A method and system for corrosion monitoring in oil and gas field stations

Abstract

The present invention provides a method and system for monitoring corrosion in oil and gas field stations, which relates to the field of corrosion monitoring in oil and gas field stations, and can solve the problem that designers can only judge the corrosion rate change of the medium, the approximate remaining life of the equipment and pipelines, and which areas have a greater risk of corrosion leakage under the existing working conditions. Due to the use of the method of automatic monitoring of the internal corrosion rate, linkage between the corrosion rate and the dosing control system, and linkage between the dosing control system and the medium component detection facility, the technical problem of being unable to accurately control the internal corrosion risk of equipment and pipelines in a short time is effectively solved, thereby achieving the goal of transferring the internal corrosion risk from post-control to pre-control, and realizing the coordinated development of corrosion data monitoring and corrosion risk control. There is no need to stop production and start fire, and the comprehensive cost is low. The internal corrosion of equipment and pipelines in oil and gas field stations is fully controlled throughout the life cycle, effectively improving the integrity management level of oil and gas field stations. The present invention is used for oilfield supervision.

Description

Technical Field

[0001] The invention relates to the technical field of corrosion monitoring and dynamic corrosion protection in a ground system of an oil and gas field, and in particular to a method and system for corrosion monitoring for an oil and gas field station. Background Art

[0002] At present, the monitoring and collection of corrosion data at oil and gas field stations adopts a regular uploading method. The corrosion monitoring data is usually displayed on the computer screen or in the form of corrosion rate in data reports, with the specific unit being: millimeter / year (mm / a). Designers can only judge the corrosion rate change of the medium under the existing working conditions, the approximate remaining life of the equipment and pipelines, and which areas have a greater risk of corrosion leakage based on the change pattern or size of the corrosion data. However, the source of each monitoring data is the equipment or pipeline in operation. Therefore, it is impossible to take corrosion risk control measures in a short period of time for the risks found. Summary of the invention

[0003] The purpose of the present invention is to provide a method and system for corrosion monitoring in oil and gas field stations, which can effectively shorten the corrosion risk prevention and control cycle, transfer the internal corrosion risk from post-event control to pre-event control, and coordinate corrosion data monitoring and corrosion risk control, without the need to stop production and start fire, with low overall cost. The present invention can achieve full life cycle control of internal corrosion of oil and gas field station equipment and pipelines, and can effectively improve the integrity management level of oil and gas field stations.

[0004] According to a first aspect of an embodiment of the present invention, a method for corrosion monitoring for an oil and gas field station is provided, the method comprising:

[0005] The corrosion monitoring data analysis and processing system obtains data information of the corrosion detection points, and processes the data information of the corrosion detection points. The processing is to identify and convert the received data information of the corrosion detection points. According to the requirements of the process flow, n monitoring units are set, and the data information of the n monitoring units are analyzed respectively. After analyzing and judging, the monitoring data analysis and processing system outputs n process monitoring data, where n≥1;

[0006] The corrosion inhibitor filling control system transmits the start-up information of the mth dosing pump after receiving the n process monitoring data. After the dosing pump is started, the corrosion inhibitor storage tank adds corrosion inhibitor to the mth corrosion inhibitor dosing point, where m≥1.

[0007] Preferably, the process flow includes oil-gas-water three-phase separation, produced water treatment, water supply and drainage, and fire protection system. According to the requirements of the process flow, n process monitoring units are set, and the data information of the n process monitoring units are analyzed respectively. The monitoring data in the respective monitoring units of the process flows of oil-gas-water three-phase separation, produced water treatment, water supply and drainage, and fire protection system are weighted averaged. The nth process monitoring unit feeds back the corrosion rate data of the nth unit in real time, and the unit of the corrosion rate data is mm / a; wherein, millimeter / year (mm / a);

[0008] When the corrosion rate A of the nth process monitoring unit is greater than or equal to the corrosion rate threshold Amax, the mth corrosion inhibitor dosing pump is started to add corrosion inhibitor to the mth corrosion inhibitor dosing point until the corrosion rate A is less than or equal to the corrosion rate threshold Amin, and the nth corrosion inhibitor dosing pump is stopped.

[0009] Preferably, the corrosion inhibitor filling control system also receives medium flow data information of medium flow and component change information in n processes detected and analyzed in real time by the medium flow analysis system, and outputs n process detection data;

[0010] The medium flow analysis system analyzes the medium flow data information and outputs the medium flow rate change, water content change, adjustment of the corrosion inhibitor filling amount, and adjustment of the corrosion inhibitor filling type and proportion.

