A process for on-site biopolymer production related to enhanced oil recovery consisting of bacterium/fungus activation with selected substrates by placing them in a sterile, solid culture medium and incubating at a temperature until reaching a desired polysaccharide production level; performing a replication sequence is performed in a sterile, liquid culture medium to increase the amount of biomass to obtain a laboratory inoculum; fermenting in fermentation vats or bioreactors, where substrates are transformed by microorganisms into biopolymers and biomass; filtration or centrifugation, causing the biopolymer to separate from the biomass; a liquid polymer obtained is mixed with injection water in a static mixer, and then injected directly into a reservoir through an injection well.

Xanthomonas campestris for fermentative production of transparent xanthan gum and a method for using Xanthomonas campestris are provided. The Xanthomonas campestris is Xanthomonas campestris F417-6, deposited in Guangdong Province Microbiological Culture Collection Center on May 12, 2023, with a deposit number of GDMCC NO: 63459. The method includes preparing xanthan gum by performing fermentation using the Xanthomonas campestris as a fermentation strain.

Xanthomonas campestris for fermentative production of transparent xanthan gum and a method for using Xanthomonas campestris are provided. The Xanthomonas campestris is Xanthomonas campestris F417-6, deposited in Guangdong Province Microbiological Culture Collection Center on May 12, 2023, with a deposit number of GDMCC NO: 63459. The method includes preparing xanthan gum by performing fermentation using the Xanthomonas campestris as a fermentation strain.