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Detection method for concentration of demulsifying agent in crude oil

A detection method and demulsifier technology, which are applied in the direction of material analysis, measurement device, and test sample preparation through observation of the influence of chemical indicators, and can solve the problems of unstable measurement methods, difficult spectral analysis, and interference with quantitative analysis. issues such as low standard deviation, wide coverage and good repeatability

Active Publication Date: 2019-03-19
中国石油工程建设有限责任公司华北分公司
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  • Description
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Problems solved by technology

[0009] In 2013, Zhang et al. established a fast high-performance liquid chromatography method for the determination of Tween 80 and its decomposition products. The average recovery rate of 9 determinations was 95.12%, indicating that the method has high accuracy, but the RI needs to be eluted, which weakens the Separation ability
[0035] Electrochemical method: This method has high accuracy, but its detection range is narrow, the mass concentration is between 0.05 and 20mg / L, and the potential value will drift, so the determination method is unstable and has poor repeatability
[0036] Spectrometry: Spectrometry has high sensitivity, but for mixtures with similar multi-component chemical properties, because their spectral peaks overlap and seriously interfere with quantitative analysis, it is difficult to use spectral analysis

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  • Detection method for concentration of demulsifying agent in crude oil
  • Detection method for concentration of demulsifying agent in crude oil
  • Detection method for concentration of demulsifying agent in crude oil

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Embodiment 1

[0088] In this embodiment, the Yanyi Joint Station is selected as the test target, in order to provide a detection method for the concentration of polyoxyethylene in crude oil, and the detection method includes the following steps:

[0089] (1) Take by weighing 3g cobalt nitrate, 20g ammonium thiocyanate and 20g potassium chloride and dissolve in distilled water, stir evenly, transfer to 100mL volumetric flask, constant volume with distilled water, shake up, obtain cobalt thiocyanate salt solution; Use demulsifier to prepare standard solutions with concentration gradients of 0 mg / L, 5 mg / L, 10 mg / L, 15 mg / L, and 20 mg / L, and add 10 mL of dichloromethane or trichloromethane with a concentration of 99.5% to extract for 10 min. Then add the cobalt thiocyanate solution that the step (1) of 5mL obtains and develop color 10min at 25 DEG C, benefit ultraviolet spectrophotometer to measure standard solution organic layer by ultraviolet spectrophotometry when test temperature is 25 DEG ...

Embodiment 2

[0101] This embodiment selects any combination station as the test target, and is to provide a detection method for polyoxyethylene group concentration in crude oil, and the detection method includes the following steps:

[0102] (1) Take by weighing 3g cobalt nitrate, 20g ammonium thiocyanate and 20g potassium chloride and dissolve in distilled water, stir evenly, transfer to 100mL volumetric flask, constant volume with distilled water, shake up, obtain cobalt thiocyanate salt solution; Use a demulsifier to prepare standard solutions with concentration gradients of 2mg / L, 4mg / L, 9mg / L, 13mg / L, and 18mg / L, and add a volume of 10mL of dichloromethane or trichloromethane with a concentration of 99.5% for 10min. Then add the cobalt thiocyanate solution that the step (1) of 5mL obtains and develop color 10min at 25 DEG C, benefit ultraviolet spectrophotometer to measure standard solution organic layer by ultraviolet spectrophotometry when test temperature is 25 DEG C at a wavelengt...

Embodiment 3

[0110] The present embodiment chooses the Ma-Yi joint station as the test target, is to provide a kind of detection method of polyoxyethylene group concentration in crude oil, and described detection method comprises the following steps:

[0111] (1) Take by weighing 3g cobalt nitrate, 20g ammonium thiocyanate and 20g potassium chloride and dissolve in distilled water, stir evenly, transfer to 100mL volumetric flask, constant volume with distilled water, shake up, obtain cobalt thiocyanate salt solution; Use demulsifier to prepare standard solutions with concentration gradients of 12mg / L, 25mg / L, 35mg / L, 50mg / L, 100mg / L, 170mg / L, and 220mg / L, and add a volume of 10mL of 99.5% dichloro Extract with methane or chloroform for 10min, then add the cobalt thiocyanate salt solution obtained in step (1) with a volume of 5mL and develop color for 10min at 25°C, which is beneficial for the ultraviolet spectrophotometer to pass the ultraviolet spectrophotometric method when the test tempe...

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Abstract

The invention provides a detection method for the concentration of a demulsifying agent in crude oil. The detection method comprises the following steps: (1) preparing a standard solution with a gradient concentration by utilizing the demulsifying agent; adding an extracting agent and extracting; developing through a color developing agent; determining the absorbance of an organic layer of the standard solution through ultraviolet spectrophotometry; drawing a standard curve according to the absorbance and the concentration; (2) adding the demulsifying agent with the known content into a sampleto be detected; separating an oil phase and a water phase in the sample to be detected, so as to obtain a water phase layer and a crude oil layer; (3) adding the extracting agent into the water phaselayer to extract and adding the color developing agent to carry out color development; determining the absorbance of the organic layer of the sample to be detected through the ultraviolet spectrophotometry; quantifying the concentration of the demulsifying agent in the water phase layer in step (2) according to the standard curve drawn in step (1); and (4) obtaining the concentration of the demulsifying agent in the crude oil according to the concentration of the demulsifying agent in the water phase layer in step (3) and the demulsifying agent with the known content in step (2).

Description

technical field [0001] The invention belongs to the field of crude oil and relates to a method for detecting the concentration of a demulsifier in crude oil. Background technique [0002] At present, oilfield sites urgently need to measure the concentration of demulsifier in crude oil, so as to guide the actual dosing amount on site and control costs at the same time. But so far, there is no fast and economical method for determining the content of demulsifier in crude oil. Since the demulsifiers used in oil fields are mainly polyoxyethylene-based nonionic surfactants, this patent only provides a quick and economical method for indirectly detecting the content of demulsifiers in crude oil. [0003] The principle of this patented method is to use the color change produced by the coordination reaction, use a spectrophotometer to measure and measure the ligand content, and then measure the concentration of the demulsifier in the oilfield sewage according to this reaction, and ...

Claims

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Application Information

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IPC IPC(8): G01N21/78G01N21/33G01N1/34G01N1/40
CPCG01N1/34G01N1/4055G01N21/33G01N21/78G01N2001/4061
Inventor 郭慧军张朝阳底国彬林俊岭邢晓东王培培朱倩许传欣向多华鞠士义王晓勇李少平于敏马庆龙邱琪欧阳东旭冯永年王洋
Owner 中国石油工程建设有限责任公司华北分公司
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