[0011] Preferably, the medium flow data information includes hydrogen sulfide content, carbon dioxide content, sulfate-reducing bacteria content, and water content, which are obtained by a hydrogen sulfide detector, a carbon dioxide detector, a sulfate-reducing bacteria detector, and a water content analyzer, respectively;

[0012] Among them, adjusting the type and proportion of corrosion inhibitor injection means that when the corrosion rate A is greater than or equal to the corrosion rate threshold Amax for the first time, the dosing pump is started by default to add the compound corrosion inhibitor solution, and the initial value of the dosing flow rate is 30 mg / L; the adjustment of the amount of corrosion inhibitor injection is to configure the weight of the compound corrosion inhibitor solution in proportion, and the proportion is 1:1:3 of ethylenediaminetetramethylenephosphonic acid: polymaleic acid: polyepoxysuccinic acid.

[0013] Preferably, when at least two of the hydrogen sulfide content, carbon dioxide content, and sulfate-reducing bacteria content are simultaneously greater than or equal to the corresponding threshold value max, at least two corrosion inhibitors are selected for injection at the same time:

[0014] When the hydrogen sulfide content is greater than or equal to the corresponding threshold value H2Smax, the amount of hydrogen sulfide corrosion inhibitor added = initial value * [1-(actual hydrogen sulfide content / H2Smax)];

[0015] When the carbon dioxide content is greater than or equal to the corresponding threshold value CO2max, the dosage of the anti-carbon dioxide corrosion inhibitor = initial value * [1-(actual carbon dioxide content / CO2max)];

[0016] When the sulfate-reducing bacteria content is greater than or equal to the corresponding threshold value SRBmax, the dosage of the anti-sulfate-reducing bacteria corrosion inhibitor = initial value * [1-(sulfate-reducing bacteria content / SRBmax)]; where SRB (sulfate reducting bacteria)

[0017] When the moisture content is greater than or equal to the corresponding threshold value Wmax, the dosage = initial value * (1 + moisture content);

[0018] When the medium flow rate is greater than or equal to the corresponding threshold value Vmax, the dosage = initial value * (actual flow rate / threshold flow rate);

[0019] When the water content and medium flow rate are both greater than the threshold value max of both, the dosage = initial value * (1 + water content) * (actual flow rate / threshold flow rate).

[0020] The embodiment of the present invention provides a method for corrosion monitoring for oil and gas field stations. The present invention adopts the method of automatic monitoring of internal corrosion rate, linkage between corrosion rate and dosing control system, linkage between dosing control system and medium component detection facilities, which effectively solves the technical problem of being unable to accurately control the internal corrosion risk of equipment and pipelines in a short time, thereby achieving the goal of transferring the internal corrosion risk from post-control to pre-control, and realizing the coordinated development of corrosion data monitoring and corrosion risk control. The anti-corrosion measures of the present invention do not require production suspension and ignition, have low comprehensive costs, realize the full life cycle control of internal corrosion of oil and gas field station equipment and pipelines, and effectively improve the integrity management level of oil and gas field stations.

[0021] According to a second aspect of an embodiment of the present invention, there is provided a system for corrosion monitoring for oil and gas field stations, the system comprising a corrosion inhibitor storage tank, a corrosion monitoring data analysis and processing system, a medium flow analysis system, a corrosion inhibitor filling control system, a dosing pump, and a corrosion monitoring device;

[0022] The corrosion monitoring data analysis and processing system is electrically connected to the k corrosion monitoring devices; and obtains the corrosion rate data information of the corrosion monitoring point output by each corrosion monitoring device in real time. After analysis and processing, the corrosion monitoring data analysis and processing system obtains n process monitoring data and transmits them to the corrosion inhibitor filling control system;

[0023] The corrosion inhibitor filling control system is electrically connected to the corrosion monitoring data analysis and processing system and the medium flow analysis system respectively; the medium flow analysis system obtains detection data according to the n process detectors, analyzes the data, outputs n process monitoring data respectively, and transmits them to the corrosion inhibitor filling control system;

[0024] The corrosion inhibitor storage tank is respectively connected to the dosing pumps of the m dosing points, and the dosing pumps are electrically connected to the corrosion inhibitor filling control system signal; the dosing pumps are started according to the start signal obtained by the corrosion inhibitor filling control system;

[0025] The corrosion inhibitor storage tank is connected to the dosing pumps of the m dosing points respectively. When the m-th dosing pump is started, the corrosion inhibitor storage tank injects the m-th dosing point.

[0026] Preferably, the corrosion monitoring data analysis and processing system obtains data information of detection points of k corrosion monitoring devices, and processes the data information of the corrosion detection points, wherein the processing is to identify and convert the received data information of the corrosion detection points, and n monitoring units are set according to the requirements of the process flow, and the data information of the n monitoring units are analyzed respectively. The process flow includes oil-gas-water three-phase separation, produced water treatment, water supply and drainage, and fire protection system. After analysis and judgment, the monitoring data analysis and processing system outputs n process monitoring data, where n≥1;

[0027] Preferably, n process monitoring data information is transmitted to the corrosion inhibitor filling control system, and the corrosion inhibitor filling control system judges to start the mth corrosion inhibitor dosing pump based on the received n process monitoring data, and the corrosion inhibitor storage tank adds corrosion inhibitor to the mth corrosion inhibitor dosing point, m≥1.

