature of any region at the current moment and the mean temperature of all remaining regions, and determine the temperature outlier of the region at the current moment; For the temperature outlier of all regions at the current moment, if the number of positive values ​​is greater than the number of negative values, the temperature control flag is 1; if the number of positive values ​​is less than the number of negative values, the temperature control flag is -1; otherwise, the temperature control flag is 0.

[0013] In one embodiment, determining each temperature drift region includes: Sort all regions in descending order of the absolute value of temperature outliers at the current moment, and obtain the regions corresponding to the first preset number of temperature outliers as each temperature drift region.

[0014] In one embodiment, determining the deformation consistency coefficient at the current moment includes: For each temperature drift region at the current moment, the temperature at the current moment and all previous moments are obtained to form a temperature data sequence, and the deformation data at the current moment and all previous moments are obtained to form a deformation data sequence. The deformation consistency coefficient is the average of the correlation coefficients between the temperature data sequence and the deformation data sequence for all temperature drift regions at the current moment.

[0015] In one embodiment, correcting the target temperature value at the current moment to obtain the adjusted temperature value at the current moment includes: Calculate the product of the current temperature fluctuation, the deformation consistency coefficient, the temperature control flag, and the preset temperature control step size. The temperature value after control at the current time is the sum of the target temperature value at the current time and the product.

[0016] This application has at least the following beneficial effects: This application obtains the temperature and deformation fields on the surface of the alloy ingot at various moments during the annealing heat treatment process. Based on the dispersion and distribution range of the temperature in all regions of the temperature field at the current moment, and the metric distance between the two regions with the largest temperature difference, the temperature fluctuation at the current moment is determined. This improves the accuracy of temperature uniformity analysis during annealing, helps to analyze the suitability of the heat treatment temperature at the current moment, and improves the reliability of subsequent heat treatment temperature control. Based on the temperature difference between each region and the remaining regions in the temperature field at the current moment, the temperature outlier of each region at the current moment is determined. The temperature outlier reflects the temperature anomalies in each region at the current moment, which helps to enhance the targeted correction capability of the annealing process. Using the numerical differences in the temperature outliers of all regions, the temperature control flag at the current moment is determined, thus determining the annealing temperature. The direction of temperature control; based on the magnitude of the temperature outlier, each temperature drift region is selected from all regions at the current moment; by the similarity between the temperature data and deformation data of each temperature drift region at the current moment and its historical moments, the deformation consistency coefficient at the current moment is determined; this further reflects the adaptability of the annealing temperature at the current moment, embodies the temperature control effect during the annealing heat treatment process, and improves the accuracy of the determination of the temperature control strength during the annealing process; combined with the temperature fluctuation, the deformation consistency coefficient, the temperature control flag, and the preset temperature control step size, the target temperature value at the current moment is corrected to obtain the temperature value after control at the current moment, which improves the matching degree between the annealing temperature and the crystallization state in the titanium alloy ingot during the annealing process, enhances the accuracy of annealing temperature control, and improves the mechanical properties and corrosion resistance of the subsequently prepared titanium alloy oil drilling mud tank. Attached Figure Description

[0017] To more clearly illustrate the technical solutions and advantages in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 A flowchart illustrating the steps of a method for preparing a titanium alloy oil drilling mud container provided in this application; Figure 2 Flowchart for real-time temperature control of annealing heat treatment. Detailed Implementation

[0019] To further illustrate the technical means and effects adopted by this application to achieve the intended purpose of the invention, the following, in conjunction with the accompanying drawings and preferred embodiments, details the specific implementation, structure, features, and effects of a method for preparing a titanium alloy oil drilling mud tank according to this application. In the following description, different "one embodiment" or "another embodiment" do not necessarily refer to the same embodiment. Furthermore, specific features, structures, or characteristics in one or more embodiments can be combined in any suitable form.

[0020] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0021] The following describes in detail, with reference to the accompanying drawings, a specific scheme for the preparation method of a titanium alloy oil drilling mud tank provided in this application.

[0022] Example 1 Please see Figure 1 The document illustrates a flowchart of the preparation method of a titanium alloy oil drilling mud tank according to Embodiment 1 of this application. The method includes: Step S001: Clean and air-dry Al, V, Sn, Cu, Fe, Zr and sponge titanium according to the raw material ratio.

