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Hydrophobic association polymer-based ternary composite displacement system

A hydrophobic association, polymer technology, applied in drilling compositions, chemical instruments and methods, etc., can solve the problems affecting the large-scale application of ASP oil flooding technology, the improvement rate is not large, and it is not suitable for application, etc. The effect of good interfacial tension stability, uniform pressure gradient and good conductivity

Inactive Publication Date: 2010-11-24
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

High concentration first brings high cost. Taking the currently used ternary composite system as an example, its cost is already 4-5 times higher than that of polymer flooding
Secondly, it requires partially hydrolyzed polyacrylamide to have an ultra-high molecular weight, which not only brings greater technical difficulties and a substantial increase in cost, but also from the current synthesis technology, the molecular weight of partially hydrolyzed polyacrylamide The further improvement rate is not very large
In addition, for medium and low permeability oil layers, this ultra-high molecular weight polymer is not suitable for application. These factors have seriously affected the large-scale application of ASP flooding technology.

Method used

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  • Hydrophobic association polymer-based ternary composite displacement system
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  • Hydrophobic association polymer-based ternary composite displacement system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Embodiment 1, artificial homogeneous rock core flooding experiment

[0027] From the experimental results in Table 1, it can be seen that the application of hydrophobic association polymers can improve the ability of the three-component system to further enhance the recovery after polymer flooding while reducing the dosage. Table 1 shows that after polymer flooding on artificial homogeneous cores, the recovery rate can be increased by 16%, which is 8% higher than that of the partially hydrolyzed polyacrylamide ternary composite system with the same system viscosity.

[0028] Table 1. Experimental results of ternary system artificial homogeneous core flooding

[0029]

Embodiment 2

[0030] Embodiment 2, natural rock core (length 7.5-7.7cm) flooding experiment

[0031] Table 2 shows that in the verification process of natural core flooding experiments, the enhanced recovery value of the present invention after polymer flooding is similar to that of the ternary composite system of partially hydrolyzed polyacrylamide with the same system viscosity, but the amount of polymer used is much lower than that of some Hydrolyzed polyacrylamide, that is, use less than 850 mg per liter of solution, which is only equivalent to 2 / 3 of its dosage. Through the comparison of the experimental results in Table 2 and Table 3, it is found that the effect of enhancing oil recovery by using hydrophobic association polymer alone after polymer flooding is significantly worse than that of the hydrophobic association polymer ternary system.

[0032] Table 2 Results of oil displacement experiment of ternary system natural core (length 7.5-7.7cm)

[0033]

[0034] Table 3 Experime...

Embodiment 3

[0036] Embodiment 3, natural rock core (length 13.5-13.8cm) flooding experiment

[0037] During the verification process of natural core flooding experiments (Table 2), it was found that when the core length is short, the enhanced oil recovery after polymer flooding is reduced to 8%-9%. caused by low interfacial tension. So we lengthened the natural core to 13.5cm, and found that the enhanced oil recovery after polymer flooding reached 13% (Table 4), which is close to the experimental results of artificial homogeneous core, and the effect is better.

[0038] Table 4 Results of oil displacement experiments on ternary system natural cores (length 13.5-13.8cm)

[0039]

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Abstract

The invention discloses a hydrophobic association polymer composite displacement operating fluid-based system in tertiary oil recovery. The system mainly comprises the following components in percentage by weight: 0.08 to 0.16 percent of hydrophobic association polymer, 0.05 to 0.3 percent of surfactant, 0.8 to 1.2 percent of alkali and 98.34 to 99.07 percent of water. A polymer is used as the hydrophobic association polymer of a product which can be industrially produced, the working concentration of the product is lower than that of partially hydrolyzed polyacrylamide commonly used for a tertiary composite displacement and the production cost is low. The product has relatively high viscosity and ultra-low interfacial tension under a relatively low concentration of the polymer and the alkali; and the solution can be prepared by using common water or polymer-containing sewage and has high environment protection benefit and economical benefit.

Description

[0001] Involved areas [0002] The present invention relates to the composite flooding system in tertiary oil recovery, specifically, it is a kind of ASP flooding system based on hydrophobic association polymer applied in tertiary oil recovery technical background [0003] ASP flooding refers to the composite flooding system composed of alkali / surfactant / polymer (ASP), which is based on the binary composite system (surfactant (micelle) / polymer, alkali / polymer). A new method of tertiary oil recovery developed on the basis of The base is usually an inorganic base, such as NaOH, Na 2 CO 3 、Na 2 SiO 3 wait. Surfactants are generally alkylbenzene sulfonates. The polymer is partially hydrolyzed polyacrylamide or other polymers such as hydrophobic association polymers or the biopolymer xanthan gum. Laboratory and field studies have shown that the recovery rate of the ternary compound system can be increased by more than 20% on the basis of water flooding. (Chao Huaqing. Resea...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/588
CPCC09K8/58
Inventor 冯茹森柯强张新民郭拥军杨爱武
Owner SOUTHWEST PETROLEUM UNIV
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