Oil-based drilling fluid without surfactant used as emulsifier
A surfactant-free, oil-based drilling fluid technology, applied in the field of oil-based drilling fluids, can solve problems such as poor stability, and achieve the effects of strong stability, alleviation of damage, and favorable wellbore stability.
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Embodiment 1
[0018] As the best implementation mode of the present invention, the proportion of adding nanomaterials is: 1~5%, based on the total weight of oil-based drilling fluid, the rest is oil phase and water phase, organic soil can also be added as needed, oil-based Losing agents, wetting agents, tackifiers, weighting agents, provided that they do not affect the properties described in this patent; the ratio of oil phase to water is 75:25 to 90:10.
[0019] Raw materials, equipment and sources thereof in this embodiment:
[0020] Oleophilic nano silica particles (30-40nm): Boyu Hi-Tech New Material Technology Co., Ltd.
[0021] Lipophilic nano-calcium carbonate particles (40-60nm): Boyu Hi-Tech New Material Technology Co., Ltd.
[0022] Oleophilic nano-titanium dioxide (20-30nm): Boyu Hi-Tech New Material Technology Co., Ltd.
[0023] Calcium chloride aqueous solution with a mass concentration of 20%: Calcium chloride with a mass of 20% (based on the total weight of the water phase...
Embodiment 2
[0030] As another preferred embodiment of the present invention, its components and proportioning ratio are:
[0031] Oleophilic nano-calcium carbonate particles: 1%, calcium chloride aqueous solution: 15%, diesel oil 84%, after high-speed stirring to form oil-based drilling fluid, the measured demulsification voltage is 630V, and the demulsification voltage is 430V after hot rolling at 80°C . All the other are with embodiment 1.
Embodiment 3
[0033] As another preferred embodiment of the present invention, its components and proportioning ratio are:
[0034] Oleophilic nano-silica particles: 1%, calcium chloride aqueous solution: 15%, diesel oil 84%, after high-speed stirring to form oil-based drilling fluid, the measured demulsification voltage is 2063V, and the demulsification voltage after hot rolling at 80°C is 1527V. All the other are with embodiment 1.
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