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Oil-resistant foam oil displacing agent as well as preparation method and application thereof

A foam flooding and oil-resistant technology, applied in chemical instruments and methods, drilling compositions, etc., can solve the problems of poor oil resistance and low stability, and achieve good oil resistance, enhanced stability, and reduced residual oil saturation. Effect

Inactive Publication Date: 2018-02-13
ZHEJIANG OCEAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to overcome the problems of poor oil resistance and low stability of existing foam oil displacement agents, the present invention provides an oil-resistant foam oil displacement agent with good stability, high plugging capacity, and environmental protection

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] (1) Weigh the raw materials according to the following proportions: 0.08% of partially hydrolyzed polyacrylamide (molecular weight is 1000-2000), 0.2% of disodium hydrogen phosphate, 0.1% of polyoxyethylene alkyl ether sulfate salt, and the remaining The amount is water; configure a polymer mother liquor with a volume concentration of 4500mg / L, and let it stand for 2 hours for use;

[0030] (2) Measure the polymer mother liquor in the appropriate step (1), and dilute it into a polymer target liquid whose volume concentration is 800mg / L;

[0031] (3) Add disodium hydrogen phosphate to the polymer target liquid in step (2), then add polyoxyethylene alkyl ether sulfate salt, stir at normal temperature at a speed of 100r / min for 2h, and obtain oil-resistant foam flooding Oil agent.

[0032] The oil-resistant foam oil displacement agent of this embodiment is used for tertiary oil recovery in oil reservoirs with a temperature of 30°C, a formation water salinity of 3000 mg / L,...

Embodiment 2

[0034] (1) Weigh raw materials according to the following proportions: 0.15% of partially hydrolyzed polyacrylamide (molecular weight is 1000-2000), 0.4% of disodium hydrogen phosphate, 0.3% of anionic surfactant (α-olefin sulfonate 0.05%, polyoxyethylene alkyl ether sulfate salt 0.01%, polyoxypropylene alkyl ether sulfate salt 0.08%, fatty acid soap 0.02%, pulp waste liquid concentrate 0.05%, sulfurous acid alcohol waste liquid 0.09%), the rest The amount is water; configure a polymer mother liquor with a volume concentration of 5000mg / L, and let it stand for 4 hours for use;

[0035] (2) Measure the polymer mother liquor in the appropriate step (1), and dilute it into a polymer target liquid whose volume concentration is 1500mg / L;

[0036] (3) Add disodium hydrogen phosphate to the polymer target liquid in step (2), then add polyoxyethylene alkyl ether sulfate salt, and stir for 3 hours at a speed of 200r / min at normal temperature to obtain oil-resistant foam flooding Oil a...

Embodiment 3

[0039](1) Weigh raw materials according to the following proportions: 0.1% partially hydrolyzed polyacrylamide (molecular weight is 1000-2000), 0.3% disodium hydrogen phosphate, 0.2% anionic surfactant (dodecylsulfonic acid 0.08% sodium, 0.025% sodium dodecylbenzenesulfonate, 0.075% low-molecular petroleum sulfonate, 0.02% fatty acid soap), and the balance is water; configure a polymer mother liquor with a volume concentration of 4600mg / L, and let it stand for 3h stand-by;

[0040] (2) Measure the polymer mother liquor in the appropriate step (1), and dilute it into a polymer target liquid whose volume concentration is 1000mg / L;

[0041] (3) Add disodium hydrogen phosphate first to the polymer target liquid in step (2), then add polyoxyethylene alkyl ether sulfate salt, stir at a speed of 150r / min at room temperature for 2.5h, and obtain an oil-resistant foam oil repellant.

[0042] The oil-resistant foam oil displacement agent of this embodiment is used for tertiary oil rec...

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Abstract

The invention provides an oil-resistant foam oil displacing agent as well as a preparation method and application thereof. On the basis of total mass of the oil-resistant foam oil displacing agent, the oil-resistant foam oil displacing agent is prepared from the following raw materials in percentage by mass: 0.08% to 0.15% of polymer, 0.2% to 0.4% of inorganic salt additive, 0.1 to 0.3% of anion surfactant, and the balance of water. The oil-resistant foam oil displacing agent has the advantages that the foaming ability is strong, and the oil-resistant property is good; the cost of raw materialis low, the safety is high, the pollution to stratum is avoided, and more green and environment-friendly effects are realized; the oil-resistant foam oil displacing agent is applied to tertiary oil recovery, the operation is convenient, and the oil-resistant property of air foam or nitrogen foam can be effectively enhanced; the conventional foam is fully defoamed when the content of crude oil isgreater than 30%, and the half-life period of the foam is greater than 60min when the content of crude oil is smaller than 50%.

Description

technical field [0001] The invention relates to the technical field of tertiary oil recovery in oil fields, in particular to an oil-resistant foam oil displacement agent with good stability and high plugging capacity, a preparation method and application thereof. Background technique [0002] Most of the old oilfields in eastern my country have entered the late stage of development, and the contradictions in development have become increasingly prominent. At present, polymer flooding and binary flooding are relatively mature tertiary oil recovery technologies, but they are facing the problem of lack of high-quality tertiary recovery resources. Plugging performance and selectivity to oil and water are considered to be a promising tertiary oil recovery method. The application research of foam fluid in oil field has a history of more than 50 years, and it has become an important development direction in the development of oil and gas fields. In recent years, although my country...

Claims

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Application Information

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IPC IPC(8): C09K8/58
Inventor 徐玉朋赵东锋陈玉麟腾智云何凯宁
Owner ZHEJIANG OCEAN UNIV
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