CN111504846A - Indoor rapid evaluation method for corrosion inhibitor of crude oil production and transportation pipe - Google Patents
Indoor rapid evaluation method for corrosion inhibitor of crude oil production and transportation pipe Download PDFInfo
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Abstract
The invention discloses an indoor rapid evaluation method for a corrosion inhibitor of a crude oil production and transportation pipe, and relates to the field of corrosion and protection of crude oil pipelines. Aiming at the problem of low evaluation speed of the corrosion inhibitor of the crude oil production and transportation pipe at present, the invention provides an indoor quick evaluation method of the corrosion inhibitor of the crude oil production and transportation pipe, which simultaneously carries out a static hanging piece test, a dynamic hanging piece test and an electrochemical experiment indoors, designs a loop experiment device adopted by the dynamic hanging piece experiment, combines three experiment results, determines different corrosion inhibitor action mechanisms, carries out comprehensive evaluation on the corrosion inhibitor effect and can quickly screen out the corrosion inhibitor suitable for the crude oil production and transportation pipe.
Description
Technical Field
The invention relates to the technical field of material corrosion and protection, in particular to an indoor rapid evaluation method of a corrosion inhibitor of a crude oil production and transportation pipe, which is mainly used for screening and evaluating the corrosion inhibitor for the corrosion prevention of the crude oil production and transportation pipe.
Background
Crude oil pipeline transportation plays an extremely important role in economic development in China and the world, so that maintenance of safe and healthy operation of crude oil pipelines is an important and difficult long-term task for pipeline workers. The crude oil pipeline is mostly in a complex soil environment, and the transported medium is also corrosive, so that the inner wall and the outer wall of the pipeline can be corroded. Once the pipeline is corroded and perforated, the loss of oil and gas not only interrupts the transportation, but also pollutes the environment and even can cause fire hazard, and the production and transportation pipe in the crude oil pipeline is a pipeline which has the most complex transportation medium, the most impurities, the worst transportation environment and the most easy corrosion.
In recent years, the produced liquid of some old oil wells has higher water content, produced water mineralization degree and chloride ion content, and CO2The phenomenon of serious corrosion of some production and transportation pipes begins to emerge when corrosive gases appear, and the corrosion inhibitor serving as a high-efficiency and low-cost chemical preservative is gradually becoming a mainstream corrosion prevention measure of an oil and gas field, but the corrosion inhibitor has various types, and different production and transportation pipes need different corrosion inhibitors, so that the screening process of the corrosion inhibitor is extremely complicated and consumes much time. Therefore, the method for rapidly screening and evaluating the corrosion inhibitor of the crude oil production and transportation pipe has wide prospect and practical significance.
Disclosure of Invention
Aiming at the problem of low evaluation speed of the corrosion inhibitor of the crude oil production and transportation pipe in the prior art, the invention provides the method for evaluating the indoor effect of the corrosion inhibitor of the crude oil production and transportation pipe.
In order to achieve the purpose, the specific technical scheme of the method for evaluating the indoor effect of the corrosion inhibitor of the crude oil production and transportation pipe is as follows:
static hanging piece test scheme:
(1) strip treatment before testing
① degreasing and decontaminating, namely taking out the hanging piece, wiping off oil stain by coarse filter paper, removing dirt on the surface of the test piece by absorbent cotton, and continuously cleaning for 2-3 times;
② dehydrating, soaking the degreased test piece in absolute ethanol for further degreasing and dehydration;
③ drying, taking out the test piece, wiping with dry filter paper, and blowing with cold air;
④ weighing, the test piece which is wiped and dried is packaged by filter paper according to the test piece number, and the test piece is placed in a dryer for 4h and then weighed.
(2) Test procedure
① measuring the processed hanging piece size with vernier caliper, weighing simultaneously, and the hanging piece can not be touched directly with hand in the process;
② preparing a solution according to the concentration of the corrosion inhibitor required by the test;
③, hanging the sample in a rope, standing for 168h, taking out, processing and calculating the weight loss.
