Daqing Oilfield has carried out the production of polymer flooding was promoted since in 1996. Presently, polymer flooding is very successful in several production plants of Daqing Oilfield, and getting into industria...Daqing Oilfield has carried out the production of polymer flooding was promoted since in 1996. Presently, polymer flooding is very successful in several production plants of Daqing Oilfield, and getting into industrialization production. It has played a very important role in maintaining the oilfield stable production of over 50 million tons of oil. But the high permeability variation is serious, resulting in polymer production in some production wells recylingly and production concentration increasing slowly, which adversely affects polymer flooding efficiency. Chlloid dispersion gels (CDG) is a unique in - depth permeability modification process. It can reduce in - depth reservoir permeability variation by moving into highly permeable, water saturated zones and providing high resistance to subsequent water injection in those zones, so that oil can be produced from tighter rock. So CDG can enlarge volumetric sweep, and improve oil recovery efficiency. We had a CDG pilot programme in Daqing Oil Field in 1999, now this pilot has been entering into effective period with produing more oil and less water.展开更多
The eutectoid decomposition reaction that occurred in RECo5 phases（RE=Dy and Gd ） at low temperature was discussed and confirmed by X-ray powder diffraction（XRD）, differential thermal analysis, and scanning electr...The eutectoid decomposition reaction that occurred in RECo5 phases（RE=Dy and Gd ） at low temperature was discussed and confirmed by X-ray powder diffraction（XRD）, differential thermal analysis, and scanning electron microscopy.The decomposition temperature of the GdCo5 and DyCo5 were identified as 805.8 and 900 °C, respectively.The GdCo5 and DyCo5 phases could not be found in the isothermal section of Gd-Dy-Co ternary system at 800 K.Reasons for the absence of the RE2Co7 phase in the XRD patterns were discussed in detail.展开更多
In order to recognize the distribution of dispersed remaining oil,reservoirs should be described in more detail and quantitatively to establish refined and sophisticated 3D quantified reservoir model which can reflect...In order to recognize the distribution of dispersed remaining oil,reservoirs should be described in more detail and quantitatively to establish refined and sophisticated 3D quantified reservoir model which can reflect the detailed variation in the reservoir and its structure.The key point of sophistication and quantification of reservoir characterization is to describe the geo-metry of interwell sandbodies and to estimate their reservoir parameters.展开更多
Cultural identity in Geiogamah's play 49 represented a common concern of contemporary American Indian writers.Geiogamah highlighted the renewal and reconstruction of tribe tradition and cultural identity for nativ...Cultural identity in Geiogamah's play 49 represented a common concern of contemporary American Indian writers.Geiogamah highlighted the renewal and reconstruction of tribe tradition and cultural identity for native Indians.He stressed the imperative of maintaining ethnic tradition in identity quest by way of cultural rejuvenation,and ritual experience.The play dem onstrated that the way for the Indians in the modernization is to protect national culture,return to the tribe tradition and face the social reality.展开更多
文摘Daqing Oilfield has carried out the production of polymer flooding was promoted since in 1996. Presently, polymer flooding is very successful in several production plants of Daqing Oilfield, and getting into industrialization production. It has played a very important role in maintaining the oilfield stable production of over 50 million tons of oil. But the high permeability variation is serious, resulting in polymer production in some production wells recylingly and production concentration increasing slowly, which adversely affects polymer flooding efficiency. Chlloid dispersion gels (CDG) is a unique in - depth permeability modification process. It can reduce in - depth reservoir permeability variation by moving into highly permeable, water saturated zones and providing high resistance to subsequent water injection in those zones, so that oil can be produced from tighter rock. So CDG can enlarge volumetric sweep, and improve oil recovery efficiency. We had a CDG pilot programme in Daqing Oil Field in 1999, now this pilot has been entering into effective period with produing more oil and less water.
基金supported by the National Natural Science Foundation of China (50471108)the Natural Science Foundation of Guangxi (0448022, 0540009, 0640040)Key Project of Guangxi University for Nationality (2007, 2008)
文摘The eutectoid decomposition reaction that occurred in RECo5 phases（RE=Dy and Gd ） at low temperature was discussed and confirmed by X-ray powder diffraction（XRD）, differential thermal analysis, and scanning electron microscopy.The decomposition temperature of the GdCo5 and DyCo5 were identified as 805.8 and 900 °C, respectively.The GdCo5 and DyCo5 phases could not be found in the isothermal section of Gd-Dy-Co ternary system at 800 K.Reasons for the absence of the RE2Co7 phase in the XRD patterns were discussed in detail.
文摘In order to recognize the distribution of dispersed remaining oil,reservoirs should be described in more detail and quantitatively to establish refined and sophisticated 3D quantified reservoir model which can reflect the detailed variation in the reservoir and its structure.The key point of sophistication and quantification of reservoir characterization is to describe the geo-metry of interwell sandbodies and to estimate their reservoir parameters.
文摘Cultural identity in Geiogamah's play 49 represented a common concern of contemporary American Indian writers.Geiogamah highlighted the renewal and reconstruction of tribe tradition and cultural identity for native Indians.He stressed the imperative of maintaining ethnic tradition in identity quest by way of cultural rejuvenation,and ritual experience.The play dem onstrated that the way for the Indians in the modernization is to protect national culture,return to the tribe tradition and face the social reality.
