Experimental method for simulating erosion corrosion of gathering and transportation pipeline of oil and gas field and related equipment

Abstract

The invention discloses an experimental method for simulating erosion corrosion of an oil and gas field gathering and transportation pipeline and related equipment, and relates to the technical field of corrosion protection of the oil and gas field gathering and transportation pipeline. The medium component content comprises ion content, gas content and bacteria content; formulating simulation dynamic experiment parameters according to the medium component content and the operation parameters; the simulation dynamic experiment parameters comprise experiment medium temperature, experiment medium flow velocity, experiment gas content and experiment bacteria content; determining a dynamic corrosion experiment device according to the simulation dynamic experiment parameters; calculating the corrosion rate according to the experimental material subjected to the dynamic corrosion experiment; and determining corrosion morphology and corrosion products according to the experimental material after the dynamic corrosion experiment. According to the invention, a perfect multi-factor synergistic dynamic corrosion experiment of pipeline scouring-gas factor-bacteria factor can be carried out.

Description

Technical Field

[0001] The present application relates to the technical field of corrosion protection for oil and gas field gathering and transportation pipelines, and in particular to an experimental method for simulating erosion and corrosion of oil and gas field gathering and transportation pipelines and related equipment. Background Art

[0002] The corrosion problem of gathering and transportation pipelines in oil and gas fields is prominent. Studies have found that factors such as scouring, carbon dioxide, and SRB corrosion are important causes of corrosion and perforation of gathering and transportation pipelines. However, most of the existing research work only focuses on the study of material corrosion failure mechanism under a single influencing factor. However, pipeline corrosion is usually caused by the combined action of multiple factors. The current experimental equipment and methods for studying material corrosion under the synergistic action of multiple factors are not perfect, and it is impossible to quickly and accurately formulate an analysis method for the corrosion mechanism of gathering and transportation pipelines, which affects the efficiency of related work. Summary of the invention

[0003] The purpose of this application is to provide a simulated oil and gas field gathering and transportation pipeline erosion corrosion test method and related equipment, which can carry out a complete multi-factor synergistic dynamic corrosion experiment.

[0004] To achieve the above objectives, this application provides the following solutions:

[0005] In a first aspect, the present application provides a method for simulating erosion corrosion of oil and gas field gathering and transportation pipelines, the method for simulating erosion corrosion of oil and gas field gathering and transportation pipelines comprising:

[0006] Obtaining the medium component content of the on-site produced fluid and the operating parameters of the oil and gas field gathering and transportation pipeline; the medium component content includes: ion content, gas content and bacterial content;

[0007] According to the content of the medium components and the operating parameters of the oil and gas field gathering and transportation pipeline, the simulation dynamic experimental parameters are formulated; the simulation dynamic experimental parameters include: experimental medium temperature, experimental medium flow rate, experimental gas content and experimental bacteria content; the experimental medium is used to simulate the on-site produced fluid;

[0008] Determine a dynamic corrosion experiment device according to the simulated dynamic experiment parameters; the dynamic corrosion experiment device is used to simulate the experiment parameters to perform a dynamic corrosion experiment;

[0009] Calculate the corrosion rate based on the experimental material after the dynamic corrosion test;

[0010] The corrosion morphology and corrosion products are determined based on the experimental materials after the dynamic corrosion test.

[0011] Optionally, obtaining the medium component content of the on-site produced fluid specifically includes:

[0012] Obtaining on-site produced fluid and gas samples;

[0013] Determine the ion content in the produced fluid; the ion content includes: anion type and content, cation type and content;

[0014] Determining the SRB bacterial content in the produced fluid;

[0015] Determine the gas content in the gas sample; the gas content includes: CO 2 content.

[0016] Optionally, simulating the experimental parameters to conduct a dynamic corrosion experiment specifically includes:

[0017] Set up multi-parameter combination experimental conditions with different experimental temperatures, different experimental flow rates, different experimental gas contents, and different experimental bacterial contents;

[0018] The medium component content of the on-site produced fluid was used as a control group, and the experiment was conducted using a single variable method.

[0019] Optionally, the experimental gas content is CO 2 content;

[0020] The experimental bacterial content is the SRB bacterial content.

[0021] Optionally, the oil and gas field gathering and transportation pipeline operation parameters include: pipeline operation pressure, medium temperature, medium flow rate and pipeline material.

[0022] Optionally, after determining the corrosion morphology and corrosion products according to the experimental material after the dynamic corrosion experiment, the method further includes:

[0023] Determine the influence weight of each factor on the corrosion rate; the factors include: experimental medium flow rate, experimental gas content and experimental bacteria content;

[0024] Determine the mechanism by which each factor accelerates or inhibits the development of corrosion.

