Method of improving deep super-thick oil reservoir recovery efficiency

Abstract

The invention relates to a novel method capable of improving deep super-thick oil reservoir recovery efficiency. According to the method, in the steam huff and puff and steam flooding processes, a water-soluble nano-catalyst is injected to make the viscosity of super-thick oil under the condition of an oil reservoir be reduced substantially, as a result, the fluidity of the super-thick oil under the condition of the oil reservoir is improved, the shortcomings that a deep super-thick oil reservoir is high in steam injection pressure and low in well bottom steam dryness are effectively overcome, steam injection quantity also can be reduced, and the purpose of economical and efficient development of the deep super-thick oil reservoir is achieved. On the basis of steam huff and puff and steam flooding, the method of improving deep super-thick oil reservoir recovery efficiency can reduce the velocity of crude oil by more than 80%, increase the recovery percent by about 15%, and increase the gas-oil ratio in a huff and puff well period by 0.15.

Description

technical field [0001] The invention relates to a new method for improving the recovery rate of deep super-heavy oil reservoirs, in particular to a new method for deep super-heavy oil production by injecting water-soluble nano-catalysts into formations, which belongs to the category of oil recovery technology. Background technique [0002] At present, ultra-heavy oil production mainly uses steam injection to improve the fluidity of ultra-heavy oil and realize the effective production of ultra-heavy oil. However, for deep ultra-heavy oil, due to the high viscosity of the crude oil, it is like a thick thick oil wall in the formation, making it difficult for steam to penetrate in. The thermal sweep volume of steam injection is very limited, that is, it can only heat Heavy oil with small underground volume; the reservoir is buried deep (greater than 1800m), the steam injection pressure is high, the steam injection quality is basically 0, the cycle oil-steam ratio is low, and the...

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Problems solved by technology

There is no report on the method of water-soluble nano-catalysts to improve the recovery of deep ultra-heavy oil reservoirs