| Slickwater fracturing has become a major increase production technology in the development of shale gas,dense oil and other unconventional oil and gas resources.In order to ensure the effect of slick-water fracturing,it has a great practical significance for the application of slick-water fracturing in unconventional reservoirs to study the application of fracturing extension in fracturing process.This paper fully investigates the development of hydraulic fracturing technology and the research status of crack extension simulation.Based on the theory of fracture mechanics and extended finite element method(XFEM),the two-dimensional plane model of slick-water fracturing fractures is established by modifying the INP file generated during the pre-editing modeling process in ABAQUS software.This paper analyzes the influence of the fracturing fluid loss in a single hydraulic fracture on the stress field of the surrounding strata,and the extended state of simultaneous fracturing of several hydraulic fractures.Then,the influence of different ground stress difference and fracture pitch on hydraulic fracture extension is analyzed.The interaction between natural fracture and artificial fracture is also found in the existence of natural cracks in the formation.Through the simulation and analysis,it is found that the fracturing fluid in the hydraulic fractures will have a certain influence on the stress field of the surrounding strata.The extension rule of the two and three hydraulic fractures under different ground stress differences is summarized.The fracture distance between two hydraulic fractures is optimized,and the natural crack is induced to extend along the direction of the maximum horizontal principal stress when the hydraulic fracturing is extended.The above analysis results provide a theoretical basis and reference for the actual fracturing design. |
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