The application belongs to the technical field of oil and gas field fracturing, and particularly discloses a ternary microbial
fracturing fluid system, a preparation method and application. The
system first proposes a ternary synergistic composite
system composed of a
guar gum
fracturing fluid base fluid, slick water and a source functional
microbial agent screened in an
oil field. The source functional
microbial agent synchronously produces beneficial products such as a biological surfactant with excellent oil washing capacity during a
metabolic process. The system completes reservoir
hydraulic fracturing and fracture creation, and injects the source
microorganism and its adaptive
nutrition system into the deep reservoir during a pumping process. After gel breaking, the system realizes energy supplement of the formation, and the
microorganism uses the gel breaking residual liquid as a
nutrition source to start large-scale
fermentation and
oil displacement material production in situ in the fracture system, thereby realizing integration of fracturing,
oil displacement and biological energy enhancement. The final
oil displacement efficiency of the system can be increased to more than 50%, which is significantly improved compared with conventional
fracturing fluid technology, and the system has the advantages of low reservoir damage, environmental friendliness, controllable cost, strong adaptability and the like.