(3) Processing method for test hanging piece after being taken out
① preparing cleaning solution by dissolving hydrochloric acid in distilled water to obtain solution;
② degreasing and decontaminating, taking out the test piece, slightly wiping off oil stain with filter paper, washing oil with acetone, placing in a cleaning solution for 1-5 min (the cleaning solution can be lightly brushed with a brush), and neutralizing with sodium hydroxide solution after cleaning the test piece;
③ dehydrating, soaking in anhydrous ethanol for about 5min to further defat and dehydrate the test piece;
④, drying and weighing, wiping the surface of the test piece with filter paper, drying with cold air, storing in a drier for 4h, and weighing.
Dynamic hanging piece test scheme:
① polishing the metal hanging sheet with sand paper, washing with clear water, and soaking in anhydrous ethanol;
② taking out the hanging film, drying with cold air, taking picture, weighing, and recording data;
③ opening on the hose (1), hanging the hanging piece (3) in the hose by the thin nylon thread (2), making the hanging piece (3) lie on the bottom of the hose, adding corrosion inhibitors of different types and concentrations into the produced water, and making the produced water repeatedly wash the hanging piece at different flow rates by the miniature DC brushless water pump (4) for about 168 h;
④ preparing acid cleaning solution by using hydrochloric acid (100m L) and hexamethylenetetramine (5 g);
⑤ soaking the hanging sheet in the above solution after one cycle, washing with clear water, drying with cold air, weighing, and recording data;
⑥ the flow rate was varied by a tee to repeat the test, its test procedure and test material.
The corrosion rate was calculated as follows:
in the formula Vcorr-average corrosion rate, mm/a; m is0-mass of test piece before test, g; m is1-mass of test piece after test, g; s-total area of test piece, cm2(ii) a Rho-specimen density, g/cm3(ii) a t-test time, h.
In the formula RL-local corrosion rate, mm/a; h-pitting depth, mum; t-etching time, d.
Electrochemical test protocol:
in the electrochemical reaction, a three-electrode system is adopted to measure a Tafel polarization curve, and an electrochemical electrode is firstly prepared, wherein a reference electrode is an Ag/AgCl electrode, a crude oil collecting and conveying pipe is processed into a working electrode, and an auxiliary electrode is a Pt wire. Cutting a PVC pipe into a plurality of sections with proper length, and polishing the front end and the rear end of the cut PVC pipe to be flat by using abrasive paper with different thicknesses; preparing a plurality of sections of copper wires with proper lengths and insulating sheaths, cutting off the insulating sheaths of the front section and the rear section of each section of metal wire, and polishing the exposed copper wires to be bright by using sand paper if the exposed copper wires are embroidered; the method comprises the steps of flatly placing a polished and cleaned steel sheet on a glass surface, dotting a molten tin wire on the surface of the steel sheet by using an electric soldering iron, quickly inserting one side of a metal wire into the molten tin wire on the surface of the steel sheet for 30 seconds for fixing, fixing the other side of the steel sheet on a double-sided adhesive, winding and sealing a PVC pipe by using a prepared curing agent, standing for seven days, putting the prepared working electrode, a saturated, sweet and sour electrode and a uranium electrode into an electrolytic cell, and then connecting the electrolytic cell, an electrochemical workstation and a gas cylinder. When the applied polarization potential is larger, the logarithm of the current density and the overpotential are in a linear relation, the polarization curve is extrapolated to obtain the dynamic parameters such as Tafel slope, corrosion current density, corrosion potential and the like, a blank group and a corrosion inhibitor group are adopted to carry out a comparison experiment, and the action mechanism of the corrosion inhibitor is judged according to the moving direction of the electrochemical polarization curve.
Drawings
FIG. 1 is a step of evaluating the indoor effect of a corrosion inhibitor of a crude oil production and transportation pipe;
FIG. 2 is a schematic diagram of a dynamic hanging piece testing loop experimental device;
FIG. 3 is a plot of the X210-L SJW electrochemical test;
FIG. 4 is a plot of the X210-2-GTW-400 electrochemical test;
FIG. 5 is a graph of the electrochemical test X210-5-D L O-300.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without inventive effort based on the embodiments of the present invention, are within the scope of the present invention.
