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Method for detecting content of sulphobetaine surfactant in oil well injection-production fluid through high performance liquid chromatography

A high-performance liquid chromatography and sulfobetaine technology, which is applied in the field of oilfield chemical analysis, can solve the problems of unsatisfactory determination of sulfobetaine surfactant content, cumbersome operation steps, and low sensitivity, and achieve an excellent detection method , good repeatability and high sensitivity

Inactive Publication Date: 2018-09-28
LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the detection methods of sulfobetaine in oil well injection production fluid include acid-base titration, colorimetry, gravimetric method, thin-layer scanning quantitative method, Kjeldahl method, perchloric acid non-aqueous titration method, spectrophotometric method, etc. These methods all have problems such as cumbersome operation steps, many interference factors, low sensitivity and poor reproducibility.
It is not ideal for the determination of sulfobetaine surfactant content in complex oil well injection production fluid

Method used

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  • Method for detecting content of sulphobetaine surfactant in oil well injection-production fluid through high performance liquid chromatography
  • Method for detecting content of sulphobetaine surfactant in oil well injection-production fluid through high performance liquid chromatography
  • Method for detecting content of sulphobetaine surfactant in oil well injection-production fluid through high performance liquid chromatography

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Sample preparation for sultaine surfactant analysis:

[0020] Preparation of standard solution: Weigh 100 mg of sulfobetaine surfactant standard, weigh it accurately, put it in a 1000 ml volumetric flask, add blank oil well injection fluid and dilute to the mark, shake well to obtain a standard solution.

[0021] Preparation of the test solution: Measure 50 mL of the oil well injection fluid sample, measure it precisely, place it in a 1000 ml volumetric flask, add an appropriate amount of blank oil well injection fluid, dissolve it and set the volume to the mark, shake well to obtain the test solution .

[0022] Five copies of each of the standard solution and the test solution were prepared.

[0023] Chromatographic analysis conditions: Agilent 1100 high performance liquid chromatography, Waters C18 column (50 mm × 4.6mm I.D., 5 μm); mobile phase: methanol, water as mobile phase, gradient elution, 0~2 min 70% methanol , 100% methanol after 2.01 min; injection volume:...

Embodiment 2

[0046] The preparation of standard solution is the same as in Example 1.

[0047] Preparation of the test solution: take 5 mL of the oil well production fluid and shake well to obtain the test solution.

[0048] Five copies of each of the standard solution and the test solution were prepared.

[0049] Chromatographic analysis conditions: Agilent 1100 HPLC, Agilent C18 column (50 mm × 4.6 mm I.D., 5 μm); mobile phase: methanol, water as mobile phase, gradient elution, 0-2 min is 70% methanol , 100% methanol after 2.01 min; injection volume: 20 µL; detector: ELSD; gas flow rate: 2.4 mL / min; evaporation temperature: 118 °C; column temperature: 25 °C.

[0050] According to the above-mentioned chromatographic conditions, all standard products and need testing samples were sampled respectively, and the peak area obtained by sample injection of 5 samples of standard solution was 4429 respectively, and the RSD was 0.29%; the average value of the peak areas obtained by 5 samples of te...

Embodiment 3

[0054] The preparation of sample and standard solution is the same as in Example 1.

[0055] Chromatographic analysis conditions: Agilent 1100 high performance liquid chromatography, Agilent C18 column (50 mm × 4.6 mm I.D., 5 μm); mobile phase: methanol, water as mobile phase, gradient elution, 0-2 min is 70% methanol , 100% methanol after 2.01 min; injection volume: 20 µL; detector: ELSD; gas flow rate: 2.2 mL / min; evaporation temperature: 113 ℃; column temperature: 25 ℃.

[0056] According to the above-mentioned chromatographic conditions, all standard products and need testing samples were sampled respectively, and the peak area obtained by sample injection of 5 samples of standard solution was 4420 respectively, and the RSD was 0.25%; the average value of peak areas obtained by 5 samples of test solution was 4464 with an RSD of 0.29%.

[0057] The concentration of sulfobetaine in the test solution: logM 样 =logM 标 / logA 标 ×logA 样

[0058] Adopt the external standard m...

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Abstract

The invention relates to a method for detecting the content of a sulphobetaine surfactant in an oil well injection-production fluid through high performance liquid chromatography. The method comprisespreparing a standard substance solution and a sample solution from a blank oil well injection-production fluid, feeding 20 micro-liter of the sample, and calculating the content through an external standard method, wherein the high performance liquid chromatography conditions comprise a C18 chromatographic column as a chromatographic column, an evaporative light scattering detector as a detector,methanol and water as mobile phases, use of gradient elution with 70% methanol in 0-2min and 100% methanol after 2.01min, airflow velocity of 2-2.5L / min and an evaporating temperature of 110-120 DEGC. The method has the advantages of fast analysis speed, simple operation, safety, reliability, quantification of the content of a sulphobetaine surfactant based on an external standard method, few interference factors, high accuracy, good repeatability and high sensitivity.

Description

technical field [0001] The invention relates to a method for determining the content of sulfobetaine surfactant in oil well injection and production fluid, in particular to a method for determining the content of sulfobetaine surfactant in oil well injection and production fluid by using high performance liquid chromatography, belonging to Field of oilfield chemical analysis technology. Background technique [0002] Surfactant flooding plays an important role in tertiary oil recovery. The mechanism is that surfactants can effectively reduce the oil-water interfacial tension to ultra-low, thereby displacing residual oil from the reservoir. The sulfobetaine surfactant is an amphoteric surfactant composed of a quaternary ammonium salt type cationic part and a sulfonate type anion part. The special structure of the sulfobetaine surfactant determines its unique performance, such as high Excellent resistance to hard water, good interfacial activity in a wide pH range, etc. These ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N30/02G01N30/04
CPCG01N30/02G01N30/04G01N2030/047
Inventor 郭勇梁晓静王立成
Owner LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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