CN107806847B - Corrosion inhibitor pre-film thickness testing device and method - Google Patents
Corrosion inhibitor pre-film thickness testing device and method Download PDFInfo
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- CN107806847B CN107806847B CN201711015622.1A CN201711015622A CN107806847B CN 107806847 B CN107806847 B CN 107806847B CN 201711015622 A CN201711015622 A CN 201711015622A CN 107806847 B CN107806847 B CN 107806847B
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- G01B21/02—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring length, width, or thickness
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Abstract
The invention relates to a corrosion inhibitor pre-film thickness testing device and a method, which belong to the technical field of oil-gas ground gathering and transportation, simulate the actual flow condition in a pipe on site, and design a temperature and pressure regulating system, a horizontal pipe section testing system, an elbow testing system, a fluctuating pipe section testing system, a ball receiving system, a ball serving system, a corrosion inhibitor filling system and the like so as to provide a means for testing the corrosion inhibitor pre-film thickness; designing a film thickness monitoring sheet processing operation flow, a corrosion inhibitor pre-film operation flow and the like, and analyzing the pre-film quality by measuring the thickness of the corrosion inhibitor film on the film thickness monitoring sheet after each pre-film. According to the corrosion inhibitor pre-film thickness testing device and method, the influence of factors such as different ball pushing air quantities, ball pushing pressures, elbows with different angles, pipeline waviness, different corrosion inhibitor filling quantities, types, temperatures, corrosion inhibitor and diesel oil proportion on the corrosion inhibitor pre-film thickness can be analyzed through a loop test, the pre-film operation process is optimized, and the pre-film quality is evaluated.
Description
Technical Field
The invention relates to a corrosion inhibitor pre-film thickness testing device and method, and belongs to the technical field of oil and gas ground gathering and transportation.
Background
The high-sulfur gas field adopts a moisture gathering and transporting process, can face the risk of internal corrosion, cause the damage of pipelines and equipment, and reduce the service life of the equipment and the pipelines, and the currently effective anticorrosion means comprises the following steps: the corrosion inhibitor is prepared by selecting a hydrogen sulfide resistant material, adding a corrosion inhibitor, a corrosion inhibitor pre-film, an inner coating and the like, wherein the corrosion inhibitor pre-film operation is performed regularly, and the corrosion prevention effect is good.
The corrosion inhibitor pre-film thickness directly influences the corrosion prevention effect, and a plurality of factors on site influence the corrosion inhibitor pre-film thickness, including: the cleaning degree of the inner wall of the pipeline, the concentration of the corrosion inhibitor, the filling amount of the corrosion inhibitor, the pre-filming time and the like. In order to improve the quality of the corrosion inhibitor pre-film, the influence of various factors on the thickness of the pre-film needs to be researched. At present, researches on influence factors of pre-film thickness in published documents are carried out in a laboratory stage by adopting a loop which is much smaller than the diameter of an actual pipeline, and the research methods cannot truly reflect the condition in a field pipe and have certain limitations. Meanwhile, a corrosion detection mode is often adopted when the thickness of the pre-film is analyzed, and the conventional hanging piece can influence the pre-film ball pushing operation. Therefore, the corrosion inhibitor pre-film thickness testing device and method provided by the invention are used for comprehensively analyzing factors influencing the pre-film quality of the gathering and transportation pipeline of the high-sulfur-content gas field from the height of ensuring the safe transportation of the pipeline, so that the purpose of controlling the corrosion in the gathering and transportation pipeline is achieved by taking the pre-film quality as a means of improving the pre-film quality. Meanwhile, a basis is provided for optimizing the corrosion inhibitor pre-film operation process.
Therefore, by researching factors influencing the thickness of the pre-film, the corrosion inhibitor concentration, the corrosion inhibitor filling concentration, the pre-film time and the like during pre-film operation are optimized, the pre-film quality is improved, the corrosion rate in the pipeline is reduced, the method has important practical significance, and meanwhile, the remarkable economic benefit can be generated by optimizing the corrosion inhibitor filling amount and the corrosion inhibitor concentration.
Disclosure of Invention
The invention aims to provide a corrosion inhibitor pre-film thickness testing device and a corrosion inhibitor pre-film thickness testing method, so that factors influencing the corrosion inhibitor and the pre-film thickness can be better researched, the pre-film operation process is optimized, the corrosion rate of a pipeline is reduced, and the safe and stable operation of a wet natural gas gathering and transportation pipeline of an acid gas field is ensured.
The invention mainly solves the following problems: 1. designing a processing operation flow of the film thickness detection sheet, and analyzing the thickness of the pre-film by researching the distribution condition of the corrosion inhibitor on the film thickness detection sheet after each pre-film; 2. a corrosion inhibitor pre-film operation flow is established, the operation flow of a loop test is standardized, and the safe and accurate test is ensured; 3. designing a temperature and pressure regulating system, a horizontal pipe section testing system, an elbow testing system, a fluctuating pipe section testing system and a corrosion inhibitor filling system, and researching the influence of factors such as the filling amount, concentration, type, temperature, ball pushing amount, elbows with different angles, pipeline fluctuation and the like of a corrosion inhibitor on the thickness of a corrosion inhibitor pre-film through a loop test; 4. and (3) providing a film thickness detection sheet processing method, and analyzing the pre-film effect by a copper sulfate solution soaking method and a dichloromethane solution cleaning method.
In order to achieve the above object, the present invention has the following technical means.
A corrosion inhibitor pre-film thickness testing method comprises the following steps:
s1, corrosion inhibitor pretreatment:
s101, opening a sewage pipeline 501, and removing residual liquid in a corrosion inhibitor storage tank 505;
s102, closing a sewage drainage pipeline 501, opening an air release valve 506, injecting a corrosion inhibitor into a corrosion inhibitor storage tank 505 through a loading circulation pipeline 502 or a corrosion inhibitor tank truck 503, and observing readings of a pressure gauge 507 and a liquid level meter 508 of the corrosion inhibitor tank;
s103, starting the high-pressure pump 509, and injecting the corrosion inhibitor into the temperature control tank 510;
s104, opening an external diesel injection valve 514, and injecting a proper amount of diesel into a diesel tank 515;
s105, starting a diesel oil filling pump 516 to fill diesel oil into the temperature control tank 510;
s106, controlling the proportion of the corrosion inhibitor and the diesel oil entering the temperature control tank 510 by observing the corrosion inhibitor flowmeter 512 and the diesel oil flowmeter 517;
s107, opening an electric stirrer positioned at the top of the temperature control tank 510 to ensure that the corrosion inhibitor and the diesel oil are uniformly mixed.
S2, processing the film thickness detection sheet 19 according to the film thickness detection sheet processing flow, wherein the film thickness detection sheet processing flow is as follows:
q1, processing a special hanging piece, wherein the hanging piece is made of L360QS and is arc-shaped, and the radian of the hanging piece is consistent with that of the pipeline hole;
q2, polishing the film thickness detection sheet 19 to 1000# step by using sand paper until the surface is uniform and smooth;
q3, putting into acetone solution to remove oil;
q4, putting into absolute ethyl alcohol for degreasing;
q5, placing the film thickness detection piece 19 into deionized water for washing, and drying;
q6, reserving a surface which is in direct contact with the pipe cleaner as a test surface, and sealing the rest surfaces with epoxy resin;
q7, numbering the cleaned film thickness test pieces 19, then weighing to the nearest 0.1mg, measuring, calculating the hanger size, calculating its surface area and recording data.