[0028] Preferably, n monitoring units are set according to the requirements of the process flow, and the data information of the n monitoring units are analyzed respectively, and weighted average is performed according to the process flow monitoring units. The nth process monitoring unit feeds back the corrosion rate data of the nth unit in real time, and the unit of the corrosion rate data is mm / a;

[0029] When the corrosion rate A of the nth process monitoring unit is greater than or equal to the corrosion rate threshold Amax, the mth corrosion inhibitor dosing pump is started to add corrosion inhibitor to the mth corrosion inhibitor dosing point until the corrosion rate A is less than or equal to the corrosion rate threshold Amin, and the nth corrosion inhibitor dosing pump is stopped;

[0030] Among them, the corrosion inhibitor filling control system also receives the medium flow data information of the medium flow analysis system to detect the medium flow and component change information in the process in real time, which is used to analyze and detect n processes and output n process detection data;

[0031] The medium flow analysis system analyzes the medium flow data information and outputs the medium flow rate change, water content change, adjustment of the corrosion inhibitor filling amount, and adjustment of the corrosion inhibitor filling type and proportion.

[0032] Preferably, the medium flow data information includes hydrogen sulfide content, carbon dioxide content, sulfate-reducing bacteria content, and water content, which are obtained by a hydrogen sulfide detector, a carbon dioxide detector, a sulfate-reducing bacteria detector, and a water content analyzer, respectively;

[0033] The adjustment of the corrosion inhibitor filling type and proportion means that when the corrosion rate A is greater than or equal to the corrosion rate threshold Amax for the first time, the dosing pump is started by default to add the compound corrosion inhibitor solution, and the initial value of the dosing flow rate is 30 mg / L; the adjustment of the corrosion inhibitor filling amount is to configure the weight of the compound corrosion inhibitor solution in proportion, and the proportion is 1:1:3 of ethylenediaminetetramethylenephosphonic acid: polymaleic acid: polyepoxysuccinic acid.

[0034] Preferably, when at least two of the hydrogen sulfide content, carbon dioxide content, and sulfate-reducing bacteria content are simultaneously greater than or equal to the corresponding threshold value max, at least two corrosion inhibitors are selected for injection at the same time:

[0035] When the hydrogen sulfide content is greater than or equal to the corresponding threshold value H2Smax, the amount of hydrogen sulfide corrosion inhibitor added = initial value * [1-(actual hydrogen sulfide content / H2Smax)];

[0036] When the carbon dioxide content is greater than or equal to the corresponding threshold value CO2max, the dosage of the anti-carbon dioxide corrosion inhibitor = initial value * [1-(actual carbon dioxide content / CO2max)];

[0037] When the sulfate-reducing bacteria content is greater than or equal to the corresponding threshold value SRBmax, the dosage of the anti-sulfate-reducing bacteria corrosion inhibitor = initial value * [1-(sulfate-reducing bacteria content / SRBmax)];

[0038] When the moisture content is greater than or equal to the corresponding threshold value Wmax, the dosage = initial value * (1 + moisture content);

[0039] When the medium flow rate is greater than or equal to the corresponding threshold value Vmax, the dosage = initial value * (actual flow rate / threshold flow rate);

[0040] When the water content and medium flow rate are both greater than the threshold value max of both, the dosage = initial value * (1 + water content) * (actual flow rate / threshold flow rate).

[0041] The embodiment of the present invention provides a corrosion monitoring system for oil and gas field stations. The system of the present invention adopts the method of automatic monitoring of internal corrosion rate, linkage between corrosion rate and dosing control system, linkage between dosing control system and medium component detection facilities, which effectively solves the technical problem of being unable to accurately control the internal corrosion risk of equipment and pipelines in a short time, thereby achieving the goal of transferring the internal corrosion risk from post-control to pre-control, and realizing the coordinated development of corrosion data monitoring and corrosion risk control. The anti-corrosion measures of the present invention do not require production suspension and ignition, have low comprehensive costs, realize the full life cycle control of internal corrosion of oil and gas field station equipment and pipelines, and effectively improve the integrity management level of oil and gas field stations.

[0042] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0044] Figure 1 The present invention provides a flow chart of a corrosion monitoring method for oil and gas field stations. DETAILED DESCRIPTION

[0045] Exemplary embodiments will be described in detail herein, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present invention. Instead, they are merely examples of devices and methods consistent with some aspects of the present invention as detailed in the appended claims.

