CN116818997A - Device and method for testing performance of scale inhibitor - Google Patents
Device and method for testing performance of scale inhibitor Download PDFInfo
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- CN116818997A CN116818997A CN202310626927.5A CN202310626927A CN116818997A CN 116818997 A CN116818997 A CN 116818997A CN 202310626927 A CN202310626927 A CN 202310626927A CN 116818997 A CN116818997 A CN 116818997A
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- 238000012544 monitoring process Methods 0.000 claims abstract description 21
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- 229910052757 nitrogen Inorganic materials 0.000 claims description 27
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- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims description 10
- 238000007599 discharging Methods 0.000 claims description 9
- 238000005057 refrigeration Methods 0.000 claims description 9
- 238000013480 data collection Methods 0.000 claims description 7
- 238000002156 mixing Methods 0.000 claims description 6
- 238000011056 performance test Methods 0.000 claims description 6
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- 229910002092 carbon dioxide Inorganic materials 0.000 claims description 5
- 239000001569 carbon dioxide Substances 0.000 claims description 5
- 239000012530 fluid Substances 0.000 claims description 5
- 238000001802 infusion Methods 0.000 claims description 5
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- 239000002912 waste gas Substances 0.000 claims description 4
- 238000011010 flushing procedure Methods 0.000 claims description 3
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 abstract description 22
- 239000003345 natural gas Substances 0.000 abstract description 11
- 239000003209 petroleum derivative Substances 0.000 abstract description 11
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- 239000000243 solution Substances 0.000 description 172
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 16
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- 229910052760 oxygen Inorganic materials 0.000 description 16
- 230000007797 corrosion Effects 0.000 description 14
- 238000005260 corrosion Methods 0.000 description 14
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- 230000002829 reductive effect Effects 0.000 description 12
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- BVKZGUZCCUSVTD-UHFFFAOYSA-M Bicarbonate Chemical compound OC([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-M 0.000 description 2
- BHPQYMZQTOCNFJ-UHFFFAOYSA-N Calcium cation Chemical compound [Ca+2] BHPQYMZQTOCNFJ-UHFFFAOYSA-N 0.000 description 2
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 2
- JLVVSXFLKOJNIY-UHFFFAOYSA-N Magnesium ion Chemical compound [Mg+2] JLVVSXFLKOJNIY-UHFFFAOYSA-N 0.000 description 2
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Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
Abstract
The invention discloses a scale inhibitor performance testing device and method, comprising a solution system, a gas system and a circulation system which are respectively connected with the solution system, wherein the circulation system is also connected with a scale system, the scale system is in communication connection with a data system for monitoring environmental parameters in the scale system, the output end of the scale system is also connected with a recovery system, and refrigerating equipment is arranged outside the scale system, so that the scale condition of deep sea low-temperature working conditions can be truly simulated, and the problem of inaccurate monitoring of scale in a pipeline under service working conditions is solved. The testing device and the testing method can be used for carrying out performance evaluation work of the scale inhibitor in the petroleum and natural gas pipeline in a deep sea environment in a laboratory, overcomes the defect that the scale inhibitor cannot simulate a low-temperature environment in petroleum and natural gas pipeline scale research equipment, and provides an equipment foundation for performance evaluation and optimization of the scale inhibitor in the deep sea low-temperature environment and deep research of a scale mechanism.
Description
Technical Field
The invention relates to the technical field of reagent testing, in particular to a device and a method for testing the performance of a scale inhibitor.
Background
Petroleum and natural gas are the main energy sources required for human production and life, and the position of the petroleum and natural gas in the whole national economy is increasingly important. Equipment, pipelines and the like in the deep sea petroleum and natural gas exploitation and transportation process are mainly made of metal materials, and corrosion of the metal is inevitable. The serious corrosion damage not only causes huge economic loss, but also causes serious pollution to the environment, and becomes an important factor for restricting the development of deep sea petroleum and natural gas. Deep sea oil and gas produced water often contains corrosive particles, and deposits tend to form between the particles, with under-scale corrosion being one of the important risks of corrosion perforation of deep water pipelines. The scaling occurs in the pipeline, the conveying sectional area is reduced, the conveying efficiency is reduced, and the conveying pipe is blocked and scrapped when serious, so that the safe and efficient operation of the pipeline is affected.
