Performance optimization design method for stirring device of mixing tank of well cementation equipment

Abstract

The invention discloses a performance optimization design method of a stirring device for a mixing tank of well cementation equipment, which comprises the following steps of: S1, determining the test level of each test factor and establishing an orthogonal test table by taking the stirring uniformity as an optimization target and taking main parameters influencing the optimization target in the stirring device as test factors; s2, obtaining test samples of each group of orthogonal tests, and establishing a three-dimensional model for simulation test analysis; s3, performing orthogonal test range analysis according to a simulation test analysis result, and determining a theoretical optimal design scheme; s4, carrying out reverse verification on the theoretical optimal design scheme, and verifying the rationality of the theoretical optimal design scheme; if the reasonability is true, the performance optimization design of the mixing tank stirring device is completed; and if the rationality is not established, returning to S1 to re-determine the test level of each test factor. The structure and the rotating speed of the stirring device of the mixing tank of the well cementation equipment are optimized, the design time and cost are saved, and the stirring uniformity of the optimized stirring device is obviously improved compared with that of the stirring device before optimization.

Description

Technical Field

[0001] The present invention relates to the technical field of a stirring device for a mixing tank of a cementing equipment, and more specifically, to a performance optimization design method for a stirring device for a mixing tank of a cementing equipment. Background Art

[0002] The mixing tank is the main place for slurry mixing in cementing equipment. It is used to temporarily store cement slurry and provide space for mixing water and dry cement to make the density of the mixed cement slurry uniform. The stirring device is an important tool for slurry mixing in the mixing tank. The effect of its stirring operation directly affects the quality of cement slurry.

[0003] Existing stirring devices lack mature design methods. Conventional mixing tank stirring devices have unstable mixing effects on high-density cement slurry, and there are phenomena such as uneven slurry mixing and solid precipitation. Some oil and gas fields even report the problem of mixing tank bottom clogging. Therefore, the present invention proposes a mixing tank stirring device performance optimization method, which can design a mixing tank stirring device with stronger mixing ability and more uniform stirring according to needs, thereby extending the life cycle of the cementing equipment mixing tank and improving the cementing operation quality. Summary of the invention

[0004] An object of the present invention is to solve at least the above problems and to provide at least the advantages which will be described hereinafter.

[0005] In order to achieve these purposes and other advantages according to the present invention, a method for optimizing the performance of a stirring device for a mixing tank of a cementing equipment is provided, comprising the following steps: S1. Taking stirring uniformity as the optimization target and the main parameters affecting the optimization target in the stirring device as the test factors, the variation range of each test factor is given, and the test level of each test factor is determined within the corresponding variation range, an orthogonal test table is established, and an orthogonal test scheme is determined; S2. Obtain test samples for each group of orthogonal tests according to the orthogonal test table, and perform simulation test analysis using fluid simulation software; S3. According to the results of simulation test analysis, orthogonal test range analysis is carried out to determine the theoretical optimal design scheme; S4. Carry out reverse verification on the theoretical optimal design scheme to verify the rationality of the theoretical optimal design scheme; if the rationality is established, complete the performance optimization design of the mixing tank stirring device, and obtain the performance optimization design scheme of the stirring device of the mixing tank of the cementing equipment; if the rationality is not established, return to step S1 to redetermine the test level of each test factor, and repeat steps S1 to S4 until the rationality of the obtained theoretical optimal design scheme is established.

[0006] Preferably, in step S1, the test factors include main structural parameters of the stirring device that affect stirring uniformity and the rotation speed of the stirring device.

[0007] Preferably, in step S2, for each group of orthogonal tests, 5 to 7 sections are equally spaced in the mixing tank in the fluid simulation software, the average density of the cement slurry in each section is obtained, and the range of the average density of the cement slurry is calculated as the test result of the group of orthogonal tests, and the mixing uniformity corresponding to the current orthogonal test is judged by the range of the average density of the cement slurry.

[0008] Preferably, the simulation test analysis of each group of orthogonal tests in step S2 specifically includes the following steps: S21, establishing a three-dimensional geometric model of the mixing tank, and parameterizing the stirring device according to the test samples of the orthogonal test; S22. In the fluid simulation software, the entire area in the mixing tank is set as a fluid domain, the fluid domain in the rotating space of the two layers of stirring blades of each stirring device is set as a rotating domain, and the fluid domain outside the rotating domain is set as a stationary domain; S23, setting the stirring shaft in the stirring device as a rotating shaft, and the rotation speed of the rotating shaft corresponds to the rotation speed of the stirring device in each group of orthogonal test samples; S24, using fluid simulation software to perform hexahedral meshing; S25. Calculate the required water and cement according to the density calculation formula of cement slurry and perform multiphase flow simulation analysis; S26. Obtain the average density of cement slurry in each cross section, and calculate the range of the average density of cement slurry as the test result of this group of orthogonal tests.