[0025] In a second aspect, the present application provides an experimental device for simulating the erosion and corrosion experimental method of oil and gas field gathering and transportation pipelines as described above, the experimental device comprising: a temperature control unit, a rotation unit and a gas control unit;

[0026] The temperature control unit is used to control the temperature of the experimental medium; the experimental medium is used to simulate the on-site produced fluid;

[0027] The rotating unit is used to control the mutual movement between the experimental medium and the sample material to simulate different experimental medium flow rates;

[0028] The gas control unit is used to simulate different experimental gas contents.

[0029] In a third aspect, the present application provides a computer device, comprising: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement any of the above-described simulated oil and gas field gathering and transportation pipeline erosion and corrosion experimental methods.

[0030] In a fourth aspect, the present application provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements any of the above-described experimental methods for simulating erosion and corrosion of oil and gas field gathering and transportation pipelines.

[0031] In a fifth aspect, the present application provides a computer program product, including a computer program, which, when executed by a processor, implements any of the above-mentioned simulated oil and gas field gathering and transportation pipeline erosion and corrosion experimental methods.

[0032] According to the specific embodiments provided in this application, this application discloses the following technical effects:

[0033] The present application provides a method and related equipment for simulating the scouring and corrosion experiment of oil and gas field gathering and transportation pipelines, the method comprising: obtaining the medium component content of the on-site produced fluid and the operating parameters of the oil and gas field gathering and transportation pipeline; the medium component content comprises: ion content, gas content and bacterial content; according to the medium component content and the operating parameters of the oil and gas field gathering and transportation pipeline, the simulation dynamic experimental parameters are formulated; the simulation dynamic experimental parameters comprise: experimental medium temperature, experimental medium flow rate, experimental gas content and experimental bacterial content; the experimental medium is used to simulate the on-site produced fluid; according to the simulated dynamic experimental parameters, a dynamic corrosion experimental device is determined; the dynamic corrosion experimental device is used to simulate the experimental parameters for dynamic corrosion experiments; the corrosion rate is calculated according to the experimental materials after the dynamic corrosion experiment; the corrosion morphology and corrosion products are determined according to the experimental materials after the dynamic corrosion experiment. The present application obtains the ion content, gas content and bacterial content of the on-site produced fluid and simulates through the experimental parameters, thereby taking into account the synergistic effect of gas and bacteria, the present application obtains the operating parameters of the oil and gas field gathering and transportation pipeline, and simulates through the experimental medium temperature and experimental medium flow rate in the experimental parameters, so the synergistic effect of pipeline scouring is also taken into account. Therefore, the present application can conduct a complete dynamic corrosion experiment of pipeline scouring-gas factor-bacteria factor multi-factor synergistic effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0035] Figure 1 This is an application environment diagram of a method for simulating erosion and corrosion of oil and gas field gathering and transportation pipelines in one embodiment of the present application;

[0036] Figure 2 A schematic flow chart of a method for simulating erosion and corrosion of oil and gas field gathering and transportation pipelines provided in one embodiment of the present application;

[0037] Figure 3 A schematic flow chart of a method for simulating erosion and corrosion of oil and gas field gathering and transportation pipelines provided in another embodiment of the present application;

[0038] Figure 4 A schematic diagram of corrosion rates at different flow rates provided by another embodiment of the present application;

[0039] Figure 5 A schematic diagram of macroscopic corrosion morphology at different flow rates provided by another embodiment of the present application;

[0040] Figure 6 A schematic diagram of microscopic corrosion morphology at different flow rates provided by another embodiment of the present application;

[0041] Figure 7 A schematic diagram of the structure of a computer device provided in one embodiment of the present application. DETAILED DESCRIPTION

[0042] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0043] The present application provides a method for simulating the erosion and corrosion of oil and gas field gathering and transportation pipelines. Specifically, the present invention provides a method for simulating the erosion and corrosion of oil and gas field gathering and transportation pipelines. 2-SRB bacteria synergistic dynamic corrosion experimental method, the steps are as follows: collect typical downhole produced fluids from oil and gas fields, analyze their components, combine the process parameters of oil and gas field gathering and transportation pipelines, including operating pressure, temperature, flow rate, material, etc., formulate experimental research parameters, including simulated solution preparation, SRB bacteria culture, gas composition ratio, flow rate control, etc., according to the experimental parameter requirements, build a dynamic corrosion experimental device, carry out dynamic corrosion experiments on target materials, after the test, take out the experimental materials to calculate the corrosion rate, combine surface analysis technology and phase analysis technology (SEM, XRD, etc.) to analyze the corrosion morphology, corrosion products, etc., and study the corrosion law and mechanism of the target pipeline material under the synergistic effect of flushing-CO2-SRB bacteria. The present invention uses a dynamic corrosion experimental device to carry out dynamic corrosion simulation experiments based on the corrosion environment and operating parameters of oil and gas field gathering and transportation pipelines, which can be used to study the corrosion law and mechanism of the target material under the synergistic effect of flushing-CO2-SRB bacteria.

