Fire-flooding thermal-ignition method for oil layer

Abstract

A thermal ignition method for fire-flooded oil-flooded oil-flooded oil wells in an oil field, using a movable skid-mounted gas-steam generator set, and using high-temperature, high-pressure combustion technology to burn diesel to produce nitrogen, carbon dioxide, and water Steam mixed gas and a large amount of heat energy; when the combustion temperature in the gas-steam generator reaches 1800°C, the mixed gas is mixed with water to cool down to 300-400°C, the pressure is less than 25MPa, and injected into the oil layer through the wellhead device and injection pipe string of the oil well; Inject 3-10×104Nm3, 300-400°C mixed gas to preheat the oil layer, and then continuously inject air into the well to oxidize crude oil and air in the oil layer, release heat, reach the spontaneous ignition point, and carry out combustion to realize fire oil layer The purpose of oil displacement. The method solves the problems in the prior art that the heating temperature is too high and the heater is easily burnt out; the chemical method has a low ignition success rate. The invention can be widely used for ignition of oil wells in fire flooding and recovery oil layers in oil fields.

Description

Technical field: [0001] The invention relates to a thermal ignition method for fire-flooding oil-producing oil layers used for ignition of oil-field oil-well fire-flooding oil-producing oil layers. Background technique: [0002] At present, fire flooding is one of the displacement methods in oil production in oil fields. It uses crude oil in the oil layer as fuel to burn with the air injected into the oil layer to generate heat, increase the pressure of the formation, and replace the crude oil in the formation to the bottom of the well. In the prior art, the ignition methods of medium fire flooding oil recovery oil layer include electric heater method, combustion aid chemical method and steam injection method. The electric heater method uses a cable to send the heater into the oil well to heat the injected air. This method has the disadvantage that the injected air cannot fully contact the heater, which often results in uneven heat absorption by the air, and sometimes causes...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a thermal ignition method for fire flooding oil recovery oil layer, which solves the problems in the prior art that the heating temperature is too high and the electric heater is easily burned out, and the ignition success rate of the chemical method of the combustion aid is very low.