Heavy oil reservoir cold production huff-puff self-emulsifying corrosion inhibition viscosity reducer and preparation method and application thereof

Abstract

The invention provides a heavy oil reservoir cold production huff-puff self-emulsifying corrosion inhibition viscosity reducer as well as a preparation method and application thereof, belongs to the technical field of oilfield chemistry, and can solve the technical problems that an existing heavy oil viscosity reducer does not have continuous and effective viscosity reduction capacity, corrosion resistance, or the like. The mass concentration of fatty acid polyoxyethylene ether in the viscosity reducer is 15-70%, the mass concentration of fatty alcohol-polyoxyethylene ether sodium sulfate is 5-20%, the mass concentration of a mixed system composed of organic oxomolybdate, sodium gluconate and sodium polyacrylate is 5-10%, and the balance is water. The method can be applied to exploitationof thick oil at 40-90 DEG C, the viscosity of reservoir crude oil can be effectively reduced, and the stratum crude oil recovery rate is increased.

Description

technical field [0001] The invention belongs to the technical field of oilfield chemistry, and in particular relates to a huff and puff self-emulsifying corrosion inhibitor and viscosity reducer for cold recovery of heavy oil reservoirs and its preparation method and application. Background technique [0002] With the continuous reduction of conventional crude oil reserves, in order to maintain the continuous increase of oil production, the development of heavy oil resources must be strengthened. Heavy oil is rich in asphaltenes and colloids, has a very high density, high viscosity, and poor fluidity, which brings great difficulties to mining and transportation. Effectively reducing the viscosity of heavy oil and improving the fluidity of heavy oil is the key to solving heavy oil production, transportation and refining. [0003] The thermal recovery method of injecting steam into the oil well, light oil dilution method, chemical viscosity reduction, microbial oil recovery a...

AI Technical Summary

Problems solved by technology

However, some problems have been exposed in actual production, such as the use of thermal recovery process, which has low cycle yield, high comprehensive water cut, and mutual interference of oil wells, which ultimately leads to low oil-gas ratio in thermal recovery and low economic benefits

[0004] CN108559470A discloses a self-emulsifying heavy oil viscosity reducer and its preparation method and application. The main agent of the viscosity reducer is modified silicon dioxide, but the production operation of the silicon dioxide modification process is complicated and the energy consumption is high; Phenyl ether sulfosuccinate sodium salt, acrylamide, and tert-butyl peroxybenzoate are easy to hydrolyze, and are prone to failure in the formation, and it is difficult to form a sustained and effective viscosity-reducing ability; and the components do not have corrosion resistance

So far, the corrosion-resistant and environment-friendly heavy oil viscosity reducer with simpler process, lower energy consumption, better viscosity reduction effect and better stability has not been publicly reported or disclosed. A green and environmentally friendly new self-emulsifying viscosity reducer with throughput and corrosion inhibition effect is imminent