[0044] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, the present application is further described in detail below with reference to the accompanying drawings and specific implementation methods.

[0045] The experimental method for simulating erosion and corrosion of oil and gas field gathering and transportation pipelines provided in the embodiment of the present application can be applied to Figure 1 In the application environment shown. Among them, the terminal 102 communicates with the server 104 through the network. The data storage system can store the data that the server 104 needs to process. The data storage system can be set up separately, integrated on the server 104, or placed on the cloud or other servers. The terminal 102 can send the medium component content of the on-site produced fluid and the operating parameters of the oil and gas field gathering and transportation pipeline to the server 104. After receiving the medium component content of the on-site produced fluid and the operating parameters of the oil and gas field gathering and transportation pipeline, the server 104 formulates the simulated dynamic experimental parameters according to the medium component content and the operating parameters of the oil and gas field gathering and transportation pipeline; the simulated dynamic experimental parameters include: experimental medium temperature, experimental medium flow rate, experimental gas content and experimental bacteria content; determine the dynamic corrosion experimental device according to the simulated dynamic experimental parameters; the dynamic corrosion experimental device is used to simulate the experimental parameters to perform dynamic corrosion experiments; calculate the corrosion rate according to the experimental materials after the dynamic corrosion experiment; determine the corrosion morphology and corrosion products according to the experimental materials after the dynamic corrosion experiment. The server 104 can feedback the obtained corrosion morphology and corrosion products to the terminal 102. In addition, in some embodiments, the experimental method for simulating erosion and corrosion of oil and gas field gathering and transportation pipelines can also be implemented independently by the server 104 or the terminal 102. For example, the terminal 102 can directly process the medium component content of the on-site produced fluid and the operating parameters of the oil and gas field gathering and transportation pipelines, or the server 104 can obtain the medium component content of the on-site produced fluid and the operating parameters of the oil and gas field gathering and transportation pipelines from the data storage system and process them.

[0046] The terminal 102 may be, but is not limited to, various desktop computers, laptop computers, smart phones, tablet computers, IoT devices, and portable wearable devices. The IoT devices may be smart speakers, smart TVs, smart air conditioners, smart vehicle-mounted devices, etc. The portable wearable devices may be smart watches, smart bracelets, head-mounted devices, etc. The server 104 may be implemented as an independent server or a server cluster consisting of multiple servers, or may be a cloud server.

[0047] In an exemplary embodiment, Figure 2 As shown, a method for simulating erosion and corrosion of oil and gas field gathering and transportation pipelines is provided. The method is executed by a computer device, and can be executed by a computer device such as a terminal or a server alone, or can be executed by a terminal and a server together. In the embodiment of the present application, the method is applied to Figure 1 The server 104 in the example is used for explanation, and the steps include the following steps S1 to S5.

[0048] in:

[0049] S1. Obtaining the medium component content of the on-site produced fluid and the operating parameters of the oil and gas field gathering and transportation pipeline; the medium component content includes: ion content, gas content and bacterial content.

[0050] In this embodiment, the medium component content of the on-site produced fluid is obtained by first obtaining the on-site produced fluid and gas samples; then determining the ion content in the produced fluid; the ion content includes: anion type and content, cation type and content; determining the SRB bacteria content in the produced fluid; determining the gas content in the gas sample; the gas content includes: CO 2 content.

[0051] In this embodiment, typical downhole produced fluid from oil and gas fields is collected and its components are analyzed.

[0052] Medium composition analysis: Collect the produced fluid and gas samples on site, and use chromatography to analyze the main ion content and gas content of the produced fluid, including the type and content of anions, the type and content of cations, CO 2 Content, etc.

[0053] SRB bacteria analysis: For the produced liquid that may contain SRB bacteria, the bacterial liquid sampling analysis is carried out, and the SRB bacteria content is determined according to GB / T14643.5-2009 "Determination of bacteria and algae in industrial circulating cooling water Part 5: MPN method for determination of sulfate-reducing bacteria".

[0054] Then, the operating parameters of the oil and gas field gathering and transportation pipeline are collected; the operating parameters of the oil and gas field gathering and transportation pipeline include: pipeline operating pressure, medium temperature, medium flow rate, pipeline material, etc.

