Micro-emulsion viscosity reducer for thick oil, and preparation method thereof

Abstract

The invention provides a micro-emulsion viscosity reducer for thick oil, and a preparation method thereof. The viscosity reducer comprises, by weight, 33-37 parts of an oil-soluble viscosity reducer, 16-20 parts of a nonionic surfactant, 18-22 parts of a sulfonate anionic surfactant, 2-4 parts of a Tween emulsifier, 3-5 parts of isomeric alcohol and 20-24 parts of water. The micro-emulsion viscosity reducer is prepared through a reaction of above raw materials in a reaction kettle at a certain temperature under a certain rotating speed. The micro-emulsion viscosity reducer is processed by oilfield hot sewage to prepare an aqueous solution, and the aqueous solution injected to the underground, so the micro-emulsion viscosity reducer has the characteristics of high viscosity reduction, strong economy and the like, allows the viscosity of the thick oil to be decreased by above 98%, can substitute high-pressure steam exploitation, realizes a very high economic input-output ratio, fully solves the problems of high thick oil viscosity, difficult exploitation and the like in oilfield exploitation and extraction processes, and has a large-scale popularization value.

Description

Technical field [0001] The invention relates to a thick oil viscosity reducer in petroleum exploitation and its preparation, in particular to a heavy oil microemulsion viscosity reducer and a preparation method thereof. Background technique [0002] The content of gums, asphaltenes and paraffin in heavy oil is high, the viscosity is very high, and the fluidity is poor. Therefore, mining and gathering are very difficult. Some physical or chemical methods must be adopted to upgrade or modify the heavy oil to reduce the viscosity. , Improve fluidity, thereby improving mining rate and recovery rate. As a commonly used auxiliary process in the development of heavy oil, heavy oil viscosity reducers are widely used in wellbore lifting, thermal compound chemical huff and puff, and chemically enhanced cold production processes. At present, the commonly used heavy oil viscosity reducers mainly include oil-soluble viscosity reducers , Emulsified viscosity reducer, depolymerization viscosit...

AI Technical Summary

Problems solved by technology

As a commonly used auxiliary process in the development of heavy oil, heavy oil viscosity reducers are widely used in wellbore lifting, thermal compound chemical huff and puff, and chemically enhanced cold recovery processes. Currently, the commonly used heavy oil viscosity reducers mainly include oil-soluble viscosity reducers , emulsifying viscosity reducer, depolymerization viscosity reducer, etc. Among them, the oil-soluble viscosity reducer has strong adaptability to oil products but relatively high cost of use, and the surfactant-based viscosity reducer is efficient and low-cost, but has the problem of poor adaptability to some oil products