A high-pressure experimental apparatus for asphaltene precipitation is established and then used to determine the amount of asphaltene precipitation in degassed Caoqiao crude oil and recombined Caoqiao reservoir oil u...A high-pressure experimental apparatus for asphaltene precipitation is established and then used to determine the amount of asphaltene precipitation in degassed Caoqiao crude oil and recombined Caoqiao reservoir oil under gas (CO 2 and hydrocarbon gas) injection.The scaling equation for normal pressure n -alkane/asphaltene system is extended to high-pressure gas-injected oil systems and then tested by comparison with the present experimental data and those available in the literature.The results show that it can give good predictions for asphaltene precipitation behavior in high-pressure gas-injected oil systems.展开更多
In order to investigate zonal disintegration mechanism of isotropic rock masses around a deep spherical tunnel, a new mechanical model subjected to dynamic unloading under hydrostatic pressure condition is proposed. T...In order to investigate zonal disintegration mechanism of isotropic rock masses around a deep spherical tunnel, a new mechanical model subjected to dynamic unloading under hydrostatic pressure condition is proposed. The total elastic stress-field distributions is determined using the elastodynamic equation. The effects of unloading rate and dynamic mechanical parameters of isotropic deep rock masses on the zonal disintegration phenomenon of the surrounding rock masses around a deep spherical tunnel as well as the total elastic stress field distributions are considered. The number and size of fractured and non-fractured zones are determined by using the Hoek-Brown criterion. Numerical computation is carried out. It is found from numerical results that the number of fractured zones increases with increasing the disturbance coefficient, in-situ stress, unloading time and unloading rate, and it decreases with increasing parameter geological strength index, the strength parameter and the uniaxial compressive strength of intact rock.展开更多
基金国家自然科学基金 (No .2 0 0 0 60 10 )重质油加工国家重点实验室开放课题 (No .2 0 0 0 0 5 )石油大学 (北京 )校基金 (No .99-I -0 9)资助项目~~ .
文摘A high-pressure experimental apparatus for asphaltene precipitation is established and then used to determine the amount of asphaltene precipitation in degassed Caoqiao crude oil and recombined Caoqiao reservoir oil under gas (CO 2 and hydrocarbon gas) injection.The scaling equation for normal pressure n -alkane/asphaltene system is extended to high-pressure gas-injected oil systems and then tested by comparison with the present experimental data and those available in the literature.The results show that it can give good predictions for asphaltene precipitation behavior in high-pressure gas-injected oil systems.
基金Projects(51325903,51279218,51478065)supported by the National Natural Science Foundation of ChinaProject(2014CB046903)supported by the National Basic of Research Program ChinaProjects(cstc2013kjrc-ljrccj0001,cstc2013jcyjys30002,cstc2015jcyjys30001)supported by Chongqing Science and Technology Commission(CSTC),Chongqing,China
文摘In order to investigate zonal disintegration mechanism of isotropic rock masses around a deep spherical tunnel, a new mechanical model subjected to dynamic unloading under hydrostatic pressure condition is proposed. The total elastic stress-field distributions is determined using the elastodynamic equation. The effects of unloading rate and dynamic mechanical parameters of isotropic deep rock masses on the zonal disintegration phenomenon of the surrounding rock masses around a deep spherical tunnel as well as the total elastic stress field distributions are considered. The number and size of fractured and non-fractured zones are determined by using the Hoek-Brown criterion. Numerical computation is carried out. It is found from numerical results that the number of fractured zones increases with increasing the disturbance coefficient, in-situ stress, unloading time and unloading rate, and it decreases with increasing parameter geological strength index, the strength parameter and the uniaxial compressive strength of intact rock.