[0055] In addition, this embodiment also includes analysis of the material composition of the target pipeline, and chemical composition analysis of the sample is performed using a direct reading spectrometer, including analysis of C, Si, Mn, S, P, Cr, Ni, Mo, Nb and Ti elements.

[0056] S2. According to the content of the medium components and the operating parameters of the oil and gas field gathering and transportation pipeline, the simulation dynamic experimental parameters are formulated; the simulation dynamic experimental parameters include: experimental medium temperature, experimental medium flow rate, experimental gas content and experimental bacterial content. The experimental medium is used to simulate the on-site produced fluid; wherein the experimental gas content is CO 2 Content; The experimental bacterial content is the SRB bacterial content.

[0057] S3, determining a dynamic corrosion experiment device according to the simulated dynamic experiment parameters; the dynamic corrosion experiment device is used to simulate the experiment parameters to perform a dynamic corrosion experiment. The experiment device is composed of a temperature control unit, a rotation unit, a gas control unit, and a sample installation unit.

[0058] The experimental parameters are simulated to conduct a dynamic corrosion experiment, specifically including: setting multi-parameter combination experimental conditions of different experimental temperatures, different experimental flow rates, different experimental gas contents and different experimental bacterial contents; taking the medium component content of the on-site produced fluid as a control group, and conducting the experiment using a single variable method.

[0059] In this embodiment, dynamic experimental conditions are formulated based on the analysis of oil and gas field produced fluids and the operating parameters of the gathering and transportation pipelines, and dynamic corrosion experiments of target materials are carried out. Including:

[0060] Experimental solution (experimental medium): The produced liquid is subjected to a component analysis, and the content of the analysis is the content of various ions in the solution. According to the analysis results of the produced liquid ion content, a simulated solution is prepared.

[0061] Experimental parameters: set different experimental temperatures, experimental flow rates, CO 2 The experimental conditions were combined with multiple parameters such as content and SRB bacteria content to study the synergistic effect of different parameters. Specifically, the experimental parameters of the control group were determined according to the on-site produced fluid and operating conditions, including temperature, flow rate, CO 2 Then, compared with the control group, the single variable method was used to change the temperature, flow rate, CO 2 Multi-factor combination experiments were carried out on parameters such as content and SRB bacterial content. Finally, the experimental results under different experimental conditions were compared and analyzed to summarize the experimental rules.

[0062] Sample specifications: There are 2 specifications, namely 60mm×20mm×3mm weight loss samples, 3 in each group; 20mm×20mm×3mm test analysis samples, 2 in each group. The size of the test piece can be adjusted according to the actual situation. Among them, the weight loss samples and test analysis samples are both experimental materials, just in different groups.

[0063] S4. Calculate the corrosion rate based on the experimental material after the dynamic corrosion experiment.

[0064] The corrosion rate calculation is to remove oil, clean, blow dry with cold air, and weigh the weightless sample before the experiment, which is recorded as M. After the experiment, the experimental material is taken out. The weightless sample is pickled with pickling solution, rinsed with alcohol, blow dried with cold air, and weighed, which is recorded as M1. The corrosion rate is calculated according to the formula. The corrosion rate calculation formula is as follows:

[0065]

[0066] Where: R—corrosion rate, mm / a; M—mass of sample before the experiment, g; M1—mass of sample after the experiment, g; S—total area of ​​the sample, cm 2 ; T—experimental time, h; D—density of material, kg / m 3 .

[0067] S5. Determine the corrosion morphology and corrosion products based on the experimental materials after the dynamic corrosion test.

[0068] In this embodiment, a dynamic corrosion experiment device is used to carry out a dynamic corrosion experiment on the target experimental material. After the experiment, the experimental material is taken out to calculate the corrosion rate, and the corrosion morphology and corrosion products are analyzed by combining surface analysis technology and phase analysis technology (SEM, XRD, etc.) to study the corrosion law and mechanism of the target pipeline material under the synergistic action of scouring-CO2-SRB bacteria.

[0069] The corrosion morphology, corrosion product analysis, etc., include:

[0070] Macroscopic morphology analysis: After the experiment, the weight loss sample was taken out. Before pickling, it was first cleaned and dried with cold air. The corrosion morphology characteristics of the sample surface were observed and photographed with a high-definition camera. After pickling, the macroscopic morphology was observed and photographed in accordance with the steps before pickling.

