A method of extracting crude oil

Abstract

The invention discloses a crude oil recovery method. The method comprises placing a mixture in a condition which enables the heavy components of heavy oil to be under catalytic cracking for reaction, wherein reaction products serve as blending diluting oil to be injected into an oil well to recover the crude oil in the oil well, the mixture is composed of the heavy oil, catalysts and water which have a weight ratio of 1: (0.00004-0.01): (0.02-1.5). According to the crude oil recovery method, the viscosity of the heavy oil which is provided with a dynamic viscosity not less than 1000mPa*s after degassing and dewatering at a temperature of 50 DEG C can be reduced without additional hydrogen donors or oxygen donors, the catalytic viscosity reduction effects are good, and the obtained blending diluting oil can be injected into the crude oil to a certain scale to achieve diluted oil recovery. Meanwhile, the method does not require any other additives, achieves the aim of preparing the blending diluting oil in a short time and at a low temperature and a low pressure, solves the problem of thin oil scarcity of certain oil fields and is applicable to the practical application of oil fields.

Description

technical field [0001] The invention relates to a crude oil extraction method, in particular to an underground heavy oil extraction method. Background technique [0002] In the world's oil resources, the geological reserves of heavy oil far exceed the reserves of conventional crude oil. With the increasing demand for oil, the gradual reduction of conventional crude oil resources makes heavy oil have great development value. Heavy oil in the world's oil production production has gradually increased. However, the high content of colloid and asphaltene in heavy oil makes its viscosity and freezing point high, which makes it more difficult to extract and refine heavy oil. [0003] Due to the high viscosity of heavy oil, the fluidity of heavy oil becomes poor during production and gathering and transportation, the flow resistance increases, and the lifting of the wellbore and long-distance transportation of the tubing become very difficult. At present, the main production metho...

AI Technical Summary

Problems solved by technology

When using the above-mentioned catalysts or viscosity reducers to catalytically reduce the viscosity of heavy oil, it is necessary to add hydrogen, methane, etc., or to add hydrogen or oxygen donors, which is difficult to implement and takes a long time to react.