Profile control method for gas channeling passage of fireflooding gas-injection well and pipe column for profile control method

Abstract

The invention provides a profile control method for a gas channeling passage of a fireflooding gas-injection well and a pipe column for the profile control method. The profile control method includes the following steps that air is injected into the gas-injection well within a preset time, so that the gas-injection well is communicated with a producing well used for oil extraction; oily sludge is injected into the gas-injection well, and profile control is carried out over an oil layer with large gas suction amount, so that clay in the oily sludge plugs a gas channeling hole way in the gas-injection well, and oil in the oily sludge assists in burning of the oil layer; and finally, the gas-injection well is subject to gas injection and ignition, so that the clay in the oily sludge is sintered while the gas-injection well conducts fireflooding on the oil layer, then an artificial borehole wall attached to the outside of the gas-injection well is formed, oil in the oily sludge burns to generate gas, and a gas runner is formed in the artificial borehole wall while the artificial borehole wall is formed. By means of the profile control method for the gas channeling passage of the fireflooding gas-injection well and the pipe column for the profile control method, the gas channeling passage of a high-pervious bed of the fireflooding gas-injection well can be plugged; and meanwhile, in the process that the oil layer is subject to fireflooding, the well wall of the gas-injection well is strengthened, and hole-wall collapsing is prevented.

Description

technical field [0001] The invention relates to the technical field of petroleum exploitation, in particular to a method for profile control of a gas channeling channel of a fire flooding gas injection well and a pipe string thereof. Background technique [0002] Generally, steam thermal recovery has been carried out before the oil recovery in the fire flooding oil layer. Due to the difference between formations, the high-temperature steam injected by steam thermal recovery is only absorbed by the oil layer with high permeability, and the amount of steam entering the oil layer with relatively low permeability is small. Such underground high-viscosity heavy oil is not fully heated and cannot be fully exploited. After switching to the development method of fire flooding oil layers, if the general gas injection is still used, the layers with high permeability tend to absorb more gas, while the layers with low permeability tend to absorb less gas, resulting in uneven gas inhala...

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Problems solved by technology

[0004] However, the invention patent uses high-temperature foam profile control gas injection well, although it can play a role in adjusting the gas suction profile between oil layers, but the well wall of the injection well is not firm and easy to collapse during the long-term gas injection process, and there is no effective solution for this at present. solution

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