[0071] Microscopic morphology analysis: After the experiment, the test analysis samples were taken out, cleaned, and dried with cold air. Before pickling, the morphology of corrosion products on the sample surface was microscopically analyzed using a scanning electron microscope. After pickling, the above steps were repeated to perform microscopic analysis on the surface morphology of the sample after pickling.

[0072] Product analysis: After the experiment, the test analysis samples are taken out, cleaned, dried with cold air, and the corrosion product components and elements are analyzed by scanning electron microscope energy spectrum test or corrosion product XRD test.

[0073] Comprehensive corrosion rate, corrosion morphology and corrosion product analysis results to analyze the target pipeline material in erosion-CO 2 -SRB bacteria synergistic effect of corrosion law and mechanism, by comparing and analyzing different flow rates, different CO 2 The changing trend of corrosion rate under different SRB concentrations, corrosion morphology characteristics and corrosion product composition are analyzed to analyze the influence weight of each factor on the corrosion rate and the mechanism of each factor on the acceleration or inhibition of corrosion development.

[0074] It can be seen from the above technical solution that, compared with the prior art, the beneficial effects of this embodiment include:

[0075] In this embodiment, typical downhole produced fluids from oil and gas fields are collected, and their components are analyzed. Experimental research parameters are formulated in combination with process parameters of oil and gas field gathering and transportation pipelines, including operating pressure, temperature, flow rate, material, etc., including simulated solution preparation, SRB bacteria culture, gas composition ratio, flow rate control, etc. According to the experimental parameter requirements, a dynamic corrosion experimental device is built to carry out dynamic corrosion experiments on target materials. After the experiment, the experimental materials are taken out to calculate the corrosion rate, and the corrosion morphology and corrosion products are analyzed in combination with surface analysis technology and phase analysis technology (SEM, XRD, etc.). Through the above steps, the corrosion law and mechanism of the target pipeline material under the synergistic action of flushing-CO2-SRB bacteria can be studied.

[0076] Based on the same inventive concept, an embodiment of the present application also provides an experimental device for implementing the above-mentioned experimental method for simulating erosion and corrosion of oil and gas field gathering and transportation pipelines, wherein the experimental device includes: a temperature control unit, a rotation unit and a gas control unit.

[0077] The temperature control unit is used to control the temperature of the experimental medium; the experimental medium is used to simulate the on-site produced fluid; the rotation unit is used to control the mutual movement between the experimental medium and the sample material, simulating different experimental medium flow rates; the gas control unit is used to simulate different experimental gas contents.

[0078] As an optional implementation, the experimental device in this embodiment includes: a temperature control unit, a rotation unit, a gas control unit, and a sample installation unit. Specifically, the temperature control unit is to wind a heating belt on the experimental container, cooperate with a temperature sensor and an adjustment module to achieve temperature control, so that different experimental medium temperatures can be obtained. The rotation unit uses an electromagnetic rotor to control the medium flow rate, and the sample is fixed, so as to achieve mutual movement between the experimental medium and the sample, simulating different flow rate conditions. The gas control unit uses a gas cylinder, cooperates with the inlet and outlet holes on the lid of the experimental container, and introduces different proportions of gas into the experimental medium to achieve different CO 2 The sample installation unit includes a test container and a sample fixture, and the sample is fixed on the bottom edge of the container. This device can realize dynamic corrosion experiments under different temperatures, different flow rates and different gas composition combinations.

[0079] In another exemplary embodiment, Figure 3 As shown in the figure, a simulation method for erosion corrosion test of oil and gas field gathering and transportation pipelines is provided to achieve the target pipeline material in erosion-CO 2 -Study on the corrosion law and mechanism under the synergistic action of SRB bacteria. By collecting typical downhole produced fluids from oil and gas fields, analyzing their components, combining the process parameters of oil and gas field gathering and transportation pipelines, formulating experimental research parameters, building a dynamic corrosion experimental device, and conducting dynamic corrosion experiments on target materials, the target pipeline material can be eroded by -CO 2 -Study on the corrosion laws and mechanisms under the synergistic action of SRB bacteria, providing a basis for on-site corrosion control and material selection.

[0080] The specific steps include:

[0081] Collect typical downhole produced fluids from oil and gas fields and conduct component analysis.

[0082] Collect the operating parameters of oil and gas field gathering and transportation pipelines.

[0083] Dynamic experimental parameters are formulated based on the analysis of oil and gas field produced fluids and the operating parameters of the gathering and transportation pipelines.

[0084] A dynamic corrosion experimental device was built, which consisted of a temperature control unit, a rotation unit, a gas control unit, and a sample installation unit.

[0085] Dynamic corrosion experiments on target materials are carried out using dynamic corrosion experimental equipment.