[0023] In the preparation process of the titanium alloy oil drilling mud tank, the raw material ratio is first set, and aluminum (Al), vanadium (V), tin (Sn), copper (Cu), iron (Fe), zirconium (Zr), and sponge titanium are cleaned and air-dried according to the raw material ratio. In this embodiment, the mass content of Al is 5.5%, the mass content of V is 5.5%, the mass content of Sn is 1.0%, the mass content of Cu is 0.2%, the mass content of Fe is 0.2%, the mass content of Zr is 0.1%, and the balance is sponge titanium with a purity of 99.5%.

[0024] In the raw material formulation, Al is an inexpensive material that can strengthen titanium alloys. Phase-stabilizing elements can significantly improve the specific strength and specific stiffness of titanium alloys. In the raw material proportions, V belongs to the isomorphic form. Phase-stabilizing elements make titanium alloys Phase capability is enhanced.

[0025] All the above raw materials were cleaned and dried using anhydrous ethanol and ultrasonic technology.

[0026] Step S002: The cleaned and dried raw materials are subjected to multiple alloy smelting processes to obtain alloy ingots.

[0027] After cleaning and drying, all raw materials are placed into the crucible of a non-consumable vacuum arc melting furnace, and the vacuum level inside the furnace is simultaneously evacuated to [a certain value]. The pressure is below 0.01 MPa. High-purity argon gas is introduced into the furnace cavity as a protective gas before arc melting, achieving a vacuum level of 0.01 MPa within the furnace cavity in this embodiment. During the melting process, a stirrer is used to ensure uniform mixing of the molten liquid.

[0028] During each melting process, the arc temperature is controlled at 2500℃, and the melting time is greater than or equal to 10 minutes to ensure that all alloy raw materials are completely melted into a liquid state. In this embodiment, the melting time is 10 minutes. After melting, the ingot is allowed to cool naturally to room temperature. After complete cooling, the ingot is flipped and subjected to a second melting process. The ingot is melted using the same method, i.e., melting-casting ingot-flipping-melting, and the melting process is repeated at least 10 times. In this embodiment, the melting process is repeated 10 times. Finally, the ingot is polished with a grinding wheel to remove the oxide layer on the surface of the ingot, resulting in an alloy ingot.

[0029] Step S003: The alloy ingot is subjected to annealing heat treatment, which includes a heating stage and a holding stage, and the temperature of the heating stage and the holding stage is controlled in real time.

[0030] The alloy ingot undergoes annealing heat treatment as follows: the obtained alloy ingot is placed in a vacuum / atmosphere tube furnace, argon gas is introduced as a protective gas, the heating rate is controlled at 10℃ / min until the temperature reaches 750℃, and the holding time is 2 hours. After the holding time is completed, it is allowed to cool naturally to room temperature. Based on the set heating rate, the temperature reaching 750℃, and the holding time of 2 hours, the temperature at each moment during the annealing heat treatment can be obtained and recorded as the target temperature at each moment.

[0031] Step S0031: Obtain the temperature field and deformation field on the surface of the alloy ingot at various times during the annealing heat treatment process.

[0032] In traditional annealing control methods, a fixed annealing temperature is often set. The purpose of the annealing stage is primarily to eliminate residual stress within the material, improve the crystallinity of the titanium alloy, and enhance its performance. However, due to variations in impurities and environmental factors for each batch of material, setting a fixed annealing temperature does not match the actual crystallinity requirements of the titanium alloy. This results in poor crystallinity consistency and negatively impacts the final performance of the prepared titanium alloy.

[0033] Based on the above analysis, this embodiment uses a non-contact temperature field and deformation dynamic measurement system in a tube furnace to acquire the temperature field and deformation field on the surface of the alloy ingot at various moments during the annealing heat treatment process. This data is used to represent the temperature distribution and deformation of different regions on the alloy ingot surface. The temperature field is measured using a high-temperature resistant fiber optic temperature sensor, and the deformation field is measured using a fiber Bragg grating sensor. Implementers can choose other feasible existing methods for measuring the temperature and deformation fields; this embodiment does not impose any restrictions on this.

[0034] In order to obtain the processing status of alloy ingots during the annealing heat treatment process in real time, this embodiment sets the acquisition time interval to 10 seconds. Implementers can set it according to the actual situation, and this embodiment does not impose any restrictions on it.