[0046] Embodiment 1

[0047] The embodiment of the present invention provides a method for monitoring corrosion in oil and gas field stations. Figure 1 As shown, according to a first aspect of an embodiment of the present invention, a method for corrosion monitoring for oil and gas field stations is provided, the method comprising:

[0048] The corrosion monitoring data analysis and processing system obtains data information of the corrosion detection points, and processes the data information of the corrosion detection points. The processing is to identify and convert the received data information of the corrosion detection points. According to the requirements of the process flow, n monitoring units are set, and the data information of the n monitoring units are analyzed respectively. After analyzing and judging, the monitoring data analysis and processing system outputs n process monitoring data, where n≥1;

[0049] The corrosion inhibitor filling control system transmits the start-up information of the mth dosing pump after receiving n process monitoring data. After the dosing pump is started, the corrosion inhibitor storage tank adds corrosion inhibitor to the mth corrosion inhibitor dosing point, where m≥1.

[0050] In one embodiment, the process flow mentioned here includes oil-gas-water three-phase separation, produced water treatment, water supply and drainage, and fire protection system. According to the requirements of the process flow, n process monitoring units are set, and the data information of the n process monitoring units are analyzed respectively. The monitoring data in the respective monitoring units of the process flows of oil-gas-water three-phase separation, produced water treatment, water supply and drainage, and fire protection system are weighted averaged. The nth process monitoring unit feeds back the corrosion rate data of the nth unit in real time, and the unit of the corrosion rate data is mm / a.

[0051] When the corrosion rate A of the nth process monitoring unit is greater than or equal to the corrosion rate threshold Amax, the mth corrosion inhibitor dosing pump is started to add corrosion inhibitor to the mth corrosion inhibitor dosing point until the corrosion rate A is less than or equal to the corrosion rate threshold Amin, and the mth corrosion inhibitor dosing pump is stopped.

[0052] The corrosion inhibitor filling control system also receives medium flow data information of medium flow and component change information in n processes detected and analyzed by the medium flow analysis system in real time, and outputs n process detection data;

[0053] The medium flow analysis system analyzes the medium flow data information and outputs medium flow rate changes, water content changes, adjustment of corrosion inhibitor filling amount, and adjustment of corrosion inhibitor filling type and proportion.

[0054] In one embodiment, the medium flow data information includes hydrogen sulfide content, carbon dioxide content, sulfate-reducing bacteria content, and water content, which are obtained by a hydrogen sulfide detector, a carbon dioxide detector, a sulfate-reducing bacteria detector, and a water content analyzer, respectively;

[0055] Among them, adjusting the type and proportion of corrosion inhibitor injection means that when the corrosion rate A is greater than or equal to the corrosion rate threshold Amax for the first time, the dosing pump is started by default to add the compound corrosion inhibitor solution, and the initial value of the dosing flow rate is 30 mg / L; the adjustment of the amount of corrosion inhibitor injection is to configure the weight of the compound corrosion inhibitor solution in proportion, and the proportion is 1:1:3 of ethylenediaminetetramethylenephosphonic acid: polymaleic acid: polyepoxysuccinic acid.

[0056] In one embodiment, when at least two of the hydrogen sulfide content, carbon dioxide content, and sulfate-reducing bacteria content are simultaneously greater than or equal to the corresponding threshold value max, at least two corrosion inhibitors are selected for injection at the same time:

[0057] When the hydrogen sulfide content is greater than or equal to the corresponding threshold value H2Smax, the amount of hydrogen sulfide corrosion inhibitor added = initial value * [1-(actual hydrogen sulfide content / H2Smax)];

[0058] When the carbon dioxide content is greater than or equal to the corresponding threshold value CO2max, the dosage of the anti-carbon dioxide corrosion inhibitor = initial value * [1-(actual carbon dioxide content / CO2max)];

[0059] When the sulfate-reducing bacteria content is greater than or equal to the corresponding threshold value SRBmax, the dosage of the anti-sulfate-reducing bacteria corrosion inhibitor = initial value * [1-(sulfate-reducing bacteria content / SRBmax)]; wherein SRB (sulfate reducting bacteria);

[0060] When the moisture content is greater than or equal to the corresponding moisture content threshold Wmax, the dosage = initial value * (1 + moisture content);

[0061] When the medium flow rate is greater than or equal to the corresponding medium flow rate threshold Vmax, the dosage = initial value * (actual flow rate / threshold flow rate);

[0062] When the water content and medium flow rate are both greater than the threshold value max of both, the dosage = initial value * (1 + water content) * (actual flow rate / threshold flow rate).

[0063] The embodiment of the present invention provides a method for corrosion monitoring for oil and gas field stations. The present invention adopts the method of automatic monitoring of internal corrosion rate, linkage between corrosion rate and dosing control system, linkage between dosing control system and medium component detection facilities, which effectively solves the technical problem of being unable to accurately control the internal corrosion risk of equipment and pipelines in a short time, thereby achieving the goal of transferring the internal corrosion risk from post-control to pre-control, and realizing the coordinated development of corrosion data monitoring and corrosion risk control. The anti-corrosion measures of the present invention do not require production suspension and ignition, have low comprehensive costs, realize the full life cycle control of internal corrosion of oil and gas field station equipment and pipelines, and effectively improve the integrity management level of oil and gas field stations.