The low-temperature environment and complex corrosion factors inside the deep sea petroleum and natural gas conveying pipeline increase the difficulty of corrosion working condition simulation and scale removal. At present, two common descaling methods are mainly used at home and abroad, one is to utilize a spherical pig to periodically remove sediment in a pipeline by a mechanical method; the other is to add a scale inhibitor with a certain concentration into water quality by a chemical method. The former can affect the integrity of the corrosion inhibitor film and the corrosion rate of the matrix due to the direct contact of the mechanical pig with the inner wall of the pipeline; the scale inhibitor can inhibit the scale formation of water quality at filling points of all well sections, but has various types and certain applicable conditions, the effectiveness and compatibility of the scale inhibitor under specific environments are required to be tested before the scale inhibitor is selected, and the scale inhibitor can be put into industrial use only when the corrosion rate and the adhesion rate of a metal test tube reach required indexes. In the prior art, a mainly used scale inhibitor performance test device is a flow loop, the equipment can realize the simulation of environmental parameters of normal-temperature and high-temperature corrosion systems, is difficult to be suitable for deep sea low-temperature environments, and cannot truly simulate the scaling condition of a specific corrosive gas (mixed gas of carbon dioxide and nitrogen) in a deep sea pipe; and once scaling occurs, the equipment cleaning difficulty is high, which is not beneficial to the performance evaluation work of the scale inhibitor in the deep sea low-temperature environment.
Therefore, a device and a method for testing the performance of the scale inhibitor, which can simulate the deep sea low-temperature environment in the petroleum and gas industry, are needed to fill the gap in the market at present.
Disclosure of Invention
The invention aims to overcome the defects that the conventional scale inhibitor testing device can only realize normal temperature and high temperature systems, is difficult to adapt to deep sea low temperature conditions and simulate the environment in a deep sea pipe, and provides a scale inhibitor performance testing device and method.
The technical scheme adopted by the invention is as follows:
a scale inhibitor performance testing device comprises a solution system, wherein the solution system comprises independent liquid supply pipelines, and solutions in the solution system are not mixed before reaching the scale formation system. The solution system is connected with a gas system and a circulation system, the circulation system is also connected with a scaling system, the scaling system is in communication connection with a data system for monitoring environmental parameters in the scaling system, the output end of the scaling system is also connected with a recovery system, and refrigerating equipment is arranged outside the scaling system. The scale system comprises a scale test tube for testing the performance of the scale inhibitor, and a first pressure sensor and a second pressure sensor for monitoring the pressure of the interval position of the scale test tube are arranged inside the scale test tube.
The testing device mainly comprises six systems, namely a solution system, a gas system, a circulating system, a scaling system, a data system and a recovery system, wherein the solution system is used for storing an ionic solution simulating a field environment and storing a scale inhibitor to be tested, and the ionic solution and the scale inhibitor to be tested are mutually independent when reaching the scaling solution system;
the gas system stores gas with higher chemical stability, is used for removing dissolved oxygen in the solution system, and can provide medium gas to simulate the deep sea pipeline environment;
the circulating system is a power source of the testing device and is used for conveying the ionic solution and the scale inhibitor from the solution system to the scaling system;
the scale formation system is a carrier for testing the performance of the scale inhibitor, the environment temperature of the scale formation system is reduced to a specified temperature through refrigerating equipment such as a condenser, the low-temperature environment of deep sea is simulated, the environment parameters of the solution and the scale inhibitor can be changed when the solution and the scale inhibitor flow through the scale formation system, and the relevant data of the performance of the scale inhibitor can be obtained through the measurement of the environment parameters by the data system;
the recovery system is used for recovering the waste liquid after the test, so that the environmental pollution is avoided.
The working principle of the invention is as follows: when in use, firstly, the ion solution and the scale inhibitor to be measured are stored in a solution system and kept in a sealing state; then, opening a gas system, introducing nitrogen into the solution system to deoxidize, and simultaneously opening refrigeration equipment to reduce the ambient temperature of the scaling system to a specified temperature; after the deoxidization is finished, discharging test gas in the solution system; replacing a gas source of a gas system, replacing nitrogen with medium gas simulating the environment in a deep sea pipe, and introducing the medium gas into a solution system through the gas system; after preparation work is completed, opening a circulation system, conveying an ionic solution to a scaling system, mixing and scaling the solution in the scaling system in the flowing process, and performing scaling test; and then, monitoring the environmental parameter change of the scaling system before and after scaling through a data system, transmitting signals to the rear end, realizing data output, recording and analysis, and providing a device foundation for evaluating and optimizing the performance of the scale inhibitor in a deep sea low-temperature environment and further researching the scaling mechanism. The first pressure sensor and the second pressure sensor respectively monitor the pressure of two interval positions in the scaling test tube, wherein the two interval positions can be two ends of the scaling test tube, and the pressure monitoring position can be changed according to the test purpose. The scaling test adopts a test mode of unit time, namely the scaling test is carried out in unit time, and the scaling tendency of the scaling test is predicted according to the scaling result in unit time, so as to evaluate the performances of different scale inhibitors. Meanwhile, the pressure sensor is arranged on the scaling test tube, so that the scaling test tube can be used for monitoring the flow velocity in the test tube, judging scaling trend, and monitoring the environmental factors in the test tube to ensure that the environmental pressure in the test process accords with the simulated condition in the real sea pipe.
