Microbial desulfurization and viscosity preservation technology is effective

Recently, researchers from Shengli Oilfield Petroleum Engineering Technology Research Institute implemented microbial desulfurization and viscosity preservation technology
with a scale of 16,000 cubic meters per day in the isolated island oil production plant.
After implementation, the sulfide content in the produced water increased from 3 mg/L to less than 0.
2 mg/L, and the average viscosity of the wellhead polymer solution increased from 16.
9 mPa sec to 35 mPa sec, which ensured the development effect of
chemical flooding.

Shengli Oilfield polymerization release injector flooding adopts the method of dilution of produced water, and during operation, the agglomeration water sulfate reducing bacteria are seriously breeded, resulting in a large amount of sulfide, resulting in a significant reduction in the viscosity of the polymer solution wellhead, which affects the development effect
of polymerization.
To this end, researchers have studied and formed microbial desulfurization and viscosity preservation technology
.

This technology can not only remove the original sulfides in the produced water, but also effectively reduce the activity of sulfate-reducing bacteria and inhibit the production of new sulfides through the nutritional competition of microbial functional bacteria, and at the same time oxidize harmful sulfide products, so as to improve the effect
of polysulfide injection from the source.

Up to now, this technology has been applied to more than 90% of chemical flooding projects in Shengli Oilfield, with a daily processing capacity of 60,000 cubic meters, and the average viscosity of the wellhead has increased by 40% after implementation, ensuring the development effect
of chemical flooding.