[0035] Step S0032: Based on the dispersion and distribution range of the temperature in all regions of the temperature field at the current moment, and the metric distance between the two regions with the largest temperature difference, determine the temperature fluctuation at the current moment.

[0036] The core function of annealing heat treatment on alloy ingots is to promote the homogenization of the internal structure of titanium alloys and to effectively eliminate the stress generated inside the alloy during processing. This can be achieved by adjusting... Harmony The distribution and proportion of phases are analyzed to optimize the morphology and size of internal crystal grains in the alloy, thereby promoting the plasticity and toughness of the titanium alloy and improving the performance of the product during subsequent processing.

[0037] During annealing heat treatment, applying a uniform temperature field causes the internal crystals of the alloy billet to undergo a gradual and integral state transformation, resulting in strong overall consistency. However, in practice, impurities and the heterogeneity of the billet can lead to inconsistent crystal transformation states during annealing, resulting in inconsistent temperature states on the surface of the billet across different regions, potentially causing temperature fluctuations and deviations.

[0038] Based on the above analysis, this embodiment determines the temperature fluctuation at the current moment by the degree of temperature dispersion and distribution range of all regions in the temperature field at the current moment, as well as the metric distance between the two regions with the largest temperature difference.

[0039] It should be noted that the degree of dispersion can be calculated using methods such as variance, standard deviation, and coefficient of variation, and this embodiment does not impose any restrictions on this.

[0040] In this embodiment, the expression for the temperature fluctuation at the current moment is: In the formula, Norm[] is the normalization function. This represents the standard deviation of temperature values ​​across all regions within the temperature field of the alloy billet at the current moment. The range of all temperature data in the temperature field of the alloy billet at the current moment represents the temperature distribution range of all regions in the temperature field at the current moment. The distance between the center points of the regions corresponding to the range of two temperature data points is denoted as the first distance. In this embodiment, the first distance is calculated using Euclidean distance. Implementers can choose other feasible distance calculation methods, such as Manhattan distance. ln() represents the logarithmic function with the natural constant e as the base.

[0041] It should be understood that the temperature fluctuation reflects the compatibility between the temperature parameters and the internal structural state of the alloy billet during the annealing stage. The standard deviation of all temperatures at the current moment measures the state transition of the crystal structure on the alloy surface under those temperature parameters. A larger overall standard deviation indicates a more dispersed temperature distribution across regions and a lower degree of compatibility. Furthermore, the greater the distance between the regions corresponding to the two temperature data points corresponding to the range, the greater the deviation in the alloy surface temperature. This indicates that the annealing process is affected by impurities, causing temperature values ​​in some regions to influence the temperature of the alloy billet. The phase undergoes a state transformation, changing from thin strips to plates. The temperature value does not match the overall microstructure of the alloy well, resulting in greater temperature fluctuations at the current moment.

[0042] Step S0033: Determine the temperature outlier of each region at the current moment based on the temperature difference between each region and the remaining regions in the temperature field at the current moment; determine the temperature control flag at the current moment by using the numerical difference of the temperature outlier of all regions.

[0043] When analyzing the temperature distribution of the temperature field at the current moment, the first step is to select the more prominent characteristic regions to reflect the overall temperature deviation. This is to avoid the fact that the overall difference of a large number of normal temperature regions is small throughout the calculation process, which could cause deviations in the analysis results.

[0044] Therefore, this embodiment analyzes the deviation between the temperature of a single region and the average temperature of all other regions based on the temperature of a single region at the current moment. The larger the deviation, the stronger the characterization ability of the single region and the better it can reflect the temperature adaptation of the alloy ingot surface at the current moment.

[0045] Therefore, this embodiment takes the i-th region at the current time as an example, calculates the difference between the temperature of the i-th region and the mean temperature of all other regions except the i-th region, and uses it as the temperature outlier of the i-th region at the current time. The further the temperature outlier of the i-th region is from 0, the more prominent the temperature of the i-th region is in the entire temperature field. The higher the significance of the temperature of the i-th region, the more necessary it is to analyze the i-th region.

