Imitating the effects of drilling fluid invasion on the strength behaviors of hydrate-bearing sediments: An experimental study

The drilling fluid invasion into hydrate-bearing sediments will change the geomechanical properties of reservoir and may lead to uncontrolled geological disasters in worst case. Native are replaced with artificial samples this study investigate effect on strength behaviors sediments. triaxial test is used primarily assess at varying temperatures, pressures, hydrate saturation levels. process water-based penetrating then experimentally imitated under various experimental conditions, temperature 4°C pore pressure 10 MPa. possible repercussions phase transition identified by testing mechanical times temperatures. findings reveal that when rises from 5% 35%, gas shift strain hardening softening, critical value between 15% 25%. Peak increases increasing pressure, decreases temperature, whether present or not. peak strength, Young’s modulus, shear secant modulus all decreased significantly after invasion, although Poisson’s ratio rose. These parameters related action fluid. Finally, engineering research recommendations for reducing risk dissociation made based theoretical analysis. This innovatively examine invading reservoir, which avoiding production concerns.