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A kind of method and device for determining thermal stability of polymer cross-linked gel

A technology for cross-linking gels and determining methods, which is applied to measuring devices, instruments, and nuclear magnetic resonance analysis. It can solve the problems of heavy workload and difficult to meet the requirements of rapid evaluation of gel systems, and achieve accurate results. The effect of relatively small error

Active Publication Date: 2022-03-29
PETROCHINA CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] This method needs to repeatedly measure the strength or viscosity of the gel, the workload is heavy, and it is difficult to meet the requirements of rapid evaluation of the gel system

Method used

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  • A kind of method and device for determining thermal stability of polymer cross-linked gel
  • A kind of method and device for determining thermal stability of polymer cross-linked gel
  • A kind of method and device for determining thermal stability of polymer cross-linked gel

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Embodiment 1

[0075] This embodiment provides a method for determining the thermal stability of a polymer cross-linked gel, the method comprising the following steps:

[0076] A number of polyacrylamide gel samples were prepared, and the raw materials of the samples were as follows: the mass fraction of acrylamide (AM) was 5%, the mass fraction of ammonium persulfate was 0.02%, the mass fraction of N,N-methylenebisacrylamide (BIS) A fraction of 0.05% and the balance water;

[0077] Aging at 150°C for 0.5h, 1h, 1.5h, and 2h respectively, and extracting the solid phase of the gel after aging;

[0078] The T of the gel was obtained using NMR and MSE-CPMG sequence acquisition 2 Relaxation time curve and analysis to obtain the degree of cross-linking of the gel under each aging time;

[0079] The relationship curve of crosslinking degree with aging time is as follows: Figure 5 As shown, and using the power function to fit, the fitting function shown below is obtained;

[0080] τ=0.77×t -0....

Embodiment 2

[0084] This embodiment provides a method for determining the thermal stability of a polymer cross-linked gel, the method comprising the following steps:

[0085] Prepare a plurality of polyacrylamide gel samples, and the raw material composition of sample is: the mass fraction of AM is 5%, the mass fraction of ammonium persulfate is 0.02%, the mass fraction of BIS is 0.1% and the water of balance;

[0086] Aged at 150°C for 0.5h, 1h, 1.5h, and 2h, respectively, and obtained the cross-linking degree of the gel at each aging time by using nuclear magnetic resonance method and MSE-CPMG sequence acquisition;

[0087] The curve of crosslinking degree with aging time is as follows: Figure 7 As shown, and using the power function to fit, the fitting function shown below is obtained;

[0088] τ=0.827×t -0.232 ;

[0089] Among them, τ is the degree of cross-linking, dimensionless; t is the aging time, h; the correlation coefficient R of the fitting relationship 2 is 0.999.

[009...

Embodiment 3

[0092] This embodiment provides a method for determining the thermal stability of a polymer cross-linked gel, the method comprising the following steps:

[0093] Prepare a plurality of polyacrylamide gel samples, the raw material composition of sample is: AM mass fraction is 5%, ammonium persulfate mass fraction is 0.02%, BIS mass fraction is 0.05% and the balance water;

[0094] Aged at 130°C for 0.5h, 1h, 1.5h, and 2h, respectively, and obtained the crosslinking degree of the gel at each aging time by using nuclear magnetic resonance method and MSE-CPMG sequence acquisition;

[0095] The curve of crosslinking degree with aging time is as follows: Figure 9 As shown, and using the power function to fit, the fitting function shown below is obtained;

[0096] τ=0.787×t -0.139 ;

[0097] Among them, τ is the degree of cross-linking, dimensionless; t is the aging time, h; the correlation coefficient R of the fitting relationship 2 is 0.999.

[0098] According to the function...

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Abstract

The invention provides a method and device for determining the thermal stability of polymer cross-linked gel. The determination method includes: obtaining the cross-linking degree of the polymer cross-linked gel at different aging times; drawing a relationship curve between the cross-linking degree and the aging time to obtain a fitting function; according to the fitting function, determining the cross-linking degree of the polymer cross-linking gel effective time for thermal stabilization. The determining device includes: a parameter obtaining module; a function obtaining module; and a determining module. The determination method and device of the present invention can quickly and accurately determine the effective time of thermal stability of the polymer cross-linked gel.

Description

technical field [0001] The invention relates to a method and a device for quickly determining the thermal stability of polymer crosslinked gel, belonging to the technical field of oil field chemistry. Background technique [0002] With the continuous development of water injection in my country's oilfields, the heterogeneity of reservoirs has become increasingly prominent, resulting in water injection failure or ineffective circulation. Therefore, most oilfields need profile control and water shutoff operations. The use of polymer cross-linked gel to plug high-permeability layers has become the most commonly used method for profile control and water plugging in oilfields. However, with the further development of conventional oil reservoirs, the burial depth of oil layers is increasing, and the reservoir temperature (>100℃), salinity (>1.0×10 5 mg / L) is also getting higher and higher, such as Tarim Oilfield, Tahe Oilfield and other oilfields, for profile control and wa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N24/08G01N33/00
CPCG01N24/08G01N33/00
Inventor 魏发林刘平德熊春明卢拥军吕静李伟涛
Owner PETROCHINA CO LTD
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