In situ combustion slug and steam driving combined type crude oil producing method

Abstract

The present invention discloses a method of oil pumping which adopts the combination of fire oil layer slug and steam drive before steam soaking and is applicable for the pumping of thick oil reservoir. After the steam soaking of the thick oil reservoir and before the pumping of the steam drive, the fire oil layer slug type pumping is performed; an ignition technology is adopted to ignite the oil layer to burn; an air compressor is used to inject air into the oil layer continuously from a center injection well; after 0.3 to 0.8 years of pumping, steam is injected into the oil layer through an injection well, and the steam drive type pumping is performed. The invention can generate the high temperature of 400 to 800 DEG C in the burning zone of the fire oil layer slug, which is in favor of the water stored in an individual well after the steam soaking to be vaporized as high-dryness steam; the temperature of the bottom of the injection well, and the dryness of the steam injected by the following steam drive are improved; the strata pressure is improved; larger producing pressure differential is achieved, which is in favor of improving the lifting rate of the oil well; moreover, the invention is in favor of shortening the low-production period at the beginning period of the steam drive and improving the developing effects of the steam drive and the recovery ratio of crude oil.

Description

technical field [0001] The present invention relates to a mining technology for heavy oil reservoirs, in particular to a combination of steam huff and puff followed by fire oil layer slug and steam flooding before exploitation of incinerated oil layers in heavy oil reservoirs. Methods of extracting crude oil. Background technique [0002] A commonly used method in petroleum exploitation is steam injection thermal recovery, which is only used for heavy oil reservoirs with high viscosity and poor fluidity, that is, reservoirs with crude oil viscosity greater than 50mPa.s under the conditions of oil layer temperature and crude oil containing dissolved gas. Steam huff and puff thermal recovery is to continuously inject a certain amount of steam into a production well in a short period of time, shut down the well for several days, and then start the well for production. Due to the short steam injection time, quick effect and good economic benefits, steam huff and puff is often u...

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Problems solved by technology

[0006] The main purpose of the present invention is to overcome the defects of large single well water storage and low crude oil recovery after steam huff and puff production, and to provide a new method of burning oil layers after steam huff and puff and before steam flooding. The method of plug mining and then turning to steam flooding to extract crude oil belongs to the method of extracting crude oil in three ways, that is, the combined mining method. The technical problem to be solved is that the combustion zone of the oil layer slug can generate a high temperature of 400 ° C to 800 ° C, which is conducive to the stimulation of vaporization steam. Exploitation and storage of water is beneficial to increase the bottom hole temperature of the steam injection well, to increase the dryness of the bottom steam after steam flooding, to increase the pressure of the oil layer, to establish a large production pressure difference, to increase the displacement of the oil well, and to increase the steam Improve the production-injection ratio during the flooding production period, shorten the initial low-production period of steam flooding, and improve the effect of steam flooding

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