S3, hanging 2 film thickness detection pieces 19 at a first test point 191, a second test point 192, a third test point 193, a fourth test point 194 and a fifth test point 18 respectively, wherein the numbers of the detection pieces are A, B;
s4, emptying, zero setting of the instrument: before the test is started, a fuel gas pipeline main valve 1202 and a fuel gas valve 1203 are opened, fuel gas is blown into a test loop to run for about half an hour, air in the loop is exhausted, and a pressure sensor 15 and a temperature sensor 16 on the loop are zeroed;
s5, adjusting the temperature and pressure of the sour gas:
s51, opening the main valve 1202 of fuel gas pipeline and the valve 1206 of heating furnace, making the fuel gas enter the heating furnace 1207 for burning consumption;
s52, opening the bypass valve 1211, and controlling the opening of the first throttle 1208, the second throttle 1209, and the third throttle 1210;
s53, opening a main valve 1202 of the fuel gas pipeline, and introducing the acid gas with the pressure and temperature adjusted into a test loop through an acid gas pipe 1212;
and S6, launching a pipe cleaner according to the pipe cleaner ball launching operation flow, and cleaning the sundries in the test loop.
And S7, receiving the pipe pig according to the pipe pig ball receiving operation flow.
S8, establishing a corrosion inhibitor pre-film operation flow, and performing corrosion inhibitor pre-film operation, wherein the corrosion inhibitor pre-film operation flow comprises the following steps:
m1, field process flow confirmation: confirming that the corrosion inhibitor overflow port 106, the third one-way valve 107, the corrosion inhibitor filling valve 108, the fourth one-way valve 109, the emptying pipeline valve 1010, the fifth one-way valve 1011, the ball-sending emptying valve 1016, the bypass pipe valve 1019, the balance valve 105 at the large and small head 1020 and the first ball-sending valve 101, the second ball-sending valve 102, the third ball-sending valve 103 and the fourth ball-sending valve 104 on the straight pipe section 1017 are closed;
m2, guiding the pig in place:
m21, opening the blind plate, spraying clear water into the spherical barrel, and collecting sewage;
m22, performing operation and maintenance of the blind plate: checking a sealing ring and coating butter;
m23, pushing the pipe cleaner into the large head and the small head 1020 by using an explosion-proof ball launching rod, and determining that the sealing performance is good;
m24, closing a blind plate;
m25, opening a ball serving and emptying valve 1016;
m26, opening a fuel gas valve 1203 for purging, and purifying residual gas;
m27, when the oxygen content is lower than 2%, closing the fuel gas valve 1203 and closing the ball-sending vent valve 1016;
m3, corrosion inhibitor filling operation:
m31, closing the second ball valve 102;
m32, opening the corrosion inhibitor filling valve 108;
m33, opening a filling valve 511 and starting a filling pump 513;
m34, closing the corrosion inhibitor filling valve 108 after the filling is finished;
m4, film coating pig positioning operation:
m41, opening a blind plate;
m42, pushing the film coating pipe cleaner into the large head and the small head by using an explosion-proof ball launching rod, and determining that the sealing performance is good;
m43, closing a blind plate;
m44, opening a fuel gas valve 1203 for purging, and purifying residual gas;
m45, closing fuel valve 1203 when oxygen content is below 2%;
m46, observing pressure, and establishing 0.6MPa pressure at the rear end of the coating pipe cleaner by using fuel gas;
m47, slowly opening the corrosion inhibitor overflow port 106 to full open, and discharging gas between the liquid level and the pipe wall;
m48, when the gas is not discharged, closing the corrosion inhibitor overflow port 106;
m5, sending a pre-membrane pig:
m51, opening a bypass pipe valve 1019 and a ball serving air inlet valve 1012I, and introducing acid gas into a ball serving barrel;
m52, opening a first ball valve 101, a third ball valve 103 and a fourth ball valve 104 on the straight pipe section 1017, and introducing acid gas until the pressure is balanced;
m53, opening the second ball valve 102 after the pressure is stable;
m54, closing the ball serving air inlet valve I1012, serving and informing a ball receiving end;
m6, flow recovery job:
m61, confirming that the pig is out of the station, and fully opening a ball serving air inlet valve 1018 II;
m62, closing a first ball valve 101, a second ball valve 102, a third ball valve 103 and a fourth ball valve 104 on the straight pipe section 1017, and closing a ball valve inlet valve 1018 II;
m63, opening a ball-serving air-release valve 1016 for releasing air;
m64, opening a fuel gas valve 1203 for purging, and purifying residual gas;
m65, detecting the concentration and the oxygen content of the hydrogen sulfide at a large-range pressure gauge vent port by using a multifunctional gas detector;
m66, closing the fuel gas valve 1203 and the ball-serving vent valve 1016 when the hydrogen sulfide content is lower than 20ppm and the oxygen content is lower than 2%;
m67, observing the reading condition of the pressure gauge, opening the manual emptying valve, emptying the gas until the pressure is zero, and closing the manual emptying valve;
m68, confirming that the main line flow and the service flow are switched, and finishing the pre-filming service operation.
And S9, receiving the pre-membrane pig according to the pig ball receiving operation flow.
S10, taking out 10 film thickness detection pieces 19 arranged at the first test point 191, the second test point 192, the third test point 193, the fourth test point 194 and the fifth test point 18, and dividing into 2 groups, wherein the first group comprises the film thickness detection pieces 19 with the number of A in 5 test points, and the second group comprises the film thickness detection pieces 19 with the number of B in 5 test points.
S11, respectively putting the 5 film thickness detection sheets 19 in the group A into 1% copper sulfate solution, soaking for 10 seconds, immediately putting into hydrochloric acid solution with the pH value of 2-3, observing a copper coating on the test sheet, judging the film forming effect according to the area of the surface of the test sheet replaced by Cu, wherein the smaller the area of the surface replaced by Cu, the more complete the corrosion inhibitor adsorption film is.
S12, respectively placing the 5 film thickness detection pieces 19 in the group B into a metering cylinder containing a dichloromethane solution, taking out the film thickness detection pieces 19 after a period of time, removing dichloromethane in the metering cylinder by using a rotary evaporator, placing the solution from which dichloromethane is removed on an aluminum plate weighed in advance, placing the aluminum plate into a vacuum oven at 50 ℃, drying, weighing the aluminum plate again, wherein the obtained weight difference is the weight of the corrosion inhibitor, calculating the corrosion inhibitor dosage on the surface of each square centimeter of the film thickness detection pieces 19 according to the area of the film thickness detection pieces 19, and calculating the film thickness of the corrosion inhibitor according to the density of the corrosion inhibitor.