[0064] Embodiment 2

[0065] According to a second aspect of an embodiment of the present invention, there is provided a system for corrosion monitoring for oil and gas field stations, the system comprising a corrosion inhibitor storage tank, a corrosion monitoring data analysis and processing system, a medium flow analysis system, a corrosion inhibitor filling control system, a dosing pump, and a corrosion monitoring device;

[0066] The corrosion monitoring data analysis and processing system is electrically connected to the k corrosion monitoring devices; and obtains the corrosion rate data information of the corrosion monitoring point output by each corrosion monitoring device in real time. After analysis and processing, the corrosion monitoring data analysis and processing system obtains n process monitoring data and transmits them to the corrosion inhibitor filling control system; wherein n≥1;

[0067] The corrosion inhibitor filling control system is electrically connected to the corrosion monitoring data analysis and processing system and the medium flow analysis system respectively; the medium flow analysis system obtains detection data according to the n process detectors, analyzes the data, outputs n process monitoring data respectively, and transmits them to the corrosion inhibitor filling control system;

[0068] The corrosion inhibitor storage tank is respectively connected to the dosing pumps of the m dosing points, and the dosing pumps are electrically connected to the corrosion inhibitor filling control system signal; the dosing pumps are started according to the start signal obtained by the corrosion inhibitor filling control system;

[0069] The corrosion inhibitor storage tank is connected to the dosing pumps of m dosing points respectively. When the m-th dosing pump is started, the corrosion inhibitor storage tank injects the m-th dosing point; wherein m≥1.

[0070] In one embodiment, the corrosion monitoring data analysis and processing system obtains data information of detection points of k corrosion monitoring devices, and processes the data information of the corrosion detection points, wherein the processing is to identify and convert the received data information of the corrosion detection points, and n monitoring units are set according to the requirements of the process flow, and the data information of the n monitoring units are analyzed respectively. After analysis and judgment, the monitoring data analysis and processing system outputs n process monitoring data, where n≥1;

[0071] In one embodiment, n process monitoring data information is transmitted to a corrosion inhibitor filling control system, and the corrosion inhibitor filling control system determines to start the mth corrosion inhibitor dosing pump based on the received n process monitoring data, and the corrosion inhibitor storage tank adds corrosion inhibitor to the mth corrosion inhibitor dosing point, m≥1.

[0072] In one embodiment, n monitoring units are set according to the requirements of the process flow, and the data information of the n monitoring units are analyzed respectively, and weighted average is performed according to the process flow monitoring units. The nth process monitoring unit feeds back the corrosion rate data of the nth unit in real time, and the unit of the corrosion rate data is mm / a;

[0073] When the corrosion rate A of the nth process monitoring unit is greater than or equal to the corrosion rate threshold Amax, the mth corrosion inhibitor dosing pump is started to add corrosion inhibitor to the mth corrosion inhibitor dosing point until the corrosion rate A is less than or equal to the corrosion rate threshold Amin, and the nth corrosion inhibitor dosing pump is stopped;

[0074] Among them, the corrosion inhibitor filling control system also receives the medium flow data information of the medium flow analysis system for real-time detection and analysis of the medium flow and component change information in n processes, and outputs n process detection data;

[0075] The medium flow analysis system analyzes the medium flow data information and outputs the medium flow rate change, water content change, adjustment of the corrosion inhibitor filling amount, and adjustment of the corrosion inhibitor filling type and proportion.

[0076] In one embodiment, the medium flow data information includes hydrogen sulfide content, carbon dioxide content, sulfate-reducing bacteria content, and water content, which are obtained by a hydrogen sulfide detector, a carbon dioxide detector, a sulfate-reducing bacteria detector, and a water content analyzer, respectively;

[0077] The adjustment of the corrosion inhibitor filling type and proportion means that when the corrosion rate A is greater than or equal to the corrosion rate threshold Amax for the first time, the dosing pump is started by default to add the compound corrosion inhibitor solution, and the initial value of the dosing flow rate is 30 mg / L; the adjustment of the corrosion inhibitor filling amount is to configure the weight of the compound corrosion inhibitor solution in proportion, and the proportion is 1:1:3 of ethylenediaminetetramethylenephosphonic acid: polymaleic acid: polyepoxysuccinic acid.