[0046] To facilitate temperature control during the annealing heat treatment process, the number of positive temperature outliers (N1) and the number of negative temperature outliers (N2) in all regions at the current moment are counted. Based on the magnitudes of N1 and N2, the temperature control flag at the current moment is determined. Specifically: If This indicates that the number of regions below the average temperature at the current moment is small, but the temperature deviation from the average is large. To improve the uniformity of the alloy ingot surface temperature, the temperature needs to be increased, hence the establishment of a temperature control flag. On the contrary, if This indicates that the number of regions with temperatures above the average at the current moment is small, but the temperature deviation from the average is large. To improve the uniformity of the alloy ingot surface temperature, the temperature needs to be lowered, hence the establishment of a temperature control flag. ,like Then set .

[0047] Step S0034: Based on the magnitude of the temperature outlier, each temperature drift region is selected from all regions at the current moment; the deformation consistency coefficient at the current moment is determined by the similarity between the temperature data of each temperature drift region at the current moment and its historical moments and the deformation data.

[0048] Furthermore, the absolute values ​​of temperature outliers in all regions at the current moment are sorted in descending order. The regions corresponding to the top preset number of temperature outliers are designated as temperature drift regions, representing regions with more prominent temperature conditions at the current moment. In this embodiment, the preset number is set to 10, but implementers can set it according to actual conditions; this embodiment does not impose any restrictions on this.

[0049] For each temperature drift region at the current moment, the temperature at the current moment and all previous moments are obtained and arranged into a temperature data sequence according to the time sequence. The deformation data at the current moment and all previous moments are obtained and arranged into a deformation data sequence according to the time sequence.

[0050] It should be noted that the current moment and all moments before refer to historical moments during a single annealing heat treatment process.

[0051] The similarity between the temperature data sequence and the deformed data sequence at the current moment is analyzed to determine the deformation consistency coefficient at the current moment. Specifically, the correlation coefficient between the temperature data sequence and the deformed data sequence at the current moment is calculated. In this embodiment, the Pearson correlation coefficient is used for calculation. Implementers can choose other feasible similarity calculation methods, such as cosine similarity, etc. This embodiment does not limit this.

[0052] The mean of the Pearson correlation coefficients between the temperature data sequences and deformation data sequences of all temperature drift regions at the current moment is used as the deformation consistency coefficient at the current moment.

[0053] It should be understood that the temperature drift region represents an area where the surface temperature of the alloy ingot is relatively abnormal, reflecting that different parts of the alloy ingot may have experienced different heating temperatures, resulting in poor uniformity of the alloy structure and local uneven deformation on the surface of the alloy ingot. Therefore, there is a certain correlation between the temperature data and deformation data corresponding to the temperature drift region. The stronger the correlation, that is, the larger the deformation consistency coefficient, the worse the temperature control effect during the annealing heat treatment, the lower the degree of matching with the crystallization state inside the alloy ingot, and the greater the need to increase the temperature control during the annealing heat treatment.

[0054] Step S0035: Combine the temperature fluctuation, the deformation consistency coefficient, the temperature control flag, and the preset temperature control step size to correct the target temperature value at the current moment, and obtain the controlled temperature value at the current moment.

[0055] Finally, this embodiment calculates the product of the current temperature fluctuation, deformation consistency coefficient, temperature control flag, and preset temperature control step size, and uses the sum of the current target temperature value and the product as the current controlled temperature value.

[0056] It should be noted that, during the heating stage of the annealing heat treatment, in order to ensure the heating rate and control the reasonable heating of the annealing heat treatment, the temperature control step size is set to a range of [2, 4]. In this embodiment, the temperature control step size during the heating stage is set to 3. For the holding stage of the annealing heat treatment, in order to control the stability of the holding, it is necessary to reduce the temperature control step size, and the temperature control step size is set to a range of [0, 1]. In this embodiment, the temperature control step size during the holding stage is set to 0.5. The implementer can choose the temperature control step size within the range according to the actual situation, and this embodiment does not impose any restrictions on it.

[0057] It should be understood that temperature control is achieved based on the current distribution of the temperature and deformation fields. Poorer temperature matching results in greater temperature fluctuations on the alloy billet surface, leading to greater temperature volatility. In areas of poor temperature matching, the correlation between temperature and deformation data sequences in the temperature drift region is stronger, further confirming a significant deviation between temperature and the crystallization state of the alloy billet, necessitating increased temperature control. Temperature increases or decreases are achieved based on the status of temperature control flags.

