Corrosion inhibitor dynamic experiment evaluation method and system and readable storage medium

Abstract

The invention relates to the technical field of corrosion inhibitor evaluation, and discloses a corrosion inhibitor dynamic experiment evaluation method and system and a readable storage medium. In the dynamic experimental evaluation method of the corrosion inhibitor, the field temperature is simulated; the first circulation loop is controlled, and a corrosion inhibitor-free test is carried out according to the required test period; the corrosion inhibitor intelligent filling control unit is controlled to fill the corrosion inhibitor with the set concentration into the raw material tank; and the second circulation loop is controlled, and a corrosion inhibitor adding test is carried out according to the required test period. In the corrosion inhibitor dynamic experiment evaluation system, a raw material tank is used for accommodating a corrosion medium; the evaluation device is connected with the raw material tank; the evaluation device is used for installing evaluation samples; the intelligent corrosion inhibitor filling control unit is connected with the raw material tank and is used for filling a corrosion inhibitor into the raw material tank; the monitoring unit is used for monitoring the evaluation sample. According to the technical scheme provided by the invention, the corrosion rate and the corrosion inhibition rate are monitored in real time for evaluation by utilizing the flow of the corrosion medium in the pipeline under the field working condition, so that the field corrosion inhibitor is more directly evaluated.

Description

Technical Field

[0001] The present invention relates to the technical field of corrosion inhibitor evaluation, and in particular to a corrosion inhibitor dynamic experimental evaluation method, system and readable storage medium. Background Art

[0002] With the continuous expansion of oil and gas field mining, transportation, refining and chemical industries, various corrosion and eventual damage problems have emerged in pipeline systems. Methods to prevent pipeline corrosion include adding corrosion inhibitors, applying anti-corrosion paint, installing linings and upgrading materials. Among them, adding corrosion inhibitors is an economical and convenient method; therefore, this method is preferred by all industries. However, depending on the type of corrosive media in the industry, the selected corrosion inhibitors are also different. However, the effectiveness of the corrosion inhibitor and the optimal concentration point of the corrosion inhibitor need to be evaluated through simulation tests based on the on-site operating parameters.

[0003] In the existing technology, the most basic evaluation method in the laboratory is the test piece immersion weight loss method. The existing laboratory equipment basically adopts the dynamics of hanging pieces, and the fluid passively induces the dynamics, which is not a flow state and fails to fully simulate the on-site working conditions; and the evaluation of corrosion inhibitors needs to be carried out as completely as possible based on the on-site conditions. It can be seen that the existing equipment cannot fully simulate the on-site working conditions, and the existing technology has shortcomings. Summary of the invention

[0004] The present invention provides a corrosion inhibitor dynamic experimental evaluation method, system and readable storage medium to solve the above-mentioned technical problem that the prior art cannot fully simulate on-site working conditions.

[0005] According to a first aspect of the present invention, an embodiment provides a corrosion inhibitor dynamic experimental evaluation method, comprising the following steps:

[0006] S1. Control and heat the on-site or simulated prepared oilfield produced water contained in the raw material tank to simulate the on-site temperature;

[0007] S2. Control the material in the raw material tank to bypass the first evaluation device and flow through the second evaluation device and then flow into the raw material tank to form a first circulation loop, and perform the test without adding the corrosion inhibitor according to the required test cycle; wherein the second evaluation device is provided with a plurality of evaluation samples;

[0008] S3. Control the corrosion inhibitor intelligent filling control unit to add a set concentration of corrosion inhibitor to the raw material tank;

[0009] S4. Control the corrosion inhibitor contained in the heating raw material tank, the oil field produced water prepared on site or in simulation, and simulate the on-site temperature;

[0010] S5. Control the material in the raw material tank to flow through the first evaluation device and bypass the second evaluation device and then flow into the raw material tank to form a second circulation loop, and perform a corrosion inhibitor addition test according to the required test cycle; wherein the first evaluation device is provided with a plurality of evaluation samples;

[0011] Wherein, an ultrasonic thickness sensor is used to measure the wall thickness of the evaluation samples in the first evaluation device and the second evaluation device in real time.

[0012] Preferably, in the corrosion inhibitor dynamic experimental evaluation method, the pressure and flow rate of the material in the first circulation loop in step S2 are controlled to simulate the on-site pressure and flow rate conditions; and / or

[0013] In the corrosion inhibitor dynamic experimental evaluation method, the pressure and flow rate of the material in the second circulation loop in step S5 are controlled to simulate the on-site pressure and flow rate conditions.