S13, disassembling the first elbow testing system 11, the second elbow testing system 14 and the third elbow testing system 20 for treatment, and testing the pre-film thickness of the corrosion inhibitor at the horizontal elbows with different angles in an experiment.
S14, controlling the ratio of the corrosion inhibitor to the diesel oil entering the temperature control tank 510, repeating the steps S2-S12, and testing the thickness of the corrosion inhibitor pre-film in the loop under the working conditions of different corrosion inhibitor concentrations.
S15, when adding corrosion inhibitor, closing the second ball valve 102, the third ball valve 103 and the fourth ball valve 104 respectively when adding corrosion inhibitor, repeating the steps S2-S12, and testing the thickness of the corrosion inhibitor pre-film in the ring road under the working conditions of different corrosion inhibitor adding amounts.
S16, changing the corrosion inhibitor type entering the temperature control tank 510, repeating the steps S2-S12, and testing the pre-film thickness of the corrosion inhibitor in the loop under the working conditions of different corrosion inhibitor types.
S17, changing the temperature of the temperature control tank 510, repeating the steps S2-S12, and testing the thickness of the corrosion inhibitor pre-film in the loop under the working conditions of different corrosion inhibitor temperatures.
S18, changing the opening degrees of the first throttle valve 1208, the second throttle valve 1209 and the third throttle valve 1210, repeating the steps S2-S12, and testing the thickness of the corrosion inhibitor pre-film in the loop under the working conditions of different ball pushing gas amounts.
S19, changing the undulation degree of the pipe section of the undulation pipe section testing system 17, and testing the thickness of the corrosion inhibitor pre-film in the circular path under different pipe undulation degree working conditions.
Further, a corrosion inhibitor prefilming thickness testing arrangement, its characterized in that: the device comprises a fuel gas pipeline 1, an acid gas pipeline 2, a reflux valve 3, a gas-water separator 4, a corrosion inhibitor filling system 5, a sewage treatment system 6, an emptying safety valve 7, an emptying pipeline 8, a ball receiving system 9, a ball serving system 10, a first elbow testing system 11, a temperature and pressure regulating system 12, a horizontal pipe section testing system 13, a second elbow testing system 14, a pressure sensor 15, a temperature sensor 16, a fluctuating pipe section testing system 17, a fifth testing point 18, a film thickness detecting sheet 19 and a third elbow testing system 20;
the temperature and pressure regulating system 12 is connected with a fuel gas pipeline 1, an acid gas pipeline 2 and a ball serving system 10, the horizontal pipe section testing system 13, the second elbow testing system 14, the fluctuating pipe section testing system 17, the first elbow testing system 11, the third elbow testing system 20 and the ball receiving system 9 are sequentially connected, the first testing point 191, the second testing point 192, the third testing point 193, the fourth testing point 194, the fifth testing point 18, the pressure sensor 15 and the temperature sensor 16 are distributed on a testing loop, the ball receiving system 9 is connected with the emptying pipeline 8, the gas-water separator 4 and the sewage treatment system 6, the gas-water separator 4 is connected with the acid gas pipeline 2, and the corrosion inhibitor filling system 5 is connected with the ball serving system 10.
Further, the temperature and pressure regulating system 12 includes: a sour gas line main valve 1201, a fuel gas line main valve 1202, a fuel gas valve 1203, a sour gas flow meter 1204, a fuel gas pressure regulating cabinet 1205, a heating furnace inlet valve 1206, a heating furnace 1207, a third throttle valve 1208, a second throttle valve 1209, a first throttle valve 1210, a bypass valve 1211, a sour gas pipe 1212 and a fuel gas pipe 1213.
The bypass valve 1211, the first throttle valve 1210, the second throttle valve 1209, the third throttle valve 1208 and the heating furnace 1207 are connected in sequence, the sour gas flow meter 1204 and the sour gas pipeline main valve 1201 are installed on the sour gas pipe 1212, the fuel gas enters the fuel gas pressure regulating cabinet 1205 from the fuel gas pipe 1213 through the fuel gas pipeline main valve 1202, a part of the fuel gas enters the heating furnace 1207 through the heating furnace valve 1206, and a part of the fuel gas enters the fuel gas pipe 1213 through the fuel gas valve 1203.
Further, the ball serving system 10 includes: the device comprises a first ball-sending valve 101, a second ball-sending valve 102, a third ball-sending valve 103, a fourth ball-sending valve 104, a balance valve 105, a corrosion inhibitor overflow port 106, a third one-way valve 107, a corrosion inhibitor filling valve 108, a fourth one-way valve 109, a vent line valve 1010, a fifth one-way valve 1011, a ball-sending air inlet valve I1012, a ball-sending pressure sensor 1013, a ball-sending temperature sensor 1014, a ball-sending barrel 1015, a ball-sending vent valve 1016, a straight pipe section 1017, a ball-sending air inlet valve 1018 II, a bypass pipe valve 1019, an reducer 1020 and a ball-sending tee 1021.
The ball serving barrel 1015 is installed at the initial position of the test loop, the tail part is connected with a ball serving emptying valve 1016, the head part is a large head 1020, the middle part is provided with a ball serving pressure sensor 1013 and a ball serving temperature sensor 1014, the balance valve 105 is connected with the large head 1020 and the ball serving barrel 1015 through pipelines, the second ball serving valve 102, the third ball serving valve 103, the fourth ball serving valve 104 and the first ball serving valve 101 are sequentially installed on the straight pipe section 1017, the corrosion inhibitor overflow port 106, the third one-way valve 107, the corrosion inhibitor filling valve 108, the fourth one-way valve 109, the emptying pipeline valve 1010 and the fifth one-way valve 1011 are positioned on the left side of the first ball serving valve 101, the ball serving air inlet valve 1018 II is connected with the bypass pipe valve 1019 and the ball serving air inlet valve I1012 through pipelines, and the ball serving tee 1021 is positioned on.
Further, the ball collecting system 9 includes: the device comprises an air inlet valve 91, a ball collecting valve 92, a first valve 93, a second valve 94, an air outlet valve 95, a first one-way valve 96, a residual liquid discharge valve 97, a second one-way valve 98, a residual corrosion inhibitor discharge valve 99, a safety valve 910, a ball collecting barrel 911, a fuel air valve 912, a cleaning pipe tee 913, a corrosion inhibitor collecting barrel 914 and a corrosion inhibitor discharge port 915.
The ball collecting barrel 911 is positioned at the tail of the test loop, the safety valve 910, the first check valve 96, the residual liquid discharge valve 97, the second check valve 98 and the residual corrosion inhibitor discharge valve 99 are arranged at the tail of the ball collecting barrel 911, the residual liquid discharge valve 97 is connected with the sewage treatment system 6 through pipelines, the residual corrosion inhibitor discharge valve 99 is connected with the corrosion inhibitor discharge port 915 through a pipeline, the corrosion inhibitor discharge port 915 is externally connected with a corrosion inhibitor collecting barrel 914, the first valve 93 and the second valve 94 are arranged at the head of the ball collecting barrel 911, the pigging tee 913 is connected with the air inlet valve 91, the ball collecting valve 92 and the air outlet valve 95, and the pipeline passing through the fuel air valve 912 is arranged between the ball collecting valve 92 and the ball collecting barrel 911.
