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Ultra-deep formations hold abundant oil and gas resources.As the demand for oil and gas increases with economic development,more and more efforts are putting into the exploration and development of oil and gas reservoirs in deep formations around the world.In China,the exploration and development of deep oil and gas are pacing up,especially in ultra-deep formations in the Sichuan Basin,Tarim Basin and Ordos Basin.The reservoirs in these basins feature extremely large depth(over 7000 m),super high temperature(150°C-210°C),super high pressure(over 150 MPa),high acid gas content(H_2S and CO_2),strong heterogeneity,and multiple pressure systems,which pose a series of challenges to wellbore engineering technologies including drilling,drilling fluid,cementing,logging,and completion testing.Therefore,it is necessary to delve into core drilling and testing technologies for deep formations.
Ultra-deep formations hold abundant oil and gas resources. As the demand for oil and gas increases with economic development, more and more efforts are putting in exploration and development of oil and gas reservoirs in deep formations around the world. In China, the exploration and development of deep oil and gas are pacing up, especially in ultra-deep formations in the Sichuan Basin, Tarim Basin and Ordos Basin. reservoirs in these basins feature extremely large depth (over 7000 m), super high temperature (150 ° C-210 ° C), super high pressure (over 150 MPa), high acid gas content (H 2 S and CO 2), strong heterogeneity, and multiple pressure systems, which pose a series of challenges to wellbore engineering technologies including drilling, drilling fluid, cementing, logging, and completion testing.Therefore, it is necessary to delve into core drilling and testing technologies for deep formations.