Nanocomposite viscoelastic oil displacement agent produced on line

An oil displacing agent and composite technology, which is applied in the field of nano-composite viscoelastic oil displacing agent, can solve the problems of difficult to reach the expected value of injectability, inability to inject online, and increase cost input, so as to reduce the cost of chemicals and operations, improve the Transport performance, the effect of reducing construction equipment

Inactive Publication Date: 2021-11-05
CHINA OILFIELD SERVICES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the above research is mainly on polymer flooding technology and conventional polymer-based control and displacement agents. For high-salinity oilfields, salt-resistant polymers need to be used, which increases cost and cannot be injected online, and the injectivity is difficult to meet expectations value

Method used

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  • Nanocomposite viscoelastic oil displacement agent produced on line
  • Nanocomposite viscoelastic oil displacement agent produced on line
  • Nanocomposite viscoelastic oil displacement agent produced on line

Examples

Experimental program
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Effect test

Embodiment 1-1

[0085] The oil displacement agent of the present embodiment is the injection aqueous solution that surfactant concentration is 0.5%, and wherein surfactant is PEHSB, EHSB, hexadecylamide propyl hydroxypropyl sulfonate that weight ratio is 72:18:6:4 betaine and tetradecylpropyl sultaine. The oil displacement agent system of this embodiment is 100mL.

[0086] The preparation method of the oil displacement agent of the present embodiment is: first mix PEHSB, EHSB, hexadecyl amidopropyl hydroxypropyl sultaine and myristyl propyl sultaine in proportion, then mix 0.5 The g mixture was dissolved in injection water, stirred at a constant temperature of 60° C. for 30 minutes, and 100 mL of an oil-displacing agent with a surfactant concentration of 0.5% was prepared.

Embodiment 1-2

[0088] The oil displacement agent of the present embodiment is the injection aqueous solution that surfactant concentration is 0.5%, and wherein surfactant is by weight ratio PEHSB, EHSB, hexadecyl amidopropyl hydroxypropyl sulfonate of 67.5:22.5:6:4 Composed of betaine and tetradecylpropyl sultaine. The oil displacement agent system of this embodiment is 100mL.

[0089] The preparation method of the oil displacement agent of this embodiment is the same as that of Example 1-1, the only difference is that PEHSB, EHSB, cetyl amidopropyl hydroxypropyl sultaine and tetradecyl propyl sultaine The proportion of alkali is adjusted adaptively.

Embodiment 1-3

[0091] The oil displacement agent of the present embodiment is the injection aqueous solution that surfactant concentration is 0.5%, and wherein surfactant is PEHSB, EHSB, hexadecylamide propyl hydroxypropyl sulfonate that weight ratio is 45:45:6:4 Composed of betaine and tetradecylpropyl sultaine. The oil displacement agent system of this embodiment is 100mL.

[0092] The preparation method of the oil displacement agent of this embodiment is the same as that of Example 1-1, the only difference is that PEHSB, EHSB, cetyl amidopropyl hydroxypropyl sultaine and tetradecyl propyl sultaine The proportion of alkali is adjusted adaptively.

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Abstract

The invention provides a nanocomposite oil displacement agent produced on line. The nanocomposite oil displacement agent comprises 0.05-0.8% of a surfactant, with the balance being water, wherein the surfactant comprises erucamide propyl hydroxy sulfobetaine or erucylamide propyl betaine, hexadecylamide propyl hydroxy propyl sulfobetaine and myristyl propyl sulfobetaine. The composite oil displacement agent disclosed by the invention may also comprises at least one selected from tetradecylamide propyl hydroxypropyl sulfobetaine and hexadecyl propyl sulfobetaine, and / or nanometer silicon dioxide with content of not more than 0.05%, and / or sodium dodecyl benzene sulfonate with content of not more than 0.03%, and / or 0.05 to 0.1% of polyether diamine and 0.05 to 0.1% of salicylic acid. For oil reservoirs with different mineralization degrees and permeability, the viscosity and interfacial tension of the nanocomposite viscoelastic oil displacement agent disclosed by the invention in an oil layer are controllable; and inorganic ions in stratum injection water are fully utilized under the condition of ensuring online injection.

Description

technical field [0001] The invention relates to the technical field of balanced oil displacement of offshore continental sandstone reservoirs, in particular, the invention relates to a nanocomposite viscoelastic oil displacement agent produced on-line. Background technique [0002] At present, the effective means to improve the development effect of oilfield water flooding is to expand the swept volume of injected water. However, as the oilfield gradually enters the medium-high water-cut or ultra-high water-cut development stage, the remaining oil-enriched areas are distributed in the deep formations, and the original near-wellbore profile control technology has been difficult to meet the needs of deep liquid flow diversion in the mine. In addition, for reservoirs with strong heterogeneity or high salinity, the injectability or salt resistance of existing conventional polymer gels is difficult to meet the environmental requirements, and the cost of salt-resistant modified po...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/584
CPCC09K8/584
Inventor 李翔于萌铁磊磊
Owner CHINA OILFIELD SERVICES
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