[0014] Preferably, the corrosion inhibitor dynamic experimental evaluation method comprises the following steps:

[0015] S01. Before step S2, a blank test is performed on the ultrasonic thickness measurement of the evaluation sample in the second evaluation device; and / or

[0016] S02. Before step S5, a blank test is performed on the ultrasonic thickness measurement of the evaluation sample in the first evaluation device; and / or

[0017] S6. Repeat steps S1-S5 according to the corrosion inhibitor concentration gradient designed in the experimental plan.

[0018] According to a second aspect of the present invention, an embodiment provides a corrosion inhibitor dynamic experimental evaluation system, comprising:

[0019] Raw material tank, used to contain corrosive media;

[0020] An evaluation device connected to the raw material tank; the evaluation device is used to install the evaluation sample;

[0021] A corrosion inhibitor intelligent filling control unit, connected to the raw material tank and used to fill the corrosion inhibitor into the raw material tank; and

[0022] A monitoring unit is used to monitor the evaluation sample.

[0023] Preferably, the evaluation device comprises: a first evaluation device; and

[0024] a second evaluation device connected in series with the first evaluation device;

[0025] Wherein, in the first evaluation device and the second evaluation device, the evaluation samples are provided in plurality, and each of the evaluation samples is set as a tubular sample made of the same material as that on site.

[0026] Preferably, both the first evaluation device and the second evaluation device are provided with connecting and fixing rings; the connecting and fixing rings are arranged in pairs, and a connecting and fixing ring in a pair is used to fix an evaluation sample; each connecting and fixing ring is connected to the pipeline of the corrosion inhibitor dynamic experimental evaluation system.

[0027] Preferably, a circulation pump is arranged between the raw material tank and the first evaluation device, two paths are arranged between the circulation pump and the first evaluation device, one path is connected to the first evaluation device, and the other path is connected in parallel with the first evaluation device, each path uses a valve to control the flow of the medium, and a flow control valve is arranged at the front end of each evaluation sample connected to the first evaluation device; and / or

[0028] The first evaluation device has two paths at the rear end, one connected to the second evaluation device and the other connected in parallel with the second evaluation device. Each path uses a valve to control the flow of the medium, and a flow control valve is set at the front end of each evaluation sample connected to the second evaluation device.

[0029] Preferably, in the corrosion inhibitor dynamic experimental evaluation system, the monitoring unit comprises:

[0030] an ultrasonic thickness sensor, disposed on the upper part and / or the lower part of each evaluation sample; and

[0031] A server connected to the ultrasonic thickness sensor, wherein the server supports remote control;

[0032] Wherein, the server is used to control the ultrasonic thickness sensor to measure the wall thickness of the evaluation sample in real time according to the test cycle, and output the data to the computer; and / or

[0033] In the corrosion inhibitor dynamic experimental evaluation system, the corrosion inhibitor intelligent filling control unit includes:

[0034] Corrosion inhibitor storage tanks; and

[0035] An electric submersible pump is connected to the corrosion inhibitor storage tank; an outlet of the electric submersible pump is connected to a raw material tank, and the electric submersible pump is sequentially connected to a remote controller and the computer.

[0036] Preferably, the raw material tank is provided with a heating device and / or a pressure relief valve; the heating device is connected to a time controller and / or a temperature controller.

[0037] According to a third aspect of the present invention, a readable storage medium is provided, on which computer instructions are stored; wherein when the computer instructions are executed by a processor, any of the methods described above is implemented.

[0038] Existing coupon test evaluation devices all use coupons to dynamically induce corrosive media to simulate flow corrosion. The technical solution of the present invention uses the flow of corrosive media in the pipeline under on-site working conditions to monitor the corrosion rate and corrosion inhibition rate in real time to conduct evaluation tests, thereby more directly evaluating on-site corrosion inhibitors.

[0039] The technical solution of the present invention completely simulates the corrosion of the medium flowing in the pipeline system, and the corrosion rate and the corrosion inhibition rate of the corrosion inhibitor can be calculated based on the thickness measurement result of the ultrasonic thickness measurement real-time monitoring unit.

[0040] In addition, the technical solution of the present invention can achieve a comprehensive simulation of pipeline corrosion conditions under field working conditions by adjusting the temperature and flow rate of the corrosive medium at will, thereby obtaining more accurate test results.

