Efficient salt-tolerant high-temperature-resistant oil displacement agent for heavy oil reservoirs and preparation method thereof

A technology for heavy oil reservoirs and high temperature resistance, applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of difficult control of preparation process conditions, difficult to form industrialization, complex reaction steps, etc., to achieve sustainable The effect of low development and production costs and easy control of the reaction

Inactive Publication Date: 2012-10-03
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

Chinese Patent Publication No. "101659860A" "Asymmetric Gemini Oil Displacement Agent for Oil Recovery and Its Preparation Method" [Chen Quansheng] prepares an asymmetric Gemini Sulfonate Oil Displacement Agent; Chinese Patent Publication No. is " CN101684405A "Preparation method of a Gemini long-chain benzyl sulfonate oil displacement agent" [Wang Yu], using N,N-dimethylformamide as raw material to prepare a Gemini long-chain benzyme sulfonic acid Salt oil displacement agent, the preparation method of oil displacement agent proposed by the above patents, has the disadvantages that the preparation process conditions are difficult to control, the reaction steps are complicated, it is difficult to form industrialization, and the application range is limited.

Method used

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  • Efficient salt-tolerant high-temperature-resistant oil displacement agent for heavy oil reservoirs and preparation method thereof
  • Efficient salt-tolerant high-temperature-resistant oil displacement agent for heavy oil reservoirs and preparation method thereof
  • Efficient salt-tolerant high-temperature-resistant oil displacement agent for heavy oil reservoirs and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] raw material:

[0023] Heavy alkane sulfonate 20kg, dodecyl sulfobetaine 15kg, tetradecyl hydroxy sulfobetaine 10kg, diether bisbenzenesulfonate gemini surfactant 9Kg, n-butanol 6kg, water 40kg.

[0024] Preparation steps:

[0025] (1) Under normal temperature and pressure, add heavy alkane sulfonate type anionic surfactant, betaine type amphoteric surfactant, bis(ether bisphenyl) sulfonate gemini surfactant into the reaction kettle, fully stir for 15-30 minute;

[0026] (2) Add 50% of the total water to the reactor and (1) stir for 30 minutes, add co-surfactant, and stir for 30 minutes.

[0027] (3) Finally, add the remaining 50% water and stir well to obtain the finished oil displacing agent.

[0028] Test the product for interfacial tension:

[0029] 1. Test instrument: Model 510 Spinning Drop Interfacial Tensiometer (SY / T5370-1999)

[0030] 2. Temperature: 35C

[0031] 3. Crude oil: experimental standard crude oil (provided by oilfield manufacturers)

[0032]...

Embodiment 2

[0038] raw material:

[0039] Heavy alkane sulfonate 20kg, tetradecyl hydroxy sulfobetaine 14kg, N-(3-tetradecyloxy-2-hydroxypropyl)-N, N dimethyl betaine 10kg, bis-ether bisphenyl Sulfonate gemini surfactant 10Kg, n-butanol 6kg, water 40kg.

[0040] Preparation steps:

[0041] (1) Under normal temperature and pressure, add heavy alkane sulfonate type anionic surfactant, betaine type amphoteric surfactant, bis-ether bisbenzenesulfonate gemini surfactant, and organic solvent into the reaction kettle, and fully stir for 1 -1.5 hours;

[0042] (2) Add 20kg (50% of the total water) into the reaction kettle, stir for 30 minutes, add co-surfactant, stir until uniform, and form an auxiliary agent;

[0043] (4) (3) Finally, add the remaining 50% water (20kg) and stir well to obtain the finished oil displacing agent. Test the product for interfacial tension:

[0044] 1. Test instrument: Model 510 Spinning Drop Interfacial Tensiometer (SY / T5370-1999)

[0045] 2. Temperature: 35°C ...

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Abstract

The invention discloses efficient salt-tolerant high-temperature-resistant oil displacement agent for heavy oil reservoirs and a preparation method thereof. The efficient salt-tolerant high-temperature-resistant oil displacement agent for heavy oil reservoirs is made of, by weigh percent, 10-20% of heavy methane sulfonate, 15-25% of betaine, 3-10% of diether diphenyl sulfonate gemini surfactant, 3-10% of cosurfactant, and 30-40% of water. The efficient salt-tolerant high-temperature-resistant oil displacement agent for heavy oil reservoirs is fine in water solubility and convenient to inject, has no adverse affection on heavy oil reservoirs and is capable of generating no precipitate when instantly cooled to 5 DEG C from higher temperature (105 DEG C), oil-water interface tension is effectively reduced to 10-3mN / m, and the components have no obvious chromatographic separation. In addition, the preparation method is simple, reaction is easy to control, application range is wide, and materials are easy to obtain and low in price.

Description

technical field [0001] The invention relates to the field of an oil displacement agent for heavy oil, salt-resistant, high-temperature, and ultra-low-permeability reservoirs in tertiary oil recovery and a preparation method thereof. Preparation. Background technique [0002] After decades of development in my country's onshore oilfields, most of the remaining reserves are concentrated in high water content, low permeability, heavy oil, high temperature and high salinity reservoirs, and highly heterogeneous fractured-vuggy carbonate rock reservoirs, which are relatively difficult to exploit. In large places, the existing displacement agents can no longer meet the demand for further enhanced oil recovery. At present, polymer flooding is mainly adopted in my country, and the increase rate of its enhanced oil recovery is above 10% OOIP. Polymer flooding is mainly suitable for medium and high permeability oilfields, but its applicable oilfield types are limited, and the effect i...

Claims

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Application Information

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