[0078] In one embodiment, when at least two of the hydrogen sulfide content, carbon dioxide content, and sulfate-reducing bacteria content are simultaneously greater than or equal to the corresponding threshold value max, at least two corrosion inhibitors are selected for injection at the same time:

[0079] When the hydrogen sulfide content is greater than or equal to the corresponding threshold value H2Smax, the amount of hydrogen sulfide corrosion inhibitor added = initial value * [1-(actual hydrogen sulfide content / H2Smax)];

[0080] When the carbon dioxide content is greater than or equal to the corresponding threshold value CO2max, the dosage of the anti-carbon dioxide corrosion inhibitor = initial value * [1-(actual carbon dioxide content / CO2max)];

[0081] When the sulfate-reducing bacteria content is greater than or equal to the corresponding threshold value SRBmax, the dosage of the anti-sulfate-reducing bacteria corrosion inhibitor = initial value * [1-(sulfate-reducing bacteria content / SRBmax)];

[0082] When the moisture content is greater than or equal to the corresponding threshold value Wmax, the dosage = initial value * (1 + moisture content);

[0083] When the medium flow rate is greater than or equal to the corresponding threshold value Vmax, the dosage = initial value * (actual flow rate / threshold flow rate);

[0084] When the water content and medium flow rate are both greater than the threshold value max of both, the dosage = initial value * (1 + water content) * (actual flow rate / threshold flow rate).

[0085] The embodiment of the present invention provides a corrosion monitoring system for oil and gas field stations. The system of the present invention adopts the method of automatic monitoring of internal corrosion rate, linkage between corrosion rate and dosing control system, linkage between dosing control system and medium component detection facilities, which effectively solves the technical problem of being unable to accurately control the internal corrosion risk of equipment and pipelines in a short time, thereby achieving the goal of transferring the internal corrosion risk from post-control to pre-control, and realizing the coordinated development of corrosion data monitoring and corrosion risk control. The anti-corrosion measures of the present invention do not require production suspension and ignition, have low comprehensive costs, realize the full life cycle control of internal corrosion of oil and gas field station equipment and pipelines, and effectively improve the integrity management level of oil and gas field stations.

[0086] A corrosion monitoring system for oil and gas field stations described in the embodiment corresponding to the above embodiment 2 Figure 1 , the following is an embodiment of the system of the present invention.

[0087] Embodiment 3

[0088] In one implementation, the present invention provides a system for monitoring corrosion in oil and gas field stations. Based on the content of the second embodiment, the following is combined with the application scenario and the attached Figure 1 The present invention is further described with reference to the specific embodiments, but the protection scope of the present invention is not limited thereto.

[0089] In one embodiment, an embodiment of the present invention provides a corrosion monitoring system for oil and gas field stations, including a corrosion inhibitor storage tank level detector, a corrosion inhibitor storage tank, a corrosion monitoring data analysis and processing system, a medium flow analysis system, a corrosion inhibitor filling control system, a dosing pump, a corrosion monitoring device, and a process analysis and detection equipment.

[0090] The liquid level detector of the corrosion inhibitor storage tank is used to detect the minimum amount of corrosion inhibitor. When the liquid level of the corrosion inhibitor is lower than 100mm, the liquid level system alarms to remind personnel to replenish the corresponding corrosion inhibitor solution.

[0091] The corrosion inhibitor storage tank is connected to the dosing pump of each dosing point respectively. The corrosion inhibitor storage tank stores the compound corrosion inhibitor solution of ethylenediaminetetramethylenephosphonic acid + polymaleic acid + polyepoxysuccinic acid in a weight ratio (1:1:3), anti-hydrogen sulfide corrosion inhibitor, and anti-carbon dioxide corrosion inhibitor; the dosing pump is electrically connected to the corrosion inhibitor filling control system signal (the connection can be wireless or wired).

[0092] The corrosion inhibitor filling control system is connected to the corrosion monitoring data analysis and processing system and the medium flow analysis system. The corrosion monitoring data analysis and processing system is connected to the detection device of each corrosion monitoring point by signal; the corrosion monitoring device is connected to the process pipeline or equipment through openings, clamps, external spot welding probes, etc.; the corrosion monitoring device includes a resistance probe, a cock, and data storage and upload facilities;

[0093] The corrosion monitoring data analysis and processing system realizes the weighted average of the monitoring data in each process, and then feeds back the average corrosion rate of each process to the control system. The medium analysis system includes a flow meter, a hydrogen sulfide detector, a carbon dioxide detector, a moisture content analyzer, and a sulfate-reducing bacteria detector. The medium analysis system is connected to the control system signal.