[0041] Specific:

[0042] (1) The temperature-adjusting heating device can simulate the actual on-site temperature conditions, and the circulation (boosting) pump and flow control valve can simulate the on-site pressure and flow rate conditions;

[0043] (2) The evaluation specimen is a tubular specimen, which can fully simulate the corrosion dynamics in the on-site fluid flow pipeline and obtain more accurate test results;

[0044] (3) The pipe material used is transparent and visible, so the flow and fault conditions in the test system can be observed;

[0045] (4) The amount of corrosion inhibitor added can be adjusted through remote real-time monitoring of corrosion rate and corrosion inhibition rate data to obtain the optimal concentration of the corresponding corrosion inhibitor for oilfield produced water, and then select the most suitable corrosion inhibitor for a specific environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] Figure 1 is a schematic flow chart of a corrosion inhibitor dynamic experimental evaluation method in an embodiment;

[0047] Figure 2 is another schematic flow chart of a corrosion inhibitor dynamic experimental evaluation method in an embodiment;

[0048] Figure 3 is a structural schematic diagram of a corrosion inhibitor dynamic experimental evaluation system in an embodiment;

[0049] Figure 4 The present invention is a schematic diagram of thickness measurement control of a corrosion inhibitor dynamic experimental evaluation system in an embodiment.

[0050] Reference numerals:

[0051] 1-raw material tank; 2-pressure relief valve; 3-first evaluation device; 4-second evaluation device; 5-circulation pump; 6-medium circulation pipe; 7-computer; 8-first ultrasonic thickness sensor; 9-second ultrasonic thickness sensor; 10-server; 11-time control knob; 12-temperature control knob; 13-first stop valve; 14-second stop valve; 15-third stop valve; 16-fourth stop valve; 17-fourth flow control valve; 18-fifth flow control valve; 19-sixth flow control valve; 20-first flow control valve; 21-second flow control valve; 22-third flow control valve; 23-corrosion inhibitor storage tank; 24-level meter; 25-submersible pump; 26-remote controller. DETAILED DESCRIPTION

[0052] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0053] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiment of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiment of the present invention. Obviously, the described embodiment is only an embodiment of a part of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work should fall within the scope of protection of the present invention.

[0054] It should be noted that the terms "first", "second", etc. in the present invention are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0055] It should be understood that when an element (such as a layer, film, region, or substrate) is described as being "on" another element, the element may be directly on the other element, or there may be an intermediate element. Moreover, in the present invention, when an element is described as being "connected" to another element, the element may be "directly connected" to the other element, or "connected" to the other element through a third element.

[0056] Embodiment 1

[0057] Please refer to Figure 1-Figure 4This embodiment provides a corrosion inhibitor dynamic experimental evaluation method, comprising the following steps:

[0058] S1. Control the heating of the raw material tank 1 containing the field or simulated preparation of oil field produced water, simulated field temperature;

[0059] S2. Control the material in the raw material tank 1 to bypass the first evaluation device 3 and flow through the second evaluation device 4 and then flow into the raw material tank 1 to form a first circulation loop, and perform a test without adding a corrosion inhibitor according to the required test cycle; wherein, the second evaluation device 4 is provided with a plurality of evaluation samples; in the test without adding a corrosion inhibitor, control the pressure and flow rate of the material in the first circulation loop to simulate the pressure and flow rate conditions on site;

[0060] S3. Control the corrosion inhibitor intelligent filling control unit to add a set concentration of corrosion inhibitor to the raw material tank 1;

[0061] S4. Control the corrosion inhibitor contained in the heating raw material tank 1, the oil field produced water prepared on site or simulated, and simulate the on-site temperature;

[0062] S5. Control the material in the raw material tank 1 to flow through the first evaluation device 3 and bypass the second evaluation device 4 to flow into the raw material tank 1 to form a second circulation loop, and perform a corrosion inhibitor addition test according to the required test cycle; wherein the first evaluation device 3 is provided with a plurality of evaluation samples; in the corrosion inhibitor addition test, control the pressure and flow rate of the material in the second circulation loop to simulate the on-site pressure and flow rate conditions;

[0063] S6. Repeat steps S1-S5 according to the corrosion inhibitor concentration gradient designed in the experimental scheme;

[0064] The ultrasonic thickness sensor is used to measure the wall thickness of the evaluation samples in the first evaluation device 3 and the second evaluation device 4 in real time.

[0065] In one embodiment, a blank experiment is set in the corrosion inhibitor dynamic experimental evaluation method, which is an important part of the experimental design and aims to improve the accuracy and reliability of the experimental results. Figure 2 As shown, the following steps are included:

[0066] S01. Before step S2, a blank test is performed on the ultrasonic thickness measurement of the evaluation sample in the second evaluation device 4;

[0067] Similarly, before step S5, a blank test is performed on the evaluation sample in the first evaluation device 3 by ultrasonic thickness measurement; this is step S02.