Further, the corrosion inhibitor filling system 5 includes: the corrosion inhibitor tank truck comprises a sewage discharge pipeline 501, a loading circulation pipeline 502, a corrosion inhibitor tank truck 503, a corrosion inhibitor pump 504, a corrosion inhibitor storage tank 505, an emptying valve 506, a corrosion inhibitor tank pressure gauge 507, a liquid level meter 508, a high-pressure pump 509, a temperature control tank 510, a filling valve 511, a corrosion inhibitor flow meter 512, a filling pump 513, an external diesel oil filling valve 514, a diesel oil tank 515, a diesel oil filling pump 516, a diesel oil flow meter 517 and a mixing flow meter 518.
The corrosion inhibitor in the corrosion inhibitor storage tank 505 can be filled through a loading circulation pipeline 502 or can be filled through a corrosion inhibitor tank truck 503 through a corrosion inhibitor pump 504, impurities in the corrosion inhibitor storage tank 505 can be discharged through a sewage discharge pipeline 501, a liquid level meter 508, a corrosion inhibitor tank pressure gauge 507 and an air release valve 506 are installed on the corrosion inhibitor storage tank 505, a high-pressure pump 509 is connected with the corrosion inhibitor storage tank 505 and a corrosion inhibitor flowmeter 512 through pipelines, a diesel oil tank 515 is connected with a temperature control tank 510, a diesel oil filling pump 516 and a diesel oil flowmeter 517 are installed on the pipelines, diesel oil is filled into the diesel oil tank 515 through an external diesel oil valve 514, and a mixture of the diesel oil and the corrosion inhibitor enters the ball serving system 10 through a filling pump 513 through a filling valve 511 and a.
The invention has the beneficial effects that:
(1) the invention mainly aims at a gathering and transportation system of a high-sulfur-content gas field, designs a corrosion inhibitor pre-film thickness testing device and a corrosion inhibitor pre-film thickness testing method, researches the influence of factors such as corrosion inhibitor filling amount, concentration, type, temperature, ball pushing amount, elbows with different angles, pipeline undulation degree and the like on the corrosion inhibitor pre-film quality through a loop test, optimizes a pre-film operation process and reduces the pipeline corrosion rate.
(2) Designing a film thickness detection sheet, formulating a processing operation flow of the film thickness detection sheet, and analyzing the pre-film thickness by researching the distribution condition of the corrosion inhibitor on the film thickness detection sheet after each pre-film.
(3) By formulating a corrosion inhibitor pre-filming operation flow, the operation flow of a loop test is standardized, and the safe and accurate test is ensured.
(4) The film thickness detection piece processing method is provided, and the pre-film effect can be analyzed through a copper sulfate solution soaking method and a dichloromethane solution cleaning method.
Drawings
FIG. 1 is a schematic view of a loop test apparatus according to an embodiment of the present invention.
Fig. 2 is a schematic view of a ball serving system in an embodiment of the present invention.
FIG. 3 is a schematic diagram of a ball collection system in an embodiment of the invention.
FIG. 4 is a schematic view of a corrosion inhibitor filling system according to an embodiment of the invention.
Figure 5 is a schematic view of a 10 deg. undulation of a pipe in an embodiment of the present invention.
Figure 6 is a 30 deg. elevation schematic of a pipe in an embodiment of the invention.
Figure 7 is a schematic view of a 60 deg. undulation of a conduit in an embodiment of the present invention.
Detailed Description
The following description of specific embodiments of the present invention is provided in order to better understand the present invention with reference to the accompanying drawings.
Examples
In this embodiment, the device is intended to be installed in a by-pass line on a section of pipeline in the field.
As shown in a schematic diagram of a loop test device in fig. 1, a corrosion inhibitor pre-film thickness test device comprises a fuel gas pipeline 1, an acid gas pipeline 2, a reflux valve 3, a gas-water separator 4, a corrosion inhibitor filling system 5, a sewage treatment system 6, an emptying safety valve 7, an emptying pipeline 8, a ball receiving system 9, a ball serving system 10, a first elbow test system 11, a temperature and pressure adjusting system 12, a horizontal pipe section test system 13, a second elbow test system 14, a pressure sensor 15, a temperature sensor 16, a fluctuating pipe section test system 17, a fifth test point 18, a film thickness detection sheet 19 and a third elbow test system 20;
the temperature and pressure regulating system 12 is connected with a fuel gas pipeline 1, an acid gas pipeline 2 and a ball serving system 10, the horizontal pipe section testing system 13, the second elbow testing system 14, the fluctuating pipe section testing system 17, the first elbow testing system 11, the third elbow testing system 20 and the ball receiving system 9 are sequentially connected, the first testing point 191, the second testing point 192, the third testing point 193, the fourth testing point 194, the fifth testing point 18, the pressure sensor 15 and the temperature sensor 16 are distributed on a testing loop, the ball receiving system 9 is connected with the emptying pipeline 8, the gas-water separator 4 and the sewage treatment system 6, the gas-water separator 4 is connected with the acid gas pipeline 2, and the corrosion inhibitor filling system 5 is connected with the ball serving system 10.
The temperature and pressure regulating system 12 includes: a sour gas line main valve 1201, a fuel gas line main valve 1202, a fuel gas valve 1203, a sour gas flow meter 1204, a fuel gas pressure regulating cabinet 1205, a heating furnace inlet valve 1206, a heating furnace 1207, a third throttle valve 1208, a second throttle valve 1209, a first throttle valve 1210, a bypass valve 1211, a sour gas pipe 1212 and a fuel gas pipe 1213.
The bypass valve 1211, the first throttle valve 1210, the second throttle valve 1209, the third throttle valve 1208 and the heating furnace 1207 are connected in sequence, the sour gas flow meter 1204 and the sour gas pipeline main valve 1201 are installed on the sour gas pipe 1212, the fuel gas enters the fuel gas pressure regulating cabinet 1205 from the fuel gas pipe 1213 through the fuel gas pipeline main valve 1202, a part of the fuel gas enters the heating furnace 1207 through the heating furnace valve 1206, and a part of the fuel gas enters the fuel gas pipe 1213 through the fuel gas valve 1203.
A corrosion inhibitor pre-film thickness testing method comprises the following steps:
s1, corrosion inhibitor pretreatment:
s101, opening a sewage pipeline 501, and removing residual liquid in a corrosion inhibitor storage tank 505;
s102, closing a sewage drainage pipeline 501, opening an air release valve 506, injecting a corrosion inhibitor into a corrosion inhibitor storage tank 505 through a loading circulation pipeline 502 or a corrosion inhibitor tank truck 503, and observing readings of a pressure gauge 507 and a liquid level meter 508 of the corrosion inhibitor tank;
s103, starting the high-pressure pump 509, and injecting the corrosion inhibitor into the temperature control tank 510;
s104, opening an external diesel injection valve 514, and injecting a proper amount of diesel into a diesel tank 515;
s105, starting a diesel oil filling pump 516 to fill diesel oil into the temperature control tank 510;
s106, controlling the proportion of the corrosion inhibitor and the diesel oil entering the temperature control tank 510 by observing the corrosion inhibitor flowmeter 512 and the diesel oil flowmeter 517;
s107, opening an electric stirrer positioned at the top of the temperature control tank 510 to ensure that the corrosion inhibitor and the diesel oil are uniformly mixed.
