Application of bio-enzyme gel breaker in hypersalinity water-based fracturing fluid product and fracturing fluid product

• Main Authors: SUN YUJUN, HAN JUNJIE, ZHAO JING, LIU YU, SUN XIUPENG
• Format: Patent
• Language: Chinese; English
• Published: 03.09.2021
• Subjects: ADHESIVES; CHEMISTRY; DYES; EARTH DRILLING; EARTH DRILLING, e.g. DEEP DRILLING; FIXED CONSTRUCTIONS; MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FORELSEWHERE; METALLURGY; MINING; MISCELLANEOUS APPLICATIONS OF MATERIALS; MISCELLANEOUS COMPOSITIONS; NATURAL RESINS; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR ASLURRY OF MINERALS FROM WELLS; PAINTS; POLISHES

The invention provides a fracturing fluid product, the fracturing fluid product comprises a base fluid, a gel breaking enzyme and a cross-linking agent, the base fluid, the gel breaking enzyme and the cross-linking agent are mixed when being used for hydraulic fracturing, and the gel breaking enzyme comprises beta-mannase produced by bacillus amyloliquefaciens CB-019 with the preservation number of CGMCC (China General Microbiological Culture Collection Center) No.11950. The fracturing fluid product disclosed by the invention can meet the low-temperature construction requirement of hypersalinity water, the hypersalinity water can be directly used for preparing the fracturing fluid, the problems that guar gum is gelatinized and tackified under the hypersalinity, the pH value is difficult to control, sand cannot be carried and the like are solved, and the requirements of stably increasing the yield and increasing the exploitation quantity are met. The gel breaking enzyme provided by the invention has an obvious