Common ways of removing dissolved oxygen from the solution mainly include chemical agents, heating or nitrogen blowing (nitrogen stripping). In this case, the chemical agent or the heating method may affect the properties of the solution, and change the real environment to be simulated in the present invention, so that the method is not used in the present invention. According to the invention, nitrogen is introduced into the solution, so that the partial pressure of dissolved oxygen in the solution is changed, and the dissolved oxygen is accelerated to diffuse into the gas phase due to the increase of the liquid phase pressure by utilizing the gas-liquid phase pressure balance principle. In addition, the introduced nitrogen gas does not react with substances in the solution, so that the properties of the solution are not changed.
In addition to temperature, pH, etc., flow rate and pressure are also key factors affecting fouling rate. The scaling rate decreases with increasing fluid velocity, which may be explained by the increase in the rate of scale deposition that increases with increasing flow rate, but the increase in the rate of degradation that results from increasing flow rate is more pronounced, thus resulting in a decrease in the overall rate of increase. The change in flow rate in the conduit in turn necessarily results in a change in hydraulic pressure. When a scale is formed somewhere in the pipeline, the cross-sectional area of the pipeline is reduced, so that the flow velocity of the fluid is increased, however, after the pipeline passes through the scale forming position, the cross-sectional area is restored to the initial state, and the flow velocity is reduced, so that the scale forming rate is increased, and the scale forming phenomenon is more easy to occur at the downstream of the scale forming position. The first pressure sensor monitors the pressure in the scaling test tube when the anionic and cationic solutions are just mixed; the second pressure sensor tests the pressure in the scale forming test tube for a distance after mixing the anionic and cationic solutions. After the anionic solution and the cationic solution are mixed, the middle and rear sections of the scaling test tube can be uniformly scaled. If the scale inhibitor is poor in effect, the rear section of the scale forming test tube can be greatly scaled, so that the channel area of the scale forming test tube is reduced, the pressure at the position where the second pressure sensor is arranged is increased, and the increase of the pressure is in direct proportion to the increase of the scale forming amount, so that the scale forming tendency of target anions and cations and the scale inhibiting performance of the scale inhibitor can be judged through the pressure difference between the first pressure sensor and the second pressure sensor. Because the inner diameter of the scaling test tube is smaller, under the limit condition, the scaling test tube can be completely blocked due to scaling, the monitoring result of the second pressure sensor is 0, the pressure difference reaches the maximum value (differential pressure overrun), the scaling tendency of the solution under the condition can be proved to be very large, and the test can be stopped.
Further, the solution system comprises at least two solution storage tanks arranged in parallel, and the solution storage tanks are not communicated. When the number of the solution storage tanks is two, respectively adding an anion solution and a cation solution, so as to avoid the chemical reaction of the anion solution and the cation solution before the test simulation starts and influence the accuracy of the test; the agent (i.e., the scale inhibitor to be tested) is then added to either solution storage tank. If the number of solution storage tanks is more than two, two of the solution storage tanks are used for containing the anionic solution and the cationic solution respectively, and the other solution storage tanks are used for containing the medicament or the acidic solution for cleaning. The solution storage tank is provided with an air inlet, an air outlet and a liquid outlet, the air inlet is connected with the gas system in a sealing way, the air outlet is connected with the waste gas treatment system, and the liquid outlet is connected with the circulation system. When the solution and the scale inhibitor to be measured are filled, the cover of the solution storage tank is covered to seal the solution storage tank, and then gas with stable chemical property, such as nitrogen, is injected into the solution storage tank through the air inlet, so that the air in the solution storage tank is discharged into the waste gas treatment system through the air outlet. After the air is completely discharged, the equilibrium concentration of oxygen in the solution storage tank is reduced, so that the solubility of dissolved oxygen in the solution is correspondingly reduced, and the dissolved oxygen can escape from the solution, thereby achieving the purpose of discharging the dissolved oxygen in the solution. After the dissolved oxygen is discharged, specific corrosive gas (mixed gas of carbon dioxide and nitrogen) which can simulate the inside of the deep sea pipe is introduced into the solution storage tank for standing, and then a circulation system is started to convey the solution in the solution storage tank or the scale inhibitor to be measured to a scaling system.
Further, the solution storage tanks are provided with three, including a first solution storage tank, a second solution storage tank, and a third solution storage tank. The first solution storage tank is used for storing an anion solution, wherein the anion solution is common substances which are easy to scale, such as carbonate ions, bicarbonate ions and the like; the second solution storage tank is used for storing common cation solutions which are easy to scale and comprise calcium ions, magnesium ions and the like; the anion solution and the cation solution are separately arranged, so that the chemical reaction of anions and cations in the corrosive medium simulation solution before the test is started is avoided, and the test error is effectively reduced. The third solution storage tank is used for storing the scale inhibitor to be measured.
Further, the gas system comprises a gas cylinder for storing high-pressure gas, the gas cylinder is communicated with the solution system through a gas pipe, and a pressure reducing valve and a control valve are arranged on the gas pipe. For the purpose of the test, there are at least two kinds of gas cylinders, one of which is used for discharging dissolved oxygen in the solution, and the other is used for providing a gas capable of simulating specific corrosivity inside the deep sea pipe.