[0094] In one embodiment, taking a joint station as an example, the process flow system of the joint station generally includes: an inlet valve group area (determined as process one), a three-phase separation area (determined as process two), a produced water treatment area (determined as process three), an external transmission valve group area (determined as process four), a fire protection system (determined as process five), and a heating system (determined as process six). 2-5 corrosion monitoring points are set in each process, and each monitoring point is equipped with a wired or wireless resistance probe corrosion monitoring device, and the monitored corrosion rate data is uploaded to the corrosion monitoring data analysis and processing system; 1-2 detection points for medium analysis are set in each process, and the main corrosion factors of the medium (such as water content, hydrogen sulfide content, carbon dioxide content, sulfate-reducing bacteria content, etc.) are detected regularly or in real time, and the detection data are fed back to the corrosion inhibitor filling control system regularly or in real time; 1-2 dosing points are set in each process, and the corrosion inhibitor filling control system controls or adjusts the type and amount of dosing.

[0095] Channel 1-Channel 3 are respectively connected to a dosing pump in the corresponding oil-gas-water three-phase separation, produced water treatment, and water supply and drainage process units. The channel is used to transmit startup information to facilitate dosing at each dosing point. The channel can be understood as a wired connection or a wireless connection.

[0096] The embodiment of the present invention provides a corrosion monitoring system for oil and gas field stations. The system of the present invention adopts the method of automatic monitoring of internal corrosion rate, linkage between corrosion rate and dosing control system, linkage between dosing control system and medium component detection facilities, which effectively solves the technical problem of being unable to accurately control the internal corrosion risk of equipment and pipelines in a short time, thereby achieving the goal of transferring the internal corrosion risk from post-control to pre-control, and realizing the coordinated development of corrosion data monitoring and corrosion risk control. The anti-corrosion measures of the present invention do not require production suspension and ignition, have low comprehensive costs, realize the full life cycle control of internal corrosion of oil and gas field station equipment and pipelines, and effectively improve the integrity management level of oil and gas field stations; realize the linkage between corrosion monitoring data and the implementation of anti-corrosion measures, and can effectively control high-risk corrosion links in a short time without affecting the normal production process.

Claims

1. A method for corrosion monitoring at an oil and gas field station, characterized in that: The method comprises: a corrosion monitoring data analysis and processing system obtains data information of a corrosion detection point, and processes the data information of the corrosion detection point, wherein the processing is to identify and convert the received data information of the corrosion detection point, and n process monitoring units are set according to the requirements of the process flow, and the data information of the n process monitoring units are analyzed respectively, and the corrosion monitoring data analysis and processing system outputs n process monitoring data after analysis and judgment, where n≥1; The n process monitoring data information is transmitted to the corrosion inhibitor filling control system, and the corrosion inhibitor filling control system transmits the mth dosing pump start information after receiving the n process monitoring data and judging. After the dosing pump is started, the corrosion inhibitor storage tank adds corrosion inhibitor to the mth corrosion inhibitor dosing point, where m≥1; The corrosion inhibitor filling control system also receives medium flow data information of medium flow and component change information in n processes detected and analyzed by the medium flow analysis system in real time, detects and analyzes n processes and outputs n process detection data; The medium flow analysis system analyzes the medium flow data information and outputs medium flow rate changes, water content changes, adjustment of corrosion inhibitor filling amount, and adjustment of corrosion inhibitor filling type and proportion; The medium flow data information includes hydrogen sulfide content, carbon dioxide content, sulfate-reducing bacteria content, and water content, which are obtained by a hydrogen sulfide detector, a carbon dioxide detector, a sulfate-reducing bacteria detector, and a water content analyzer, respectively; The adjustment of the corrosion inhibitor filling type and proportion means that when the corrosion rate A is greater than or equal to the corrosion rate threshold Amax for the first time, the dosing pump is started by default to add the compound corrosion inhibitor solution, and the initial value of the dosing amount is 30 mg / L; the adjustment of the corrosion inhibitor filling amount is to configure the weight of the compound corrosion inhibitor solution in proportion, and the proportion is 1:1:3 of ethylenediaminetetramethylenephosphonic acid: polymaleic acid: polyepoxysuccinic acid.

2. The method for corrosion monitoring at an oil and gas field station according to claim 1, characterized in that: The process flow includes oil-gas-water three-phase separation, produced water treatment, water supply and drainage, and fire protection system. According to the requirements of the process flow, n process monitoring units are set, and the data information of the n process monitoring units are analyzed respectively. The monitoring data in the respective monitoring units of the process flow of oil-gas-water three-phase separation, produced water treatment, water supply and drainage, and fire protection system are weighted averaged. The nth process monitoring unit feeds back the corrosion rate data of the nth unit in real time, and the unit of the corrosion rate data is mm / a. When the corrosion rate of the nth process monitoring unit is greater than or equal to the corrosion rate threshold Amax, the mth corrosion inhibitor dosing pump is started to add corrosion inhibitor to the mth corrosion inhibitor dosing point until the corrosion rate A is less than or equal to the corrosion rate threshold Amin, and the mth corrosion inhibitor dosing pump is stopped.

