Improved method for recovery and modification of oil sand

Abstract

The invention relates to a method for recovering oil component (asphalt) from oil sand and a method for recovering asphalt of improved quality, particularly to a method for recovering asphalt of improved quality from oil sand by application of SAGD technology. The method comprises the following steps: 1) (a) steam and gas generation matter, or (b) steam, CO2 gas and gas generation matter are injected simultaneously; 2) the temperature and pressure of the steam are transmitted to the oil component contained in the oil sand through the CO2 gas and the gas generation matter; 3) the gas generation matter decomposes under high-temperature and high-pressure conditions and gas is generated; 4) the gas generated in the CO2 gas and the gas generation matter interacts with the asphalt, and thus the viscosity of the asphalt is reduced; and 5) the gas generated in the CO2 gas and the gas generation matter under high-temperature and high-pressure conditions reacts with the asphalt. Thus, compared with the method in which only steam is injected when asphalt is recovered from the oil sand, the method by which the quality of the asphalt can be substantially improved is provided.

Description

technical field [0001] The present invention relates to a method for simultaneously recovering and modifying oil components (bitumen) from oil sands, and more specifically, to recovering oil sands from underground storage using SAGD (steam assisted gravity drainage) technology. Simultaneous injection of steam and gas generating substances, steam and CO 2 , steam and CO 2 and gas-generating substances to recover bitumen of improved quality while recovering the oil component (bitumen) from underground stored oil sands. Background technique [0002] Oil sands are composed of asphalt (bitumen) corresponding to oil components, quartz sand (quartz sand), clay (clay), water, and trace amounts of various minerals mixed together physically and chemically. Different components will be different, probably composed of 75-85% inorganic matter (quartz sand, clay, minerals, etc.), 3-5% water, and 1-18% asphalt. [0003] The bitumen contained in the above-mentioned oil sands is black cru...

AI Technical Summary

Problems solved by technology

However, the recovery rate at the production site is about 50%, and excessive steam is used, and excessive fuel is used to generate steam, thereby generating excessive CO 2 The problem

[0008] The above-mentioned ES-SAGD technology uses SAGD technology, injecting steam and organic solvent within 10% by weight at the same time, thereby showing improved performance compared with SAGD, and has the advantage of recovery rate of about 60%, but the problem is that it cannot be 100% Recovery of injected organic solvents

The API value of heavy oil is usually less than 10, and its fluidity is poor. Therefore, it is difficult to recover and transport. When using SAGD technology to recover bitumen stored underground, the SOR value (volume) is more than 2, and more than twice the steam consumption is required. There are problems at this time: in order to generate steam, relatively expensive natural gas is used as a combustion raw material. In addition, in order to transfer the bitumen that has been recovered to the ground and make it fluid, it needs to be mixed with a suitable solvent or heated to a relatively high temperature. Storage at high temperature

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