A method of using nano-combustion-supporting agent to ignite oil-burning reservoirs

Abstract

The invention provides a method for in-situ combustion recovery through nano combustion improver ignition. The method comprises the following steps that a heavy oil reservoir is selected; steam slugs are injected into oil layers of gas-injection wells of a well network of the heavy oil reservoir, and the stratum where the oil layers are located is kept above 100 DEG C in temperature and above 2 MPa in pressure; then nano combustion improver solutions are injected into the oil layers of the gas-injection wells of the well network of the heavy oil reservoir, and standing is conducted; normal temperature air is continuously injected into the oil layers of the gas-injection wells of the well network of the heavy oil reservoir to achieve spontaneous ignition; and a production well is opened, and in-situ combustion recovery is conducted according to a regular method. The method for in-situ combustion recovery through nano combustion improver ignition can be applicable to oil layer ignition under the condition that the stratum is small than 5 MPa in pressure or smaller than 250 DEG C in temperature, heat efficiency of a fireflooding test is greatly improved, viscosity of crude oil is lowered, flowability of the crude oil is improved, and the method has good economic benefits.

Description

technical field [0001] The invention belongs to the technical field of oil recovery in heavy oil oilfields, and relates to a method for igniting an oil layer by using a nano-combustion enhancer. Background technique [0002] At present, there are mainly two methods of ignition of oil formations by fire, including electric ignition and chemical ignition. Chemical ignition mainly involves injecting steam and chemical catalysts. Conventional electric ignition temperature needs to be kept above 550°C to ensure the oxygen in the hot air and formation crude oil. Oxidation ignites the oil layer; due to the influence of uneven distribution of chemical catalysts, catalytic contact area, and catalytic efficiency, conventional chemical ignition can only be applied to oil layers in formations with a pressure > 5 MPa and a temperature greater than 250°C. The oil layer (the oil layer in the formation <300m) has low pressure, or the ultra-deep oil layer (the oil layer in the formatio...

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Problems solved by technology

[0002] At present, there are mainly two methods of ignition of oil formations by fire, including electric ignition and chemical ignition. Chemical ignition mainly involves injecting steam and chemical catalysts. Conventional electric ignition temperature needs to be kept above 550°C to ensure the oxygen in the hot air and formation crude oil. Oxidation ignites the oil layer; due to the influence of uneven distribution of chemical catalysts, catalytic contact area, and catalytic efficiency, conventional chemical ignition can only be applied to oil layers in formations with a pressure > 5 MPa and a temperature greater than 250°C. The oil layer (the oil layer in the formation 1000m) has a large heat loss and low temperature due to the injected steam, so chemical ignition cannot be successfully implemented.