Viscous oil emulsion phase-inversion profile control water blockoff
A technology of profile control, water plugging, and oil-in-water emulsion, which is applied in wellbore/well components, earthwork drilling, sealing/isolation, etc., and can solve problems such as restrictions on popularization and application and limited use effects
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[0006] The specific composition and implementation process of the present invention will be described in detail below in conjunction with the embodiments.
[0007] This embodiment is applicable to the working condition where the formation temperature is 65°C to 70°C, and the composition of the emulsifier used is: OP-21: 30%, Tween-60: 20%, Span-80: 10%, sodium carbonate: 20%, Sodium carboxylate: 20%.
[0008] The phase inversion agent is: OP-4: 10%, solid powder bentonite: 90%.
[0009] Mix 70% of heavy oil at a temperature of 100°C to 110°C with 30% of water at a temperature of 80°C to 90°C, add a prepared emulsifier for emulsification, and the amount of emulsifier is 0.5% to 1% (in the entire emulsification content in the oil system) to obtain an oil-in-water emulsion.
[0010] In the above-mentioned oil-in-water emulsion that has been produced, add a phase inversion agent with a content of 3% to 10% and mix evenly, inject it into the ground with a pump, and after entering...
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