S2, processing the film thickness detection sheet 19 according to the film thickness detection sheet processing flow, wherein the film thickness detection sheet processing flow is as follows:
q1, processing a special hanging piece, wherein the hanging piece is made of L360QS and is arc-shaped, and the radian of the hanging piece is consistent with that of the pipeline hole;
q2, polishing the film thickness detection sheet 19 to 1000# step by using sand paper until the surface is uniform and smooth;
q3, putting into acetone solution to remove oil;
q4, putting into absolute ethyl alcohol for degreasing;
q5, placing the film thickness detection piece 19 into deionized water for washing, and drying;
q6, reserving a surface which is in direct contact with the pipe cleaner as a test surface, and sealing the rest surfaces with epoxy resin;
q7, numbering the cleaned film thickness test pieces 19, then weighing to the nearest 0.1mg, measuring, calculating the hanger size, calculating its surface area and recording data.
S3, hanging 2 film thickness detection pieces 19 at a first test point 191, a second test point 192, a third test point 193, a fourth test point 194 and a fifth test point 18 respectively, wherein the numbers of the detection pieces are A, B;
s4, emptying, zero setting of the instrument: before the test is started, a fuel gas pipeline main valve 1202 and a fuel gas valve 1203 are opened, fuel gas is blown into a test loop to run for about half an hour, air in the loop is exhausted, and a pressure sensor 15 and a temperature sensor 16 on the loop are zeroed;
s5, adjusting the temperature and pressure of the sour gas:
s51, opening the main valve 1202 of fuel gas pipeline and the valve 1206 of heating furnace, making the fuel gas enter the heating furnace 1207 for burning consumption;
s52, opening the bypass valve 1211, and controlling the opening of the first throttle 1208, the second throttle 1209, and the third throttle 1210;
s53, opening a main valve 1202 of the fuel gas pipeline, and introducing the acid gas with the pressure and temperature adjusted into a test loop through an acid gas pipe 1212;
and S6, launching a pipe cleaner according to the pipe cleaner ball launching operation flow, and cleaning the sundries in the test loop.
And S7, receiving the pipe pig according to the pipe pig ball receiving operation flow.
S8, establishing a corrosion inhibitor pre-film operation flow, and performing corrosion inhibitor pre-film operation, wherein the corrosion inhibitor pre-film operation flow comprises the following steps:
m1, field process flow confirmation: confirming that the corrosion inhibitor overflow port 106, the third one-way valve 107, the corrosion inhibitor filling valve 108, the fourth one-way valve 109, the emptying pipeline valve 1010, the fifth one-way valve 1011, the ball-sending emptying valve 1016, the bypass pipe valve 1019, the balance valve 105 at the large and small head 1020 and the first ball-sending valve 101, the second ball-sending valve 102, the third ball-sending valve 103 and the fourth ball-sending valve 104 on the straight pipe section 1017 are closed;
m2, guiding the pig in place:
m21, opening the blind plate, spraying clear water into the spherical barrel, and collecting sewage;
m22, performing operation and maintenance of the blind plate: checking a sealing ring and coating butter;
m23, pushing the pipe cleaner into the large head and the small head 1020 by using an explosion-proof ball launching rod, and determining that the sealing performance is good;
m24, closing a blind plate;
m25, opening a ball serving and emptying valve 1016;
m26, opening a fuel gas valve 1203 for purging, and purifying residual gas;
m27, when the oxygen content is lower than 2%, closing the fuel gas valve 1203 and closing the ball-sending vent valve 1016;
m3, corrosion inhibitor filling operation:
m31, closing the second ball valve 102;
m32, opening the corrosion inhibitor filling valve 108;
m33, opening a filling valve 511 and starting a filling pump 513;
m34, closing the corrosion inhibitor filling valve 108 after the filling is finished;
m4, film coating pig positioning operation:
m41, opening a blind plate;
m42, pushing the film coating pipe cleaner into the large head and the small head by using an explosion-proof ball launching rod, and determining that the sealing performance is good;
m43, closing a blind plate;
m44, opening a fuel gas valve 1203 for purging, and purifying residual gas;
m45, closing fuel valve 1203 when oxygen content is below 2%;
m46, observing pressure, and establishing 0.6MPa pressure at the rear end of the coating pipe cleaner by using fuel gas;
m47, slowly opening the corrosion inhibitor overflow port 106 to full open, and discharging gas between the liquid level and the pipe wall;
m48, when the gas is not discharged, closing the corrosion inhibitor overflow port 106;
m5, sending a pre-membrane pig:
m51, opening a bypass pipe valve 1019 and a ball serving air inlet valve I1012, and introducing acid gas into a ball serving barrel;
m52, opening a first ball valve 101, a third ball valve 103 and a fourth ball valve 104 on the straight pipe section 1017, and introducing acid gas until the pressure is balanced;
m53, opening the second ball valve 102 after the pressure is stable;
m54, closing the ball serving air inlet valve I1012, serving and informing a ball receiving end;
m6, flow recovery job:
m61, confirming that the pig is out of the station, and fully opening a ball serving air inlet valve 1018 II;
m62, closing a first ball valve 101, a second ball valve 102, a third ball valve 103 and a fourth ball valve 104 on the straight pipe section 1017, and closing a ball valve inlet valve 1018 II;
m63, opening a ball-serving air-release valve 1016 for releasing air;
m64, opening a fuel gas valve 1203 for purging, and purifying residual gas;
m65, detecting the concentration and the oxygen content of the hydrogen sulfide at a large-range pressure gauge vent port by using a multifunctional gas detector;
m66, closing the fuel gas valve 1203 and the ball-serving vent valve 1016 when the hydrogen sulfide content is lower than 20ppm and the oxygen content is lower than 2%;
m67, observing the reading condition of the pressure gauge, opening the manual emptying valve, emptying the gas until the pressure is zero, and closing the manual emptying valve;
and M68, confirming that the main line flow and the service flow are switched completely, and finishing batch service operation.
And S9, receiving the pre-membrane pig according to the pig ball receiving operation flow.
S10, taking out 10 film thickness detection pieces 19 arranged at the first test point 191, the second test point 192, the third test point 193, the fourth test point 194 and the fifth test point 18, and dividing into 2 groups, wherein the first group comprises the film thickness detection pieces 19 with the number of A in 5 test points, and the second group comprises the film thickness detection pieces 19 with the number of B in 5 test points.
