FIELD: chemistry.
SUBSTANCE: method to liquefy a fluid having an apparent viscosity of more than 5 cP and used for oil or natural gas production, where the liquid contains a water-soluble branched polysaccharide dissolved in water, selected from the group consisting of xanthan, diutan, and any derivatives thereof, and the method comprises the step of fluid contacting with one or more water-soluble persulfates and one or more strong bases, which is carried out at one or more temperatures less than 100°F (37.8°C). The method of well treatment comprises the following steps: creation of process fluid containing water, one or more branched aforementioned polysaccharides present in the water at a concentration at least sufficient to ensure process fluid viscosity of at least 5 cP, one or more water-soluble persulfates and one or more strong bases, introduction of this fluid into the well and its direction to one part of the well having a design temperature less than 100°F (37.8°C), wherein the step of fluid introduction further comprises injection under a pressure exceeding the subterranean formation fracture pressure. The invention is developed in subclaims.
EFFECT: increased processing efficiency at low and very low temperatures.
17 cl, 5 tbl