[0068] The corrosion inhibitor dynamic experimental evaluation method of the present invention is implemented by using the following corrosion inhibitor dynamic experimental evaluation system.

[0069] like Figure 3 , Figure 4 As shown, the corrosion inhibitor dynamic experiment evaluation system includes: a raw material tank 1, a corrosion inhibitor intelligent filling control unit, an evaluation device and a monitoring unit. The pipeline of the corrosion inhibitor dynamic experiment evaluation system is a medium flow pipe 6, which is used for material transportation; a circulation pump 5 is arranged on the medium flow pipe 6 to circulate and circulate the corrosive medium. Among them, the raw material tank 1 is used to contain the corrosive medium; the evaluation device is used to install the evaluation sample, and the evaluation device includes a first evaluation device 3 and a second evaluation device 4; the monitoring unit is used to display the monitoring evaluation sample in real time.

[0070] The raw material tank 1 is provided with a time control knob 11 and a temperature control knob 12, which are part of the controller. The raw material tank 1 is provided with an outlet hole and an inlet hole, both of which are connected to a medium flow pipe 6, and a pressure relief valve 2 is provided on the raw material tank 1.

[0071] The corrosive medium in the raw material tank 1 flows into the first evaluation device 3 and the second evaluation device 4 through a circulation (boosting) pump. There are two routes between the circulation pump 5 and the first evaluation device 3, and each route uses a stop valve (i.e., the first stop valve 13 and the second stop valve 14) to control the medium flow; a flow control valve (i.e., the first flow control valve 20, the second flow control valve 21 and the third flow control valve 22) is set before each evaluation sample connected to the first evaluation device 3. The pipeline after the second evaluation device 4 is divided into two routes, and each route uses a stop valve (i.e., the third stop valve 15 and the fourth stop valve 16) to control the medium flow, and a flow control valve (i.e., the fourth flow control valve 17, the fifth flow control valve 18 and the sixth flow control valve 19) is set before each sample connected to the fourth evaluation device.

[0072] The evaluation samples in the first evaluation device 3 are set to average three samples, and the evaluation samples in the second evaluation device 4 are set to average three samples. Among them, each evaluation sample is set to be a tubular sample of the same material as the on-site, and both sides of each evaluation sample are connected with a connecting fixing ring that matches the four-way connection to achieve a sealed connection between the evaluation sample and the medium flow pipe 6.

[0073] Ultrasonic thickness sensors are installed on the upper and lower parts of each evaluation sample. The ultrasonic thickness sensors are connected to the server 10 supporting remote data via wired or wireless communication, and can display data in real time on the computer 7, and measure the wall thickness of the evaluation sample in real time according to the test cycle.

[0074] The corrosion inhibitor intelligent filling control unit comprises: a corrosion inhibitor storage tank 23, an electric submersible pump 25, a remote controller 26 and a computer 7. The computer 7 is connected to the remote controller 26 (the remote controller 26 comprises a remote flow controller and a remote time controller) by wire or wireless, and the computer 7 instructs / controls the remote flow controller and the remote time controller to start and stop the electric submersible pump 25 within a fixed time, thereby controlling the operation of the electric submersible pump 25. In addition, a liquid level meter 24 is installed outside the corrosion inhibitor storage tank 23.

[0075] Embodiment 2

[0076] Please refer to Figure 1-Figure 4 This embodiment provides a corrosion inhibitor dynamic experimental evaluation system, including the following structures: a raw material tank 1 is used to contain corrosive media; an evaluation device is connected to the raw material tank 1; the evaluation device is used to install an evaluation sample; a corrosion inhibitor intelligent filling control unit is connected to the raw material tank 1 and is used to fill the corrosion inhibitor into the raw material tank 1; a monitoring unit is used to monitor the evaluation sample.

[0077] In one embodiment, in the corrosion inhibitor dynamic experimental evaluation system, the material of the pipe / pipeline used for medium transportation (i.e., the medium flow pipe 6 in Example 1) is set to acrylic (glass). In one example, the raw material tank 1 contains on-site or simulated oil field produced water, and the raw material tank 1 is provided with a heating device and / or a pressure relief valve 2. The raw material tank 1 is preferably made of stainless steel or high-temperature resistant glass material. The heating device is connected to a time controller and / or a temperature controller. The temperature controller includes a temperature control knob 12 for controlling the heating temperature of the raw material tank 1 and the material therein; the time controller includes a time control knob 11 for controlling the test time, i.e., the heating time / insulation time.