Further, the circulation system comprises a liquid phase pump for extracting the solution from the solution storage tank and a flow regulator connected with the liquid phase pump, wherein the solution system, the liquid phase pump, the flow regulator and the scaling system are respectively connected in series through a liquid conveying pipe, specifically, the liquid conveying pipe extends out of the solution storage tank and is sequentially connected with the liquid phase pump and the flow regulator, then the scaling system is connected, and the solution is supplied with power through the liquid phase pump to be conveyed into the scaling system. For convenient control, the number of the liquid phase pumps and the flow regulators are in one-to-one correspondence with the number of the solution storage tanks, so that independent control of each solution storage tank is realized.
Further, the scale formation system comprises a ball valve for converging a plurality of infusion pipes and a scale formation test tube for testing the performance of the scale inhibitor, wherein the input end of the ball valve is connected with the infusion pipe, the output end of the ball valve is detachably connected with one end of the scale formation test tube, the other end of the scale formation test tube is detachably connected with a liquid outlet pipe, and the liquid outlet pipe is connected with the recovery system. The anionic and cationic solutions are pooled by ball valve and then flow through the scale forming tube where they are scaled. The scale formation test tube is detachable, so that on one hand, the scale formation test tube can be detached to clean scale formed on the inner wall of the scale formation test tube, and on the other hand, the scale formation test tube can be replaced by materials meeting the test requirements to simulate the real scale formation environment. The inside of the scaling test tube is also provided with a temperature sensor for monitoring whether the temperature inside the scaling test tube accords with the low-temperature simulation environment. The first pressure sensor and the second pressure sensor respectively monitor the pressure at two ends of the scaling test tube. The first pressure sensor monitors the pressure in the scaling test tube when the anion solution and the cation solution are just mixed, and is arranged at one end, close to the ball valve, of the scaling test tube; the second pressure sensor is used for testing the pressure in the scaling test tube at a certain distance after the negative and positive ion solutions are mixed, and the second pressure sensor is arranged at one end, close to the liquid outlet pipe, in the scaling test tube.
Further, the data system comprises a data collection device and a display, wherein the data collection device is in communication connection with the first pressure sensor, the second pressure sensor and the temperature sensor, the monitoring values of the temperature and the pressure are transmitted to the data collection device, and the data collection device stores, counts and analyzes the collected data and feeds the collected data back to a tester through the display.
The invention also provides a method for testing the performance of the scale inhibitor, which uses the testing device and comprises the following steps:
s1, opening a solution system, adding prepared solution, and keeping a sealing state;
s2, opening a gas system, introducing nitrogen into the solution system to deoxidize, and simultaneously opening refrigeration equipment to reduce the ambient temperature of the scaling system to a specified temperature; after the deoxidation is finished, the test gas in the solution system is discharged; replacing a gas source of a gas system, replacing nitrogen with medium gas simulating the environment in a deep sea pipe, and introducing the medium gas into a solution system through the gas system;
s3, opening a circulation system, setting a target liquid phase flow rate, conveying the solution to a scaling system, mixing and scaling the solution in a scaling test tube in the scaling system in the flowing process, and performing scaling test;
s4, monitoring pressure and temperature parameter changes of the scaling test tube before and after scaling through a data system, and transmitting signals to the rear end to realize data output, recording and analysis;
s5, after the scaling test is finished, preparing low-concentration acid liquor, adding the low-concentration acid liquor into a solution system, opening a circulation system, and pumping out the acid liquor in the solution system and conveying the acid liquor to the scaling system for pipeline flushing;
and S6, after the pipeline is washed, sequentially closing the circulation system, the data system and the refrigeration equipment, removing the scaling test tube and cleaning.
Further, the specific operation procedure of the step S2 includes:
s21, opening a gas system to enable nitrogen to enter a solution system, and deoxidizing a solution in the solution system;
step S22, the time of the deoxidization process is at least 30 minutes;
s23, closing a gas system, and discharging nitrogen in the solution system and performing harmless treatment;
s24, replacing a gas source of the gas system with medium gas mixed by carbon dioxide and nitrogen from nitrogen, and opening the gas system to enable the medium gas to enter the solution system;
step S25, introducing medium gas for at least 30 minutes;
and S26, closing the gas system, discharging the medium gas in the solution system, and performing harmless treatment.
In step S21, nitrogen is introduced into the solution to change the partial pressure of dissolved oxygen in the solution, and the dissolved oxygen is rapidly diffused into the gas phase due to the increase of the liquid phase pressure by using the principle of gas-liquid phase pressure balance. In addition, the introduced nitrogen gas does not react with substances in the solution, so that the properties of the solution are not changed. Of course, step S21 to step S23 may be omitted, and a sufficient amount of medium gas may be directly introduced, so that dissolved oxygen in the solution may be removed. From the practical point of view, the cost of nitrogen is lower, so that dissolved oxygen is removed by nitrogen in the early stage, and medium gas is introduced after the deoxidization is finished so as to simulate the environment in the deep sea pipeline.