[0058] The adjusted temperature value at the current moment is used as the temperature at the next moment in the annealing heat treatment of the alloy ingot, thus achieving real-time temperature control during the annealing heat treatment of the alloy ingot. The flowchart for real-time temperature control in annealing heat treatment is as follows: Figure 2 As shown.

[0059] Step S004: After annealing, the alloy ingot is solution treated, and after heat preservation, it is taken out and quickly water-quenched to obtain a titanium alloy ingot. After cutting, forging, rolling and welding, a titanium alloy oil drilling mud can is obtained.

[0060] After annealing heat treatment, the alloy ingot cooled to room temperature is subjected to solution treatment. The temperature is raised to 850℃ at a heating rate of 10℃ / min and held for 30min. After the holding time is completed, the ingot is taken out of the tube furnace and quickly water quenched to obtain the titanium alloy ingot.

[0061] Titanium alloy ingots are cut from the ingots according to the design drawings and size requirements of the mud tank. The ingots are then processed through forging, rolling and welding to obtain titanium alloy oil drilling mud tanks. The mud tanks are then sandblasted and painted to further improve their corrosion resistance and wear resistance.

[0062] Example 2 Please see Figure 1 The document illustrates a flowchart of the preparation method of a titanium alloy oil drilling mud tank according to Embodiment 2 of this application. The method includes: Step S001: Clean and air-dry Al, V, Sn, Cu, Fe, Zr and sponge titanium according to the raw material ratio.

[0063] In the preparation process of titanium alloy oil drilling mud tank, the raw material ratio is first set. In this embodiment, the mass content of Al is 6.5%, the mass content of V is 6.5%, the mass content of Sn is 2.0%, the mass content of Cu is 0.6%, the mass content of Fe is 0.6%, the mass content of Zr is 0.3%, and the balance is sponge titanium with a purity of 99.5%.

[0064] In the raw material formulation, Al is an inexpensive material that can strengthen titanium alloys. Phase-stabilizing elements can significantly improve the specific strength and specific stiffness of titanium alloys. In the raw material proportions, V belongs to the isomorphic form. Phase-stabilizing elements make titanium alloys Phase capability is enhanced.

[0065] All the above raw materials were cleaned and dried using anhydrous ethanol and ultrasonic technology.

[0066] Step S002: The cleaned and dried raw materials are subjected to multiple alloy smelting processes to obtain alloy ingots.

[0067] After cleaning and drying, all raw materials are placed into the crucible of a non-consumable vacuum arc melting furnace, and the vacuum level inside the furnace is simultaneously evacuated to [a certain value]. The pressure is below 0.03 MPa. High-purity argon gas is introduced into the furnace cavity as a protective gas before arc melting, achieving a vacuum level of 0.03 MPa within the furnace cavity in this embodiment. During the melting process, a stirrer is used to ensure uniform mixing of the molten liquid.

[0068] During each melting process, the arc temperature is controlled at 2500℃, and the melting time is greater than or equal to 10 minutes to ensure that all alloy raw materials are melted into a liquid state. In this embodiment, the melting time is 12 minutes. After melting, the ingot is allowed to cool naturally to room temperature. After complete cooling, the ingot is flipped and melted a second time using the same method: melting-casting-flipping-melting. The melting process is repeated at least 10 times, and in this embodiment, it is repeated 12 times. Finally, the ingot is polished with a grinding wheel to remove the oxide layer on the surface, resulting in an alloy ingot.

[0069] Step S003: The alloy ingot is subjected to annealing heat treatment, which includes a heating stage and a holding stage, and the temperature of the heating stage and the holding stage is controlled in real time.

[0070] The alloy ingot undergoes annealing heat treatment as follows: the obtained alloy ingot is placed in a vacuum / atmosphere tube furnace, argon gas is introduced as a protective gas, the heating rate is controlled at 15℃ / min until the temperature reaches 800℃, and the holding time is 3 hours. After the holding time is completed, it is allowed to cool naturally to room temperature. Based on the set heating rate, the temperature reaching 800℃, and the holding time of 3 hours, the temperature at each moment during the annealing heat treatment can be obtained and recorded as the target temperature at each moment.

