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Organic base composite oil displacement system suitable for high-calcium oil reservoirs, and preparation method thereof

A compound oil displacement and organic alkali technology, which is applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of fouling in the injection-production system and difficulties in the emulsification of the produced fluid, and achieve high oil displacement efficiency and improved The oil recovery rate and formation damage effect are small

Inactive Publication Date: 2017-02-22
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0020] One of the objectives of the present invention is to provide a method for effectively improving the oil displacement efficiency and increasing the recovery rate of the oil field in the late stage of oil field development, aiming at the problems of serious fouling of the injection-production system caused by high-calcium oil reservoirs and inorganic alkalis and difficulties in the emulsification of the produced fluid. Reserves, an organic-alkali composite flooding system suitable for high-calcium reservoirs to improve the oil recovery of high-calcium reservoirs; the second purpose is to provide a preparation method for this organic-alkali composite flooding system suitable for high-calcium reservoirs

Method used

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  • Organic base composite oil displacement system suitable for high-calcium oil reservoirs, and preparation method thereof
  • Organic base composite oil displacement system suitable for high-calcium oil reservoirs, and preparation method thereof
  • Organic base composite oil displacement system suitable for high-calcium oil reservoirs, and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0053] The preparation method of the organic-alkali composite flooding system suitable for high-calcium reservoirs of the present invention is carried out according to the following steps:

[0054] (1) Take 0.1 kg of partially hydrolyzed polyacrylamide with a viscosity average molecular weight of 30 million and a degree of hydrolysis of 20% and add it to the first mixing container, add water according to the weight concentration of partially hydrolyzed polyacrylamide as 4500 mg / L, and control the temperature of the material at 80 ℃, stirred for 1.5 hours, and matured for 24 hours to obtain a polymer mother liquor;

[0055] (2) Add 0.3 kg of ethanolamine, 0.05 kg of petroleum sulfonate and the remaining amount of water into the second mixing container, then stir at 80°C for 10 minutes to obtain a mixed solution;

[0056] (3) Add the polymer mother liquor in step (1) to the mixed solution in step (2), and stir for 40 minutes to obtain the product.

Embodiment 2

[0058] The preparation method of the organic-alkali composite flooding system suitable for high-calcium reservoirs of the present invention is carried out according to the following steps:

[0059] (1) Take 0.3 kg of partially hydrolyzed polyacrylamide with a viscosity average molecular weight of 15 million and a degree of hydrolysis of 25% and add it to the first mixing container, add water according to the weight concentration of partially hydrolyzed polyacrylamide as 5500 mg / L, and control the temperature of the material at 25 ℃, stirred for 2.5 hours, and matured for 48 hours to obtain a polymer mother liquor;

[0060] (2) Add 0.05 kg of ethanolamine, 0.4 kg of petroleum sulfonate and the remaining amount of water into the second mixing container, then stir at 25°C for 30 minutes to obtain a mixed solution;

[0061] (3) Add the polymer mother liquor in step (1) to the mixed solution in step (2), and stir for 20 minutes to obtain the product.

Embodiment 3

[0063] The preparation method of the organic-alkali composite flooding system suitable for high-calcium reservoirs of the present invention is carried out according to the following steps:

[0064] (1) Take 0.2 kg of partially hydrolyzed polyacrylamide with a viscosity average molecular weight of 22 million and a degree of hydrolysis of 20% and add it to the first mixing container, add water according to the weight concentration of partially hydrolyzed polyacrylamide at 5000 mg / L, and control the temperature of the material at 50 ℃, stirred for 2 hours, and matured for 36 hours to obtain a polymer mother liquor;

[0065] (2) Add 0.2 kg of ethanolamine, 0.2 kg of petroleum sulfonate and the remaining amount of water into the second mixing container, then stir at 50°C for 20 minutes to obtain a mixed solution;

[0066] (3) Add the polymer mother liquor in step (1) to the mixed solution in step (2), and stir for 30 minutes to obtain the product.

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Abstract

The invention provides an organic base composite oil displacement system suitable for high-calcium oil reservoirs, and a preparation method thereof. The organic base composite oil displacement system comprises, by weight, 0.05-0.4% of an anionic surfactant or an anionic-nonionic mixed surfactant, 0.05-0.3% of a hydramine organic alkali, 0.1-0.3% of a water-soluble polymer, and the balance of water. The method for preparing the organic base composite oil displacement system suitable for high-calcium oil reservoirs from above raw materials comprises the following steps: 1, adding the water-soluble polymer into a first mixing container, adding water according to make the weight concentration of the water-soluble polymer reach 4500-5500 mg / L, controlling the temperature at 25-28 DEG C, stirring the polymer and water for 1.5-2.5 h, and slaking the polymer and water for 24-28 h to obtain a polymer mother liquor; 2, adding the hydramine organic alkali, the anionic surfactant or the anionic-nonionic mixed surfactant and remaining water into another mixing container, and stirring above materials at 25-80 DEG C for 10-30 min to obtain a mixed solution; and 3, adding the polymer mother liquor obtained in step 1 to the mixed solution obtained in step 2, and stirring the liquor and the solution for 20-40 min to obtain the organic base composite oil displacement system.

Description

[0001] Technical field: [0002] The invention relates to the technical field of oil field recovery, in particular to an organic-alkali composite flooding system suitable for high-calcium reservoirs and a preparation method thereof. [0003] Background technique: [0004] Composite flooding refers to the combination of two or more oil displacement components. One of the more popular chemical flooding is alkali / surfactant / polymer (ASP) ASP flooding. The concentrations of various chemical agents used are relatively low. This method is derived from alkali flooding. The added alkali can It reacts with acidic substances in petroleum to generate a surfactant, which can produce a favorable synergistic effect with the added surfactant, greatly reducing the oil-water interfacial tension. This method has been proved by mine experiments that it can increase the recovery rate by more than 20%, while polymer flooding can only increase the recovery rate by about 10%, so it is a promising oi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/58
CPCC09K8/58
Inventor 孙焕泉李振泉杨勇曹绪龙郭兰磊张继超郭淑凤王红艳潘斌林于群王丽娟刘煜石静李青华单联涛
Owner CHINA PETROLEUM & CHEM CORP
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