Surfactant composition for oil recovery and preparation method of surfactant composition
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A surfactant and composition technology, applied in the field of oil recovery surfactant composition and its preparation, can solve problems such as loss and poor salt resistance, increase dispersibility, change wettability, and reduce oil-water interfacial tension Effect
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Problems solved by technology
Petroleum sulfonate has low cost, high interface activity, good temperature resistance, but poor salt resistance, high critical micelle concentration (cmc), adsorption, stagnation and interaction with multivalent ions in the formation, resulting in losses during oil displacement
Method used
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Examples
Experimental program
Comparison scheme
Effect test
Embodiment 1
[0023] Select raw materials by weight percentage
[0024] Non-ionic surfactant: 40%
[0025] Humectants: 22%
[0026] PH adjuster: 20%
[0027] Tween surfactant: 5%
[0028] Deionized water: 13%.
[0029] Deionized water, Pluronic PE 6200, sodium dodecylbenzenesulfonate, sodium bicarbonate, Tween-80 are added to the stirring reactor successively according to the mass ratio, and stirred for 1.5h to obtain a milky white product, the pH is 8, and the surface tension ( 25°C) is 32mN / m, and the interfacial tension is 4×10 -3 mN / m.
Embodiment 2
[0031] Select raw materials by weight percentage
[0032] Non-ionic surfactant: 45%
[0033] Humectant: 20%
[0034] PH adjuster: 18%
[0035] Tween surfactant: 6%
[0036] Deionized water: 11%.
[0037] Add deionized water, polyoxyethylene polyoxypropylene ether, sodium isopropyl naphthalene sulfonate, sodium bicarbonate, and Tween-60 into the stirring reactor in sequence according to the mass ratio, and stir for 1.5 hours to obtain a milky white product with a pH of 8. The surface tension (25°C) is 36mN / m, and the interfacial tension is 8×10 -3 mN / m.
Embodiment 3
[0039] Select raw materials by weight percentage
[0040] Non-ionic surfactant: 30%
[0041] Humectant: 30%
[0042] PH adjuster: 20%
[0043] Tween surfactant: 6%
[0044] Deionized water: 14%.
[0045] Add deionized water, lauryl polyoxyethylene ether, water-soluble azone, disodium hydrogen phosphate, and Tween-20 into the stirring reactor in sequence according to the mass ratio, and stir for 1.5 hours to obtain a light yellow product with a pH of 8 and a surface The tension (25°C) is 32mN / m, and the interfacial tension is 4×10 -3 mN / m.
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Abstract
The invention relates to a surfactant composition for oil recovery and a preparation method of the surfactant composition. The surfactant composition is characterized by comprising the following components in percentage by weight: 30%-50% of a nonionic surfactant, 20%-30% of a wetting agent, 15%-25% of a pH value regulator, 3%-6% of a Tween type surfactant and 10%-15% of deionized water. The preparation process is as follows: sequentially adding the deionized water, the nonionic surfactant, the wetting agent, the pH value regulator and the Tween type surfactant into a stirring reactor, and stirring to obtain a liquid product. The surfactant composition for oil recovery, provided by the invention, can effectively reduce tension of an oil-water interface, change the wetting property of rock, enable crude oil adsorbed on the rock to fall off, simultaneously increase the dispersibility of the crude oil in the water, form an oil-in-water type emulsion, greatly change the rheological property and salt tolerance of the crude oil and realize the effect of improving the recovery rate.
Description
technical field [0001] The invention belongs to the field of fine chemicals, and in particular relates to a surfactant composition for oil recovery and a preparation method thereof. Background technique [0002] With the increase of the world's energy demand, the rational development and utilization of oil has attracted great attention, and the requirements for the amount and efficiency of oil extraction are also getting higher and higher. Realizing the efficient exploitation of oil and gas resources not only has practical significance for increasing crude oil production, but also has important strategic significance. Conventional oil recovery methods (primary and secondary methods) generally only produce 1 / 3 of the crude oil geological reserves, and about 2 / 3 of the crude oil has not been recovered. Therefore, in the case of increasingly tight energy sources, enhanced oil recovery has become a A major topic of oil exploration research. Tertiary oil recovery technology is ...
Claims
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