Further, the specific operation procedure of the step S4 is as follows:
s41, measuring the temperature in a scale-formed test tube by a data system;
step S42, a first pressure sensor monitors the pressure of the inner cavity of the scaling test tube when the solutions are just mixed, a second pressure sensor monitors the pressure of the inner cavity of the scaling test tube after the solutions are completely mixed, and the pressure difference is calculated through the two monitoring values;
and step S43, transmitting the temperature and pressure difference values to a data system, and storing, counting and analyzing the collected data by the data system and feeding back the result to the testers.
Compared with the prior art, the invention has the beneficial effects that:
1. the testing device disclosed by the invention can truly simulate the scaling situation of a deep sea low-temperature working condition, solves the problem of accurate monitoring of scaling in a pipeline under a service working condition, and achieves real-time adjustment of corrosion environment parameters such as pH value, medium gas components, medium solution components, medicament concentration and the like of a corrosion system by adding a new corrosion medium simulation solution to a scaling testing system through a solution system, so that the on-site corrosion environment of a deep sea pipe is truly simulated;
2. by arranging the solution system, the pretreatment process of the corrosive medium simulation solution and the solution scaling process are strictly separated, so that the accurate control and the real simulation of the corrosive scaling process are realized, the chemical reaction of anions and cations in the corrosive medium simulation solution before the test is started is avoided, and the test error is effectively reduced;
3. the testing device and the testing method can be used for carrying out performance evaluation work of the scale inhibitor in the petroleum and natural gas pipeline in a deep sea environment in a laboratory, overcomes the defect that the scale inhibitor cannot simulate a low-temperature environment in petroleum and natural gas pipeline scale research equipment, and provides an equipment foundation for performance evaluation and optimization of the scale inhibitor in the deep sea low-temperature environment and deep research of a scale mechanism.
Drawings
FIG. 1 is a schematic diagram of a scale inhibitor performance testing apparatus according to the present invention;
FIG. 2 is a schematic diagram showing a specific structure of the scale inhibitor performance test device according to the present invention;
FIG. 3 is a schematic view of the solution storage tank of the present invention;
FIG. 4 is a flow chart of the method for testing the performance of the scale inhibitor of the present invention;
in the accompanying drawings:
1-a solution system; 101-a first solution storage tank; 102-a second solution storage tank; 103-a third solution storage tank; 104-an air inlet; 105-gas outlet; 106, a liquid outlet; 2-gas system; 201-gas cylinder; 202-a gas pipe; 203-a pressure reducing valve; 204-control valve; 3-a flow-through system; 301-a liquid phase pump; 302-a flow regulator; 303-an infusion tube; 4-fouling system; 401-ball valve; 402-scaling the test tube; 403-a liquid outlet pipe; 5-a data system; 501-a first pressure sensor; 502-a second pressure sensor; 503-a temperature sensor; 504-data collection means; 505-a display; 6-a recovery system; 701-an insulation box body; 702-an air compressor; 703-a condenser; 8-an exhaust treatment system.
Detailed Description
The invention is further described below in connection with the following detailed description. Wherein the drawings are for illustrative purposes only and are not to be construed as limiting the present patent; for the purpose of better illustrating the embodiments, certain elements of the drawings may be omitted, enlarged or reduced and do not represent the actual product dimensions; it will be appreciated by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
The same or similar reference numbers in the drawings of embodiments of the invention correspond to the same or similar components; in the description of the present invention, it should be understood that, if there is an azimuth or positional relationship indicated by terms such as "front", "rear", "left", "right", etc., based on the azimuth or positional relationship shown in the drawings, it is only for convenience of describing the present invention and simplifying the description, but it is not indicated or implied that the apparatus or element referred to must have a specific azimuth, be constructed and operated in a specific azimuth, and thus terms describing the positional relationship in the drawings are merely illustrative and should not be construed as limitations of the present patent, and specific meanings of the terms described above may be understood by those skilled in the art according to specific circumstances. Furthermore, descriptions such as those referred to as "first," "second," and the like, are provided for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implying an order of magnitude of the indicated technical features in the present disclosure. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature.
