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Oil and gas are critical resources for the functioning of human societies.A key challenge in exploiting the unconventional oil and gas in hotter and deeper reservoirs is the reliable technology for HPHT (high pressure and high temperature) application.A novel sealing material based on Carbon Nanotubes-Polymer (CNT-Polymer) nanocomposites was developed for producing the oil and gas from deep and hot reservoirs.Fully dispersing CNT into polymer and poor bonding between CNT and polymer are two critical features that enhance the material mechanical properties.