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Alkali-free oil displacement agent with high temperature resistance and high salinity and preparation method thereof

A technology with high salinity and high temperature resistance, which is applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of unfavorable environmental protection, non-environmental protection, high cost, etc., and achieve environmental protection and strong salt resistance , The effect of low raw material cost

Active Publication Date: 2018-09-04
CHINA RES INST OF DAILY CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Patent CN 103254883 A discloses a high-temperature-resistant, high-salt and high-hardness oil-displacing agent, whose main components are amine oxide-type amphoteric surfactants and alkylphenol polyoxyethylene ether carboxylate surfactants; patent CN 104087276 A discloses a salt-resistant and high-temperature-resistant oil displacement agent, the main components of which are alkylbenzene sulfonate, amido betaine and diether bisbenzene sulfonate gemini surfactant; patent CN 102703048 A discloses a A high-efficiency salt-resistant and high-temperature heavy oil displacement agent, its main components are heavy alkyl benzene sulfonate, betaine, bis-ether bis-benzene sulfonate gemini surfactant, etc.; patent CN104531120 A discloses a biosurface The active agent is an environmentally friendly salt-resistant and high-temperature oil-displacing agent, and its main components are Bacillus subtilis fatty sodium and tea saponin modifier; the amphoteric surfactants in these oil-displacing agents are high in cost, which is not conducive to large-scale industrial use
Patent CN 102766448 A discloses a high-temperature-resistant, high-salt-resistant foam oil displacement agent, whose main components are sodium polyalkylbenzene sulfonate, other surfactants, tetrakis phosphonium sulfonate and Tween-20; Phosphorus-containing organic compounds are introduced into this type of oil displacement agent, which will cause eutrophication of soil and water, which is not conducive to environmental protection
[0004] The above-mentioned prior art has the disadvantages of high cost and no environmental protection

Method used

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  • Alkali-free oil displacement agent with high temperature resistance and high salinity and preparation method thereof
  • Alkali-free oil displacement agent with high temperature resistance and high salinity and preparation method thereof
  • Alkali-free oil displacement agent with high temperature resistance and high salinity and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Oil displacement agent composition: 8wt% alkyl diphenyl ether sulfonate (m=12, n=0), 15wt% fatty alcohol polyoxyethylene ether sulfonate (m=8, n=3), 1wt% α-olefin sulfonate (AOS), 1 wt% of AEO-7, and the rest is water.

[0031] Preparation steps:

[0032] (1) At room temperature, add alkyl diphenyl ether sulfonate (m=12, n=0) and fatty alcohol polyoxyethylene ether sulfonate (m=8, n=3) into the reactor and stir.

[0033] (2) Add 1 / 2 of the total amount of water into the reactor, and continue stirring for 15 minutes.

[0034] (3) Add co-surfactants AOS and AEO-7 and stir for 30 minutes.

[0035] (4) Finally, add the remaining water and stir well to obtain the oil displacing agent.

[0036] The water is formation water with total salinity of 180000mg / L and total calcium and magnesium ions of 10000mg / L.

[0037] Add the oil displacement agent prepared above into the formation water, stir evenly, and prepare a solution with an active substance concentration of 1.2 g / L. ...

Embodiment 2

[0040] Oil displacement agent composition: 14wt% alkyl diphenyl ether sulfonate (m=10, n=10), 5wt% fatty alcohol polyoxyethylene ether sulfonate (m=12, n=5), 1wt% HABS, 3wt% AEO-7, 5wt% ethanol, and the rest is water.

[0041] Preparation steps:

[0042] (1) At room temperature, add alkyl diphenyl ether sulfonate (m=10, n=10) and fatty alcohol polyoxyethylene ether sulfonate (m=12, n=5) into the reactor and stir.

[0043] (2) Add 1 / 2 of the total amount of water into the reactor, and continue stirring for 30 minutes.

[0044] (3) Add ethanol, co-surfactant HABS and AEO-7, and stir for 30 minutes.

[0045] (4) Finally, add the remaining water and stir well to obtain the oil displacing agent.

[0046] Formation water is the formation water with total salinity of 150000mg / L and total calcium and magnesium ions of 8400mg / L.

[0047] Add the oil displacement agent prepared above into the formation water, stir evenly, and prepare a solution with an active substance concentration...

Embodiment 3

[0050] Oil displacement agent composition: 25wt% alkyl diphenyl ether sulfonate (m=16, n=0), 5wt% fatty alcohol polyoxyethylene ether sulfonate (m=14, n=7), 2wt% IOS, 2wt% AEO-9, 3wt% ethanol, and the rest is water.

[0051] Preparation steps:

[0052] (1) At room temperature, add alkyl diphenyl ether sulfonate (m=16, n=0) and fatty alcohol polyoxyethylene ether sulfonate (m=14, n=7) into the reactor and stir.

[0053] (2) Add 1 / 2 of the total amount of water into the reactor, and continue to stir for 20 minutes.

[0054] (3) Add ethanol, co-surfactant IOS and AEO-9, and stir for 30 minutes.

[0055] (4) Finally, add the remaining water and stir well to obtain the oil displacing agent.

[0056] The water is formation water with total salinity of 150000mg / L and total calcium and magnesium ions of 8400mg / L.

[0057] Add the oil displacement agent prepared above into the formation water, stir evenly, and prepare a solution with an active substance concentration of 1.2 g / L.

[...

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Abstract

The invention discloses an alkali-free oil displacement agent with high temperature resistance and high salinity. The alkali-free oil displacement agent comprises the following components in percentage by mass: 8-25% of alkyl diphenyl ether sulfonate, 5-15% of fatty alcohol polyoxyethylene ether sulfonate, 2-5% of a co-surfactant, 0-5% of an organic solvent and the balance of water. The alkali-free oil displacement agent provided by the invention has the advantages of low cost, environmental protection, high temperature resistance and high salinity.

Description

technical field [0001] The invention relates to an alkali-free oil displacement agent with high temperature resistance and high salinity and a preparation method. Background technique [0002] Many oilfields in my country have high formation water salinity and high reservoir temperature. Conventional oil displacement agents are easy to decompose or precipitate under high temperature and high salinity, which cannot meet the needs of mining; alkali injection will cause formation clay to disperse and migrate, resulting in The permeability of the formation decreases, and it is easy to scale and block the well under the condition of high salinity. Therefore, it is necessary to develop an alkali-free oil displacement agent with high temperature resistance and high salinity. [0003] Patent CN 103254883 A discloses a high-temperature-resistant, high-salt and high-hardness oil-displacing agent, whose main components are amine oxide-type amphoteric surfactants and alkylphenol polyoxy...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/584
CPCC09K8/584
Inventor 霍月清刘晓臣白龙牛金平韩亚明韩向丽
Owner CHINA RES INST OF DAILY CHEM IND
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