Water-phase tackifying heavy oil emulsifier and application thereof in reducing viscosity of heavy oil

Abstract

The invention belongs to the field of development of oil field chemicals, and relates to a water-phase tackifying heavy oil emulsifier. The emulsifier comprises an amine oxide type ampholytic surfactant, a betaine type ampholytic surfactant and water. Compared with the existing common heavy oil reservoir emulsification viscosity reducer, the invention has the following beneficial effects: 1, compared with the existing common heavy oil reservoir emulsification viscosity reducer, the components in the water-phase tackifying heavy oil emulsifier disclosed by the invention are economical in price and easy to obtain, and the preparation cost is lower; 2, through the synergistic interaction between the two ampholytic surfactants, the viscosity reduction of heavy oil and the viscosity increase of a water phase can be realized at the same time in the exploitation process, and the oil-water mobility ratio can be effectively improved; 3, emulsification can be realized under the action of micro power.

Description

technical field [0001] The invention belongs to the development field of oilfield chemicals, and in particular relates to an aqueous phase thickening type heavy oil emulsifier and its application for reducing the viscosity of heavy oil. Background technique [0002] Among PetroChina's proven reserves, ordinary heavy oil reservoirs are widely distributed and rich in reserves, accounting for 74.7%. Ordinary heavy oil reservoirs generally have the characteristics of high underground crude oil viscosity, relatively large water-oil mobility, small water flooding sweep coefficient, fast water cut rise rate, and low recovery degree of the reservoir. In order to achieve the goal of enhanced oil recovery, reducing the viscosity of heavy oil by using emulsifiers, changing the viscosity of oil-water two-phase, and then improving the water-oil mobility ratio are important production stimulation measures for this type of reservoir. [0003] CN102618245A reports a heavy oil emulsificatio...

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Problems solved by technology

[0003]CN102618245A reports a thick oil emulsification viscosity reducer and its application, the viscosity reducer can realize the emulsification reduction of ordinary heavy oil under the condition of salinity 20000mg / L Viscosity, the water phase viscosity of the viscosity reducer is low, the stirring speed of the emulsified heavy oil is faster, and the time is longer

It can be used for emulsification and viscosity reduction of heavy oil with high salinity and in the environment of 40-50°C. The raw materials of the viscosity reducer are expensive, the synthesis and preparation conditions are complicated, the stirring speed of emulsified heavy oil is fast, the time is long, and the economic applicability needs to be improved.

[0005]The current heavy oil emulsifier, at 60℃, the total salinity of formation water is 13000 mg / L (Ca2+, Mg 2+ is 1100 mg / L), the viscosity of the water phase is low; if only under the stirring action of the internal dynamics of the formation, the emulsification effect on heavy oil is very small

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