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Binary oil displacement system containing bio-based surfactant and biopolymer and application of binary oil displacement system

A technology of biopolymers and surfactants, applied in the preparation of organic compounds, drilling compositions, chemical instruments and methods, etc., can solve the problems of not being able to fundamentally change the effect of reservoir development and not involving crude oil, etc. Anti-Ca2+ properties, viscosifying and reducing interfacial tension, widening application range

Active Publication Date: 2022-03-15
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Chinese patent CN201610765724.4 only provides the field application of biopolymers in oil well water plugging and water well profile control by preparing biopolymers. Crude oil that reaches deep in the reservoir cannot fundamentally change the reservoir development effect

Method used

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  • Binary oil displacement system containing bio-based surfactant and biopolymer and application of binary oil displacement system
  • Binary oil displacement system containing bio-based surfactant and biopolymer and application of binary oil displacement system
  • Binary oil displacement system containing bio-based surfactant and biopolymer and application of binary oil displacement system

Examples

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preparation example Construction

[0038] Further, the preparation method of biopolymer HS-EPS comprises the following steps:

[0039] 1) Inoculate the Aminomonas strain into the seed medium, and vibrate at 30±5°C for 18±2 hours to obtain the seed liquid;

[0040] Among them, the seed medium includes the following components and mass concentrations: sucrose 30±2g / L, peptone 3±1g / L, K 2 HPO 4 1±0.5g / L, MgSO 4 0.2±0.1g / L, KCl 0.5±0.2g / L, CaCl 2 0.2±0.1g / L;

[0041] 2) Inoculate the seed liquid into the fermentation medium with an inoculation amount of 5 ± 1%, and obtain the fermentation liquid after vibrating at 30 ± 5°C for 72 ± 6 hours;

[0042] Among them, the fermentation medium includes the following components and mass concentrations: maltose 40±2g / L, yeast powder 5±1g / L, K 2 HPO 4 5±1g / L, MgSO 4 0.5±0.2g / L, KCl 2±1g / L, CaCl 2 0.2±0.1g / L;

[0043] 3) Mix the fermented liquid with (2-6) times the volume of 95% ethanol aqueous solution, and let it stand at 4±1°C for 12±2h, after centrifugation, r...

Embodiment 1

[0053] A kind of biopolymer HS-EPS, its preparation method comprises the following steps:

[0054] 1) In the ultra-clean bench, inoculate the Sphingomonas sp.HS strain preserved on the slope into the seed medium with an inoculation loop, and then vibrate at 30°C and 150rpm for 18 hours to obtain the seed solution;

[0055] Wherein, the seed culture medium includes the following components and mass concentrations: sucrose 30g / L, peptone 3g / L, K 2 HPO 4 1g / L, MgSO 4 0.2g / L, KCl 0.5g / L, CaCl 2 0.2g / L, pH≈7.5; Seed medium filling volume: 50mL (250mL container);

[0056] 2) In the ultra-clean bench, inoculate the seed liquid into the fermentation medium with an inoculum amount of 5%, and then vibrate at 30°C and 180rpm for 72h to obtain the fermentation liquid;

[0057] Wherein, the fermentation medium includes the following components and mass concentrations: maltose 40g / L, yeast powder 5g / L, K 2 HPO 4 5g / L, MgSO 4 0.5g / L, KCl 2g / L, CaCl 2 0.2g / L; Fermentation medium ...

Embodiment 2

[0062] A binary oil displacement system, the preparation method comprising:

[0063] Using Daqing simulated formation water as base fluid, prepare 6.0g / L surfactant mother liquor and 9.0g / L biopolymer mother liquor, then mix surfactant mother liquor, biopolymer mother liquor, and Daqing simulated formation water to obtain biological A binary flooding system with a polymer concentration of 3.0 g / L and a surfactant concentration of 0.5 g / L, and a binary flooding system with a biopolymer concentration of 3.0 g / L and a surfactant concentration of 3.0 g / L system.

[0064] Among them, the Daqing simulated formation water includes the following components and mass fractions: NaCl 1588.3mg / L, CaCl 2 112.2mg / L, MgCl 2 42.9mg / L, Na 2 SO 4 17.1mg / L, NaHCO 3 3176.0mg / L, Na 2 CO 3 381.6mg / L.

[0065] Wherein, in the biopolymer mother liquor, the biopolymer used is the biopolymer HS-EPS prepared in Example 1; in the surfactant mother liquor, the surfactant used is the benzyloxy-...

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Abstract

The invention relates to a binary oil displacement system containing a bio-based surfactant and a biopolymer and application of the binary oil displacement system. The binary oil displacement system comprises 0.5-3.0 g / L of the bio-based surfactant and 1-3.0 g / L of the biopolymer. The biopolymer is a biopolymer HS-EPS which is extracted after the fermentation of the Ammomonas; the bio-based surface active agent is a benzyloxy-oleoyl quaternary amine type surface active agent. Compared with the prior art, the method has the advantages that the traditional oil displacement polymer polyacrylamide is replaced by the ammonia alcohol monad biopolymer with excellent salt tolerance, and the obtained binary compound oil displacement system can show ultralow interfacial tension and has better temperature resistance, NaCl resistance, Ca < 2 + > resistance, dilution resistance, adsorption resistance, interfacial tension and viscosity maintenance performance; the surfactant can be applied to high-salinity oil reservoirs, so that the application range of the benzyloxy-oleoyl quaternary amine type surfactant is effectively widened, and the recovery efficiency is further improved on the basis of the characteristic of ultralow interfacial tension.

Description

technical field [0001] The invention belongs to the technical field of petroleum exploitation, and relates to a binary oil displacement system containing bio-based surfactants and biopolymers and an application thereof. Background technique [0002] With the continuous increase of oil demand, polymer flooding technology has attracted the attention of many petroleum workers because of its advantages such as simple process, high oil recovery rate, and environmental friendliness. Compared with the polymer flooding technology, the alkali / surfactant / polymer ASP composite flooding system shows a higher recovery, but the addition of alkali will affect the performance of the polymer to a certain extent, and it is prone to scaling , causing serious damage to oil reservoirs and production equipment, which is not conducive to the further expansion of its application scale. Based on the above reasons, the alkali-free surfactant / polymer SP binary composite flooding system has been paid ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/584C09K8/588C09K8/60C07C303/32C07C309/15C07C231/02C07C235/34C07C51/353C07C59/64C12P5/00
CPCC09K8/584C09K8/588C09K8/602C12P5/005C07C303/32C07C231/02C07C51/353C07C59/64C07C235/34C07C309/15
Inventor 牟伯中刘金峰杨世忠周蕾苗思佳郎剑桥
Owner EAST CHINA UNIV OF SCI & TECH
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