Carbon dioxide(CO_(2))flooding is a widely applied recovery method during the tertiary recovery of oil and gas.A high water saturation condition in reservoirs could induce a‘water shielding’phenomenon after the inje...Carbon dioxide(CO_(2))flooding is a widely applied recovery method during the tertiary recovery of oil and gas.A high water saturation condition in reservoirs could induce a‘water shielding’phenomenon after the injection of CO_(2).This would prevent contact between the injected gas and the residual oil,restricting the development of the miscible zone.A micro-visual experiment of dead-end models,used to observe the effect of a film of water on the miscibility process,indicates that CO_(2)can penetrate the water film and come into contact with the residual oil,although the mixing is significantly delayed.However,the dissolution loss of CO_(2)at high water-cut conditions is not negligible.The oil-water partition coefficient,defined as the ratio of CO_(2)solubility in an oil-brine/two-phase system,keeps constant for specific reservoir conditions and changes little with an injection gas.The NMR device shows that when CO_(2)flooding follows water flooding,the residual oil decreasesdnot only in medium and large pores but also in small and micro pores.At levels of higher water saturation,CO_(2)displacement is characterized initially by a low oil production rate and high water-cut.After the CO_(2)breakthrough,the water-cut decreases sharply and the oil production rate increases gradually.The response time of CO_(2)flooding at high watercut reservoirs is typically delayed and prolonged.These results were confirmed in a pilot test for CO_(2)flooding at the P1-1 well group of the Pucheng Oilfield.Observations from this pilot study also suggest that a larger injection gas pore volume available for CO_(2)injection is required to offset the dissolution loss in high water saturation conditions.展开更多
Climate science deals with the harsh reality of 174,000 terawatt of solar energy striking Earth’s surface&air,minus 29 percent albedo.The exposure is sustained by the planet cooling itself by means of EM radiatio...Climate science deals with the harsh reality of 174,000 terawatt of solar energy striking Earth’s surface&air,minus 29 percent albedo.The exposure is sustained by the planet cooling itself by means of EM radiation emitted to outer space of a like amount of energy in the infrared range.The balance may not be perfect at all times,but miraculously we are still around&attempting to comprehend the physical processes involved in keeping the planet’s surface suitable to sustain biological life&human civilization.While ground temperature is maintained at a pleasant avg 288 kelvin=15℃by the atmospheric greenhouse effect,a surprising 255 kelvin satisfies the demand for radiative cooling.This just happens to be standard air temperature at 5,000 m altitude.Official climate science largely is concerned with models&has assigned a major role to carbon molecules in air.As these exist currently only at mere trace levels,they are widely considered to be irrelevant for climate in view of the Mass-Action Law that implies that trace components can have only trace effects.Denying this simple fact,familiar to meteorologists,unfortunately has led to much of the civilized public being misled by climate scientists.One of the themes among their rhetoric is calling for renewable energy sources,when in reality unlimited amounts of hydrogen&hydrocarbons are dissolved in the Earth’s mantle,going back to the primitive solar nebula that gave rise to our solar system,&available for human consumption through fracking.Here in this philosophical essay,we are offering simple empirical proofs,examples from everday life,as opposed to the largely theoretical modeling work of climate science,for the fact that atmospheric carbon molecules can have only trace effects on radiative planetary cooling,proofs that are easy to verify.We dispute unrealistic estimates of important effects on climate from carbon dioxide trace gas via an atmospheric feedback mechanism proposed by some climate scientists.The essay demonstrates that atmospheric carbon molecules are irrelevant for climate at this epoch.Humanity is not facing a carbon climate crisis,currently.展开更多
文摘Carbon dioxide(CO_(2))flooding is a widely applied recovery method during the tertiary recovery of oil and gas.A high water saturation condition in reservoirs could induce a‘water shielding’phenomenon after the injection of CO_(2).This would prevent contact between the injected gas and the residual oil,restricting the development of the miscible zone.A micro-visual experiment of dead-end models,used to observe the effect of a film of water on the miscibility process,indicates that CO_(2)can penetrate the water film and come into contact with the residual oil,although the mixing is significantly delayed.However,the dissolution loss of CO_(2)at high water-cut conditions is not negligible.The oil-water partition coefficient,defined as the ratio of CO_(2)solubility in an oil-brine/two-phase system,keeps constant for specific reservoir conditions and changes little with an injection gas.The NMR device shows that when CO_(2)flooding follows water flooding,the residual oil decreasesdnot only in medium and large pores but also in small and micro pores.At levels of higher water saturation,CO_(2)displacement is characterized initially by a low oil production rate and high water-cut.After the CO_(2)breakthrough,the water-cut decreases sharply and the oil production rate increases gradually.The response time of CO_(2)flooding at high watercut reservoirs is typically delayed and prolonged.These results were confirmed in a pilot test for CO_(2)flooding at the P1-1 well group of the Pucheng Oilfield.Observations from this pilot study also suggest that a larger injection gas pore volume available for CO_(2)injection is required to offset the dissolution loss in high water saturation conditions.
文摘Climate science deals with the harsh reality of 174,000 terawatt of solar energy striking Earth’s surface&air,minus 29 percent albedo.The exposure is sustained by the planet cooling itself by means of EM radiation emitted to outer space of a like amount of energy in the infrared range.The balance may not be perfect at all times,but miraculously we are still around&attempting to comprehend the physical processes involved in keeping the planet’s surface suitable to sustain biological life&human civilization.While ground temperature is maintained at a pleasant avg 288 kelvin=15℃by the atmospheric greenhouse effect,a surprising 255 kelvin satisfies the demand for radiative cooling.This just happens to be standard air temperature at 5,000 m altitude.Official climate science largely is concerned with models&has assigned a major role to carbon molecules in air.As these exist currently only at mere trace levels,they are widely considered to be irrelevant for climate in view of the Mass-Action Law that implies that trace components can have only trace effects.Denying this simple fact,familiar to meteorologists,unfortunately has led to much of the civilized public being misled by climate scientists.One of the themes among their rhetoric is calling for renewable energy sources,when in reality unlimited amounts of hydrogen&hydrocarbons are dissolved in the Earth’s mantle,going back to the primitive solar nebula that gave rise to our solar system,&available for human consumption through fracking.Here in this philosophical essay,we are offering simple empirical proofs,examples from everday life,as opposed to the largely theoretical modeling work of climate science,for the fact that atmospheric carbon molecules can have only trace effects on radiative planetary cooling,proofs that are easy to verify.We dispute unrealistic estimates of important effects on climate from carbon dioxide trace gas via an atmospheric feedback mechanism proposed by some climate scientists.The essay demonstrates that atmospheric carbon molecules are irrelevant for climate at this epoch.Humanity is not facing a carbon climate crisis,currently.
