Re-combustion injector of combustor of re-combustion supercritical pressure gas-liquid phase fuel generator

Abstract

The invention discloses a re-combustion injector of a combustor of a re-combustion supercritical pressure gas-liquid phase fuel generator and relates to oil extraction equipment in the oilfield. A gas-phase cavity (5) and a gas-phase nozzle (6) are arranged in an internal channel of a gas-phase joint (1); a fuel nozzle (11) is arranged in an internal channel of a liquid-phase joint (2); a liquid-collecting cavity (9) and a drain hole (13) are arranged in an internal channel of a water joint (3); two end surfaces of a re-combustion injector shell (4) are spherical end surfaces (15); the gas-phase joint (1), the liquid-phase joint (2) and the water joint (3) are connected with the re-combustion injector shell (4); a throat insert (7) is also connected with the re-combustion injector shell (4); and the re-combustion injector shell (4) is clamped and fixed between a pre-combustion chamber shell and a re-combustion chamber shell. The invention has the advantages of changing the combustion mode of the traditional steam injection generator, dividing a disposable combustion mode integrated on the top of the combustion chamber into a mode with a pre-combustion part and a re-combustion partthrough a re-combustion type combustion method and realizing the combustion of two phases of fuels at the same time.

Description

technical field [0001] The invention relates to oil production equipment in oil fields, in particular to a supplementary combustion injector device for the combustion chamber of a supplementary combustion type supercritical pressure gas-liquid two-phase fuel steam injection generator (also known as a composite heat carrier generator). Background technique [0002] Since the advent of steam injection generator for more than ten years, multi-well pilot tests have been carried out in shallow oil reservoirs and high-permeability medium-deep oil reservoirs in several major oilfields in China, such as Daqing, Shengli, Liaohe, and Xinjiang. The test results show that the oil-increasing mechanism of the equipment is feasible and can be organically combined with a number of existing oil-recovery processes, and certain oil-increasing effects have been achieved. However, with the deepening of reservoir development, several composite heat carrier generators disclosed in my country have ...

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Problems solved by technology

However, according to the field test, although the above scheme solved the burning or damage problem of the top of the combustion chamber in the original design working condition, when the injection pressure of the generator increased, the flow increased and the long-term continuous operation, the cyclone, the top of the combustion chamber and the inner The lining and other components still suffered from severe burning, which caused consequences such as burning eccentricity and lining damage, which affected the normal operation of the equipment

In addition, in the disclosed invention designs, single-phase nozzles are usually used, but due to the different flow characteristics of gas-liquid two-phase fluids, the nozzle design requirements are quite different. Therefore, the previous single-phase nozzles often cannot meet the requirements of two-phase fluids The injection characteristics requirements, that is, the design concept of simultaneous combustion of gas-liquid two-phase fuel cannot be met, especially the original combustion method that the generator is concentrated on the top of the combustion chamber cannot be changed

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