Embodiment one:
referring to fig. 1 and 2, the present embodiment provides a scale inhibitor performance testing apparatus, which includes a solution system 1 for storing an ion solution and a scale inhibitor to be tested, a gas system 2 for storing a chemically stable gas, a flow system 3 for providing a fluid power source, a scale formation system 4 as a scale formation carrier for simulating a deep sea low temperature environment, a data system 5 for monitoring test data, and a recovery system 6 for recovering the waste liquid after the test. The solution system 1 comprises separate liquid supply lines, the solutions in the solution system 1 not being mixed before reaching the fouling system 4. The scaling system 4 comprises a scaling test tube 402 for testing the performance of the scale inhibitor, and a first pressure sensor 501 and a second pressure sensor 502 for respectively monitoring the pressure at two ends of the scaling test tube 402 are arranged inside the scaling test tube 402. The system comprises a gas system 2, a solution system 1, a circulation system 3, a scaling system 4 and a recovery system 6, wherein the scaling system 4 is in communication connection with a data system 5, an insulation box 701 is coated outside the scaling system 4, and refrigeration equipment is arranged on the insulation box 701. It should be noted that, the refrigeration device used in this embodiment includes an air compressor 702 and a condenser 703, which belongs to the prior art, and other devices with cooling effect may be used to make the temperature in the insulation box 701, that is, the ambient temperature of the scaling system 4 reach the specified temperature.
Referring to fig. 4, the embodiment also provides a method for testing performance of a scale inhibitor, using the testing device, the testing method includes the following steps:
s1, opening a solution system 1, adding prepared solution, and keeping the solution system 1 in a sealed state;
step S2, opening a gas system 2, introducing nitrogen into the solution system 1 to deoxidize, and simultaneously opening an air compressor 702 and a condenser 703 to reduce the temperature in the heat preservation box 701 to a specified temperature; after the deoxidation is finished, the test gas in the solution system 1 is discharged; replacing the gas source of the gas system 2, replacing nitrogen with medium gas simulating the environment in the deep sea pipe, and introducing the medium gas into the solution system 1 through the gas system 2;
step S3, opening the circulation system 3, setting a target liquid phase flow rate, pumping out the solution in the solution system 1 and conveying the solution to the scaling system 4, mixing and scaling the solution in the scaling system 4, and performing scaling test in the scaling test tube 402;
step S4, monitoring the environmental parameter changes of the scaling test tube 402 before and after scaling through the data system 5, transmitting signals to the rear end, realizing data output, recording and analysis, and discharging waste liquid into the recovery system 6;
s5, after the scaling test is finished, preparing low-concentration acid liquor, adding the low-concentration acid liquor into the solution system 1, opening the circulation system 3, pumping out the acid liquor in the solution system 1, conveying the acid liquor to the scaling system 4 for pipeline flushing, and discharging the flushed acid liquor into the recovery system 6;
and S6, after the pipeline is washed, the circulation system 3, the data system 5 and the refrigeration equipment are sequentially closed, and the scaling test tube 402 in the scaling system 4 is detached and cleaned.
By the testing device and the testing method, the scaling condition in the pipe under the deep sea low-temperature working condition and the scale inhibition effect of the scale inhibitor can be simulated, the performance of the scale inhibitor is monitored by utilizing the pressure difference, and the testing device and the testing method can be used for carrying out performance evaluation work of the scale inhibitor in the petroleum and natural gas pipeline under the deep sea environment in a laboratory.
Embodiment two:
in order to avoid the chemical reaction of anions and cations in the corrosive medium simulation solution before the start of the test, reduce the test error, and more conveniently perform the deoxidization operation, as shown in fig. 1 or fig. 2 and fig. 3, the solution system 1 in this embodiment includes three solution storage tanks, which are a first solution storage tank 101, a second solution storage tank 102 and a third solution storage tank 103, that are arranged in parallel on the basis of the first embodiment. Wherein the first solution storage tank 101 is used for storing an anion solution, and the anion solution is common substances easy to scale, such as carbonate ions, bicarbonate ions and the like; the second solution storage tank 102 is used for storing common cation solutions which are easy to scale, including calcium ions, magnesium ions and the like; the third solution storage tank 103 is used for storing the scale inhibitor to be measured. It should be noted that the number of the solution storage tanks is not limited to three in the embodiment, and if there are multiple anionic and cationic solutions or multiple scale inhibitors to be tested, the solution storage tanks may be added in parallel according to actual needs.
Any one of the first solution storage tank 101, the second solution storage tank 102 and the third solution storage tank 103 is provided with an air inlet 104, an air outlet 105 and a liquid outlet 106, the air inlet 104 is in sealed connection with the gas system 2, the air outlet 105 is connected with the waste gas treatment system 8, and the liquid outlet 106 is connected with the circulation system 3. When the solution and the scale inhibitor to be measured are filled, the cover of the solution storage tank is covered to seal the solution storage tank, and then deoxygenation is carried out. The deoxidization means that nitrogen with stable chemical property is injected into the solution storage tank through the air inlet 104, so that air in the solution storage tank is discharged into the exhaust gas treatment system 8 through the air outlet 105. The oxygen removal process is at least 30 minutes. After the dissolved oxygen is discharged, a specific corrosive gas (such as a mixed gas of carbon dioxide and nitrogen) which can simulate the inside of the deep sea pipe is introduced into the solution storage tank for standing, and then the circulation system 3 is started to convey the solution in the solution storage tank or the scale inhibitor to be measured to the scaling system 4.
