Preparation and Application of Clean Heavy Oil Degradation Catalytic System

Abstract

The preparation and application of the clean heavy oil degradation catalytic system is prepared as follows: under stirring, add substituted phenolic compounds, formaldehyde-containing compounds or solutions, iminodiacetate and water into the hydrothermal reaction kettle, and then react to the hydrothermal reaction Add a transition metal salt aqueous solution dropwise into the kettle, the transition metal salt is chemically pure or above, tighten the hydrothermal reaction kettle and place it in a constant temperature box, and cool to room temperature after the reaction; add methanol and urea to the above solution to obtain a thick Oil-water thermal cracking catalytic system; when applied, use a high-pressure pump to pre-dilute this type of catalytic system with reinjection water, pre-inject into the oil reservoir, and then inject steam, which can reduce the freezing point of heavy oil by more than 10°C and reduce the viscosity by more than 70%. The process is simple, which significantly reduces the difficulty of heavy oil production and is conducive to field promotion; this type of catalytic system is insoluble in crude oil, will not increase the content of metal ions in crude oil and increase the difficulty of crude oil processing, and can significantly protect the quality of crude oil.

Description

technical field [0001] The invention relates to the technical field of a catalytic system for catalyzing heavy oil degradation, in particular to the preparation and application of a clean heavy oil degradation catalytic system. Background technique [0002] my country is rich in heavy oil resources and widely distributed. More than 70 heavy oil fields have been discovered in 12 basins, and the estimated resources can reach 300×10 8 t above, accounting for about 15% of my country's total oil reserves. However, heavy oil has high viscosity and poor fluidity, and its exploitation is more difficult, costly and technically demanding. Commonly used methods for mining heavy oil include blending thin oil, hot water flooding, steam huff and puff and steam flooding, emulsification and viscosity reduction, heavy oil modification and viscosity reduction, etc. Among them, in-situ catalytic cracking / degradation modification of heavy oil has become a popular topic in China in recent year...

AI Technical Summary

Problems solved by technology

At present, this technology has gradually begun to be applied, and my country has also carried out large-scale tests in Liaohe Oilfield, Nanyang Oilfield and other places, but the core catalytic system in this technology is oil-soluble transition metal salts (such as nickel oleate, naphthenic acid, etc. Nickel, etc.), must first be injected into the formation through an oil-based slug, and then steam injected to heat and crack the heavy oil. The construction process is more complicated, and generally it needs to be around 250-300°C to effectively catalyze the heavy oil cracking

In addition, the addition of oil-soluble metal salts, especially nickel salts, will seriously damage the quality of crude oil and increase the burden on subsequent crude oil processing