Table 1 shows the crude oil density of the crude oil samples tested:
TABLE 1 Density of oil samples at 20 ℃
| Number of well | X210 | X210-2 | X210-5 | X216-2 | X275 | X275-1 | H132 | H131-5 |
| Density/(g/cm)3) | 0.851 | 0.846 | 0.846 | 0.848 | 0.852 | 0.852 | 0.851 | 0.844 |
The method comprises the following steps: a static corrosion coupon test is carried out,
1) test protocol
In order to further verify the effect of the corrosion inhibitor filling on site, an indoor supplementary test of a site test is carried out. The testing steps comprise test piece treatment before testing, a testing operation process, a treatment method after taking out the test hanging piece and the like, and the specific operations are as follows:
(1) strip treatment before testing
① degreasing and decontaminating, namely taking out the hanging piece, wiping off oil stain by coarse filter paper, removing dirt on the surface of the test piece by absorbent cotton, and continuously cleaning for 2-3 times;
② dehydrating, soaking the degreased test piece in anhydrous alcohol for about 5min for further degreasing and dehydrating;
③ drying, taking out the test piece, wiping with dry filter paper, and blowing with cold air;
④, packaging the wiped and dried test piece with filter paper according to the test piece number, placing the test piece in a dryer for 4 hours, and weighing to 0.l mg for later use.
(2) Test procedure
① measuring the processed hanging piece size with vernier caliper, weighing simultaneously, and the hanging piece can not be touched directly with hand in the process;
② preparing a solution according to the concentration of the corrosion inhibitor required by the test (1000 mg/L);
③, hanging the sample in a rope, standing for 168h, taking out, processing and calculating the weight loss.
(3) Processing method for test hanging piece after being taken out
① preparing cleaning solution, weighing hydrochloric acid 50m L, adding distilled water to dissolve, and preparing solution 500m L;
② degreasing and decontaminating, taking out the test piece, slightly wiping off oil stain with filter paper, washing oil with acetone, placing in a cleaning solution for 1-5 min (the cleaning solution can be lightly brushed with a brush), and neutralizing with sodium hydroxide solution after cleaning the test piece;
③ dehydrating, soaking in anhydrous ethanol for about 5min to further defat and dehydrate the test piece;
④, drying and weighing, wiping the surface of the test piece with filter paper, drying with cold air, storing in a drier for 4h, and weighing to 0.1 mg.
(4) The corrosion rate was calculated by the formula (1-1).
2) Corrosion inhibition effect of different corrosion inhibitors under same concentration
The corrosion inhibition effect of five corrosion inhibitors on the N80 steel hanging piece under the concentration of 1000 mg/L is shown in Table 2, so that under the same concentration (1000 mg/L), the corrosion inhibitors GTW-400 have good corrosion inhibition effects in H131-5, X210-5 and X210, the lowest corrosion inhibition rate reaches 58.24%, the corrosion inhibitors D L O-300 have good corrosion inhibition effects in H131-5 and X210, the lowest corrosion inhibition rate exceeds 51%, the corrosion inhibitors D L W-300 have a corrosion inhibition rate in X210-5 and X210-2 of more than 79%, the corrosion inhibitors GTO-180 have a corrosion inhibition rate of 84.62% in X210, the corrosion inhibition rates of other sample types are lower than 30%, and the L SJW-500 has a poor corrosion inhibition effect in four samples, and the highest corrosion inhibition rate is lower than 40%.
TABLE 2 Corrosion inhibiting effect of five corrosion inhibitors on N80 steel
When the corrosion inhibitor is added, the corrosion inhibition effect is good, the corresponding hanger plate rust spot is naturally less, and when the corrosion inhibition effect is poor, the corresponding hanger plate is seriously corroded, and the rust spot is increased.
TABLE 3 immersion solutions for the coupons
3) Influence of different inhibitor concentrations
Two corrosion inhibitors D L W-300 and GTW-400 with best corrosion inhibition effect in the previous test are selected, N80 steel is used for making a coupon, the two concentrations of 500 mg/L and 1500 mg/L are respectively added into an H131-5 sample, a static coupon weight loss method is adopted, the coupon corrosion condition is observed after a period of time (one week) and the corrosion rate is calculated.
The corrosion inhibition effect of the corrosion inhibitor D L W-300 is obviously better than that of GTW-400, the increase of the corrosion inhibition effect is not obvious along with the increase of the concentration of the two corrosion inhibitors, and the corrosion inhibition effect of the two corrosion inhibitors is better than that of 1500 mg/L instead when the corrosion inhibition effect of the two corrosion inhibitors is 500 mg/L.
