Abstract
Based on the method of hydraulic fracturing, the simulation experimental device and method of wellbore strengthening pressure bearing capacity were established, and the optimization experimental study of wellbore strengthening process parameters was carried out. A new mechanism of wellbore strengthening based on the synergistic balance of fracturing damage and pressure-bearing capacity was proposed. The results show that the wellbore strengthening effect of intermittent squeezing is more significant than that of direct squeezing. Among them, the effect of constant pressure intermittent squeezing to improve the formation pressure bearing capacity is the best, followed by depressurization squeezing. With the increase of intermittent squeezing pressure, the pressure bearing capacity gradually decreases, and the optimal squeezing pressure is 1/4 of the fracturing pressure. Within the controllable range of rock strength and damage caused by hydraulic fracturing, the plugging efficiency of wellbore strengthening materials can be improved by appropriately increasing the times of squeezing. The optimal time of squeezing is about 5. Under the indoor simulation conditions, confining pressure has no significant effect on wellbore strengthening, which may reduce the plugging efficiency of wellbore strengthening materials.
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