[0078] In one embodiment, the evaluation device includes: a first evaluation device 3 and a second evaluation device 4; the second evaluation device 4 is connected in series with the first evaluation device 3. In the first evaluation device 3 and the second evaluation device 4, the evaluation samples are provided in multiple pieces, and each evaluation sample is provided as a tubular sample of the same material as that on site. Preferably, the evaluation samples are provided in three pieces.

[0079] In one embodiment, the first evaluation device 3 and the second evaluation device 4 are both provided with connecting and fixing rings; the connecting and fixing rings are arranged in pairs, and a pair of the connecting and fixing rings is used to fix an evaluation sample; each of the connecting and fixing rings is connected to the pipeline of the corrosion inhibitor dynamic experimental evaluation system. The evaluation samples are preferably provided in three pieces, and connecting and fixing rings are arranged at both ends of each evaluation sample. Among them, a connecting and fixing ring is connected to a passage of a four-way (three evaluation samples require three passages, and the main passage of the four-way is connected to the pipeline to separately transport the materials to the three passages and the three evaluation samples connected thereto), the connecting and fixing rings are arranged in pairs, and the four-way is also arranged in pairs.

[0080] In one embodiment, the evaluation sample is made of the same metal material as the one on site, and is made into a tubular shape with the same diameter as the medium flow pipe 6, and threads are turned at both ends to match the fixed flange in the evaluation device. Furthermore, the evaluation sample is a tubular sample, which reduces the time for grinding the sample, and only the inside of the sample needs to be ground.

[0081] In one embodiment, a circulation pump 5 is arranged between the raw material tank 1 and the first evaluation device 3, and two routes are arranged between the circulation pump 5 and the first evaluation device 3, one route is connected to the first evaluation device 3, and the other route is connected in parallel with the first evaluation device 3, each route uses a valve (the valve is preferably a stop valve, further set as a first stop valve 13 and a second stop valve 14) to control the flow of the medium, and a flow control valve (i.e., a first flow control valve 20, a second flow control valve 21 and a third flow control valve 22) is arranged at the front end of each evaluation sample connected to the first evaluation device 3.

[0082] The same is true for the design of the first evaluation device 3 being divided into two routes. In one embodiment, the rear end of the first evaluation device 3 is provided with two routes, one route is connected to the second evaluation device 4, and the other route is connected in parallel with the second evaluation device 4. Each route uses a valve (preferably a stop valve, further set as a third stop valve 15 and a fourth stop valve 16) to control the flow of the medium, and a flow control valve (i.e., a fourth flow control valve 17, a fifth flow control valve 18, and a sixth flow control valve 19) is set at the front end of each evaluation sample connected to the second evaluation device 4.

[0083] like Figure 4 In one embodiment shown, in the corrosion inhibitor dynamic experimental evaluation system, the monitoring unit includes: an ultrasonic thickness sensor and a remote-supported server 10. The ultrasonic thickness sensor is arranged on the upper and / or lower part of each evaluation sample; the server 10 is connected to the ultrasonic thickness sensor, wherein the server 10 is used to control the ultrasonic thickness sensor to measure the wall thickness of the evaluation sample in real time according to the test cycle, and output the data to the computer 7 for real-time display. Furthermore, three parallel samples are used for the evaluation samples, and a thickness measurement point is set at the upper and lower parts of the sample during ultrasonic thickness measurement, and the average value is calculated with the final thickness measurement data.

[0084] In one embodiment, in the corrosion inhibitor dynamic experimental evaluation system, the corrosion inhibitor intelligent filling control unit includes: a corrosion inhibitor storage tank 23 and an electric submersible pump 25. The electric submersible pump 25 is connected to the corrosion inhibitor storage tank 23; the outlet of the electric submersible pump 25 is connected to the raw material tank 1, and the electric submersible pump 25 is connected to the remote controller 26 and the computer 7 in sequence. A liquid level meter 24 is preferably installed on the outside of the corrosion inhibitor storage tank to observe the liquid level in the tank. Furthermore, the remote time controller and the remote flow controller are connected to the computer 7 by wire or wireless to receive control signals, and use the above control signals to control the (high-voltage) electric submersible pump 25 to start or stop at the set time and flow rate.

[0085] In one embodiment, the ultrasonic thickness sensor is connected to the server 10 supporting remote data and the computer 7 via wired or wireless connection. In one example of wireless connection, the first ultrasonic thickness sensor 8 installed on the upper part of the evaluation sample and the second ultrasonic thickness sensor 9 installed on the lower part are connected to the 4G module via a connecting line, a power supply is provided to power the first ultrasonic thickness sensor 8, the second ultrasonic thickness sensor 9 and the 4G module, the 4G module wirelessly communicates with the server 10, and the server 10 is connected to the computer 7.