Step two: dynamic corrosion coupon testing
1) Test protocol
① polishing the metal hanging sheet with sand paper, washing with clear water, and soaking in anhydrous ethanol;
② taking out the hanging film, drying with cold air, taking picture, weighing, and recording data;
③ opening on the hose, suspending the hanging sheet in the hose with a thin nylon wire, making the hanging sheet lie at the bottom of the hose, adding corrosion inhibitors of different types and concentrations into the produced water, and repeatedly flushing the hanging sheet with the produced water at different flow rates by using a submersible pump for about 168 h;
④ preparing acid cleaning solution by using hydrochloric acid (100m L) and hexamethylenetetramine (5 g);
⑤ soaking the hanging sheet in the above solution after one cycle, washing with clear water, drying with cold air, weighing, and recording data;
⑥ the flow rate is changed by using a tee joint, and the test is repeated, wherein the test flow and the test material are respectively.
2) Dynamic corrosion inhibition effect of corrosion inhibitor L SJW-500
The coupon for dynamic corrosion of X210 produced water is more severe than the coupon for static corrosion, again probably due to erosion corrosion.
As can be seen from Table 4, the corrosion rate tends to decrease and then increase with the increase of the concentration of the corrosion inhibitor L SJW-500, and when the dosage of the corrosion inhibitor L SJW-500 reaches 112.2 mg/L, the loss of the quality of the hanging tablet is the lowest, and the slow release effect is the best.
TABLE 4 Corrosion inhibition Effect of the corrosion inhibitor L SJW-500
3) Evaluation of corrosion inhibition effect of corrosion inhibitor D L W-300
As shown in Table 5, the corrosion inhibition rate of the corrosion inhibitor D L W-300 in the second period is obviously reduced compared with the corrosion inhibition rate in the first period, the corrosion inhibition rate is increased to the state in the first period along with further increase of the concentration, and when the addition of D L W-300 is 148.2 mg/L, the corrosion inhibition effect is optimal.
TABLE 5 Corrosion inhibition Effect of the corrosion inhibitor D L W-300
Thirdly, electrochemical evaluation, namely adding L SJW-500 into an X210 sample to prepare a solution with the concentration of the corrosion inhibitor of 1000 mg/L, adding GTW-400 into an X210-2 sample to prepare a solution with the concentration of the corrosion inhibitor of 1000 mg/L, adding D L O-300 into an X210-5 sample to prepare a solution with the concentration of the corrosion inhibitor of 1000 mg/L, and respectively adding D L O-300, GTO-180 and L SJW-500 into an H131-5 sample to prepare a solution with the concentration of 1000 mg/L.
In addition, according to the principle of an anodic desorption process of the corrosion inhibitor, the adsorption coverage rate is reduced and the anodic polarization is increased according to the principle that when the electric potential is increased, the anodic dissolution speed of the metal surface which is not covered by the corrosion inhibitor is increased, the stability of the metal surface which is covered by the corrosion inhibitor is weakened, the anodic desorption process finally occurs, the coverage rate is reduced continuously, and the coverage rate is reduced, so that the metal surface tends to be zero, and the metal surface tends to be similar to the metal surface which is not covered by the corrosion inhibitor, and the anode polarization curve which is similar to the anode polarization curve which is increased in the subsequent corrosion inhibition solution, and the metal surface which is not covered by the corrosion inhibitor is similar to the anode polarization curve which is increased in the subsequent corrosion inhibition solution.
The method is characterized in that three corrosion inhibitors D L O-300, GTO-180 and L SJW-500 are respectively added into the produced water H131-5 at a concentration of 1000 mg/L. after the three corrosion inhibitors are added, the corrosion potential is increased, and the corrosion is controlled, wherein a cathode polarization curve of L SJW-500 is superposed with a blank group, an anode desorption process is carried out, after the anode desorption process is finished, an anode polarization curve is completely superposed with an anode polarization curve in a blank solution, and after the three corrosion inhibitors are added, the corrosion potential of D L O-300 moves to the forward direction most, so that the corrosion inhibition effect is best.