[0071] The remaining steps are performed in the same manner as step S003 of Embodiment 1 of this application, and the temperature during the annealing heat treatment process is controlled in real time to obtain the alloy ingot after annealing heat treatment.

[0072] Step S004: After annealing, the alloy ingot is solution treated, and after heat preservation, it is taken out and quickly water-quenched to obtain a titanium alloy ingot. After cutting, forging, rolling and welding, a titanium alloy oil drilling mud can is obtained.

[0073] After annealing heat treatment, the alloy ingot cooled to room temperature is subjected to solution treatment. The temperature is raised to 900℃ at a rate of 15℃ / min and held for 45min. After the holding time is completed, the ingot is taken out of the tube furnace and quickly water quenched to obtain the titanium alloy ingot.

[0074] Titanium alloy ingots are cut from the ingots according to the design drawings and size requirements of the mud tank. The ingots are then processed through forging, rolling and welding to obtain titanium alloy oil drilling mud tanks. The mud tanks are then sandblasted and painted to further improve their corrosion resistance and wear resistance.

[0075] Example 3 Please see Figure 1 The document illustrates a flowchart of the preparation method of a titanium alloy oil drilling mud tank according to Embodiment 3 of this application. The method includes: Step S001: Clean and air-dry Al, V, Sn, Cu, Fe, Zr and sponge titanium according to the raw material ratio.

[0076] In the preparation process of titanium alloy oil drilling mud tank, the raw material ratio is first set. In this embodiment, the mass content of Al is 7.5%, the mass content of V is 7.5%, the mass content of Sn is 3.0%, the mass content of Cu is 1.0%, the mass content of Fe is 1.0%, the mass content of Zr is 0.5%, and the balance is sponge titanium with a purity of 99.5%.

[0077] In the raw material formulation, Al is an inexpensive material that can strengthen titanium alloys. Phase-stabilizing elements can significantly improve the specific strength and specific stiffness of titanium alloys. In the raw material proportions, V belongs to the isomorphic form. Phase-stabilizing elements make titanium alloys Phase capability is enhanced.

[0078] All the above raw materials were cleaned and dried using anhydrous ethanol and ultrasonic technology.

[0079] Step S002: The cleaned and dried raw materials are subjected to multiple alloy smelting processes to obtain alloy ingots.

[0080] After cleaning and drying, all raw materials are placed into the crucible of a non-consumable vacuum arc melting furnace, and the vacuum level inside the furnace is simultaneously evacuated to [a certain value]. The pressure is below 0.05 MPa. High-purity argon gas is introduced into the furnace cavity as a protective gas before arc melting, achieving a vacuum level of 0.05 MPa within the furnace cavity in this embodiment. During the melting process, a stirrer is used to ensure uniform mixing of the molten liquid.

[0081] During each melting process, the arc temperature is controlled at 2500℃, and the melting time is greater than or equal to 10 minutes to ensure that all alloy raw materials are melted into a liquid state. In this embodiment, the melting time is 15 minutes. After melting, the ingot is allowed to cool naturally to room temperature. After complete cooling, the ingot is flipped and melted a second time using the same method: melting-casting-flipping-melting. The melting process is repeated at least 10 times, and in this embodiment, it is repeated 15 times. Finally, the ingot is polished with a grinding wheel to remove the oxide layer on the surface, resulting in the alloy ingot.

[0082] Step S003: The alloy ingot is subjected to annealing heat treatment, which includes a heating stage and a holding stage, and the temperature of the heating stage and the holding stage is controlled in real time.

[0083] The alloy ingot undergoes annealing heat treatment as follows: the obtained alloy ingot is placed in a vacuum / atmosphere tube furnace, argon gas is introduced as a protective gas, the heating rate is controlled at 20℃ / min until the temperature reaches 850℃, and the holding time is 4 hours. After the holding time is completed, it is allowed to cool naturally to room temperature. Based on the set heating rate, the temperature reaching 850℃, and the holding time of 4 hours, the temperature at each moment during the annealing heat treatment can be obtained and recorded as the target temperature at each moment.

[0084] The remaining steps are performed in the same manner as step S003 of Embodiment 1 of this application, and the temperature during the annealing heat treatment process is controlled in real time to obtain the alloy ingot after annealing heat treatment.