[0086] A corrosion inhibitor dynamic experimental evaluation method based on the above corrosion inhibitor dynamic experimental evaluation system adopts the following steps: Figure 1 , Figure 2 shown.

[0087] Test without corrosion inhibitor:

[0088] Close the second stop valve 14 of the first evaluation device 3 and the third stop valve 15 of the side of the second evaluation device 4, open the first stop valve 13 of the side of the first evaluation device 3, the fourth stop valve 16 of the second evaluation device 4, the fourth flow control valve 17, the fifth flow control valve 18, and the sixth flow control valve 19 (before the test, the three evaluation sample tubes of the second evaluation device 4 are ultrasonically measured and recorded), and ultrasonic thickness sensors are installed on the upper and lower parts of the three evaluation sample tubes of the second evaluation device 4 and the three evaluation samples of the first evaluation device 3, and are successfully connected with the remote controller 26, the (remote) server 10, and the (control) computer 7, and then the circulation pump 5 is turned on, and the corrosive medium flows through the side of the first evaluation device 3 through the medium flow pipe 6 (close the second stop valve 14 and the third stop valve 15, open the first stop valve 13), and then flows into the raw material tank 1 through the second evaluation device 4, that is, a circulation loop is formed. The test is carried out according to the required test cycle.

[0089] Test with a certain concentration of corrosion inhibitor:

[0090] According to the corrosion inhibitor concentration designed in the test plan, the remote controller 26 is set through the computer 7 to operate the electric submersible pump 25 to add the corrosion inhibitor to the raw material tank 1.

[0091] The raw material tank 1 is filled with on-site or simulated oilfield produced water, mixed with the added corrosion inhibitor, and the temperature control knob 12 is operated to set the temperature controller to control heating to the required temperature, and the time controller controls the setting of the test time. The first stop valve 13 of the side of the first evaluation device 3, the fourth stop valve 16 of the second evaluation device 4, the fourth flow control valve 17, the fifth flow control valve 18, and the sixth flow control valve 19 are closed, and the second stop valve 14, the first flow control valve 20, the second flow control valve 21, the third flow control valve 22 of the first evaluation device 3, and the third stop valve 15 of the side of the second evaluation device 4 are opened (the three evaluation sample tubes of the second evaluation device 4 are ultrasonically measured and recorded before the test). Ultrasonic thickness sensors are installed on the upper and lower parts of the three evaluation sample tubes of the second evaluation device 4 and the three evaluation samples of the first evaluation device 3, and are successfully connected with the remote controller 26, the (remote) server 10, and the (control) computer 7. Then, the circulation pump 5 is turned on, and the corrosive medium flows through the first evaluation device 3 through the medium circulation pipe 6, and then flows into the raw material tank 1 through the side of the second evaluation device 4, that is, a circulation loop is formed. Carry out the test according to the required test cycle.

[0092] Repeat the above test according to the corrosion inhibitor concentration gradient designed in the test plan.

[0093] In one embodiment, when a blank test is conducted and a test is conducted with a corrosion inhibitor of a certain concentration, the ultrasonic thickness sensor monitors the thickness of the sample in real time and the converted data is reflected on the computer 7 .

[0094] The corrosion inhibitor dynamic experimental evaluation system of the present invention has a digital display control, which has a raw material storage tank (i.e., a raw material tank 1, where the raw material is a corrosive medium) that can realize pressure relief, a corrosion inhibitor intelligent filling control unit for controlling the amount of corrosion inhibitor added (which includes a corrosion inhibitor storage tank 23, a liquid level meter 24, an electric submersible pump 25 and a remote controller 26), a circulating pump 5 that can realize medium circulation, a valve system (which includes a first stop valve 13, a second stop valve 14, a third stop valve 15, a fourth stop valve 16, a fourth flow control valve 17, a fifth flow control valve 18, a sixth flow control valve 19, a first flow control valve 20, a second flow control valve 21 and a third flow control valve 22), an evaluation device for installing an evaluation sample (which includes a first evaluation device 3 and a second evaluation device 4), and a monitoring unit that can monitor the corrosion rate and corrosion inhibition rate of the evaluation device in real time (real-time ultrasonic thickness measurement, including a first ultrasonic thickness measurement sensor 8 and a second ultrasonic thickness measurement sensor 9). The evaluation system can realize heating to set the test cycle, remotely control the corrosion inhibitor filling and monitor the corrosion inhibitor rate and corrosion rate in real time. The evaluation process of corrosion inhibitors should be carried out in an environment that is as close to the on-site conditions as possible, which can simulate the flow state of the pipeline system and the pipeline corrosion conditions, so as to more accurately analyze the optimal concentration of corrosion inhibitors used in on-site conditions.

