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Method for measuring content of polymer in water produced in oil field

A technology for polymers and produced water, which is applied in the measurement of color/spectral properties, material analysis by observing the effect on chemical indicators, and analysis by chemical reaction of materials. and other problems to achieve the effect of simplifying the determination method

Pending Publication Date: 2022-06-07
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, gel chromatography and chemiluminescence nitrogen determination are often difficult to popularize because of the expensive testing equipment.

Method used

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  • Method for measuring content of polymer in water produced in oil field

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0088] Example 1: Detecting the concentration of polyacrylamide and its derivatives in oil field produced water in oil displacement profile control process

[0089] Experimental drugs: zirconium oxychloride octahydrate, analytically pure; cetyltrimethylammonium bromide, analytically pure; methylthymol blue, indicator; polyacrylamide, analytically pure.

[0090] The operation steps of the detection method for the concentration of polyacrylamide and its derivatives in oil field produced water are:

[0091] (1), use distilled water and zirconium oxychloride octahydrate to prepare a zirconium ion reagent solution with a converted zirconium ion concentration of 100 mg / L, and adjust the pH of the zirconium ion reagent solution with a concentration of 10% hydrochloric acid to be 4 to obtain Zirconium ion solution.

[0092] (2), prepare the developer solution containing cetyl trimethyl ammonium bromide and methyl thymol blue with distilled water, and the concentration of methyl thymo...

Embodiment 2

[0106] Embodiment 2: detect the concentration of hydroxypropyl guar gum in oil field produced water in fracturing process

[0107] Experimental drugs: zirconium hydroxide, analytically pure; cetyltrimethylammonium bromide, analytically pure; methyl thymol blue (MTB), indicator; hydroxypropyl guar gum, analytically pure.

[0108] The operation steps of the detection method for the concentration of hydroxypropyl guar gum in oil field output water are:

[0109] (1), use distilled water and zirconium hydroxide to prepare a zirconium ion reagent solution with a converted zirconium ion concentration of 100 mg / L, and adjust the pH of the zirconium ion reagent solution to 4 through hydrochloric acid with a concentration of 10% to obtain a zirconium ion solution .

[0110] (2), prepare the developer solution containing cetyl trimethyl ammonium bromide and methyl thymol blue with distilled water, and the concentration of methyl thymol blue is 400 mg / L, cetyl bromide The mass ratio of ...

Embodiment 3

[0124] Example 3: Detecting the concentration of hydroxymethyl cellulose in oil field produced water in the well cleaning process

[0125] Experimental drugs: zirconium oxychloride octahydrate, analytically pure; cetyltrimethylammonium bromide, analytically pure; methylthymol blue, indicator; hydroxymethyl cellulose, analytically pure.

[0126] The operation steps of the detection method for the concentration of hydroxymethyl cellulose in oil field produced water are:

[0127] (1), use distilled water and zirconium oxychloride octahydrate to prepare a zirconium ion reagent solution with a converted zirconium ion concentration of 100 mg / L, and adjust the pH of the zirconium ion reagent solution with a concentration of 10% hydrochloric acid to be 4 to obtain Zirconium ion solution.

[0128] (2), using distilled water to prepare a developer solution containing cetyltrimethylammonium bromide and methylthymol blue, and the concentration of methylthymol blue is 400 mg / L.

[0129] ...

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Abstract

The embodiment of the invention discloses a method for measuring the concentration of a polymer in water produced by an oil field, and belongs to the technical field of oil and gas exploitation. The method comprises the following steps: adding a zirconium ion compound and an acidic compound into a standard solution to prepare a zirconium ion solution; adding methyl thymol blue into the standard solution to prepare a color developing agent solution; mixing and reacting the zirconium ion solution and the oilfield produced water to obtain a first reaction solution; mixing and reacting the first reaction solution and a color developing agent solution to obtain a second reaction solution; reading an absorbance value of the second reaction solution under visible light; and determining the concentration of the polymer in the oilfield produced water based on the absorbance value. In the embodiment of the invention, after the absorbance value corresponding to the oilfield produced water is determined through the oilfield produced water, the zirconium ion solution and the color developing agent solution, the absorbance value can be substituted into the calculation model of the polymer to determine the concentration of the polymer in the oilfield produced water, so that the method for determining the concentration of the polymer in the oilfield produced water is simplified.

Description

technical field [0001] The embodiments of the present application relate to the technical field of oil and gas exploitation, and in particular, to a method for measuring the content of polymers in oil field produced water. Background technique [0002] Polyacrylamide and its derivatives, cellulose and its derivatives, guar gum and its derivatives and other polymers have the advantages of increased viscosity and good suspension, and are widely used in various processes in the process of oilfield exploitation. For example, polyacrylamide and its derivatives are usually used in oil displacement and profile control processes in oil fields; cellulose and its derivatives are usually used in oil field fracturing processes; guar gum and its derivatives are usually used in in the workover process of the oil field. In order to achieve effective tracking of each process, the polymer content in the output water of each process is usually measured to determine the effectiveness of each ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/78G01N21/31
CPCG01N21/78G01N21/31
Inventor 程静葛红江张杰杨卫华郭志强袁肖肖雷齐玲
Owner PETROCHINA CO LTD