Ignition method of burning oil layer

Abstract

The invention provides an ignition method for combustion of oil in-situ. The method comprises the following steps that an ignition target oil layer is determined; air is injected into the ignition target oil layer through an injection well within a preset time to enable sufficient oxygen to exist in the ignition target oil layer for supporting combustion; a hydraulic ejector is utilized for conducting ejecting on a casing pipe, below the ignition target oil layer, of the injection well to enable a through hole to be formed in the casing pipe; after the through hole is formed in the casing pipe, the hydraulic ejector penetrates through the through hole in the casing pipe to drill the lower portion of the ignition target oil layer; after drilling of the lower portion of the ignition target oil layer is completed, ignition is conducted on the lower portion of the ignition target oil layer, hot tail gas generated after ignition is conducted gradually upwards spread to the whole ignition target oil layer, and therefore the ignition target oil layer is subjected to combustion. By means of the ignition method for combustion of oil in-situ, ignition can be successfully conducted in a non-homogeneous oil layer, thickened oil fireflooding is conducted, and compared with a traditional ignition method, the non-homogeneous oil layer can be ignited more easily.

Description

technical field [0001] The invention relates to the technical field of petroleum exploitation, in particular to an ignition method for burning an oil layer. Background technique [0002] In burning oil formations, the method of ignition can often affect whether the burning oil formation is successful. At present, there are mainly two kinds of ignition methods for burning oil layer. The first chemical ignition method can firstly preheat the oil layer with high-temperature steam, and then use chemical reagents to rapidly raise the oil layer to the spontaneous ignition point of crude oil, and finally make the oil layer burn. The second steam injection spontaneous ignition method is to preheat the oil layer with steam, then continuously inject air, use the air to oxidize the crude oil to release heat, gradually increase the temperature of the oil layer, and ignite the oil layer. These two ignition methods have been successfully applied in the field of oil exploitation. [000...

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Problems solved by technology

[0003] However, it is well known that the plane of the oil layer is not completely a uniform medium layer. If ignition is carried out at the thin oil-containing place in the oil layer, there will be obstacles such as rocks in the thin oil-containing place in the oil layer, which will lead to unsuccessful ignition of the oil layer or failure of ignition after ignition. The fire line cannot move forward well, which leads to a low recovery rate of crude oil and seriously affects production

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