Microbial multi-cycle huff and puff oil production method

Abstract

The invention discloses a microbial multi-cycle huff and puff oil production method. The method comprises the following steps that: strains are screened, acclimated, cultivated and produced; determined process of injection parameters which comprise strain liquid injection rate, nutrient solution injection rate, shortest well shutdown time t and multi-cycle huff and puff interval parameters; and an oil-well microbial community is tracked and monitored. In the method, the tracking and the monitoring are performed by molecular biology; a field process is improved by combining the actual production condition and a monitoring result; and the method has the advantages of simple construction process, low cost and high oil production efficiency.

Description

technical field [0001] The present invention relates to oil recovery technology, in particular to steam huff and puff recovery technology for heavy oil wells, and more specifically to a microbial multi-round huff and puff recovery method. Background technique [0002] In the prior art, the heavy oil well production method usually adopts the steam huff and puff method, and the production time of each cycle is 3-6 months, and the cost per ton of oil is about 400 yuan. However, with the increase of steam injection rounds, the steam injection effect of oil wells is getting worse, and the production time of each cycle is getting shorter and shorter, and the corresponding cycle production is reduced, resulting in a significant increase in oil production costs, making many oil wells It is close to the limit of steam huff and puff mining. In addition, the adverse consequences of long-term steam huff and puff are: the formation is severely damaged, and the downhole string is severel...

AI Technical Summary

Problems solved by technology

However, with the increase of steam injection rounds, the steam injection effect of oil wells is getting worse, and the production time of each cycle is getting shorter and shorter, and the corresponding cycle production is reduced, resulting in a significant increase in oil production costs, making many oil wells Approaching the limit of steam huff and puff mining

In addition, the adverse consequences of long-term steam huff and puff are: the formation is severely damaged, and the downhole string is seriously damaged or even scrapped.

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