Oil displacement agent suitable for surfactant for low-permeability oilfield, and preparation method thereof

The technology of surfactant flooding and surfactant is applied in the field of oil displacement agent and its preparation, which can solve the problems of not being able to obtain the super oil-water interfacial tension required for oil displacement, blocking formation pores, and destroying formation structure, etc. Conducive to sustainable development, avoiding damage, and maintaining stable performance

Inactive Publication Date: 2009-06-03
合肥新星油田化学剂有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, petroleum sulfonate surfactants are the main additives of oil displacement agents that are widely used in oil fields. However, due to the complex reservoir conditions and the production cost of oil fields, the primary technical requirement for oil displacement agents is oil / The interfacial tension of water is 1×10 -3 mN / m, petroleum sulfonate generally can only reduce the oil / water interfacial tension to 1×10 -2 On the order of mN / m, the super oil-water interfacial tension required for oil displacement cannot be obtained
In order to pursue low oil-water interfacial tension, the traditional oil displacement agent does not pay attention to reservoir geology and crude oil physical properties, and adds a certain amount of alkali (NaOH) or polymer, because alkali (NaOH) or polymer is largely absorbed in the formation Adsorption blocks the pores of the formation, resulting in the destruction of the formation structure and bringing great difficulties to further mining

Method used

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  • Oil displacement agent suitable for surfactant for low-permeability oilfield, and preparation method thereof
  • Oil displacement agent suitable for surfactant for low-permeability oilfield, and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] raw material:

[0039] Heavy alkylbenzene sulfonate 40kg, nonylphenol polyoxyethylene ether 8kg, sorbitol polyoxyethylene ether 10kg, sulfonate Gmini surfactant 10kg, n-butanol 2kg, water 30kg.

[0040] Preparation steps:

[0041] (1), under normal temperature and pressure, under normal temperature and pressure, add anionic sulfonate Gmini surfactant, nonionic surfactant and organic solvent into the reaction kettle, and fully stir for 3 hours;

[0042] (2), add 50% of the total water into the reaction kettle, stir for 2 hours, add the remaining water and all organic solvents, stir until uniform, and form an auxiliary agent;

[0043] (3) Finally, add the heavy alkylbenzene sulfonate into the reactor, and mix it evenly with the auxiliary agent to obtain the finished oil displacement agent.

[0044] Test the product for interfacial tension

[0045] 1. Test instrument: 510 spinning drop interfacial tensiometer (SY / T5370-1999)

[0046] 2. Temperature: 50°C

[0047] 3. C...

Embodiment 2

[0053] raw material:

[0054]α-olefin sulfonate 40kg, nonylphenol polyoxyethylene ether 8kg, sorbitol polyoxyethylene ether 10kg, sulfonate Gmini surfactant 10kg, n-butanol 2kg, water 30kg.

[0055] Preparation steps:

[0056] (1), under normal temperature and pressure, under normal temperature and pressure, add anionic sulfonate Gmini surfactant, nonionic surfactant and organic solvent into the reaction kettle, and fully stir for 3 hours;

[0057] (2), add 50% of the total water into the reaction kettle, stir for 2 hours, add the remaining water and all organic solvents, stir until uniform, and form an auxiliary agent;

[0058] (3) Finally, add the α-olefin sulfonate into the reactor, and mix it evenly with the auxiliary agent to obtain the finished oil displacement agent.

[0059] Test the product for interfacial tension

[0060] 1. Test instrument: 510 spinning drop interfacial tensiometer (SY / T5370-1999)

[0061] 2. Temperature: 80°C

[0062] 3. Crude oil: experimenta...

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Abstract

The invention relates to an oil displacement agent suitable for surfactant for low-permeability oilfield, and a preparation method thereof, which belongs to the chemical-flooding field for improving the oil recovery factor of the oil pool. The oil displacement agent mainly comprises the component of heavy alkylbenzene sulfonate or alpha-alkene sulfonate, and the heavy alkylbenzene sulfonate or the alpha-alkene sulfonate is matched with sulfonate Gemini type surfactant, nonionic surfactant, organic solvent and water to form a mixed system. Compared with the prior art, the invention has the advantages that the oil solubility of the efficient compound oil displacement agent is good, the service temperature is high, no influence exists in the oilfield and the oil pool, and the tension of the oil water interface can be effectively reduced at higher temperature (80 DEG C) and reaches 10<-3>mN / m; and the bivariate compound displacement system formed with the polymer can increase the recovery ratio by above 20 percent of OOIP and has broad application prospect.

Description

technical field [0001] The invention relates to an oil displacing agent and a preparation method thereof. Background technique [0002] After decades of development in my country's onshore oilfields, most of the oilfields have entered the stage of ultra-high water cut, with a comprehensive water cut above 90%. Major oilfields in China have generally carried out field tests and industrial applications of tertiary oil recovery, and achieved remarkable results. results. In the method of tertiary oil recovery, the main method at present is polymer flooding, and the increase rate of its enhanced oil recovery is above 10% OOIP. In addition, surfactant flooding is also being promoted and applied. Because polymer flooding is mainly suitable for medium and high permeability oil fields, the types of oil fields it can be used for are limited, and it cannot be used for low pressure, low permeability oil fields and heavy oil fields. Therefore, surfactant flooding (including surfactant / ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/584
Inventor 朱仁发赵磊程国柱王俊
Owner 合肥新星油田化学剂有限责任公司
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