[0085] Step S004: After annealing, the alloy ingot is solution treated, and after heat preservation, it is taken out and quickly water-quenched to obtain a titanium alloy ingot. After cutting, forging, rolling and welding, a titanium alloy oil drilling mud can is obtained.

[0086] After annealing heat treatment, the alloy ingot cooled to room temperature is subjected to solution treatment. The temperature is raised to 950℃ at a heating rate of 20℃ / min and held for 60min. After the holding time is completed, the ingot is taken out of the tube furnace and quickly water quenched to obtain the titanium alloy ingot.

[0087] Titanium alloy ingots are cut from the ingots according to the design drawings and size requirements of the mud tank. The ingots are then processed through forging, rolling and welding to obtain titanium alloy oil drilling mud tanks. The mud tanks are then sandblasted and painted to further improve their corrosion resistance and wear resistance.

[0088] Comparative Example 1 Comparative Example 1 was prepared using the same steps and parameters as Example 1 of this application. The difference was that the titanium alloy oil drilling mud tank was prepared by directly annealing the titanium alloy ingot according to the set heating rate and the temperature reached during the annealing heat treatment process. That is, the method of steps S0031 to S0035 was not used to control the annealing heat treatment temperature in real time, and the titanium alloy oil drilling mud tank prepared in Comparative Example 1 was obtained.

[0089] Comparative Example 2 Comparative Example 2 was prepared using the same steps and parameters as Example 2 of this application. The difference was that during the annealing heat treatment of the titanium alloy ingot, the annealing was carried out directly according to the set heating rate and the temperature reached. That is, the method of steps S0031 to S0035 was not used to control the annealing heat treatment temperature in real time, and the titanium alloy oil drilling mud tank prepared in Comparative Example 1 was obtained.

[0090] Comparative Example 3 Comparative Example 3 was prepared using the same steps and parameters as Example 3 of this application. The difference was that during the annealing heat treatment of the titanium alloy ingot, the annealing was carried out directly according to the set heating rate and the temperature reached. That is, the method of steps S0031 to S0035 was not used to control the annealing heat treatment temperature in real time, and the titanium alloy oil drilling mud tank prepared in Comparative Example 1 was obtained.

[0091] Table 1 shows the performance comparison results of the titanium alloy oil drilling mud tanks prepared in the embodiments of this application and the comparative examples.

[0092] Table 1 Performance Comparison Results As shown in Table 1, the titanium alloy oil drilling mud can prepared in this application can effectively improve the yield strength and tensile strength. Although there is a certain sacrifice in elongation, the weight loss shows that the corrosion resistance of the titanium alloy oil drilling mud can in this application is significantly improved.

[0093] It should be noted that the order of the embodiments described above is merely for descriptive purposes and does not represent the superiority or inferiority of the embodiments. Furthermore, specific embodiments of this specification have been described above. Additionally, the processes depicted in the accompanying drawings do not necessarily require a specific or sequential order to achieve the desired results. In some implementations, multitasking and parallel processing are possible or may be advantageous.

[0094] The various embodiments in this specification are described in a progressive manner. The same or similar parts between the various embodiments can be referred to each other. Each embodiment focuses on describing the differences from other embodiments.

[0095] The above-described embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them; modifications to the technical solutions described in the foregoing embodiments, or equivalent substitutions of some of the technical features, do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and should all be included within the protection scope of this application.

Claims

1. A method for preparing a titanium alloy oil drilling mud container, characterized in that, The method includes the following steps: Aluminum, vanadium, tin, copper, iron, zirconium, and sponge titanium are cleaned and air-dried according to the raw material ratio; the cleaned and air-dried raw materials are subjected to multiple alloy smelting processes to obtain alloy ingots. The alloy ingot is subjected to annealing heat treatment, which includes a heating stage and a holding stage. The temperatures of the heating stage and the holding stage are controlled in real time. Specifically: The temperature field and deformation field on the surface of the alloy ingot at various moments during the annealing heat treatment process are obtained. Based on the dispersion and distribution range of temperature in all regions of the temperature field at the current moment, and the metric distance between the two regions with the largest temperature difference, the temperature fluctuation at the current moment is determined. Based on the difference between the temperature of each region in the temperature field at the current moment and the temperature of the remaining regions, determine the temperature outlier of each region at the current moment; use the numerical difference of the temperature outlier of all regions to determine the temperature control flag at the current moment. Based on the magnitude of the temperature outlier, each temperature drift region is selected from all regions at the current moment; the deformation consistency coefficient at the current moment is determined by the similarity between the temperature data of each temperature drift region at the current moment and its historical moments and the deformation data. By combining the temperature fluctuation, the deformation consistency coefficient, the temperature control flag, and the preset temperature control step size, the target temperature value at the current moment is corrected to obtain the controlled temperature value at the current moment. After annealing, the alloy ingot is solution treated, and after heat preservation, it is taken out and quickly water quenched to obtain a titanium alloy ingot. After cutting, forging, rolling and welding, a titanium alloy oil drilling mud can is obtained.

