Method for reducing component loss and formation damage in high-temperature combined chemical flooding process

A technology of combined oil displacement and high temperature chemistry, which is applied in the direction of chemical instruments and methods, earthwork drilling, drilling composition, etc., can solve the problem of not being able to effectively meet the start-up residual oil, unable to guarantee the deep oil displacement effect of the reservoir, and not disclosed Compatibility of organic bases with polymers and surfactants

Inactive Publication Date: 2015-08-05
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The binary system of polymer and surfactant can improve the oil displacement efficiency and sweep efficiency at the same time, but the main problem is that the adsorption loss of the two on the rock surface is relatively large, so the oil displacement effect in the deep reservoir cannot be guaranteed ; Simultaneously, generally low dosage (0.3%) surfactant can only reduce oil-water interfacial tension to 10 -2 mN / m, according to the capillary number theory and formation pore throat size, it cannot effectively meet the requirements of start-up residual oil, and the high cost and large amount of surfactants restrict their practical application in mines
In the existing literature reports, there is no disclosure of the compatibility of organic bases with polymers and surfactants in high-temperature reservoir flooding and their ability to reduce adsorption losses and formation damage

Method used

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  • Method for reducing component loss and formation damage in high-temperature combined chemical flooding process
  • Method for reducing component loss and formation damage in high-temperature combined chemical flooding process
  • Method for reducing component loss and formation damage in high-temperature combined chemical flooding process

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0129] Step 2 measurement result is:

[0130] The dynamic curves of oil-water interfacial tension under different concentrations of triethylamine and ethanolamine, diethanolamine, and triethanolamine are as follows: figure 1 .

[0131] From the dynamic curve of interfacial tension, it can be seen that after the compounding of triethylamine and surfactant, it is still 10 -2 On the order of mN / m, ultra-low interfacial tension cannot be achieved, while ethanolamine obviously reaches 10 -3 On the order of mN / m, although the oil-water interfacial tension of the diethanolamine and triethanolamine compound system is not as low as that of ethanolamine, it can still reach 10 -3 mN / m. Therefore, ethanolamine, diethanolamine, and triethanolamine can be selected for key investigation.

Embodiment 2

[0133] Step 3 measurement result is:

[0134] Comparison example of three kinds of organic bases with different concentrations of ethanolamine, diethanolamine and triethanolamine and weak base sodium carbonate to reduce interfacial tension figure 2 . figure 2 The middle black line represents the oil-water interfacial tension of 3000mg / L surfactant single agent 6.61×10 -3 mN / m.

[0135] It can be seen that the oil-water interfacial tension value of the 3000mg / L active agent SH-6 solution without alkali is 6.61×10 -3mN / m, the addition of three organic bases can improve the interfacial tension to varying degrees, among which ethanolamine has the most obvious effect, and the interfacial tension can be reduced in the concentration range of 1000mg / L-12000mg / L. After the concentration is greater than 8000mg / L, The interfacial tension was reduced to 10 -4 mN / m order of magnitude; only when the concentration of diethanolamine is greater than 8000mg / L and the concentration of trie...

Embodiment 3

[0137] Step 4 measurement result is:

[0138] The comparison of the properties of the three organic bases ethanolamine, diethanolamine and triethanolamine is shown in Table 1.

[0139] Ethanolamine has the best solubility, is miscible with water, and has the lowest cost. Compared with other physical and chemical properties, the three organic bases have little difference. Based on the interfacial tension and the above properties, ethanolamine was selected as an organic base to form a chemical flooding composite system with surfactants and polymers, and its interfacial tension, alkali consumption and formation damage were further systematically evaluated.

[0140] Table 1 Comparison of three kinds of organic alkali properties

[0141]

[0142]

[0143]

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Abstract

Disclosed is a method for reducing the component loss and formation damage in a high-temperature combined chemical flooding process. By the adoption of the method, a composite system which comprises organic alkali ethanolamine, a surface active agent SH-6 and a polymer of partially hydrolyzed polyacrylamide is used for conducting oil flooding operation in an oil layer at the temperature ranging from 85 DEG C to 95 DEG C, wherein the concentration of the organic alkali ethanolamine ranges from 3000mg / L to 12000mg / L, the concentration of the surface active agent SH-6 ranges from 2000mg / L to 4000mg / L, and the concentration of the partially hydrolyzed polyacrylamide ranges from 1000mg / L to 2500mg / L. The damage of the composite system to a formation and the adsorption loss of the polymer and the surface active agent can be reduced under the condition of a high-temperature oil reservoir and the condition that the ASP composite system is enabled to achieve ultralow interfacial tension, and therefore the application range of the ASP composite system is further broadened, and the foundation basis and the technical thinking are provided for application of a high-temperature combined flooding system.

Description

technical field [0001] The invention belongs to the technical field of oil and gas production enhancement, and relates to a method for reducing component loss and formation damage in the process of high-temperature chemical compound flooding. Background technique [0002] The ASP flooding technology was produced in the early 1980s. The ASP flooding method is a combination system (ASP) composed of alkali, surfactant and polymer. It is a combination of alkali flooding, surfactant flooding and polymer A new technology for greatly enhancing oil recovery developed on the basis of physical flooding, the essence of which is to partially replace expensive surfactants with cheap inorganic alkalis. Based on the synergistic effect of three kinds of displacement agents, ASP flooding comprehensively exerts the role of chemical agents, fully improves the utilization efficiency of chemical agents, and greatly reduces the dosage of chemical agents, especially surfactants, making it highly e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/22C09K8/584C09K8/588
Inventor 赵凤兰侯吉瑞
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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