[0086] After the test, the test materials were taken out to calculate the corrosion rate, and the corrosion morphology and corrosion products were analyzed by combining surface analysis technology and phase analysis technology (SEM, XRD, etc.) to study the corrosion morphology and corrosion products of the target pipeline material under erosion-CO 2 -Corrosion laws and mechanisms under the synergistic action of SRB bacteria.

[0087] Wherein, the collecting of typical downhole produced fluid from oil and gas fields and conducting component analysis includes:

[0088] Medium composition analysis: Determination of the content of operating medium components, including anion types and contents, cation types and contents, CO 2 Content, etc.

[0089] Microbial analysis: For the produced fluids that may contain microorganisms, bacterial fluid sampling and analysis are carried out, and the types and contents of microorganisms are determined through microbial 16srDNA testing and microbial culture methods.

[0090] The oil and gas field gathering and transportation pipeline operation parameters include: pipeline operation pressure, medium temperature, medium flow rate, pipeline material, etc.

[0091] Wherein, the dynamic corrosion experimental device includes: a temperature control unit, a rotation unit, a gas control unit, and a sample installation unit.

[0092] Among them, the target pipeline material composition analysis uses a direct reading spectrometer to perform chemical composition analysis on the sample, including analysis of C, Si, Mn, S, P, Cr, Ni, Mo, Nb and Ti elements.

[0093] Among them, the dynamic experimental conditions are formulated according to the analysis of oil and gas field produced fluid and the operating parameters of the gathering and transportation pipeline, and the dynamic corrosion experiment of the target material is carried out. It includes:

[0094] Experimental solution: Prepare the simulated solution according to the analysis of the produced fluid components;

[0095] Experimental parameters: set different experimental temperatures, experimental flow rates, CO 2 The experimental conditions of multiple parameters such as content and SRB bacterial content were combined to study the synergistic effect of different parameters.

[0096] Sample specifications: There are 2 specifications, namely 60mm×20mm×3mm weight loss samples, 3 in each group; 20mm×20mm×3mm test analysis samples, 2 in each group. The size of the test piece can be adjusted according to the actual situation.

[0097] Among them, for the corrosion rate calculation, after the experiment is over, the test material is taken out, the weightless sample is pickled with acid solution, rinsed with alcohol, dried with cold air, and then weighed to calculate the corrosion rate.

[0098] The corrosion morphology and corrosion product analysis include:

[0099] Macroscopic morphology analysis: After the experiment, the weight loss sample was taken out. Before pickling, it was first cleaned and dried with cold air. The corrosion morphology characteristics of the sample surface were observed and photographed with a high-definition camera. After pickling, the macroscopic morphology was observed and photographed in accordance with the steps before pickling.

[0100] Microscopic morphology analysis: After the experiment, the test analysis samples were taken out, cleaned, and dried with cold air. Before pickling, the morphology of corrosion products on the sample surface was microscopically analyzed using a scanning electron microscope. After pickling, the above steps were repeated to perform microscopic analysis on the surface morphology of the sample after pickling.

[0101] Product analysis: After the experiment, the test analysis samples are taken out, cleaned, dried with cold air, and the components and elements of the corrosion products are analyzed by scanning electron microscope energy spectrum test or XRD test of corrosion product sampling.

[0102] Among them, the results of corrosion rate, corrosion morphology and corrosion product analysis were comprehensively analyzed to analyze the target pipeline material under erosion-CO 2 -Corrosion laws and mechanisms under the synergistic action of SRB bacteria.

[0103] Among them, Cl in produced water - Concentration 7240-21900mg / L, belongs to CaCl 2 Type, pH value 6-8.5, the ion content of produced water is shown in the following table, and the SRB bacteria content is as high as 700,000 / ml. The ion content of produced water is shown in Table 1:

[0104] Table 1 Ion content of produced water

[0105]

[0106] In this embodiment, dynamic corrosion test parameters are formulated based on the on-site produced water analysis and operation parameters, mainly studying the temperature, saturated CO 2 , the corrosion law and mechanism of materials at different flow rates under the condition of SRB bacteria. The experimental parameters are shown in Table 2 below:

[0107] Table 2 Experimental parameters

[0108]

[0109] In this embodiment, after the experiment, the solution characteristics were observed, the SRB bacteria content was determined, and the analysis and test results are shown in Table 3 below. Under the four flow rate conditions, the solutions after the test had a slight rotten egg smell, were translucent, had a small amount of black precipitate, and had a large amount of SRB bacteria, indicating that hydrogen sulfide was generated in the solution due to the activity of SRB bacteria during the experiment.