S11, respectively putting the 5 film thickness detection sheets 19 in the group A into 1% copper sulfate solution, soaking for 10 seconds, immediately putting into hydrochloric acid solution with the pH value of 2-3, observing a copper coating on the test sheet, judging the film forming effect according to the area of the surface of the test sheet replaced by Cu, wherein the smaller the area of the surface replaced by Cu, the more complete the corrosion inhibitor adsorption film is.
S12, respectively placing the 5 film thickness detection pieces 19 in the group B into a metering cylinder containing a dichloromethane solution, taking out the film thickness detection pieces 19 after a period of time, removing dichloromethane in the metering cylinder by using a rotary evaporator, placing the solution from which dichloromethane is removed on an aluminum plate weighed in advance, placing the aluminum plate into a vacuum oven at 50 ℃, drying, weighing the aluminum plate again, wherein the obtained weight difference is the weight of the corrosion inhibitor, calculating the corrosion inhibitor dosage on the surface of each square centimeter of the film thickness detection pieces 19 according to the area of the film thickness detection pieces 19, and calculating the film thickness of the corrosion inhibitor according to the density of the corrosion inhibitor.
S13, disassembling the first elbow testing system 11, the second elbow testing system 14 and the third elbow testing system 20 for treatment, and testing the pre-film thickness of the corrosion inhibitor at the horizontal elbows with different angles in an experiment.
S14, controlling the ratio of the corrosion inhibitor to the diesel oil entering the temperature control tank 510, repeating the steps S2-S12, and testing the thickness of the corrosion inhibitor pre-film in the loop under the working conditions of different corrosion inhibitor concentrations.
S15, when adding corrosion inhibitor, closing the second ball valve 102, the third ball valve 103 and the fourth ball valve 104 respectively when adding corrosion inhibitor, repeating the steps S2-S12, and testing the thickness of the corrosion inhibitor pre-film in the ring road under the working conditions of different corrosion inhibitor adding amounts.
S16, changing the corrosion inhibitor type entering the temperature control tank 510, repeating the steps S2-S12, and testing the pre-film thickness of the corrosion inhibitor in the loop under the working conditions of different corrosion inhibitor types.
S17, changing the temperature of the temperature control tank 510, repeating the steps S2-S12, and testing the thickness of the corrosion inhibitor pre-film in the loop under the working conditions of different corrosion inhibitor temperatures.
S18, changing the opening degrees of the first throttle valve 1208, the second throttle valve 1209 and the third throttle valve 1210, repeating the steps S2-S12, and testing the thickness of the corrosion inhibitor pre-film in the loop under the working conditions of different ball pushing gas amounts.
S19, changing the undulation degree of the pipe section of the undulation pipe section testing system 17, and testing the thickness of the corrosion inhibitor pre-film in the circular path under different pipe undulation degree working conditions. As shown in the schematic view of the ball serving system of fig. 2, the ball serving system 10 includes: the device comprises a first ball-sending valve 101, a second ball-sending valve 102, a third ball-sending valve 103, a fourth ball-sending valve 104, a balance valve 105, a corrosion inhibitor overflow port 106, a third one-way valve 107, a corrosion inhibitor filling valve 108, a fourth one-way valve 109, a vent line valve 1010, a fifth one-way valve 1011, a ball-sending air inlet valve I1012, a ball-sending pressure sensor 1013, a ball-sending temperature sensor 1014, a ball-sending barrel 1015, a ball-sending vent valve 1016, a straight pipe section 1017, a ball-sending air inlet valve 1018 II, a bypass pipe valve 1019, an reducer 1020 and a ball-sending tee 1021.
The ball serving barrel 1015 is installed at the initial position of the test loop, the tail part is connected with a ball serving emptying valve 1016, the head part is a reducer 1020, the middle part is provided with a ball serving pressure sensor 1013 and a ball serving temperature sensor 1014, the balance valve 105 is connected with the reducer 1020 and the ball serving barrel 1015 through pipelines, the second ball serving valve 102, the third ball serving valve 103, the fourth ball serving valve 104 and the first ball serving valve 101 are sequentially installed on the straight pipe section 1017, the corrosion inhibitor overflow port 106, the third one-way valve 107, the corrosion inhibitor filling valve 108, the fourth one-way valve 109, the vent pipeline valve 1010 and the fifth one-way valve 1011 are positioned on the left side of the first ball serving valve 101, the ball serving air inlet valve 1018 II is connected with the bypass pipe valve 1019 and the ball serving air inlet valve I through pipelines, and the ball serving tee joint 1021 is positioned on the.
As shown in fig. 3, the ball collecting system 9 includes: the device comprises an air inlet valve 91, a ball collecting valve 92, a first valve 93, a second valve 94, an air outlet valve 95, a first one-way valve 96, a residual liquid discharge valve 97, a second one-way valve 98, a residual corrosion inhibitor discharge valve 99, a safety valve 910, a ball collecting barrel 911, a fuel air valve 912, a cleaning pipe tee 913, a corrosion inhibitor collecting barrel 914 and a corrosion inhibitor discharge port 915.
The ball collecting barrel 911 is positioned at the tail of the test loop, the safety valve 910, the first check valve 96, the residual liquid discharge valve 97, the second check valve 98 and the residual corrosion inhibitor discharge valve 99 are arranged at the tail of the ball collecting barrel 911, the residual liquid discharge valve 97 is connected with the sewage treatment system 6 through pipelines, the residual corrosion inhibitor discharge valve 99 is connected with the corrosion inhibitor discharge port 915 through a pipeline, the corrosion inhibitor discharge port 915 is externally connected with a corrosion inhibitor collecting barrel 914, the first valve 93 and the second valve 94 are arranged at the head of the ball collecting barrel 911, the cleaning pipe tee 913 is connected with the air inlet valve 91, the ball collecting valve 92 and the air outlet valve 95, and the pipelines passing through the fuel air valve 912 are arranged between the ball collecting valve 92 and the ball collecting barrel 911.
As shown in fig. 4, the corrosion inhibitor filling system 5 includes: the corrosion inhibitor tank truck comprises a sewage discharge pipeline 501, a loading circulation pipeline 502, a corrosion inhibitor tank truck 503, a corrosion inhibitor pump 504, a corrosion inhibitor storage tank 505, an emptying valve 506, a corrosion inhibitor tank pressure gauge 507, a liquid level meter 508, a high-pressure pump 509, a temperature control tank 510, a filling valve 511, a corrosion inhibitor flow meter 512, a filling pump 513, an external diesel oil filling valve 514, a diesel oil tank 515, a diesel oil filling pump 516, a diesel oil flow meter 517 and a mixing flow meter 518.
The corrosion inhibitor in the corrosion inhibitor storage tank 505 can be filled through a loading circulation pipeline 502 or can be filled through a corrosion inhibitor tank truck 503 through a corrosion inhibitor pump 504, impurities in the corrosion inhibitor storage tank 505 can be discharged through a sewage discharge pipeline 501, a liquid level meter 508, a corrosion inhibitor tank pressure gauge 507 and an air release valve 506 are installed on the corrosion inhibitor storage tank 505, a high-pressure pump 509 is connected with the corrosion inhibitor storage tank 505 and a corrosion inhibitor flowmeter 512 through pipelines, a diesel oil tank 515 is connected with a temperature control tank 510, a diesel oil filling pump 516 and a diesel oil flowmeter 517 are installed on the pipelines, diesel oil is filled into the diesel oil tank 515 through an external diesel oil valve 514, and a mixture of the diesel oil and the corrosion inhibitor enters the ball serving system 10 through a filling pump 513 through a filling valve 511 and a.
