Abstract
Hydraulic fracture propagation characteristics in glutenite formation are studied by a series of servo-controlled triaxial large-scale fracturing experiments. The experimental results show that the fractures extend along the gravel and sandstone cementing face, and fracture geometry in glutenite formation is complex, which is similar to network fractures. The phenomenon of the gravel being split has not been observed. In the process of the fracture extension, the extension pressure is fluctuating, and the degree of fluctuation is more drastic with the gravel diameter increase. This paper suggests that using large rate and multislug technology would increase the flow ability of the carrying fluid. The conclusions are significant to hydraulic fracturing in glutenite formation.
Highlights
Glutenite reservoir is widely distributed in China, such as the Sheng Li oil field and Xinjiang oil field
The hydraulic fracture extension pressure is influenced by the gravel in glutenite reservoir, which usually leads to the failure of the fracturing treatment
Based on the experimental study, the following major conclusions are made for fracturing in glutenite formation
Summary
Glutenite reservoir is widely distributed in China, such as the Sheng Li oil field and Xinjiang oil field. Chen et al [1, 2] and Jin et al [3] performed a series of large-scale triaxial experiments to investigate the influence of natural fractures and earth stress on the induced fractures. Bohloli and de Pater [4] performed a series of large-scale triaxial experiments to study the hydraulic fracturing in soft rocks. They observed that fractures obtained at high stress were short, branched, and tortuous while those obtained at low stress were mainly longer, straight, and less tortuous. Yan et al [6] conducted scaled laboratory experiments to investigate hydraulic fracture initiation mechanisms in porous reservoirs and fractured reservoirs They observed that the fracture propagation pressure is smooth and steady. Liu et al [7] simulated the influence of natural fracture network on the propagation geometry of hydraulic fractures
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