[0095] Embodiment 3

[0096] Please refer to Figure 3 , Figure 4 The present embodiment provides a corrosion inhibitor dynamic experimental evaluation system, including a raw material tank 1, a circulation pump 5 (i.e., a booster pump), an evaluation device (including a first evaluation device 3 and a second evaluation device 4), a remote corrosion inhibitor intelligent filling control unit (including a corrosion inhibitor storage tank 23, a liquid level meter 24, an electric submersible pump 25 and a remote controller 26), a remote ultrasonic online thickness sensor (including a first ultrasonic thickness sensor 8 and a second ultrasonic thickness sensor 9), and a medium circulation pipe 6; wherein the raw material tank 1 is provided with a time controller, a temperature controller, an inlet and outlet, a pressure relief port and a sealing cover; the medium circulation pipe 6 is used for medium transportation and circulation.

[0097] Among them, the heating device of the raw material tank 1 is a heating wire installed on the base of the raw material tank 1, connected to the temperature and time screen, which can set the temperature and time. The circulating booster pump is used for the outflow of the corrosive medium. The pressure relief valve 2 releases the internal pressure of the raw material tank 1 to prevent excessive steam pressure caused by temperature increase, and the sealing cover prevents the heated corrosive medium from evaporating. The circulating pump 5 is connected to the outlet on the raw material tank 1 with a medium flow pipe 6 to allow the corrosive medium to circulate and flow into the evaluation device. The flow control valve installed in front of the evaluation sample is used to limit the flow rate through each sample in the same evaluation device to be consistent.

[0098] The medium flow pipe 6 connecting the circulation booster pump, the flow control valve, the stop valve, and the evaluation device is made of acrylic material; the raw material tank 1 can be made of stainless steel material that can be heated and heat-conducted.

[0099] The raw material tank 1 can adjust any temperature to heat the corrosive medium; further, the test time can be set.

[0100] The raw material tank 1 can be loaded with a corrosive medium obtained from or simulated by mixing produced water from the on-site oil field with the corrosion inhibitor used in a certain concentration according to the on-site working conditions. The base of the raw material tank 1 can be adjusted and heated according to the required temperature on site.

[0101] A remote corrosion inhibitor intelligent filling control unit is installed above the raw material tank 1, and the addition of a fixed concentration of corrosion inhibitor can be set through the device.

[0102] Embodiment 4

[0103] Based on the same inventive concept, an embodiment of the present invention provides a readable storage medium, on which computer instructions are stored; wherein, when the computer instructions are executed by a processor, any method in the above-mentioned embodiments is implemented.

[0104] Among them, the above one or more computer instructions can be formed into a program.

[0105] The above program can be run in a processor, or it can be stored in a memory (or computer-readable medium), which includes the following steps: Permanent and non-permanent, removable and non-removable media can be implemented by any method or technology to store information. Information can be computer-readable instructions, data structures, modules of programs or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technology, read-only compact disk read-only memory (CD-ROM), digital versatile disk (DVD) or other optical storage, magnetic cassettes, tape disk storage or other magnetic storage devices or any other non-transmission media that can be used to store information that can be accessed by a computing device. As defined in this article, computer-readable media does not include the following steps: Transit media (transit med ia), such as modulated data signals and carrier waves.

[0106] These computer programs can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, so that the instructions executed on the computer or other programmable device provide instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps of the functions specified in one or more blocks can be implemented by different modules corresponding to different steps.

[0107] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A corrosion inhibitor dynamic experimental evaluation method, characterized in that: The following steps are involved: S1. Control and heat the on-site or simulated prepared oilfield produced water contained in the raw material tank to simulate the on-site temperature; S2. Control the material in the raw material tank to bypass the first evaluation device and flow through the second evaluation device and then flow into the raw material tank to form a first circulation loop, and perform the test without adding corrosion inhibitor according to the required test cycle; wherein the second evaluation device is provided with a plurality of evaluation samples; S3. Control the corrosion inhibitor intelligent filling control unit to add a set concentration of corrosion inhibitor to the raw material tank; S4. Control the corrosion inhibitor contained in the heating raw material tank, the oil field produced water prepared on site or in simulation, and simulate the on-site temperature; S5. Control the material in the raw material tank to flow through the first evaluation device and bypass the second evaluation device and then flow into the raw material tank to form a second circulation loop, and perform a corrosion inhibitor addition test according to the required test cycle; wherein the first evaluation device is provided with a plurality of evaluation samples; Wherein, an ultrasonic thickness sensor is used to measure the wall thickness of the evaluation samples in the first evaluation device and the second evaluation device in real time.

