Gas injection oil well selecting method

Abstract

The invention discloses a gas injection oil well selecting method. The gas injection oil well selecting method comprises the step of selecting oil well gas injection effect influence factors, wherein the gas injection influence factors comprise construction positions, reservoir body types, well storage relations, remaining oil types, reserve sizes and water cut rising rules; and the step of conduction gas injection potential estimation on all oil wells in a working section sequentially according to the construction positions, the reservoir body types, the well storage relations, the remaining oil types, the reserve sizes and the water cut rising rules, and therefore the oil well to be subjected to gas injection primarily is selected. By means of the gas injection oil well selecting method, the oil well with gas injection potential can be rapidly selected, the gas injection periodic average oil increment is increased by years, up to now, the gas injection periodic average oil increment is greatly improved, and the gas injection effective rate can reach 96.1%. As a whole, by means of the gas injection oil well selecting method, ultra-deep layer fracture-cavity type oil deposit gas injection is greatly improved, the oil recovery effect is improved, and therefore the production benefits are greatly improved.

Description

technical field [0001] The invention relates to the technical field of oil and gas exploitation, in particular to a well selection method for gas injection oil wells. Background technique [0002] At present, gas injection is widely used as a recovery technology to replace water injection. However, the research and application are mainly aimed at sandstone reservoirs, and the research and application of gas injection enhanced recovery technology for ultra-deep fracture-cavity reservoirs at home and abroad There are few reports that gas injection enhanced oil recovery in ultra-deep fractured-cavity reservoirs in Tahe Oilfield has achieved remarkable results. Difficulties in understanding the relationship with fractures and caves, and a systematic well selection method has not been formed, resulting in insufficient demonstration of gas injection potential. Therefore, oil wells with gas injection potential cannot be selected quickly, and even if they are selected, it is labori...

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Problems solved by technology

[0002] At present, gas injection is widely used as a recovery technology to replace water injection. However, the research and application are mainly aimed at sandstone reservoirs, and the research and application of gas injection enhanced recovery technology for ultra-deep fracture-cavity reservoirs at home and abroad There are few reports that gas injection enhanced oil recovery in ultra-deep fractured-cavity reservoirs in Tahe Oilfield has achieved remarkable results. Difficulties in understanding the relationship with fractures and caves, and a systematic well selection method has not been formed, resulting in insufficient demonstration of gas injection potential

Therefore, it is impossible to quickly select oil wells with gas injection potential, even if they are selected, it is laborious and difficult to meet the requirements of high recovery

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