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A salt synergistic anti-temperature and anti-salt foam system

A foam system and foaming agent technology, applied in the field of oil displacement agents, can solve the problems of incompatibility and achieve the effects of easy availability of raw materials, good synergistic effect, and good environmental compatibility

Inactive Publication Date: 2017-01-18
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] It can be seen that the existing foam system has a certain ability to resist temperature and salt, but the salinity is as high as 10-20×10 4 mg / L high-temperature and ultra-high-salt reservoirs, but it shows obvious incompatibility

Method used

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  • A salt synergistic anti-temperature and anti-salt foam system
  • A salt synergistic anti-temperature and anti-salt foam system
  • A salt synergistic anti-temperature and anti-salt foam system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] (1) System preparation: Take 0.18g of decyl glucoside, 0.03g of disodium fatty alcohol polyoxyethylene ether sulfosuccinate monoester, and add 100ml of formation water during low-speed stirring (the concentration of calcium and magnesium ions accounts for the total salinity 5%) until fully dissolved; then stir at a low speed while adding 0.15g xanthan gum, and after it dissolves completely, a foam system is obtained.

[0021] (2) Foam property test: Preheat 100ml of the foam system to 90°C, pour it into a warningblender mixer, stir at a shear rate of 4000 rpm for 1 min, measure the foam volume, and then measure the half-life of the foam at 90°C. The results are shown in Table 1.

[0022] The foam property of table 1 embodiment 1

[0023]

Embodiment 2

[0025] (1) System preparation: Take 0.2g of alcohol ether glycoside, 0.07g of decyl maltoside, and 0.03g of fatty alcohol polyoxyethylene ether sulfonate, and add 100ml of formation water during low-speed stirring (the concentration of calcium and magnesium ions accounts for the total mineralization 5% of degree), until fully dissolved; then stir at a low speed, add 0.15g xanthan gum, after it dissolves completely, a foam system is obtained.

[0026] (2) Foam property test: Preheat 100ml of the foam system to 90°C, pour it into a warningblender mixer, stir at a shear rate of 4000 rpm for 1 min, measure the foam volume, and then measure the half-life of the foam at 90°C. The results are shown in Table 2.

[0027] The foam property of table 2 embodiment 2

[0028]

Embodiment 3

[0030] (1) System preparation: Take 0.15g of alcohol ether glycoside, 0.3g of decyl glucoside, and 0.05g of disodium fatty alcohol sulfosuccinate, and add 100ml of formation water during low-speed stirring (the concentration of calcium and magnesium ions accounts for the total mineralization 5% of the degree), until completely dissolved; then stir at a low speed, add 0.1g hydroxyethyl cellulose, 0.6g xanthan gum, and obtain a foam system after it is completely dissolved.

[0031] (2) Foam property test: Preheat 100ml of the foam system to 90°C, pour it into a warningblender mixer, stir at a shear rate of 4000 rpm for 1 min, measure the foam volume, and then measure the half-life of the foam at 90°C. The results are shown in Table 3.

[0032] The foam property of table 3 embodiment 3

[0033]

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PUM

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Abstract

The invention discloses a salt synergistic anti-temperature and anti-salt foam system. The system comprises the following components in percentage by weight: 0.05-0.5% of foaming agent, 0.05-0.2% of foam stabilizer and the balance of formation water or simulated formation water. The foaming agent is formed by compounding a nonionic surfactant and an anionic surfactant according to the mass ratio of (6: 1)-(9:1). The foam stabilizer is one or more of xanthan gum, hydroxyethyl cellulose and polyvinyl alcohol. The salt synergistic anti-temperature and anti-salt foam system disclosed by the invention has strong anti-temperature, anti-salt and anti-calcium and magnesium capabilities and can realize good foaming under the conditions that the temperature is 90 DEG C, the degree of mineralization is 20*10<4>mg / L and the concentration of calcium and magnesium ions is 1*10<4>mg / L, the foam stability is increased along with the increases in the degree of mineralization, the nonionic surfactant and the anionic surfactant have a good synergistic effect, and the salt synergistic anti-temperature and anti-salt foam system can be directly used for ultra-high temperature and ultra-high salt oil deposits with not high foam strength requirements, is easy to obtain raw materials and has good environmental compatibility.

Description

technical field [0001] The invention relates to a salt synergistic, temperature-resistant and salt-resistant foam system, which is an oil displacement agent suitable for high-salt and ultra-high-salt homogeneous / heterogeneous oil reservoirs. Background technique [0002] Foam flooding is a type of enhanced oil recovery technology developed on the basis of gas flooding. It has higher viscosity and lower fluidity than gas, which can significantly improve the mobility ratio, improve the sweep efficiency of the displacement phase, and reduce the The probability of gas channeling occurring. At the same time, the foaming agent that generates foam can improve the oil washing efficiency of the displacement phase by reducing the oil-water interfacial tension, emulsifying crude oil, and improving the wettability of the reservoir. The comprehensive oil displacement mechanism of foam flooding has won the general attention of the petroleum industry, and it is expected to exert its oil d...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/584
CPCC09K8/584
Inventor 孙琳蒲万芬刘学利谭涛魏鹏吴轶君李一波
Owner SOUTHWEST PETROLEUM UNIV
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