As shown in fig. 5, 6, and 7, the schematic diagrams of the test section of the fluctuating pipeline are that the pipeline can be pulled up by a steel wire rope at a certain angle, the steel wire rope passes through a fixed pulley, the fixed pulley is installed on a portal bracket, and the fluctuation degree of the pipeline can be 10 degrees, 30 degrees, and 60 degrees.
The foregoing is a preferred embodiment of the present invention, and it should be noted that modifications and adaptations can be made by those skilled in the art without departing from the principle of the present invention, and are intended to be within the scope of the present invention.
Claims (4)
1. A corrosion inhibitor pre-film thickness testing method comprises the following steps:
s1, corrosion inhibitor pretreatment:
s101, opening a sewage discharge pipeline (501), and removing residual liquid in a corrosion inhibitor storage tank (505);
s102, closing a sewage drainage pipeline (501), opening an emptying valve (506), injecting a corrosion inhibitor into a corrosion inhibitor storage tank (505) through a loading circulating pipeline (502) or a corrosion inhibitor tank truck (503), and observing readings of a pressure gauge (507) and a liquid level meter (508) of the corrosion inhibitor tank;
s103, starting a high-pressure pump (509), and injecting a corrosion inhibitor into a temperature control tank (510);
s104, opening an external diesel injection valve (514), and injecting a proper amount of diesel into a diesel tank (515);
s105, starting a diesel oil filling pump (516) to fill diesel oil into the temperature control tank (510);
s106, controlling the proportion of the corrosion inhibitor and the diesel oil entering the temperature control tank (510) by observing a corrosion inhibitor flowmeter (512) and a diesel oil flowmeter (517);
s107, opening an electric stirrer positioned at the top of the temperature control tank (510) to ensure that the corrosion inhibitor and the diesel oil are uniformly mixed;
s2, processing the film thickness detection sheet (19) according to the film thickness detection sheet processing work flow;
s3, respectively suspending 2 film thickness detection sheets (19) at a first test point (191), a second test point (192), a third test point (193), a fourth test point (194) and a fifth test point (18), wherein each sheet is numbered A, B;
s4, emptying, zero setting of the instrument: before the test is started, a main valve (1202) of a fuel gas pipeline and a fuel gas valve (1203) are opened, fuel gas is blown into a test loop to run for about half an hour, air in the loop is exhausted, and a pressure sensor (15) and a temperature sensor (16) on the loop are zeroed;
s5, adjusting the temperature and pressure of the sour gas:
s51, opening a main valve (1202) of a fuel gas pipeline and a valve (1206) of a heating furnace to enable fuel gas to enter the heating furnace (1207) for combustion consumption;
s52, opening a bypass valve (1211) and controlling the opening degrees of a first throttle valve (1208), a second throttle valve (1209) and a third throttle valve (1210);
s53, opening a main valve (1202) of the fuel gas pipeline, and introducing the acid gas after pressure and temperature regulation into a test loop through an acid gas pipe (1212);
s6, launching a pipe cleaner according to the pipe cleaner ball launching operation flow, and cleaning sundries in the test loop;
s7, receiving a pipe cleaner according to the pipe cleaner ball collecting operation flow;
s8, making a corrosion inhibitor pre-film operation flow and performing corrosion inhibitor pre-film operation;
s9, receiving a pre-membrane pipe cleaner according to the pipe cleaner ball collecting operation flow;
s10, taking out 10 film thickness detection pieces (19) arranged at a first test point (191), a second test point (192), a third test point (193), a fourth test point (194) and a fifth test point (18), and dividing the 10 film thickness detection pieces into 2 groups, wherein the first group comprises the film thickness detection piece (19) with the number of A in 5 test points, and the second group comprises the film thickness detection piece (19) with the number of B in 5 test points;
s11, respectively putting 5 film thickness detection sheets (19) of the group A into 1% copper sulfate solution, soaking for 10 seconds, immediately putting into hydrochloric acid solution with the pH value of 2-3, observing a copper coating on the test sheet, judging the film forming effect according to the area of the surface of the test sheet replaced by Cu, wherein the less the area of the surface replaced is, the more complete the corrosion inhibitor adsorption film is;
s12, respectively placing 5 film thickness detection pieces (19) of the group B into a metering cylinder containing a dichloromethane solution, taking out the film thickness detection pieces (19) after a period of time, removing dichloromethane in the metering cylinder by using a rotary evaporator, placing the solution from which dichloromethane is removed on an aluminum plate with the weight weighed in advance, placing the aluminum plate into a vacuum oven at 50 ℃, weighing the aluminum plate again after drying, wherein the obtained weight difference is the weight of the corrosion inhibitor, calculating the corrosion inhibitor dosage on the surface of each square centimeter of the film thickness detection pieces (19) according to the area of the film thickness detection pieces (19), and calculating the film thickness of the corrosion inhibitor according to the density of the corrosion inhibitor;
s13, disassembling the first elbow testing system (11), the second elbow testing system (14) and the third elbow testing system (20) for treatment, and testing the pre-film thickness of the corrosion inhibitor at horizontal elbows with different angles in an experiment;
s14, controlling the proportion of the corrosion inhibitor entering the temperature control tank (510) to the diesel oil, repeating the steps S2-S12, and testing the thickness of a corrosion inhibitor pre-film in the loop under the working conditions of different corrosion inhibitor concentrations;
s15, when adding corrosion inhibitor, closing the second ball valve (102), the third ball valve (103) and the fourth ball valve (104) respectively when adding corrosion inhibitor, repeating the steps S2-S12, and testing the thickness of a corrosion inhibitor pre-film in the ring channel under the working conditions of different corrosion inhibitor adding amounts;
s16, changing the type of the corrosion inhibitor entering the temperature control tank (510), repeating the steps S2-S12, and testing the pre-film thickness of the corrosion inhibitor in the loop under the working conditions of different corrosion inhibitor types;
s17, changing the temperature of the temperature control tank (510), repeating the steps S2-S12, and testing the thickness of the corrosion inhibitor pre-film in the loop under the working conditions of different corrosion inhibitor temperatures;
s18, changing the opening degrees of the first throttle valve (1208), the second throttle valve (1209) and the third throttle valve (1210), repeating the steps S2-S12, and testing the thickness of a corrosion inhibitor pre-film in the loop under the working conditions of different ball pushing gas amounts by a test;
s19, changing the pipe section undulation degree of the undulation pipe section test system (17), and testing the thickness of the corrosion inhibitor pre-film in the circular path under different pipe undulation degree working conditions.