Claims (5)
1. An indoor rapid evaluation method for a corrosion inhibitor of a crude oil production and transportation pipe is characterized by comprising the following steps:
the first step is as follows: taking liquid in a field crude oil production and transmission pipe to perform static coupon testing, and calculating an average corrosion rate and a local corrosion rate;
the second step is that: taking liquid in a field crude oil production and transmission pipe, carrying out dynamic coupon test by adopting a loop experiment device, and calculating an average corrosion rate and a local corrosion rate;
the third step: carrying out electrochemical experimental evaluation to judge the action mechanism of the corrosion inhibitor;
the fourth step: and comprehensively comparing the electrochemical experiment result with a static hanging sheet experiment and a dynamic hanging sheet experiment to finish the effect evaluation of the corrosion inhibitor.
2. The indoor rapid evaluation method of the corrosion inhibitor of the crude oil production and transportation pipe according to claim 1, characterized in that the static hanging experiment specifically operates as follows:
preparing an experimental solution according to the concentration of a required corrosion inhibitor, performing test pretreatment on a hanging piece, wherein the test pretreatment comprises ① degreasing decontamination, taking out the hanging piece, wiping off oil stain by coarse filter paper, removing dirt on the surface of the test piece by absorbent cotton, ② dehydration, soaking the degreased test piece in absolute ethyl alcohol, ③ drying, taking out the test piece, wiping the test piece by dry filter paper, drying the test piece by cold air, ④ weighing, weighing the test piece, wiping the test piece, drying the test piece, hanging the test piece in the solution by a rope, standing the test piece for a period of time, taking out the test piece, performing test post-treatment on the test piece, wherein the test piece comprises ① preparing a hydrochloric acid solution, ② degreasing decontamination, taking out the test piece, slightly wiping off oil stain by the filter paper, washing oil by acetone, cleaning the test piece, neutralizing the test piece by sodium hydroxide solution, ③ dehydration, soaking the test piece in absolute ethyl alcohol, ④ drying and weighing, wiping off the surface of the test piece by cold air, and drying the test piece, and weighing.
3. The indoor rapid evaluation method of the corrosion inhibitor of the crude oil production and transportation pipe according to claim 1, characterized in that the loop experiment device adopted by the dynamic hanging piece experiment is as follows:
the method comprises the steps of opening an upper opening of a hose (1), hanging a hanging piece (3) in the hose (1) through a thin nylon wire (2), enabling the hanging piece (3) to lie at the bottom of the hose (1), adding a corrosion inhibitor solution into a storage tank (6), circularly producing water through a miniature direct-current brushless water pump (4), changing the flow rate through a flow rate adjusting valve (5), and enabling the produced water to repeatedly wash the hanging piece at different flow rates.
4. The indoor rapid evaluation method of the corrosion inhibitor of the crude oil production and transportation pipe according to claim 1, characterized in that the dynamic hanging experiment comprises the following steps:
① polishing the metal hanging sheet with sand paper, washing with clear water, and soaking in anhydrous ethanol;
② taking out the hanging film, drying with cold air, taking picture, weighing, and recording data;
③ opening on the hose (1), hanging the hanging piece (3) in the hose by the thin nylon thread (2), making the hanging piece (3) lie at the bottom of the hose, adding corrosion inhibitors of different types and concentrations into the produced water, and making the produced water repeatedly wash the hanging piece at different flow rates by the miniature DC brushless water pump (4);
④ preparing acid cleaning solution with hydrochloric acid and hexamethylenetetramine;
⑤ soaking the hanging sheet in the above solution after one cycle, washing with clear water, drying with cold air, weighing, and recording data;
⑥ the flow rate was varied by means of the flow rate regulating valve (5) and the test was repeated.
5. The indoor rapid evaluation method of the corrosion inhibitor of the crude oil production and transportation pipe according to claim 1, characterized in that in the electrochemical reaction, a three-electrode system is adopted to measure a Tafel polarization curve, wherein a reference electrode is an Ag/AgCl electrode, the crude oil production and transportation pipe is processed into a working electrode, an auxiliary electrode is a Pt wire, when an external polarization potential is large, the logarithm of current density and an overpotential are in a linear relationship, the polarization curve is extrapolated to obtain dynamic parameters such as Tafel slope, corrosion current density, corrosion potential and the like, a blank group and a corrosion inhibitor group are adopted to carry out a comparison experiment, and the action mechanism of the corrosion inhibitor is judged according to the moving direction of the electrochemical polarization curve.
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