The flow system 3 comprises a liquid phase pump 301 and a flow regulator 302, a liquid transfer pipe 303 extends from the solution storage tank and is sequentially connected with the liquid phase pump 301 and the flow regulator 302, and then is connected with the scaling system 4, and the liquid phase pump 301 supplies power to convey the solution into the scaling system 4. For convenience, the liquid phase pump 301 and the flow regulator 302 are respectively provided with three liquid phase pumps, which are respectively corresponding to the first solution storage tank 101, the second solution storage tank 102 and the third solution storage tank 103.
Embodiment III:
referring to fig. 1 and 2, the scale system 4 according to the present embodiment includes a ball valve 401 for collecting a plurality of fluid lines 303 and a scale tube 402 for testing the performance of the scale inhibitor, based on any of the above embodiments. In this embodiment, the ball valve 401 is a three-way ball valve, and has three input ends and one output end. The input of ball valve 401 is connected with transfer line 303, and its output is connected with scale deposit test tube 402 one end detachably, and the other end of scale deposit test tube 402 is connected with drain pipe 403 detachably, and drain pipe 403 is connected with recovery system 6. The anionic and cationic solutions are pooled by ball valve 401 and then flow through scaling tube 402 and scale within scaling tube 402. The scale forming test tube 402 is detachable, so that on one hand, the scale forming test tube can be detached to clean scale formed on the inner wall of the scale forming test tube, and on the other hand, the scale forming test tube can be replaced by materials meeting test requirements (such as 316L stainless steel commonly used in deep sea petroleum and natural gas pipelines) to simulate a real scale forming environment. The first pressure sensor 501, the second pressure sensor 502 and the temperature sensor 503 are arranged inside the scaling test tube 402, and the first pressure sensor 501 and the second pressure sensor 502 respectively monitor the pressure at two ends of the scaling test tube 402. A first pressure sensor 501 monitors the pressure in the scale forming tube 402 when the anionic and cationic solutions are just mixed, and the first pressure sensor 501 is arranged at one end, close to the ball valve 401, of the scale forming tube 402; a second pressure sensor 502 measures the pressure in the scale tube 402 a distance after mixing the anionic and cationic solutions, the second pressure sensor 502 being disposed in the scale tube 402 at an end near the outlet tube 403. If the scale inhibitor is not effective, the rear section of the scale forming test tube 402 will scale greatly, so that the channel area of the scale forming test tube 402 is reduced, the pressure at the position where the second pressure sensor 502 is disposed will become large, and the increase of the pressure is proportional to the increase of the scale forming amount, so that the scale forming tendency of the target anions and cations and the scale inhibiting performance of the scale inhibitor can be determined by the pressure difference between the first pressure sensor 501 and the second pressure sensor 502.
In this embodiment, the data system 5 includes a data collecting device 504 and a display 505 that are communicatively connected to the first pressure sensor 501, the second pressure sensor 502, and the temperature sensor 503, where the monitored values of the temperature and the pressure are transmitted to the data collecting device 504, and the data collecting device 504 stores, counts and analyzes the collected data, and feeds back to the test person through the display 505. It should be noted that the data collection device 504 and the display 505 may be integrated into a data processing device similar to a tablet computer, so that data processing can be realized, and interaction with a tester can be performed. At the same time, the data processing device can be connected in wireless communication with the data system 5, so that the test person can remotely office in a control room with his hands without having to stand beside the test device.
In the specific content of the above embodiment, any combination of the technical features may be performed without contradiction, and for brevity of description, all possible combinations of the technical features are not described, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
It is to be understood that the above examples of the present invention are provided by way of illustration only and not by way of limitation of the embodiments of the present invention. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the invention are desired to be protected by the following claims.
Claims (10)
1. The scale inhibitor performance testing device is characterized by comprising a solution system (1) capable of independently supplying liquid, wherein the solution system (1) is connected with a gas system (2) and a circulating system (3); the circulating system (3) is also connected with a scaling system (4), the scaling system (4) is in communication connection with a data system (5) for monitoring environmental parameters in the scaling system (4), the output end of the scaling system (4) is also connected with a recovery system (6), refrigeration equipment is arranged outside the scaling system (4), and solutions in the solution system (1) are mutually independent before reaching the scaling system (4);
the scaling system (4) comprises a scaling test tube (402) for testing the performance of the scale inhibitor, and a first pressure sensor (501) and a second pressure sensor (502) which are respectively used for monitoring the pressure of the interval position of the scaling test tube (402) are arranged inside the scaling test tube (402).
2. The scale inhibitor performance test device according to claim 1, wherein the solution system (1) comprises at least two solution storage tanks which are arranged in parallel, an air inlet (104), an air outlet (105) and a liquid outlet (106) are arranged on the solution storage tanks, the air inlet (104) is in sealing connection with the gas system (2), the air outlet (105) is connected with the waste gas treatment system (8), and the liquid outlet (106) is connected with the circulation system (3).