2. The corrosion inhibitor prefilming thickness test method according to claim 1, characterized in that: the corrosion inhibitor pre-film operation process comprises the following steps:
m1, preparation before serve: confirming that a corrosion inhibitor overflow port (106), a third one-way valve (107), a corrosion inhibitor filling valve (108), a fourth one-way valve (109), a vent pipeline valve (1010), a fifth one-way valve (1011), a ball-sending vent valve (1016), a bypass pipe valve (1019), a balance valve (105) at a reducer (1020) and a first ball-sending valve (101), a second ball-sending valve (102), a third ball-sending valve (103) and a fourth ball-sending valve (104) on a straight pipe section (1017) are closed;
m2, guiding the pig in place:
m21, opening the blind plate, spraying clear water into the spherical barrel, and collecting sewage;
m22, performing operation and maintenance of the blind plate: checking a sealing ring and coating butter;
m23, pushing the pipe cleaner into the large head and the small head (1020) by using an explosion-proof ball launching rod, and determining that the sealing performance is good;
m24, closing a blind plate;
m25, opening a ball-serving vent valve (1016);
m26, opening a fuel gas valve (1203) for purging, and purifying residual gas;
m27, closing a fuel gas valve (1203) and closing a ball-sending vent valve (1016) when the oxygen content is lower than 2%;
m3, corrosion inhibitor filling operation:
m31, closing the second hairball valve (102);
m32, opening a corrosion inhibitor filling valve (108);
m33, opening a filling valve (511) and starting a filling pump (513);
m34, closing the corrosion inhibitor filling valve (108) after the filling is finished;
m4, film coating pig positioning operation:
m41, opening a blind plate;
m42, pushing the film coating pipe cleaner into the large head and the small head by using an explosion-proof ball launching rod, and determining that the sealing performance is good;
m43, closing a blind plate;
m44, opening a fuel gas valve (1203) for purging, and purifying residual gas;
m45, closing the fuel gas valve when the oxygen content is lower than 2 percent (1203);
m46, observing pressure, and establishing 0.6MPa pressure at the rear end of the coating pipe cleaner by using fuel gas;
m47, slowly opening the corrosion inhibitor overflow port (106) to full open, and discharging gas between the liquid level and the pipe wall;
m48, when the gas is not discharged, closing the corrosion inhibitor overflow port (106);
m5, sending a pre-membrane pig:
m51, opening a bypass pipe valve (1019), and a ball serving air inlet valve I (1012), and introducing acid gas into a ball serving barrel;
m52, opening a first ball valve (101), a third ball valve (103) and a fourth ball valve (104) on the straight pipe section (1017), and introducing acid gas until the pressure is balanced;
m53, opening a second ball valve (102) after the pressure is stable;
m54, closing the ball serving air inlet valve I (1012), serving and informing a ball receiving end;
m6, flow recovery job:
m61, confirming that the pig is out of the station, and fully opening a ball serving air inlet valve II (1018);
m62, closing a first ball valve (101), a second ball valve (102), a third ball valve (103) and a fourth ball valve (104) on the straight pipe section (1017), and closing a ball inlet valve II (1018);
m63, opening a ball-serving air-release valve (1016) for releasing air;
m64, opening a fuel gas valve (1203) for purging, and purifying residual gas;
m65, detecting the concentration and the oxygen content of the hydrogen sulfide at a large-range pressure gauge vent port by using a multifunctional gas monitor;
m66, closing a fuel gas valve (1203) and a ball-serving vent valve (1016) when the hydrogen sulfide content is lower than 20ppm and the oxygen content is lower than 2%;
m67, observing the reading condition of the pressure gauge, opening the manual emptying valve, emptying the gas until the pressure is zero, and closing the manual emptying valve;
m68, confirming that the main line flow and the service flow are switched, and finishing the pre-filming service operation.
3. The corrosion inhibitor prefilming thickness test method according to claim 1, characterized in that: the processing operation flow of the film thickness detection sheet is as follows:
q1, processing a special hanging piece, wherein the hanging piece is made of L360QS and is arc-shaped, and the radian of the hanging piece is consistent with that of the pipeline hole;
q2, polishing the film thickness detection sheet (19) to 1000# step by using sand paper until the surface is uniform and smooth;
q3, putting into acetone solution to remove oil;
q4, putting into absolute ethyl alcohol for degreasing;
q5, placing the film thickness detection piece (19) into deionized water for washing, and drying;
q6, reserving a surface which is in direct contact with the pipe cleaner as a test surface, and sealing the rest surfaces with epoxy resin;
q7, numbering the cleaned film thickness test pieces (19), then weighing to the nearest 0.1mg, measuring, calculating the coupon size, calculating its surface area and recording data.
4. A corrosion inhibitor pre-film thickness testing device which is tested by the testing method of any one of claims 1 to 3 and is characterized in that: the device comprises a fuel gas pipeline (1), an acid gas pipeline (2), a reflux valve (3), a gas-water separator (4), a corrosion inhibitor filling system (5), a sewage treatment system (6), a venting safety valve (7), a venting pipeline (8), a ball collecting system (9), a ball serving system (10), a first elbow testing system (11), a temperature and pressure regulating system (12), a horizontal pipe section testing system (13), a second elbow testing system (14), a pressure sensor (15), a temperature sensor (16), a fluctuating pipe section testing system (17), a fifth testing point (18), a film thickness detecting sheet (19) and a third elbow testing system (20);
the temperature and pressure regulating system (12) is connected with the fuel gas pipeline (1), the acid gas pipeline (2) and the ball serving system (10), the horizontal pipe section testing system (13), the second elbow testing system (14), the fluctuating pipe section testing system (17), the first elbow testing system (11), the third elbow testing system (20) and the ball collecting system (9) are sequentially connected, the first test point (191), the second test point (192), the third test point (193), the fourth test point (194), the fifth test point (18), the pressure sensor (15) and the temperature sensor (16) are distributed on the test loop, the ball collecting system (9) is connected with the emptying pipeline (8), the gas-water separator (4) and the sewage treatment system (6), the gas-water separator (4) is connected with the acid gas pipeline (2), and the corrosion inhibitor filling system (5) is connected with the ball serving system (10).
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| CN112620016A (en) * | 2019-09-24 | 2021-04-09 | 中国石油化工股份有限公司 | Film coating device and method for sour gas pipeline of sulfur-containing gas field |
| CN111076775B (en) * | 2019-12-31 | 2024-06-04 | 陕西神渭煤炭管道运输有限责任公司 | Industrial test device and method for large-pipe-diameter coal conveying variable-diameter pipeline pigging through ball |
| CN112051207B (en) * | 2020-09-13 | 2022-03-29 | 西南石油大学 | Online evaluation device and evaluation method for corrosion inhibitor coating effect of gas gathering pipeline in mountainous area |
| CN113006743B (en) * | 2021-03-23 | 2022-07-19 | 西南石油大学 | Automatic coating process for gas recovery well corrosion inhibition liquid |
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| CN102305761B (en) * | 2011-08-01 | 2013-08-07 | 西南石油大学 | Acid medium transmission pipeline welded joint and parent metal corrosion simulation testing device and method |
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