[0009] Preferably, in step S25, the multiphase flow model selects the Euler multiphase flow model, and the turbulence model selects Model, the wall function uses the standard wall function.

[0010] Preferably, in step S4, the structural parameter values ​​in the theoretical optimal design scheme are brought into the three-dimensional geometric model for parameterized setting. After being imported into the fluid simulation software, the rotational speed of the stirring device in the theoretical optimal design scheme is set as the rotational speed of the rotating shaft, and fluid simulation is performed to verify the rationality of the theoretical optimal design scheme.

[0011] The present invention has at least the following beneficial effects: 1. The performance optimization design method for the stirring device of the mixing tank of cementing equipment provided by the present invention takes stirring uniformity as the optimization target, selects several main parameters affecting stirring uniformity for orthogonal test design, and uses fluid simulation software to perform simulation test analysis to obtain the theoretical optimal design scheme of the stirring device, and performs reverse verification to form a performance optimization design scheme for the stirring device of the mixing tank, thereby achieving the coordinated optimization of the stirring performance of the stirring device of the mixing tank and maximizing the stirring uniformity of the mud in the mixing tank.

[0012] 2. The performance optimization design method for the stirring device of the mixing tank of cementing equipment provided by the present invention determines the uniformity of the slurry by calculating the extreme difference values ​​of the mud density at different positions. Compared with the previous method of determining the uniformity of the mixture by the flow rate, it has certain advantages and can provide a reference for the performance optimization of the stirring device of the mixing tank of cementing equipment.

[0013] 3. The performance optimization design method for the stirring device of the mixing tank of cementing equipment provided by the present invention is not only applicable to the stirring device of the mixing tank of cementing equipment, but also applicable to other stirring devices of similar structures, providing direction for the efficient optimization design of other stirring devices and having strong practicality.

[0014] Other advantages, objectives and features of the present invention will be embodied in part through the following description, and in part will be understood by those skilled in the art through study and practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a flow chart of the method for optimizing the performance design of the stirring device for the mixing tank of cementing equipment according to the present invention; Figure 2 It is a structural schematic diagram of the stirring device of the present invention; Figure 3 It is a schematic diagram of the multiphase flow calculation domain of the stirring device of the present invention; Figure 4 It is a schematic diagram of the positions of various cross sections in the mixing tank of the present invention; DETAILED DESCRIPTION

[0016] The present invention is further described in detail below in conjunction with the accompanying drawings so that those skilled in the art can implement the invention with reference to the description.

[0017] It should be noted that the experimental methods described in the following embodiments are conventional methods unless otherwise specified, and the reagents and materials are commercially available unless otherwise specified; in the description of the present invention, the terms "lateral", "longitudinal", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0018] like Figure 1 As shown, the present invention provides a method for optimizing the performance of a stirring device for a mixing tank of cementing equipment, comprising the following steps: S1. Taking stirring uniformity as the optimization target and the main parameters affecting the optimization target in the stirring device as the test factors, the variation range of each test factor is given, and the test level of each test factor is determined within the corresponding variation range, an orthogonal test table is established, and an orthogonal test scheme is determined; S2. Obtain test samples for each group of orthogonal tests according to the orthogonal test table, and perform simulation test analysis using fluid simulation software; S3. According to the results of simulation test analysis, orthogonal test range analysis is carried out to determine the theoretical optimal design scheme; S4. Carry out reverse verification on the theoretical optimal design scheme to verify the rationality of the theoretical optimal design scheme; if the rationality is established, complete the performance optimization design of the mixing tank stirring device, and obtain the performance optimization design scheme of the stirring device of the mixing tank of the cementing equipment; if the rationality is not established, return to step S1 to redetermine the test level of each test factor, and repeat steps S1 to S4 until the rationality of the obtained theoretical optimal design scheme is established.

[0019] In this technical solution, an orthogonal experimental scheme is first designed, and simulation test analysis is carried out using fluid simulation software to obtain the theoretically optimal design scheme of the stirring device, and reverse verification is performed to form an optimized design scheme for the performance of the mixing tank stirring device, thereby achieving the coordinated optimization of the stirring performance of the mixing tank stirring device and maximizing the uniformity of mud stirring in the mixing tank.

