Supercritical hydrothermal combustion type steam generator for thermal recovery of heavy oil in ultra-deep well

Abstract

The invention discloses a supercritical hydrothermal combustion type steam generator for thermal recovery of heavy oil in an ultra-deep well. The supercritical hydrothermal combustion type steam generator comprises three parts, namely a generator head, a generator upper part and a generator lower part, an electric heating rod for ensuring the occurrence of the supercritical hydrothermal combustionreaction is arranged on the generator head, the generator upper part comprises a primary combustion chamber and a secondary combustion chamber to ensure sufficient supercritical hydrothermal combustion reaction of fuel and an oxidant, a spray head and reducing ports of the generator lower part ensure that the parameters of reaction products meet the requirements of oil field thick oil recovery, and cooling water in the generator is used for ensuring that the generator is not overtemperature so as to protect safe operation of the generator. According to the supercritical hydrothermal combustion type steam generator, the heavy oil recovery cost is lowered, the heat utilization efficiency is improved, pollutants are prevented from being discharged, and efficient recovery of deep and offshoreoil reservoirs is realized.

Description

technical field [0001] The invention belongs to the technical field of heavy oil exploitation and supercritical water, and relates to a steam generator, in particular to a supercritical hydrothermal combustion steam generator used for thermal recovery of heavy oil in an ultra-deep well. Background technique [0002] Supercritical Water (SCW for short) refers to water in a special state whose temperature and pressure are both higher than its critical point (T=374.15°C, P=22.12MPa). In this state, only a small amount of hydrogen bonds exist in water, the dielectric constant is close to that of organic solvents, and it has low viscosity and high diffusion coefficient. Make organic matter and oxygen miscible with supercritical water in any proportion, so that the heterogeneous reaction becomes a homogeneous reaction, and the mass transfer and heat transfer resistance between substances are greatly reduced. [0003] Supercritical Hydrothermal Combustion (SCHC) technology refers ...

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Problems solved by technology

[0005] In order to overcome the shortcomings of the above-mentioned prior art, and solve the problems of the existing gas injection boiler steam production technology for mining heavy oil, such as huge heat loss, environmental pollution, mining cost higher than the limited mining depth, etc., the purpose of the present invention is to provide a The supercritical hydrothermal combustion steam generator for thermal recovery of heavy oil in ultra-deep wells can be ignited and burned directly in the well to generate steam and carbon dioxide, reducing the high cost of heat loss caused by conventional steam transportation on the ground, and the reactor is relatively injected The small size of the gas boiler can reduce a lot of material costs and land costs, and can automatically adjust the pressure to the pressure required for the thermal recovery of heavy oil in the well. Exploitation of ultra-deep oil reservoir resources

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