Method for determining hydrolysis degree of partially hydrolyzed polyacrylamide for oil displacement

A technology of polyacrylamide and degree of hydrolysis, applied in chemical method analysis, chemical analysis by titration method, measuring device, etc., can solve the problems of large subjective judgment error, difficult to identify the color of titration end point, etc., and achieve the elimination of human error and control Product quality, the effect of improving economic effects

Pending Publication Date: 2021-06-01
DAQING OILFIELD CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is to overcome the problem that the indicator in the polymer solution of the existing determination method in the background technology has no obvious color mutation point during the titration pr

Method used

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  • Method for determining hydrolysis degree of partially hydrolyzed polyacrylamide for oil displacement
  • Method for determining hydrolysis degree of partially hydrolyzed polyacrylamide for oil displacement
  • Method for determining hydrolysis degree of partially hydrolyzed polyacrylamide for oil displacement

Examples

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Effect test

Embodiment 1

[0029] Example 1 Detection of the degree of hydrolysis of a certain medium and high-salt-resistant polymer A001 produced by France Eisen Company

[0030] The specific measurement steps are as follows:

[0031] 1. Determination of sample solid content

[0032] Determination method of polymer sample solid content S: according to SY / T 5862-2008.

[0033] 2. Preparation of sample solution

[0034] (1) Weigh (200-1 / S)g of distilled water (accurate to 0.01g) in a 500mL beaker;

[0035] (2) Accurately weigh (1 / S)g sample, accurate to 0.0001g, adjust the rotation speed of the vertical stirrer to (400±20)r / min, make the distilled water form a vortex, slowly and evenly dissolve the sample within 1min Withdraw the sample into the wall of the vortex, continue to stir for 2 hours, and prepare a solution with a concentration of 0.5%;

[0036] (3) Take 40.00 g of a 0.5% solution and 160.00 g of distilled water into a 500 mL beaker, stir with a magnetic stirrer for about 15 minutes until ...

Embodiment 2

[0056] Example 2 Detection of the degree of hydrolysis of a certain high-resolution polymer A002 produced by Daqing Refining and Chemical Company

[0057] The specific measurement steps are as follows:

[0058] 1. Determination of sample solid content

[0059]Determination method of polymer sample solid content S: according to SY / T 5862-2008.

[0060] 2. Preparation of sample solution

[0061] (1) Weigh (200-1 / S)g of distilled water (accurate to 0.01g) in a 500mL beaker;

[0062] (2) Accurately weigh (1 / S)g sample, accurate to 0.0001g, adjust the rotation speed of the vertical stirrer to (400±20)r / min, make the distilled water form a vortex, slowly and evenly dissolve the sample within 1min Withdraw the sample into the wall of the vortex, continue to stir for 2 hours, and prepare a solution with a concentration of 0.5%;

[0063] (3) Take 40.00 g of a 0.5% solution and 160.00 g of distilled water into a 500 mL beaker, stir with a magnetic stirrer for about 15 minutes until ...

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Abstract

The invention relates to a method for determining the hydrolysis degree of partially hydrolyzed polyacrylamide for oil displacement. The method mainly solves the problem that the color of a titration end point is difficult to recognize due to the fact that an indicator in a polymer solution does not have an obvious color mutation point in a titration process in an existing determination method and man-made subjective judgment errors are large. The method is characterized by comprising the steps of (1) measuring the solid content of a polymer sample, and preparing a solution to be measured according to the solid content; (2) dropwise adding a hydrochloric acid standard solution into the prepared solution to be detected, measuring the pH value of the solution, and stopping titration when the pH value reaches 3.5; (3) drawing a pH-V titration curve; and (4) solving a first derivative and a second derivative of the pH-V titration curve, taking the hydrochloric acid consumption corresponding to the maximum point of the obtained first derivative curve and the second derivative d2pH/dV2 being 0 as a titration end point, and calculating to obtain the hydrolysis degree of the sample. According to the method, personal errors caused by unobvious color change of the solution can be basically eliminated, and the detection accuracy and precision are improved.

Description

technical field [0001] The invention relates to the field of oil recovery technology, in particular to a method for measuring the degree of hydrolysis of partially hydrolyzed polyacrylamide for oil displacement. Background technique [0002] The polymer mainly used in oilfield polymer flooding technology is partially hydrolyzed polyacrylamide. The degree of hydrolysis is an important physical and chemical performance index reflecting the quality of polymer products and solution properties. , Viscosity performance, adsorption performance and important parameters of stability performance. At present, the characterization of the degree of hydrolysis of partially hydrolyzed polyacrylamide in China's oil and gas industry standard SY / T5862-2008 and China National Petroleum Corporation's enterprise standard Q / SY 119-2014 is mainly based on the principle of acid-base titration, with 0.1mol / L The sodium carboxylate in the polymer solution is titrated with hydrochloric acid standard ...

Claims

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Application Information

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IPC IPC(8): G01N31/16
CPCG01N31/162
Inventor 马睿冯其原李长庆陈国曹瑞波张晓芹李勃王楠楠张昶曾嘉
Owner DAQING OILFIELD CO LTD
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