2. The method for preparing a titanium alloy oil drilling mud container as described in claim 1, characterized in that, The raw material ratio is as follows: The aluminum content is 5.5-7.5% by mass, the vanadium content is 5.5-7.5% by mass, the tin content is 1.0-3.0% by mass, the copper content is 0.2-1.0% by mass, the iron content is 0.2-1.0% by mass, the zirconium content is 0.1-0.5% by mass, and the balance is sponge titanium with a purity of 99.5%.

3. The method for preparing a titanium alloy oil drilling mud container as described in claim 1, characterized in that, The alloy smelting process includes: After cleaning and air-drying, the raw materials are placed into the crucible of a non-consumable vacuum arc melting furnace, and the vacuum level in the furnace chamber is evacuated to [a certain value]. Below Pa, high-purity argon gas is filled into the furnace cavity as a protective gas to achieve a vacuum degree of 0.01~0.05MPa in the furnace cavity; The alloy is melted at a temperature of 2500℃, the melting time for each alloy melting is greater than or equal to 10 minutes, and the number of alloy meltings is not less than 10.

4. The method for preparing a titanium alloy oil drilling mud container as described in claim 1, characterized in that, The heating rate during the heating stage is 10~20℃ / min until the temperature reaches 750℃~850℃, and the holding stage lasts for 2~4 hours.

5. The method for preparing a titanium alloy oil drilling mud container as described in claim 1, characterized in that, The solution treatment is performed at a heating rate of 10~20℃ / min, heated to 850℃~950℃, and held for 30min~60min.

6. The method for preparing a titanium alloy oil drilling mud container as described in claim 1, characterized in that, The determination of the temperature fluctuation includes: Calculate the temperature range of all regions in the temperature field at the current moment, and the metric distance between the two regions corresponding to the range, denoted as the first distance. The temperature fluctuation is positively correlated with the dispersion and the range, and negatively correlated with the first distance.

7. The method for preparing a titanium alloy oil drilling mud container as described in claim 1, characterized in that, The determination of the temperature control flag includes: Calculate the difference between the temperature of any region at the current moment and the mean temperature of all remaining regions, and determine the temperature outlier of the region at the current moment; For the temperature outlier of all regions at the current moment, if the number of positive values ​​is greater than the number of negative values, the temperature control flag is 1; if the number of positive values ​​is less than the number of negative values, the temperature control flag is -1; otherwise, the temperature control flag is 0.

8. The method for preparing a titanium alloy oil drilling mud container as described in claim 1, characterized in that, The determination of each temperature drift region includes: Sort all regions in descending order of the absolute value of temperature outliers at the current moment, and obtain the regions corresponding to the first preset number of temperature outliers as each temperature drift region.

9. The method for preparing a titanium alloy oil drilling mud container as described in claim 1, characterized in that, Determining the deformation consistency coefficient at the current moment includes: For each temperature drift region at the current moment, the temperature at the current moment and all previous moments are obtained to form a temperature data sequence, and the deformation data at the current moment and all previous moments are obtained to form a deformation data sequence. The deformation consistency coefficient is the average of the correlation coefficients between the temperature data sequence and the deformation data sequence for all temperature drift regions at the current moment.

10. The method for preparing a titanium alloy oil drilling mud container as described in claim 1, characterized in that, The step of correcting the target temperature value at the current moment to obtain the adjusted temperature value at the current moment includes: Calculate the product of the current temperature fluctuation, the deformation consistency coefficient, the temperature control flag, and the preset temperature control step size. The temperature value after control at the current time is the sum of the target temperature value at the current time and the product.

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