3. The method for corrosion monitoring at an oil and gas field station according to claim 1, characterized in that: When the moisture content is greater than or equal to the corresponding threshold value Wmax, the dosage = initial value * (1 + moisture content); When the medium flow rate is greater than or equal to the corresponding threshold value Vmax, the dosage = initial value * (actual flow rate / threshold flow rate); When the water content and medium flow rate are both greater than the threshold value max of both, the dosage = initial value * (1 + water content) * (actual flow rate / threshold flow rate).

4. A corrosion monitoring system for oil and gas field stations, characterized in that: The system includes a corrosion inhibitor storage tank, a corrosion monitoring data analysis and processing system, a medium flow analysis system, a corrosion inhibitor filling control system, a dosing pump, and a corrosion monitoring device; The corrosion monitoring data analysis and processing system is electrically connected to k corrosion monitoring devices; and obtains the corrosion rate data information of the corrosion monitoring point output by each corrosion monitoring device in real time. After analysis and processing, the corrosion monitoring data analysis and processing system obtains n process monitoring data and transmits them to the corrosion inhibitor filling control system; wherein n≥1; The corrosion inhibitor filling control system is electrically connected to the corrosion monitoring data analysis and processing system and the medium flow analysis system respectively; the medium flow analysis system obtains detection data according to n process detectors, analyzes the data, outputs n process monitoring data respectively, and transmits them to the corrosion inhibitor filling control system; The corrosion inhibitor storage tank is respectively connected to the dosing pumps of the m dosing points, and the dosing pumps are electrically connected to the corrosion inhibitor filling control system signal; the dosing pumps are started according to the start signal obtained by the corrosion inhibitor filling control system; The corrosion inhibitor storage tank is connected to the dosing pumps of m dosing points respectively, and when the mth dosing pump is started, the corrosion inhibitor storage tank injects the mth dosing point; wherein m≥1; The corrosion monitoring data analysis and processing system obtains data information of detection points of k corrosion monitoring devices, and processes the data information of the corrosion detection points. The processing is to identify and convert the received data information of the corrosion detection points, set n monitoring units according to the requirements of the process flow, and analyze the data information of the n monitoring units respectively. The process flow includes oil-gas-water three-phase separation, produced water treatment, water supply and drainage, and fire protection system. The monitoring data analysis and processing system outputs n process monitoring data after analysis and judgment, where n≥1; The n process monitoring data information is transmitted to the corrosion inhibitor filling control system, and the corrosion inhibitor filling control system judges to start the mth corrosion inhibitor dosing pump according to the received n process monitoring data, and the corrosion inhibitor storage tank adds corrosion inhibitor to the mth corrosion inhibitor dosing point, m≥1; According to the requirements of the process flow, n monitoring units are set, and the data information of the n monitoring units are analyzed respectively, and weighted average is performed according to the process flow monitoring units. The nth process monitoring unit feeds back the corrosion rate data of the nth unit in real time, and the unit of the corrosion rate data is mm / a; When the corrosion rate A of the nth process monitoring unit is greater than or equal to the corrosion rate threshold Amax, the mth corrosion inhibitor dosing pump is started to add corrosion inhibitor to the mth corrosion inhibitor dosing point until the corrosion rate A is less than or equal to the corrosion rate threshold Amin, and the mth corrosion inhibitor dosing pump is stopped; The corrosion inhibitor filling control system also receives medium flow data information of medium flow and component change information in n processes detected and analyzed in real time by the medium flow analysis system, and outputs n process detection data; The medium flow analysis system analyzes the medium flow data information and outputs medium flow rate changes, water content changes, adjustment of corrosion inhibitor filling amount, and adjustment of corrosion inhibitor filling type and proportion; The medium flow data information includes hydrogen sulfide content, carbon dioxide content, sulfate-reducing bacteria content, and water content, which are obtained by a hydrogen sulfide detector, a carbon dioxide detector, a sulfate-reducing bacteria detector, and a water content analyzer, respectively; The adjustment of the corrosion inhibitor filling type and proportion means that when the corrosion rate A is greater than or equal to the corrosion rate threshold Amax for the first time, the dosing pump is started by default to add the compound corrosion inhibitor solution, and the initial value of the dosing flow rate is 30 mg / L; the adjustment of the corrosion inhibitor filling amount is to configure the weight of the compound corrosion inhibitor solution in proportion, and the proportion is 1:1:3 of ethylenediaminetetramethylenephosphonic acid: polymaleic acid: polyepoxysuccinic acid.

5. The corrosion monitoring system for oil and gas field stations according to claim 4 is characterized in that: When the moisture content is greater than or equal to the corresponding threshold value Wmax, the dosage = initial value * (1 + moisture content); When the medium flow rate is greater than or equal to the corresponding threshold value Vmax, the dosage = initial value * (actual flow rate / threshold flow rate); When the water content and medium flow rate are both greater than the threshold value max of both, the dosage = initial value * (1 + water content) * (actual flow rate / threshold flow rate).

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