Method for preparing high-stability heat-resistance and salt-tolerance air foam oil displacing agent

An air foam flooding, temperature-resistant and salt-resistant technology, applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve problems such as easy adsorption and retention, re-deposition, unstable foam application, etc., to improve temperature resistance and salt resistance Effect of stability and stability, high foam strength and temperature resistance, good shear resistance

Inactive Publication Date: 2014-09-24
CHENGDU UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although polymer, surfactant, alkali flooding and ASP flooding have increased the oil production rate to a certain extent, and the recovery rate has been increased by 20% on the basis of water flooding, there is still 40-50% oil remaining In the underground, there is still a limit to the improvement of the recovery of the remaining oil in the middle and later stages of the oilfield, and the technology itself has certain problems: the amount of polymer used is large, and it is easy to adsorb and retain; the surfactant is easy to absorb and lose; Mineral dissolution will re-deposit and scale will affect the displacement effect; problems such as chromatographic separation in compound flooding will reduce oil recovery efficiency and increase additional economic costs for dealing with these problems. Therefore, the improvement of chemical flooding technology is still a ongoing research topics
In addition, as the formation deepens, the pressure increases and the temperature increases. Generally, the temperature rises by 3°C for every 100 meters deeper in the formation, which brings more and more high-temperature, high-salt and harsh formations. The emergence of the foam has greatly limited the application of the already unstable foam. The existing foam research can no longer meet the current needs. Therefore, it is suitable for the high stability, temperature and salt resistance foam system of various harsh formations. Research and development will be the main research direction and key research field in the field of foam flooding in the future, and it has great strategic significance for increasing the output of my country's oilfields

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Add 6 g of hectorite into 300 mL of deionized water at 70°C, stir for 45 minutes, disperse evenly, then cool down to room temperature, and let it stand for 42 hours to obtain a hectorite aqueous dispersion. Add 2.4g of octadecyltriethylammonium bromide to the lithium soap right water dispersion, stir evenly for 18h, let stand and age for 10h, add 1.3g of sodium dodecylbenzenesulfonate, and then Stir at a speed of 8000 rpm for 5 minutes to obtain a highly stable temperature-resistant and salt-resistant air foam oil displacement agent. The apparent viscosity at room temperature is 900 mPa.s, the apparent viscosity at 90°C is 220 mPa.s, the foaming efficiency is 60%, the foam half-life is 420h, and the apparent viscosity of the foam after shearing at a shear rate of 170s-1 for 60 minutes is The half-life of the foam is 40h under the condition of 400 mPa.s and salinity (NaCl) of 30000mg / L.

Embodiment 2

[0045] Add 3 g of laponite into 300 mL of deionized water at 60°C, stir for 50 minutes, disperse evenly, then cool down to room temperature, and leave to age for 38 hours to obtain a hectorite aqueous dispersion. Add 1.2g of cetyltriethylammonium bromide to the lithium soap right water dispersion, stir evenly for 16h, let stand and age for 8h, add 1.2g of sodium lauryl sulfate, and then put it on the high-speed emulsifier at 8000rpm Stirring at a high speed for 5 minutes, a highly stable temperature-resistant and salt-resistant air foam oil displacement agent can be obtained. The apparent viscosity at room temperature is 400 mPa.s, the apparent viscosity at 90°C is 100 mPa.s, the foaming efficiency is 100%, the half-life of the foam is 236 hours, and the apparent viscosity of the foam after shearing at a shear rate of 170s-1 for 60 minutes is 190 mPa.s, the foam half-life is 21h when the salinity (NaCl) is 30000mg / L.

Embodiment 3

[0047] Add 2 g of hectorite into 300 mL of deionized water at 50°C, stir for 60 minutes, disperse evenly, then cool down to room temperature, and let it stand for 36 hours to obtain a hectorite aqueous dispersion. Add 0.8g of cetyltrimethylammonium bromide to the lithium soap dextrohydrin dispersion, stir evenly for 12h, let stand and age for 6h, add 0.6g of sodium lauryl alcohol polyoxyethylene ether sulfate, and then Stir on a high-speed emulsifier at a speed of 5000 rpm for 6 minutes to obtain a highly stable temperature-resistant and salt-resistant air foam oil displacement agent. The apparent viscosity at room temperature is 200 mPa.s, the apparent viscosity at 90°C is 50 mPa.s, the foaming efficiency is 80%, the half-life of the foam is 100 h, and the apparent viscosity of the foam after shearing at a shear rate of 170 s-1 for 60 min is The half-life of the foam is 10h when the salinity (NaCl) is 30000mg / L at 80 mPa.s.

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Abstract

The invention discloses a method for preparing a high-stability heat-resistance and salt-tolerance air foam oil displacing agent. According to the method, a nanometer and nanometer modification technology is adopted, and nanometer hectorite is used as a foam stabilizer and a high-temperature stabilizer to prepare the high-stability heat-resistance and salt-tolerance air foam oil displacing agent. The technology includes the following steps that the hectorite is added into deionized water at the temperature of 50-90 DEG C, stirred and dispersed evenly, cooled to the room temperature and stewed and aged for a period of time to obtain hectorite aqueous dispersion, quantitative cationic surface active agents are added, evenly stirred, stewed and aged, finally, foaming agents are added, high-speed stirring is conducted on a high-speed emulsification machine, and the high-stability heat-resistance and salt-tolerance air foam oil displacing agent is obtained. The foam half-life period reaches up to 768 hours, the high foam stability is achieved, the foam half-life period reaches up to 70 hours under the condition that the degree of mineralization is 30000 mg/L, the good salt tolerance is achieved, the apparent viscosity reaches up to 2000 mPa.s, the heat resistance performance reaches 90 DEG C, the high foam strength and the heat resistance are achieved, the shearing rate is 170 per second, the foam apparent viscosity reaches 800 mPa.s after shearing is conducted for 60 minutes, the good shearing performance is achieved, and the method is suitable for exploration and development of conventional and unconventional oil fields.

Description

technical field [0001] The invention relates to a preparation method of a highly stable temperature-resistant and salt-resistant air foam oil displacement agent. The highly stable temperature-resistant and salt-resistant air foam oil displacement agent prepared by the invention is suitable for the exploration and development of conventional and unconventional oil field resources. Background technique [0002] With the increase of the world's energy demand, the requirements for oil extraction volume and extraction efficiency are getting higher and higher. Conventional oil extraction methods (primary and secondary) can generally only recover 1 / 3 of the crude oil geological reserves, and about 2 / 3% of the crude oil still stays in the oil layer, how to further increase the crude oil recovery rate has been a common concern of the domestic and foreign petroleum circles. [0003] As most of my country's oilfields enter the high water-cut development period, using tertiary oil reco...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/58
CPCC09K8/584
Inventor 万涛徐敏程文忠李蕊香邹矗张
Owner CHENGDU UNIVERSITY OF TECHNOLOGY
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