2. The corrosion inhibitor dynamic experimental evaluation method according to claim 1, characterized in that: In the corrosion inhibitor dynamic experimental evaluation method, the pressure and flow rate of the material in the first circulation loop in step S2 are controlled to simulate the on-site pressure and flow rate conditions; and / or In the corrosion inhibitor dynamic experimental evaluation method, the pressure and flow rate of the material in the second circulation loop in step S5 are controlled to simulate the on-site pressure and flow rate conditions.

3. The corrosion inhibitor dynamic experimental evaluation method according to claim 1, characterized in that: The corrosion inhibitor dynamic experimental evaluation method comprises the following steps: S01. Before step S2, a blank test is performed on the ultrasonic thickness measurement of the evaluation sample in the second evaluation device; and / or S02. Before step S5, a blank test is performed on the ultrasonic thickness measurement of the evaluation sample in the first evaluation device; and / or S6. Repeat steps S1-S5 according to the corrosion inhibitor concentration gradient designed in the experimental plan.

4. A corrosion inhibitor dynamic experimental evaluation system, characterized in that: include: Raw material tank, used to contain corrosive media; An evaluation device connected to the raw material tank; The evaluation device is used to install the evaluation sample; A corrosion inhibitor intelligent filling control unit, connected to the raw material tank and used to fill the corrosion inhibitor into the raw material tank; and A monitoring unit is used to monitor the evaluation sample.

5. The corrosion inhibitor dynamic experimental evaluation system according to claim 4, characterized in that: The evaluation device comprises: a first evaluation device; and a second evaluation device connected in series with the first evaluation device; Wherein, in the first evaluation device and the second evaluation device, the evaluation samples are provided in plurality, and each of the evaluation samples is set as a tubular sample made of the same material as that on site.

6. The corrosion inhibitor dynamic experimental evaluation system according to claim 5, characterized in that: The first evaluation device and the second evaluation device are both provided with connecting and fixing rings; the connecting and fixing rings are arranged in pairs, and a connecting and fixing ring in a pair is used to fix an evaluation sample; each connecting and fixing ring is connected to the pipeline of the corrosion inhibitor dynamic experimental evaluation system.

7. The corrosion inhibitor dynamic experimental evaluation system according to claim 4 or 5, characterized in that: A circulation pump is arranged between the raw material tank and the first evaluation device, two paths are arranged between the circulation pump and the first evaluation device, one path is connected to the first evaluation device, and the other path is connected in parallel with the first evaluation device, each path uses a valve to control the flow of the medium, and a flow control valve is arranged at the front end of each evaluation sample connected to the first evaluation device; and / or The first evaluation device has two paths at the rear end, one connected to the second evaluation device and the other connected in parallel with the second evaluation device. Each path uses a valve to control the flow of the medium, and a flow control valve is set at the front end of each evaluation sample connected to the second evaluation device.

8. The corrosion inhibitor dynamic experimental evaluation system according to claim 4, characterized in that: In the corrosion inhibitor dynamic experimental evaluation system, the monitoring unit includes: an ultrasonic thickness sensor, disposed on the upper part and / or the lower part of each evaluation sample; and A server connected to the ultrasonic thickness sensor, wherein the server supports remote control; Wherein, the server is used to control the ultrasonic thickness sensor to measure the wall thickness of the evaluation sample in real time according to the test cycle, and output the data to the computer; and / or In the corrosion inhibitor dynamic experimental evaluation system, the corrosion inhibitor intelligent filling control unit includes: Corrosion inhibitor storage tanks; and An electric submersible pump is connected to the corrosion inhibitor storage tank; an outlet of the electric submersible pump is connected to a raw material tank, and the electric submersible pump is sequentially connected to a remote controller and the computer.

9. The corrosion inhibitor dynamic experimental evaluation system according to any one of claims 4 to 6 and 8, characterized in that: The raw material tank is provided with a heating device and / or a pressure relief valve; the heating device is connected to a time controller and / or a temperature controller.

10. A readable storage medium, characterized in that: The readable storage medium stores computer instructions; wherein, when the computer instructions are executed by a processor, the method described in any one of claims 1 to 3 is implemented.

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