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Method of determining polyether polyol content in drilling fluid in field

A polyether polyol and drilling fluid technology, which is applied in the measurement of color/spectral characteristics, etc., can solve the problems of small detection range, cumbersome steps, complicated operation, etc., and achieves low cost, simple and fast analysis process, and good reproducibility. Effect

Active Publication Date: 2014-11-19
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

Although these methods have high accuracy, the detection range is small, the operation is complicated and there are many interference factors.
The picrate method and cobalt thiocyanate color method take a long time, the steps are cumbersome, and the use of toxic reagents causes great environmental pollution
Cadmium thiocyanide complex extraction atomic absorption method and anodic stripping voltammetry are not easy to make small instruments and cannot be used for on-site determination

Method used

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  • Method of determining polyether polyol content in drilling fluid in field
  • Method of determining polyether polyol content in drilling fluid in field

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Embodiment Construction

[0022] 1. Drawing of linear relationship standard curve:

[0023] 1. Accurately weigh 7 parts of 15g drilling fluid in a 250mL volumetric flask, add different quality polyether polyol standard samples, so that the polyether polyol mass fractions are 0, 0.3495%, 0.7006%, 1.025%, 1.431% , 1.873%, 2.294%, dilute to 250mL with deionized water. Dilute 5 times with deionized water for later use.

[0024] 2. Take seven 5mL centrifuge tubes, add 3.5mL of the above-mentioned 7 parts of standard polyether polyol drilling fluid, and then add a drop of hydrochloric acid aqueous solution (V HCl :V H2O =1:4), so that the pH of the mixed system in the 7 centrifuge tubes was 2. Add 1 mL of barium chloride with a mass percentage of 30% to each of the seven centrifuge tubes for reaction, and then add 100.00 μl of a 5% mass percentage of silicomomolybdic acid aqueous solution to the seven centrifuge tubes after the reaction The reaction was carried out, and after the reaction was completed, ...

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Abstract

The invention provides a method of determining the polyether polyol content in a drilling fluid in field, belonging to the technical field of chemical analysis of the drilling fluids. The method comprises the following steps of: determining the absorbance of silicomolybdic acid in the drilling fluid in the field firstly, and correspondingly searching the polyether polyol content in the drilling fluid to be detected from a linear relation standard curve of the absorbance of the silicomolybdic acid in the drilling fluid and the polyether polyol content in the drilling fluid. The method has the characteristics of wide application range, high sensitivity and accuracy, good reproducibility and the like. According to the method provided by the invention, a peak value occurs at about 210nm; and the linear relation standard curve of the absorbance of the silicomolybdic acid in the drilling fluid and the polyether polyol content in the drilling fluid can be made in advance, the absorbance of the drilling fluid to be detected only needs to be tested in the field, and therefore, a portable small-sized spectrophotometer can be adopted, thus reaching the purposes of collecting and rapidly determining the polyether polyol content in the drilling fluid in the field.

Description

technical field [0001] The invention belongs to the technical field of chemical analysis of drilling fluid, in particular to a method for on-site quantitative analysis of polyether polyol content in drilling fluid. Background technique [0002] Quantitative analysis of polyether nonionic surfactants includes instrumental and chemical methods. Except for alkylphenol polyoxyethylene ether nonionic surfactants containing benzene ring structure, which can be directly determined by photometry, chemical methods are generally used for determination. The detection methods of polyether polyols include picrate method (0. 1 ~ 1mg / L), oscillographic polarography (0. 1 ~ 2. 6mg / L) and potassium tetraiodide cadmium association extraction atomic absorption method (0.07~3 mg / L), etc. Although these methods have high accuracy, the detection range is small, the operation is complicated and there are many interference factors. The picrate method and cobalt thiocyanate ammonium chromogenic m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/33
Inventor 宋碧涛陈雪艳谭敏刘子龙薛芸曾甘林
Owner CHINA PETROLEUM & CHEM CORP
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