Preparation method of low-temperature thickened oil hydrothermal cracking viscosity-reduction catalyst

Abstract

The invention relates to a preparation method of a low-temperature thickened oil hydrothermal cracking viscosity-reduction catalyst. At normal temperature, transition metal salt is dissolved in waterin a reaction container, while stirring, a hydroxamic acid compound is added in the reaction container, and then uniformly stirred, the solution in the reaction container is heat to the temperature of30-100 DEG C, then is stirred for 1-4 hours and cooled to room temperature, and water is steamed; a cocatalyst is added in residue in the reaction container, and the thickened oil hydrothermal cracking catalyst is obtained, the prepared catalyst has good catalysis effect under low temperature, the catalytic reaction at the temperature being more than 180 DEG C can reduce viscosity of the thickened oil can reach more than 70%, the catalyst is not dissolved in crude oil, processing difficulty during a crude oil processing process cannot be increased due to increase of the metal ion content in the crude oil, the catalyst has obvious advantage of protecting quality of the crude oil, operation is simple, thickened oil recovery difficulty is obviously reduced, and the catalyst is benefit for on-site popularization.

Description

technical field [0001] The invention relates to the technical field of heavy oil thermal cracking catalysts, in particular to a preparation method of a low-temperature heavy oil hydrothermal cracking viscosity-reducing catalyst. 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 yea...

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