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Microorganism for oil displacement and composite type oil displacement agent containing same

A microbial and oil-displacing agent technology, which is applied in the field of enhanced oil recovery in the tertiary oil recovery, can solve the problems of increasing polymer usage, reducing polymer viscoelasticity, and destroying the oil well structure of the oil layer, so as to reduce the interfacial tension of the system and strong salt resistance , the effect of enhancing the recovery rate

Inactive Publication Date: 2013-01-02
GUNGHO CHARGE TIANJIN REFINED PETROLEUM TECH DEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Alkali / polymer / surfactant ASP flooding system can greatly improve oil recovery, but there are also some problems in the process of large-scale industrial application: 1. The use of alkali will cause multivalent ion precipitation, Rock minerals are dissolved, thereby destroying the oil layer and oil well structure, seriously damaging the formation, and the pump barrel needs to be cleaned every 10-15 days, which increases the cost of oil production; 2. The presence of alkali will not only greatly increase the use of polymers, but also It will greatly reduce the viscoelasticity of the polymer, especially the elasticity of the polymer; 3. The use of alkali will also cause the produced fluid to be a W / O emulsion with high viscosity, which not only affects the productivity of the oil well, but also increases the difficulty of demulsification

Method used

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  • Microorganism for oil displacement and composite type oil displacement agent containing same
  • Microorganism for oil displacement and composite type oil displacement agent containing same
  • Microorganism for oil displacement and composite type oil displacement agent containing same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] A composite oil displacement agent, its composition and weight are respectively:

[0045]

[0046] Among them: methyl cellulose M20, as a polymer modifier, can also use sorbitol, xylose, gelatin, reduced gum, soluble starch, sodium methyl cellulose, hydroxyethyl cellulose, hydroxypropyl cellulose, One or more of polyethylene glycol 600, polyethylene glycol 6000, polyvinylpyrrolidone, and polyvinyl alcohol can be replaced by mixing, all of which are commercially available products.

[0047] Isooctylphenol polyoxyethylene ether and polyoxyethylene oleate are nonionic surfactants, and alkylphenol polyoxyethylene ether, fatty alcohol polyoxyethylene ether, nonylphenol polyoxyethylene ether, polyoxyethylene One or more of ethylene glycol octyl phenyl ether, polyoxyethylene oleate, fatty acid polyoxyethylene ether, hexamethyleneimine and polyoxyethylene alkylamine instead of this substance are all yes first product.

[0048] Nonionic-phosphate salt type viscosity reducer...

Embodiment 2

[0057] A composite oil displacement agent, its composition and weight are respectively:

[0058]

[0059] Among them, betaine is a zwitterionic surfactant, and one of carboxybetaine, N-amidocarboxybetaine, N-alkylthiocarboxybetaine, and cocamidopropyl betaine can also be used Or more than two kinds instead, all are the first products.

[0060] The preparation method of the above-mentioned composite oil displacement agent is: microorganism 40g, fatty alcohol polyoxyethylene ether 10g, betaine 4.0g, polyvinylpyrrolidone 4.5g, reducing gum 3.0g, hexamethyleneimine 3.0g, nonionic- Add 3.0g of sulfate-type viscosity reducer, 2.0g of n-butanol and 100g of water into a mixer equipped with a stirring device, and stir at room temperature for 2h.

[0061] Determination of oil-water interfacial tension system:

[0062] Surfactant dosage 0.1% concentration

[0063] Polyacrylamide and clear water (or reinjected sewage) 1000ppm

[0064] Crude oil detection volume

[0065] Experiment...

Embodiment 3

[0067] A composite oil displacement agent, its composition and weight are respectively:

[0068]

[0069] The preparation method of the above-mentioned compound oil displacement agent is: microorganism 40g, reducing gum 1.0g, betaine 16.0g, lauryl amino polyoxyethylene ether phosphate 4.0g, n-propanol 3.0g and clear water to 100g are added to the container In a mixer with a stirring device, stir at room temperature for 2h.

[0070] Determination of oil-water interfacial tension system:

[0071] Surfactant dosage 0.1% concentration

[0072] Polyacrylamide and clean water (or reinjected sewage) 1200ppm

[0073] Crude oil detection volume

[0074] Experimental test results: at a temperature of 45-75°C, a salinity of 1500-20000mg / L, and a DV-II Brookfield viscometer (UL connector) at 30 rpm, the measured viscosity is 18.5mPa.S , using the TX-500C interfacial tension meter, under the condition of rotation speed of 5000 rpm, according to "SY / T5370-1999 Surface and interfacial...

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Abstract

The invention relates to a microorganism for oil displacement, a composite oil displacement agent containing the microorganism and a preparation method thereof. The main components are 20-40% of microorganisms, 6-30% of surfactants, 5-10% of polymer modifiers, Viscosity reducer 1-5%, additive 1-5%, and the rest is added with water to 100%. The preparation method is: adding microorganisms, surfactants, polymer modifiers, viscosity reducers, additives and water into the belt according to the weight ratio. In a reactor with a stirring device, stir at room temperature for 1.5-2.5 hours to obtain the finished product. In the present invention, the compound oil displacement agent of microorganisms and surfactants is formulated by using the mechanism of interaction between various associations and surfactant molecules with complementary structures and good compatibility. The system has high temperature resistance, anti Salt, can reduce crude oil viscosity and reduce oil-water interfacial tension and other properties, and the system meets environmental protection requirements, is suitable for oil extraction, and can significantly increase oil recovery.

Description

technical field [0001] The invention relates to enhanced oil recovery by three oil recovery methods, in particular to a microorganism for oil displacement and a composite oil displacement agent containing the microorganism. Background technique [0002] After the primary and secondary extraction of underground crude oil, more than 40% of the crude oil remains in the formation; if the formation conditions are not ideal, even 80% of the crude oil remains in the formation after the primary and secondary extraction. At present, my country's major oil fields have entered a period of high water cut, and underground crude oil is in a discontinuous state of dispersion. The oil displacement technology mainly uses the synergistic effect of alkali, polymer and surfactant to achieve the effect of increasing oil and reducing water, and improving oil recovery. [0003] Alkali / polymer / surfactant ASP flooding system can greatly improve oil recovery, but there are also some problems in the p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C12N1/20C09K8/582C12R1/01
CPCC09K8/582C12N1/20C12N1/205C12R2001/01
Inventor 杨印海
Owner GUNGHO CHARGE TIANJIN REFINED PETROLEUM TECH DEV