3. The scale inhibitor performance test device according to claim 2, wherein the solution storage tank includes a first solution storage tank (101), a second solution storage tank (102), and a third solution storage tank (103).
4. A scale inhibitor performance test device according to claim 2 or 3, characterized in that the gas system (2) comprises a gas cylinder (201) for storing high pressure gas, the gas cylinder (201) is communicated with the solution system (1) through a gas pipe (202), and a pressure reducing valve (203) and a control valve (204) are arranged on the gas pipe (202).
5. A scale inhibitor performance testing apparatus according to claim 2 or 3, wherein the flow-through system (3) comprises a liquid phase pump (301) for pumping the solution from the solution storage tank, and a flow regulator (302) connected to the liquid phase pump (301), the solution system (1), the liquid phase pump (301), the flow regulator (302) and the scale formation system (4) being connected in series via a fluid pipe (303), respectively.
6. The scale inhibitor performance test device according to claim 5, wherein the scaling system (4) comprises a ball valve (401) for converging a plurality of infusion tubes (303), the input end of the ball valve (401) is connected with the infusion tubes (303), the output end of the ball valve is detachably connected with one end of a scaling test tube (402), the other end of the scaling test tube (402) is detachably connected with a liquid outlet pipe (403), and the liquid outlet pipe (403) is connected with the recovery system (6); a temperature sensor (503) is also arranged inside the scaling test tube (402).
7. The scale inhibitor performance testing apparatus of claim 6, wherein the data system (5) comprises a data collection device (504) and a display (505) in communicative connection with the first pressure sensor (501), the second pressure sensor (502), and the temperature sensor (503).
8. A method for testing the performance of a scale inhibitor, using the device for testing the performance of a scale inhibitor according to any one of claims 1 to 7, comprising the steps of:
s1, opening a solution system (1), adding the prepared solution, and keeping a sealing state;
s2, opening a gas system (2), introducing nitrogen into the solution system (1) to deoxidize, and simultaneously opening refrigeration equipment to reduce the ambient temperature of the scaling system (4) to a specified temperature; after the deoxidation is finished, the test gas in the solution system (1) is discharged; replacing an air source of the air system (2), replacing nitrogen with medium gas simulating the environment in the deep sea pipe, and introducing the medium gas into the solution system (1) through the air system (2);
s3, opening a circulation system (3), setting a target liquid phase flow rate, pumping out the solution in the solution system (1) and conveying the solution to a scaling system (4), mixing and scaling the solution in a scaling test tube (402) in the scaling system (4) in the flowing process, and performing scaling test;
s4, monitoring pressure and temperature parameter changes of the scaling test tube (402) before and after scaling through a data system (5), and transmitting signals to the rear end to realize data output, recording and analysis;
s5, after the scaling test is finished, preparing low-concentration acid liquor, adding the low-concentration acid liquor into the solution system (1), opening the circulation system (3), and pumping out the acid liquor in the solution system (1) and conveying the acid liquor to the scaling system (4) for pipeline flushing;
and S6, after the pipeline is washed, sequentially closing the circulation system (3), the data system (5) and the refrigeration equipment, and removing and cleaning the scaling test tube (402).
9. The method according to claim 8, wherein the step S2 comprises:
s21, opening a gas system (2), enabling nitrogen to enter a solution system (1), and deoxidizing a solution in the solution system (1);
step S22, the time of the deoxidization process is at least 30 minutes;
s23, closing the gas system (2), and discharging nitrogen in the solution system (1) and performing harmless treatment;
s24, replacing a gas source of the gas system (2) with medium gas mixed by carbon dioxide and nitrogen from nitrogen, and opening the gas system (2) to enable the medium gas to enter the solution system (1);
step S25, introducing medium gas for at least 30 minutes;
and S26, closing the gas system (2), and discharging the medium gas in the solution system (1) and performing harmless treatment.
10. The method according to claim 8 or 9, wherein the step S4 is specifically:
step S41, a data system (5) measures the temperature in a scaling test tube (402);
step S42, a first pressure sensor (501) monitors the pressure of the inner cavity of the scaling test tube (402) when the solutions are just mixed, a second pressure sensor (502) monitors the pressure of the inner cavity of the scaling test tube (402) after the solutions are completely mixed, and the pressure difference is calculated through the two monitoring values;
and step S43, transmitting the temperature and pressure difference values to a data system (5), and storing, counting and analyzing the collected data by the data system (5) and feeding back the result to a tester.
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| CN117685508A (en) * | 2023-12-12 | 2024-03-12 | 山东容和节能环保科技有限公司 | Intelligent monitoring system and method for industrial circulating water treatment based on cloud platform Internet of things |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117685508A (en) * | 2023-12-12 | 2024-03-12 | 山东容和节能环保科技有限公司 | Intelligent monitoring system and method for industrial circulating water treatment based on cloud platform Internet of things |
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