[0110] Table 3 Experimental phenomena

[0111] Flow rate, m / s odor Solution precipitation SRB content 0 Slight rotten egg smell Translucent, light black A small amount of black precipitate 2×10^7 2 Slight rotten egg smell Translucent, light black A small amount of black precipitate 1.5×10^7 3.4 Slight rotten egg smell Translucent, light black A small amount of black precipitate ＞1.4×10^9 6.9 Slight rotten egg smell Translucent, light black A small amount of black precipitate 2×10^7

[0112] In this embodiment, after the test, the sample was taken out, pickled, and the corrosion rate was calculated. The results are shown below. Figure 4 As can be seen from the figure, the corrosion rate under dynamic conditions is higher than that under static conditions. Under dynamic conditions, the corrosion rate is the highest at 2m / s, and the corrosion rates are similar at 3.4m / s and 6.9m / s. The macroscopic corrosion morphology is shown below Figure 5 , microscopic corrosion morphology Figure 6 ,in, Figure 6 (a) is the microscopic corrosion morphology at a flow rate of 0 m / s by SEM. Figure 6 (b) is the microscopic corrosion morphology at a flow rate of 2m / s by SEM. Figure 6 (c) is the microscopic corrosion morphology at a flow rate of 3.4 m / s by SEM. Figure 6 (d) in the figure is the microscopic corrosion morphology at a flow rate of 6.9 m / s by SEM. Figure 5 It can be seen that under static conditions (0m / s), there is a small amount of rust on the surface of the sample, and the metal matrix can basically be seen; at 2m / s, there is more floating rust on the surface of the sample, and it is relatively loose; at 3.4m / s and 6.9m / s, there is relatively less floating rust on the surface of the sample, and a black rust layer is attached to local areas.

[0113] At static conditions, the product film is smooth and flat, and the S content is the highest, reflecting that bacteria are more likely to form a film on the substrate surface under static conditions; at 2 m / s, the product film is incomplete and begins to peel off, but the S content is still high, reflecting that the bacterial film formation is inhibited to a certain extent at this time, but it is still good. At the same time, the local product film is destroyed due to the scouring effect, resulting in a significant increase in the corrosion rate; at 3.4 and 6.9 m / s, the product film is incomplete, the roughness increases, and the S content decreases significantly, reflecting that it is difficult for bacteria to form a film on the substrate surface due to the scouring effect at this time. The corrosion mainly comes from the scouring effect, and the corrosion rate is lower than that of 2 m / s. The composition analysis of the corrosion products is shown in Table 4 below.

[0114] Table 4 Corrosion product composition analysis

[0115]

[0116]

[0117] In an exemplary embodiment, a computer device is provided. The computer device may be a server or a terminal. The internal structure diagram thereof may be as follows: Figure 7As shown. The computer device includes a processor, a memory, an input / output interface (Input / Output, referred to as I / O) and a communication interface. Among them, the processor, the memory and the input / output interface are connected through a system bus, and the communication interface is connected to the system bus through the input / output interface. Among them, the processor of the computer device is used to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, a computer program and a database. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The input / output interface of the computer device is used to exchange information between the processor and an external device. The communication interface of the computer device is used to communicate with an external terminal through a network connection. When the computer program is executed by the processor, a method for simulating the scouring and corrosion experiment of an oil and gas field gathering and transportation pipeline is implemented.

[0118] Those skilled in the art will understand that Figure 7 The structure shown in the figure is only a block diagram of a part of the structure related to the solution of the present application, and does not constitute a limitation on the computer device to which the solution of the present application is applied. The specific computer device may include more or fewer components than those shown in the figure, or combine certain components, or have a different arrangement of components.

[0119] In an exemplary embodiment, a computer device is further provided, including a memory and a processor, wherein a computer program is stored in the memory, and the processor implements the steps in the above-mentioned method embodiments when executing the computer program.

[0120] In an exemplary embodiment, a computer-readable storage medium is provided, storing a computer program, and when the computer program is executed by a processor, the steps in the above method embodiments are implemented.

[0121] In an exemplary embodiment, a computer program product is provided, including a computer program, and when the computer program is executed by a processor, the steps in the above method embodiments are implemented.

[0122] It should be noted that the user information (including but not limited to user device information, user personal information, etc.) and data (including but not limited to data used for analysis, stored data, displayed data, etc.) involved in this application are all information and data authorized by the user or fully authorized by all parties, and the collection, use and processing of relevant data must comply with relevant regulations.

[0123] Those of ordinary skill in the art can understand that all or part of the processes in the above-mentioned embodiment methods can be completed by instructing the relevant hardware through a computer program, and the computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to the memory, database or other medium used in the embodiments provided in the present application can include at least one of non-volatile and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetic random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. By way of illustration and not limitation, RAM may be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM).

