Corrosion inhibitor concentration detection method
A detection method and corrosion inhibitor technology, which is applied in the field of chemical analysis and detection, can solve the problems of inability to accurately measure the actual concentration of low-content corrosion inhibitors, poor ultraviolet absorption of corrosion inhibitors, and low effective concentration of corrosion inhibitors, so as to save manpower The effect of material resources, short time and simple operation
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Embodiment 1
[0033] Taking the concentration detection of imidazoline corrosion inhibitor RX-210 in high water injection wells as an example
[0034] Taking the imidazoline corrosion inhibitor RX-210 (molecular weight 584) being used in Changqing Oilfield as an example, the concentration of the corrosion inhibitor is detected by the monitoring method provided by the present invention. The specific steps include: 1) sample preparation; 2) determining chromatographic separation conditions; 3) determining mass spectrometry conditions; 4) measuring the content of optical isomers.
[0035] 1. Sample preparation
[0036] RX-210 uses an automatic downhole dosing device to add medicine. The dosing valve is opened for 3 minutes every 4 hours, and the sample to be tested is taken out from the oil well outlet. The sample to be tested is crude oil with high water content. After standing for 10 minutes, take 100uL of the sample to be tested and add 900μL of methanol , acetonitrile and water in the mix...
Embodiment 2
[0059] Taking concentration detection of corrosion inhibitor RX-210 in produced water as an example
[0060] The crude oil flows into the gathering station through the pipeline, and the crude oil is separated through the three-phase separator. Therefore, the content of corrosion inhibitor in the produced water can guide the dosing frequency of the automatic dosing device.
[0061] Except following conditions, other conditions are identical with embodiment 1:
[0062] ①Take 100 μL of produced water from the three-phase separator and add 1900 μL of methanol, acetonitrile and water into the mixed solution. The volume ratio of methanol, acetonitrile and water in the mixed solution is 1:1:1;
[0063] ② Chromatographic column: ZORBAX RRHD column (50mm*2.1mm*1.8μm);
[0064] ③Mobile phase A (water+0.1% formic acid), B (acetonitrile+0.1% formic acid), 0min 100%A+0%B, 0.5min100%A+0%B; 3min 1%A+99%B, 5min 1 %A+99%B, 5.5min 100%A+0%B, 6min 100%A+0%B); the flow rate is 0.15mL / min;
[...
Embodiment 3
[0071] Taking the concentration detection of corrosion inhibitor PS-10 in reinjection water as an example
[0072] PS-10 is a benzothiazole scale and corrosion inhibitor, the formula is confidential, and the molecular weight of its active ingredient is 167.2. On-site addition is through the dosing pump of the gathering station, and the concentration required by the process is 25-30ppm.
[0073] Except following conditions, other conditions are identical with embodiment 1:
[0074] ①Retrieve 100 μL of water injection, add 1400 μL of methanol, acetonitrile and water mixed solution, the volume ratio of methanol, acetonitrile and water in the mixed solution is 3:2:1;
[0075] ② Chromatographic column: Poroshell120SB-C18 chromatographic column (75mm*4.6mm*2.7μm);
[0076] ③Mobile phase A (water+0.1% formic acid+5mM ammonium acetate), B (acetonitrile+0.1% formic acid), 0min 100%A+0%B, 0.5min 100%A+0%B; 8min 1%A+99 %B, 9min 1%A+99%B, 9.5min 100%A+0%B, 10min100%A+0%B); the flow rat...
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