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Temperature-resistant salt-resistant composite foam oil displacement agent for tertiary oil recovery and preparation method thereof

A composite foam, temperature-resistant and salt-resistant technology, applied in drilling compositions, chemical instruments and methods, etc., can solve problems such as damage, and achieve the effects of low production cost, reduced oil-water interfacial tension, and strong salt resistance.

Inactive Publication Date: 2011-06-08
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, ASP flooding (alkali-polymer-surfactant) is developed on the basis of alkaline water flooding and polymer flooding, and is currently the most widely used oil displacement method. The large amount of alkali contained in it has brought great damage to the formations and oil wells near the oil field.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Example 1: Raw materials: α-olefin sulfonate 50g, sodium cocoyl sulfate 12g, lauryl dihydroxyethyl ammonium oxide 26g, ethanol 250g, Tween 20 600g, sodium chloride 270g, anhydrous calcium chloride 14.7g , 41.2 g of anhydrous magnesium sulfate, and 10000 g of water.

[0030] Preparation steps:

[0031] (1) Add 270g of sodium chloride, 14.7g of anhydrous calcium chloride and 41.2g of anhydrous magnesium sulfate to 10,000g of purified water, then stir evenly to obtain brine.

[0032] (2) At normal temperature and pressure, add sodium cocoyl sulfate, lauryl dihydroxyethyl ammonium oxide, ethanol, Tween 20 and 50% of the total saline into the reactor, and stir thoroughly for 1-2 hours until until completely dissolved;

[0033] (3) After stirring evenly, add α-olefin sulfonate into the reaction kettle and stir for 0.5-1h, then add the remaining brine to obtain the finished oil displacement agent.

[0034] At a temperature of 85°C and a salinity of 30,0...

Embodiment 2

[0035] Example 2: Raw materials: α-olefin sulfonate 55g, sodium dodecyl naphthalene sulfonate 20g, cocamidopropyl sulfobetaine 35g, isopropanol 300g, Tween 20 700g, sodium chloride 270g, anhydrous chlorine Calcium 14.7g, anhydrous magnesium sulfate 41.2g, water 10000g.

[0036] Preparation steps:

[0037] (1) Add 270g of sodium chloride, 14.7g of anhydrous calcium chloride and 41.2g of anhydrous magnesium sulfate to 10,000g of purified water, then stir evenly to obtain brine.

[0038] (2) At normal temperature and pressure, add sodium dodecyl naphthalene sulfonate, cocamidopropyl sulfobetaine, isopropanol, Tween 20 and 50% of the total saline into the reactor, and stir thoroughly for 1 -2h, until completely dissolved;

[0039] (3) After stirring evenly, add α-olefin sulfonate into the reaction kettle and stir for 0.5-1h, then add the remaining brine to obtain the finished oil displacement agent.

[0040] At a temperature of 85°C and a salinity of 30,00...

Embodiment 3

[0041] Example 3: Raw materials: α-olefin sulfonate 62g, monoalkyl ether phosphate triethanolamine salt 35g, lauryl amidopropyl amine oxide 50g, isopropanol 300g, Tween 20 850g, sodium chloride 270g, anhydrous calcium chloride 14.7g, 41.2g of anhydrous magnesium sulfate, and 10000g of water.

[0042] Preparation steps:

[0043] (1) Add 270g of sodium chloride, 14.7g of anhydrous calcium chloride and 41.2g of anhydrous magnesium sulfate to 10,000g of purified water, then stir evenly to obtain brine.

[0044] (2) At normal temperature and pressure, add monoalkyl ether phosphate triethanolamine salt, lauramide propylamine oxide, isopropanol, Tween 20 and 50% of the total saline into the reactor, and stir thoroughly for 1-2 hours , until completely dissolved;

[0045] (3) After stirring evenly, add α-olefin sulfonate into the reaction kettle and stir for 0.5-1h, then add the remaining brine to obtain the finished oil displacement agent.

[0046] At a tempe...

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Abstract

The invention relates to a temperature-resistant salt-resistant composite foam oil displacement agent for tertiary oil recovery and a preparation method thereof, belonging to the field of chemical oil displacement for increasing the crude oil recovery ratio of the oil field. The oil displacement agent is compounded by 0.5-1% of alpha-alkene sulfonate as a main surfactant and other auxiliary agents and comprises the following components in percentage by mass:0.1-1.5% of anionic surfactant, 0.2-0.8% of zwitterionic surfactant, 2-10% of organic solvent, 5-12% of stabilizing agent and the balance of a salt solution added to be 100%. Compounds related to the oil displacement agent are industrially produced fine chemical products, the raw materials are easy to obtain, the production cost is low, and the preparation is simple; the oil displacement agent has performances of temperature resistance, salt resistance, ultralow interfacial tension and the like; the persistence of the foam is strong, and the half-life period can be more than 120min at 85 DEG C; the oil displacement age has excellent compatibility with other surfactants, and the comprehensive recovery ratio of the crude oil can be increased by about 10-15%.

Description

Technical field [0001] The present invention involves chemical oil -driven fields that increase the harvesting of oilfield crude oil. Specifically, it is a temperature -resistant salt -resistant composite foam driving agent and its preparation methods applied to three times of oil collection. Background technique [0002] Since the 1980s, major oil fields in my country have begun large -scale oil collection, such as steam throughput, polymer drive, biological drive, etc., the purpose is to drive the remaining 60 %of the remaining crude oil at one time.So far, some oil fields with high oil collection techniques have basically conducted 10-20 rounds of oil under the oil well.With the continuous development of oil mining, my country's main oil fields have entered the stage of high water content in the later stage of secondary oil collection, and underground crude oil is in a discontinuous dispersing state.In order to increase the harvest rate of the oil field and increase the harves...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/584
Inventor 杨勇陈启华梁欣相明辉舒增荣傅家谟
Owner SHANGHAI UNIV
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