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Method for detecting molecular weight of hydrolyzed polyacrylamide

A polyacrylamide and molecular weight technology, which is applied in measurement devices, analytical materials, flow characteristics, etc., can solve the problems of low work efficiency, cumbersome testing process, and difficulty in cleaning Ubbelohde viscometers, and achieve high work efficiency and easy cleaning. Effect

Inactive Publication Date: 2013-07-24
PETROCHINA CO LTD +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, the cleaning of the Ubbelohde viscometer is very difficult, it needs to be soaked in a toxic solution, and it needs to be dried in an oven after cleaning
In short, the testing process of this method is cumbersome and the work efficiency is very low

Method used

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  • Method for detecting molecular weight of hydrolyzed polyacrylamide
  • Method for detecting molecular weight of hydrolyzed polyacrylamide
  • Method for detecting molecular weight of hydrolyzed polyacrylamide

Examples

Experimental program
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Effect test

Embodiment 1

[0033] 1. Preparation of hydrolyzed polyacrylamide solutions with different molecular weights:

[0034] Raw materials: Five kinds of hydrolyzed polyacrylamides were selected, with molecular weights of 400, 800, 1566, 1907, and 32.68 million, respectively, from Daqing Refining and Chemical Company. These five kinds of hydrolyzed polyacrylamides were prepared into solutions. For the preparation method, see the sample solution in the determination method of the degree of hydrolysis of partially hydrolyzed polyacrylamide for oil flooding in the relevant standards of China Petroleum and Natural Gas Corporation Standard Q / SY 119-2005. preparation.

[0035] 2. Measure the rheological curves of different molecular weight hydrolyzed polyacrylamide solutions in step 1:

[0036] 1) Start the ARES-LS1 rotational rheometer produced by TA Company in the United States according to the correct start-up procedure;

[0037] 2) Turn on the computer, double-click the TA Orchestrator icon on the...

Embodiment 2

[0070] Embodiment 2: repeatability experiment

[0071] A hydrolyzed polyacrylamide sample with a molecular weight of 31.53 million was selected and measured three times using the method of the present invention to obtain three rheological curves. See the attached Figure 8 , It can be seen from the three rheological curves that the repeatability is good, and the fitted zero-shear viscosity is 17.4155Pa.s, 17.2.19Pa.s, and 16.7211Pa.s respectively. The calculated molecular weights were 30.89 million, 30.62 million, and 30.02 million, respectively. The relative deviation is 0.43%, indicating that the repeatability of the experiment is very good.

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Abstract

The invention discloses a method for detecting the molecular weight of hydrolyzed polyacrylamide, which solves the problem that the operation is complicated in an existing detection method. According to the method, a rotational rheometer is adopted to measure a rheological curve of hydrolyzed polyacrylamide solutions with the different molecular weights; a Carreu model is used for calculating the zero shear viscosity of the hydrolyzed polyacrylamide solutions with the different molecular weights; the zero shear viscosity is used as a horizontal coordinate to draw a picture of the molecular weights to obtain a relation between the zero shear viscosity and the molecular weights; then the zero shear viscosity of the hydrolyzed polyacrylamide to be detected is measured; and the molecular weight of the hydrolyzed polyacrylamide to be detected is obtained by utilizing the relation. According to the method disclosed by the invention, an operation process is simplified, the working time is shortened and the working efficiency is improved under the precondition of ensuring the measurement accuracy.

Description

technical field [0001] The invention relates to a method for detecting the molecular weight of hydrolyzed polyacrylamide for oilfield polymer flooding. Background technique [0002] Polymer flooding increases oil recovery mainly by increasing the viscosity of injected water and reducing water phase permeability. The molecular weight of the polymer is one of the main parameters affecting the above mechanism. The higher the molecular weight of the polymer, the better the viscosity-increasing property and the stronger the ability to reduce the water phase permeability. However, if the molecular weight is too high, it will block the oil layer and cause damage to the oil layer. If the molecular weight is too low, due to the poor viscosification, it is necessary to increase the amount of polymer used, which will affect the technical and economic effect of polymer flooding. Therefore, how to choose the molecular weight is a very critical issue. The polymer used in polymer floodin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N11/00
Inventor 吴淑云
Owner PETROCHINA CO LTD
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