[0020] In step S1, the test factors include the main structural parameters of the stirring device that affect the stirring uniformity and the rotation speed of the stirring device. Figure 2As shown, taking the mixing tank 1 of a cementing equipment as an example, there are two stirring devices arranged inside, namely the first stirring device 2 and the second stirring device 3, and the stirring shafts of the two stirring devices are provided with upper and lower layers of stirring blades. The selected experimental factors include six structural parameters and the rotational speeds n′ and n″ of the two stirring devices. The six structural parameters are: the stirring blade diameter φ′ of the first stirring shaft 2, the upper and lower layer spacing d′ of the stirring blades, the height h′ of the lower layer of blades from the bottom of the tank, and the stirring blade diameter φ″ of the second stirring device 3, the upper and lower layer spacing d″ of the stirring blades, and the height h″ of the lower layer of blades from the bottom of the tank; further, the structural parameters of the two stirring devices may be inconsistent, and the rotational speeds may also be different. Three test levels are given for each of the experimental factors to establish L 27 (3 11 )Orthogonal experiment table for orthogonal experiment.

[0021] In step S2, each group of orthogonal test samples is the test level value corresponding to each test factor in each group of orthogonal tests. For each group of orthogonal tests, 5 to 7 sections are equally spaced in the mixing tank in the fluid simulation software, the average density of cement slurry in each section is obtained, and the range value R of the average density of cement slurry is calculated as the test result of the orthogonal test. The mixing uniformity corresponding to the current orthogonal test scheme is judged by the range value R of the average density of cement slurry. The smaller the range value R of the average density of cement slurry is, the more uniform the mixing is.

[0022] Specifically, the simulation test analysis of each group of orthogonal tests in step S2 specifically includes the following steps: S21. Establish a three-dimensional geometric model of the mixing tank, and perform parameterized settings on the stirring device according to the test samples of the orthogonal test; the establishment of the three-dimensional geometric model and the parameterized settings can be performed through three-dimensional modeling software, such as SolidWorks.

[0023] Parameterization is performed in the three-dimensional modeling software according to the test level values ​​corresponding to the structural parameters of the stirring device in each group of orthogonal test samples.

[0024] S22, such as Figure 3 As shown, in the fluid simulation software, the entire area in the mixing tank is set as the fluid domain, the fluid domain of the rotating space of the two layers of stirring blades of each stirring device is set as the rotating domain, and the fluid domain outside the rotating domain is set as the static domain; Fluent software is used in this embodiment.

[0025] S23, setting the stirring shaft in the stirring device as a rotating shaft, and the rotation speed of the rotating shaft corresponds to the rotation speed of the stirring device in each group of orthogonal test samples.

[0026] S24. Use the fluid simulation software Fluent Meshing to perform hexahedral mesh division.

[0027] S25. Calculate the required water and cement according to the density calculation formula of cement slurry and perform multiphase flow simulation analysis; The density calculation formula of cement slurry is: (1) In formula (1), ρ is the mud density, m is the water-cement ratio, , where ρ 水 =0.997g / cm 3 , 灰 =3.1g / cm 3 , from which the volume ratio of water to cement ash is calculated, and the volume of water and cement ash to be added is calculated based on the total volume of the required mixture in the mixing tank.

[0028] Among them, the multiphase flow model selects the Euler multiphase flow model, and the turbulence model selects Model, the wall function uses the standard wall function.

[0029] S27, obtain the average density of cement slurry in each section, and calculate the range value R of the average density of cement slurry as the test result of this group of orthogonal tests. Figure 4 As shown, in this embodiment, six sections are cut according to the height, and the average density of cement slurry in each section is ρ0, ρ 200 , 400 , 600 , 800 , 1000 , then the average density range of cement slurry is: R=max(ρ0,ρ 200 ,ρ 400 ,ρ 600 ,ρ 800 ,ρ 1000 )-min(ρ0,ρ 200 ,ρ 400 ,ρ 600 ,ρ 800 ,ρ 1000 ).

[0030] The orthogonal test table established in step S1 and the results of the simulation test analysis of each group of orthogonal test schemes in step S2 are shown in Table 1.

[0031] Table 1 Orthogonal test table and test results In step S3, the orthogonal test results are subjected to orthogonal test range analysis, and the analysis results are shown in Table 2; Table 2 Range analysis results In Table 2, k1, k2, and k3 are the means of the R values ​​corresponding to the three test levels of each test factor; r is the range, which is the difference between the maximum and minimum values ​​of k1, k2, and k3 of each test factor, that is, the contribution value of each test factor to the mixing uniformity. Then, the single factor sensitivity ranking of each test factor can be obtained, φ′>d′>n′>d″>h″>φ″>h′>n″, which provides a basis for the subsequent adjustment of the test level of each test factor. Considering that the smaller the R value obtained by the orthogonal test, the better the mixing uniformity effect, the minimum value of k1, k2, and k3 of each test factor is taken to obtain the theoretical optimal design scheme: φ′-3, d′-3, h′-1, n′-2, φ′′-1, d′′-3, h′′-1, n′′-3.

