Fe-12Cr-2.5W-x Si-0.4Ti-0.3Y_(2)O_(3)alloys were fabricated by mechanical alloying and vacuum sintering.The effect of sintering temperature and Si content on the microstructure and properties of the alloy was investig...Fe-12Cr-2.5W-x Si-0.4Ti-0.3Y_(2)O_(3)alloys were fabricated by mechanical alloying and vacuum sintering.The effect of sintering temperature and Si content on the microstructure and properties of the alloy was investigated systematically.The experimental results show that the relative density and tensile strength of the alloy were increased with the elevating of sintering temperature and Si content within a certain range.The alloy with 1wt%Si sintered at 1350℃exhibited superior properties,and the relative density and tensile strength were 96.8%and 692.7 MPa,respectively.HAADF and EDAX analysis of nano-precipitation in the matrix indicated that Si could combine with Y,Ti,and O in the sintering process,which was uniformly distributed with the size of 10 nm.Portion of Y_(2)O_(3)had not completely dissolved in the milling process,which was retained in the matrix of the alloy.展开更多
The history and results of petroleum exploration in the Santos Basin, Brazil are reviewed. The regularity of hydrocarbon enrichment and the key exploration technologies are summarized and analyzed using the seismic, g...The history and results of petroleum exploration in the Santos Basin, Brazil are reviewed. The regularity of hydrocarbon enrichment and the key exploration technologies are summarized and analyzed using the seismic, gravity, magnetic and drilling data. It is proposed that the Santos Basin had a structural pattern of two uplifts and three depressions and the Aram-Uirapuru uplift belt controlled the hydrocarbon accumulation. It is believed that the main hydrocarbon source kitchen in the rift period controlled the hydrocarbon-enriched zones, paleo-structures controlled the scale and quality of lacustrine carbonate reservoirs, and continuous thick salt rocks controlled the hydrocarbon formation and preservation. The process and mechanism of reservoirs being transformed by CO_(2)charging were revealed. Five key exploration technologies were developed,including the variable-velocity mapping for layer-controlled facies-controlled pre-salt structures, the prediction of lacustrine carbonate reservoirs, the prediction of intrusive/effusive rock distribution, the detection of hydrocarbons in lacustrine carbonates, and the logging identification of supercritical CO_(2)fluid. These theoretical recognitions and exploration technologies have contributed to the discovery of deep-water super-large reservoirs under CNODC projects in Brazil, and will guide the further exploration of deep-water large reservoirs in the Santos Basin and other similar regions.展开更多
基金Funded by the Natural Science Foundation of China(No.51801140)the Fundamental Research Funds for the Central Universities(No.WUT3120619103)。
文摘Fe-12Cr-2.5W-x Si-0.4Ti-0.3Y_(2)O_(3)alloys were fabricated by mechanical alloying and vacuum sintering.The effect of sintering temperature and Si content on the microstructure and properties of the alloy was investigated systematically.The experimental results show that the relative density and tensile strength of the alloy were increased with the elevating of sintering temperature and Si content within a certain range.The alloy with 1wt%Si sintered at 1350℃exhibited superior properties,and the relative density and tensile strength were 96.8%and 692.7 MPa,respectively.HAADF and EDAX analysis of nano-precipitation in the matrix indicated that Si could combine with Y,Ti,and O in the sintering process,which was uniformly distributed with the size of 10 nm.Portion of Y_(2)O_(3)had not completely dissolved in the milling process,which was retained in the matrix of the alloy.
基金Supported by the CNPC Basic and Prospective Key Scientific and Technological Project (2021DJ24)。
文摘The history and results of petroleum exploration in the Santos Basin, Brazil are reviewed. The regularity of hydrocarbon enrichment and the key exploration technologies are summarized and analyzed using the seismic, gravity, magnetic and drilling data. It is proposed that the Santos Basin had a structural pattern of two uplifts and three depressions and the Aram-Uirapuru uplift belt controlled the hydrocarbon accumulation. It is believed that the main hydrocarbon source kitchen in the rift period controlled the hydrocarbon-enriched zones, paleo-structures controlled the scale and quality of lacustrine carbonate reservoirs, and continuous thick salt rocks controlled the hydrocarbon formation and preservation. The process and mechanism of reservoirs being transformed by CO_(2)charging were revealed. Five key exploration technologies were developed,including the variable-velocity mapping for layer-controlled facies-controlled pre-salt structures, the prediction of lacustrine carbonate reservoirs, the prediction of intrusive/effusive rock distribution, the detection of hydrocarbons in lacustrine carbonates, and the logging identification of supercritical CO_(2)fluid. These theoretical recognitions and exploration technologies have contributed to the discovery of deep-water super-large reservoirs under CNODC projects in Brazil, and will guide the further exploration of deep-water large reservoirs in the Santos Basin and other similar regions.
