Ultrahigh-characteristic-value three-phase flue gas foam for oil-gas field and preparation method thereof
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A flue gas, characteristic value technology, applied in chemical instruments and methods, drilling compositions, etc., can solve the problems of high cost of foam use and high cost of nano-particle application, achieve low cost, reduce industrial pollution sources, stability Enhanced effect
Active Publication Date: 2019-03-26
CHINA UNIV OF PETROLEUM (BEIJING)
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However, the current application cost of nanoparticles as a foam enhancer is still high, especially the application cost of nanoparticles that has been further increased by the hydrophilic and hydrophobic modification of the surface of nanoparticles.
In addition, when the added concentration of enhancer in the foaming liquid remains constant, the lower the foam characteristic value, the higher the liquid phase content in the foam, the greater the total amount of enhancer used, and the higher the use cost of the foam
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Embodiment 1
[0043] Example 1. Ultra-high eigenvalue three-phase flue gas foam for oil and gas fields
[0044] The raw materials are gas phase, liquid phase and solid phase, and the specific components are as follows:
[0045] The gas phase is the flue gas produced by the coal-fired power plant, which has undergone desulfurization, denitrification and deoxidation processes. The total fraction of nitrogen and carbon dioxide in the flue gas is ≈93%.
[0046] The maximum particle size of fly ash in the solid phase is 46 μm, the average particle size is 1.3 μm, SiO 2 Accounting for 63wt%, Al 6 Si 2 o 13 Accounting for 26wt%, Fe 2 o 3 The proportion is 6wt%, and the wetting angle of fly ash particles to distilled water is 57°; the average particle size of nano-silica in the solid phase is about 15nm, and the specific surface area is 160m 2 / g, the wetting angle of nano-silica particles to distilled water is 63°, and the mass ratio of fly ash to nano-silica particles is 8.5:1.
[0047] Th...
Embodiment 2
[0054] Example 2: Ultra-high eigenvalue three-phase flue gas foam for oil and gas fields
[0055] The raw materials are gas phase, liquid phase and solid phase, and the specific components are as follows:
[0056] The gas phase is the flue gas produced by the coal-fired power plant, which has undergone desulfurization, denitrification and deoxidation processes. The total fraction of nitrogen and carbon dioxide in the flue gas is ≈93%.
[0057] The maximum particle size of fly ash in the solid phase is 13 μm, the average particle size is 0.5 μm, SiO 2 Accounting for 71wt%, Al 6 Si 2 o 13 Accounting for 18wt%, Fe 2 o 3 The proportion is 3%, and the wetting angle of fly ash particles to distilled water is 54°; the average particle size of nano-silica in the solid phase is about 15nm, and the specific surface area is 160m 2 / g, the wetting angle of nano-silica particles to distilled water is 63°. - The mass ratio of fly ash to nano-silica particles is 8.5:1.
[0058] The m...
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Abstract
The invention discloses ultrahigh-characteristic-value three-phase flue gas foam for an oil-gas field and a preparation method thereof. The three-phase flue gas foam is composed of a gas phase, a liquid phase and a solid phase, wherein the gas phase is flue gas produced by a coal-fired power plant; the liquid phase is a water solution of a surfactant, a pH (Potential of Hydrogen) value regulator and inorganic salt; the solid phase is a compound of fly ash and nano silicon dioxide; and the characteristic value of the foam is 90 to 99 percent. According to the ultrahigh-characteristic-value three-phase flue gas foam disclosed by the invention, a used solid-phase foam stabilizer is a compound system of fly ash particles and nano silicon dioxide particles; the cost is relatively low and a stable solid-phase particle adsorption layer can be formed on a foam liquid membrane; and unstable characteristics including liquid membrane cracking of the foam, gas dispersion, foam coalescence and thelike are greatly weakened and the stability of the foam is effectively improved. The ultrahigh-characteristic-value three-phase flue gas foam system disclosed by the invention can be adaptive to hightemperature of 230 DEG C and the stability is enhanced along the rising of pressure; and the ultrahigh-characteristic-value three-phase flue gas foam has good temperature resistance and pressure resistance and can be applicable to development operation of high-temperature and high-pressure oil and gas reservoirs.
Description
technical field [0001] The invention relates to an ultra-high eigenvalue three-phase flue gas foam for oil and gas fields and a preparation method thereof, belonging to the technical field of oil and gas field development engineering. Background technique [0002] Foam is a kind of working fluid widely used in oil and gas field development industry at home and abroad. Because of its unique gas-liquid mixing structure, complex liquid film shape, and variable physical properties, it plays an irreplaceable role in petroleum engineering. It was rated as an efficient and intelligent fluid. At present, foam has been applied in almost the whole process of oil and gas development. In drilling and completion engineering, foam drilling fluid, foam completion fluid and foam fracturing fluid have been successfully applied; in oil production engineering, various types of nitrogen and carbon dioxide foam It is used in profile control, water plugging, oil displacement, acidizing and other...
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