[0032] In step S4, the structural parameter values ​​corresponding to the obtained theoretical optimal design scheme are brought into the three-dimensional geometric model for parameter setting. After being imported into the fluid simulation software, the stirring shaft speed corresponding to the theoretical optimal design scheme is set as the rotating shaft speed, and fluid simulation is performed. The rationality of the performance optimization design of the mixing tank stirring device is verified according to whether the average density range of the cement slurry corresponding to the theoretical optimal design scheme is less than the average density range of the cement slurry obtained by each group of orthogonal tests. That is, if the average density range of the cement slurry obtained by the theoretical optimal design scheme is less than each R value obtained in Table 1, then the rationality is established. If the rationality is established, the performance optimization design of the mixing tank stirring device is completed, and the performance optimization design scheme of the stirring device for the mixing tank of the cementing equipment is obtained; if the rationality is not established, return to step S1 to re-determine the test level of each test factor, and recalculate according to the subsequent steps until the rationality of the obtained theoretical optimal design scheme is established.

[0033] Although the embodiments of the present invention have been disclosed as above, they are not limited to the applications listed in the specification and the implementation modes, and they can be fully applied to various fields suitable for the present invention. For those familiar with the art, additional modifications can be easily implemented. Therefore, without departing from the general concept defined by the claims and the scope of equivalents, the present invention is not limited to the specific details and the illustrations shown and described herein.

Claims

1. A method for optimizing the performance of a stirring device for a mixing tank of cementing equipment, characterized in that: The following steps are involved: S1. Taking stirring uniformity as the optimization target and the main parameters affecting the optimization target in the stirring device as the test factors, the variation range of each test factor is given, and the test level of each test factor is determined within the corresponding variation range, an orthogonal test table is established, and an orthogonal test scheme is determined; S2. Obtain test samples for each group of orthogonal tests according to the orthogonal test table, and perform simulation test analysis using fluid simulation software; S3. According to the results of simulation test analysis, orthogonal test range analysis is carried out to determine the theoretical optimal design scheme; S4. Carry out reverse verification on the theoretical optimal design solution to verify the rationality of the theoretical optimal design solution; If the rationality is established, the performance optimization design of the mixing tank stirring device is completed, and the performance optimization design scheme of the stirring device of the mixing tank of the cementing equipment is obtained; if the rationality is not established, return to step S1 to re-determine the test level of each test factor, and repeat steps S1 to S4 until the rationality of the theoretically optimal design scheme obtained is established.

2. The method for optimizing the performance of a stirring device for a mixing tank of cementing equipment according to claim 1, characterized in that: In step S1, the test factors include main structural parameters of the stirring device that affect stirring uniformity and the rotation speed of the stirring device.

3. The method for optimizing the performance of a stirring device for a mixing tank of cementing equipment according to claim 2, characterized in that: In step S2, for each group of orthogonal tests, 5 to 7 sections are evenly spaced in the mixing tank in the fluid simulation software, the average density of the cement slurry in each section is obtained, and the range of the average density of the cement slurry is calculated as the test result of the group of orthogonal tests. The mixing uniformity corresponding to the current orthogonal test is judged by the range of the average density of the cement slurry.

4. The method for optimizing the performance of a stirring device for a mixing tank of cementing equipment according to claim 2, characterized in that: The simulation test analysis of each group of orthogonal tests in step S2 specifically includes the following steps: S21, establishing a three-dimensional geometric model of the mixing tank, and parameterizing the stirring device according to the test samples of the orthogonal test; S22. In the fluid simulation software, the entire area in the mixing tank is set as a fluid domain, the fluid domain in the rotating space of the two layers of stirring blades of each stirring device is set as a rotating domain, and the fluid domain outside the rotating domain is set as a stationary domain; S23, setting the stirring shaft in the stirring device as a rotating shaft, and the rotation speed of the rotating shaft corresponds to the rotation speed of the stirring device in each group of orthogonal test samples; S24, using fluid simulation software to perform hexahedral meshing; S25. Calculate the required water and cement according to the density calculation formula of cement slurry and perform multiphase flow simulation analysis; S26. Obtain the average density of cement slurry in each cross section, and calculate the range of the average density of cement slurry as the test result of this group of orthogonal tests.

5. The method for optimizing the performance of a stirring device for a mixing tank of cementing equipment according to claim 4, characterized in that: In step S25, the multiphase flow model selects the Euler multiphase flow model, and the turbulence model selects Model, the wall function uses the standard wall function.

6. The method for optimizing the performance of a stirring device for a mixing tank of cementing equipment according to claim 4, characterized in that: In step S4, the structural parameter values ​​in the theoretical optimal design scheme are brought into the three-dimensional geometric model for parameterized setting. After being imported into the fluid simulation software, the rotation speed of the stirring device in the theoretical optimal design scheme is set to the rotation speed of the rotating shaft, and fluid simulation is performed to verify the rationality of the theoretical optimal design scheme.

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