[0124] The database involved in each embodiment provided in this application may include at least one of a relational database and a non-relational database. The non-relational database may include a distributed database based on blockchain, etc., but is not limited thereto. The processor involved in each embodiment provided in this application may be a general-purpose processor, a central processing unit, a graphics processor, a digital signal processor, a programmable logic device, a data processing logic device based on quantum computing, etc., but is not limited thereto.

[0125] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0126] This article uses specific examples to illustrate the principles and implementation methods of this application. The description of the above embodiments is only used to help understand the method and core ideas of this application. At the same time, for those skilled in the art, according to the ideas of this application, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting this application.

Claims

1. A method for simulating erosion and corrosion of oil and gas field gathering and transportation pipelines, characterized in that: The experimental method for simulating erosion and corrosion of oil and gas field gathering and transportation pipelines comprises: Obtaining the medium component content of the on-site produced fluid and the operating parameters of the oil and gas field gathering and transportation pipeline; the medium component content includes: ion content, gas content and bacterial content; According to the content of the medium components and the operating parameters of the oil and gas field gathering and transportation pipeline, the simulation dynamic experimental parameters are formulated; the simulation dynamic experimental parameters include: experimental medium temperature, experimental medium flow rate, experimental gas content and experimental bacteria content; the experimental medium is used to simulate the on-site produced fluid; Determine a dynamic corrosion experiment device according to the simulated dynamic experiment parameters; the dynamic corrosion experiment device is used to simulate the experiment parameters to perform a dynamic corrosion experiment; Calculate the corrosion rate based on the experimental material after the dynamic corrosion test; The corrosion morphology and corrosion products are determined based on the experimental materials after the dynamic corrosion test.

2. The method for simulating erosion and corrosion of oil and gas field gathering and transportation pipelines according to claim 1 is characterized in that: The obtaining of the medium component content of the on-site produced fluid specifically includes: Obtaining on-site produced fluid and gas samples; Determine the ion content in the produced fluid; the ion content includes: anion type and content, cation type and content; Determining the SRB bacterial content in the produced fluid; Determine the gas content in the gas sample; the gas content includes: CO2 content.

3. The method for simulating erosion and corrosion of oil and gas field gathering and transportation pipelines according to claim 1 is characterized in that: The dynamic corrosion experiment is carried out by simulating the experimental parameters, specifically including: Set up multi-parameter combination experimental conditions with different experimental temperatures, different experimental flow rates, different experimental gas contents, and different experimental bacterial contents; The medium component content of the on-site produced fluid was used as a control group, and the experiment was conducted using a single variable method.

4. The method for simulating erosion and corrosion of oil and gas field gathering and transportation pipelines according to claim 1 is characterized in that: The experimental gas content is CO2 content; The experimental bacterial content is the SRB bacterial content.

5. The method for simulating erosion and corrosion of oil and gas field gathering and transportation pipelines according to claim 1 is characterized in that: The oil and gas field gathering and transportation pipeline operation parameters include: pipeline operation pressure, medium temperature, medium flow rate and pipeline material.

6. The method for simulating erosion and corrosion of oil and gas field gathering and transportation pipelines according to claim 1, characterized in that: After determining the corrosion morphology and corrosion products according to the experimental material after the dynamic corrosion experiment, the method further includes: Determine the influence weight of each factor on the corrosion rate; the factors include: experimental medium flow rate, experimental gas content and experimental bacteria content; Determine the mechanism by which each factor accelerates or inhibits the development of corrosion.

7. An experimental device for simulating the erosion and corrosion experimental method of oil and gas field gathering and transportation pipelines according to claim 1, characterized in that: The experimental device comprises: a temperature control unit, a rotation unit and a gas control unit; The temperature control unit is used to control the temperature of the experimental medium; the experimental medium is used to simulate the on-site produced fluid; The rotating unit is used to control the mutual movement between the experimental medium and the sample material to simulate different experimental medium flow rates; The gas control unit is used to simulate different experimental gas contents.

8. A computer device comprising: A memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the experimental method for simulating erosion and corrosion of oil and gas field gathering and transportation pipelines as described in any one of claims 1 to 6.

9. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the experimental method for simulating erosion and corrosion of oil and gas field gathering and transportation pipelines as described in any one of claims 1 to 6 is implemented.

10. A computer program product, comprising a computer program, characterized in that When the computer program is executed by a processor, the experimental method for simulating erosion and corrosion of oil and gas field gathering and transportation pipelines as described in any one of claims 1 to 6 is implemented.

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