Method for mining deep and ultra-deep thick oil pools by using double horizontal well fire flooding drainage

Abstract

The invention discloses a method for mining deep and ultra-deep thick oil pools by using double horizontal well fire flooding drainage. A horizontal flooding well network is arranged in a thick oil pool mining region, an injection well and a production well are arranged in an oil layer at the same vertical plane to form a horizontal flooding well pair, the horizontal section of the production well is located on the lower portion of the horizontal section of the injection well and is parallel with the horizontal section of the injection well, the injection well and the production well conduct steam injection cycling preheating at the same time, when the temperature of the oil layer between the horizontal sections of the injection well and the production well is raised to the preset temperature, the injection well and the production well stop the cycling preheating at the same time, a slug of oxygen enriched air is injected by the injection well continuously, the oil layer of the horizontal sections is lighted, the air is injected by the injection well after lighting, and the production well conducts continuous mining production. Compared with normal steam flooding mining methods such as a steam assistant gravity oil drainage technology, the method has the advantages that the recovery ratio is increased by more than 10-20%, the ultimate recovery ratio can reach more than 60% and the economic benefits are better than other methods.

Description

technical field [0001] The invention relates to a mining method for heavy oil reservoirs in the field of petroleum exploitation, in particular to a mining method for deep and ultra-deep heavy oil reservoirs using a dual-horizontal well fire flooding oil drainage technology. Background technique [0002] Deep and ultra-deep heavy oil reservoirs refer to heavy oil reservoirs with a burial depth greater than 1,500 meters, which have huge reserves in Tuhalukqin and other places in my country. The development technologies of heavy oil reservoirs usually include steam flooding technology, steam assisted gravity drainage technology, steam huff and puff technology and other steam injection development technologies, but for deep and ultra-deep heavy oil reservoirs, there are many problems in the above steam injection development technologies. [0003] Steam-assisted gravity drainage technology was invented by Canada's Bulter in 1978, and has been successfully applied in heavy oil res...

AI Technical Summary

Problems solved by technology

[0008] The object of the present invention is to provide a kind of deep and ultra-deep heavy oil reservoir dual-horizontal well fire flooding oil recovery method, which can effectively overcome the problems of low steam heat utilization rate in the process of steam injection in deep and ultra-deep heavy oil reservoirs, This mining method has the characteristics of high yield, low energy consumption, high recovery rate, and low safety risk.

Images