Steam drive exploitation method for heavy oil reservoir

Abstract

The invention belongs to the field of oil exploitation, and relates to a steam drive exploitation method for a heavy oil reservoir, in particular to a steam drive exploitation method of intermediate-deep layer heavy oil aided by injecting air. The method comprises the following steps of synchronously and continuously injecting steam and air in a steam injection well according to a certain mass ratio in the process of intermediate-deep layer heavy oil steam drive production, and performing a low-temperature oxidation reaction between crude oil and oxygen. According to the method disclosed by the invention, heat utilization and recovery ratio of intermediate-deep layer heavy oil steam drive can be improved; a problem of steam channeling among injection and exploitation wells can be eased, and development effect of steam drive can be improved.

Description

technical field [0001] The invention belongs to the field of oil exploitation, and relates to a steam flooding mining method for heavy oil reservoirs, in particular to a mid-deep heavy oil air injection assisted steam flooding mining method. Background technique [0002] Heavy oil is an important petroleum resource in the 21st century. The reserves of heavy oil, super heavy oil and natural bitumen in the world are about 1000×10 8 tons, accounting for 53% of the world's remaining recoverable oil reserves, mainly distributed in Canada, Venezuela, the United States, China and other countries and regions. Heavy oil accounts for 40% of my country's remaining recoverable oil reserves, of which medium-deep heavy oil accounts for 70%. [0003] The way of heavy oil production is mainly to take measures to improve the fluidity of crude oil, increase the oil-water mobility ratio and increase the displacement efficiency of crude oil. At present, heavy oil recovery is mainly based on t...

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Problems solved by technology

[0007] One is the problem of deep burial and large heat loss along the steam

For medium-deep reservoirs (500-1400m), under the previous technological conditions, the dryness of the bottom hole is difficult to meet the requirements

[0008] Theoretical calculation and actual measurement of wellbore heat loss show that: under the condition of light oil pipe steam injection, hot water will be turned into hot water below 800m depth; under the condition of steam huff and puff heat insulation technology, the dryness of steam below 800m depth will be reduced to 30-35%. Thermal technology cannot meet the demand for steam dryness in mid-deep steam flooding

[0009] The second is the problem of high steam injection pressure and low utilization rate of steam heat energy under the condition of middle and deep layers

Therefore, this document does not explain how to control the injected air in the process of steam flooding to avoid the safety hazard of detonating the mixed gas of oil, gas and oxygen

[0014] In the existing technology, there are still problems of large steam heat loss and low heat utilization rate inside the oil layer

In order to ensure the effect of steam flooding development, it is necessary to increase the intensity of steam injection and increase the amount of steam injection during the on-site implementation process. On the one hand, this will cause a great waste of energy; The phenomenon of steam channeling between production wells is serious, resulting in low steam swept volume and a sharp drop in steam flooding oil production rate

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