As a new method,the ultraviolet spectrum technique is applied to studying the connectivity of biodegradable heavy oil reservoirs.The similarity of crude oils can be judged according to the extinction coefficient(E) be...As a new method,the ultraviolet spectrum technique is applied to studying the connectivity of biodegradable heavy oil reservoirs.The similarity of crude oils can be judged according to the extinction coefficient(E) because aromatic hydrocarbons and non-hydrocarbons have conjugated bonds and obvious absorption in the ultraviolet range,and different materials have different characteristics and additives.The relationship diagram is made in terms of the extinction coefficients(E) of the samples by taking E as the Y-axis and wavelength as the X-axis.The connectivity of oil reservoirs is estimated according to the curve positions and characteristic fingerprints of the samples.The connectivity of part of the reservoirs in the western part of the QHD32-6 oilfield was studied with this method.The results showed that the connectivity of samples from wells F7 and F8 in the Nm-2 oil reservoir zone is good,that of samples from wells F17 and F20 in the Nm-1 oil reservoir zone also is good,and that of samples from wells F17,F19,and F20 is poor.展开更多
Based on the established mathematic model and graphic interpretation, a new method, which is used to calculate the contribution of single-zone production in a commingled producing well by the ultraviolet spectrum tech...Based on the established mathematic model and graphic interpretation, a new method, which is used to calculate the contribution of single-zone production in a commingled producing well by the ultraviolet spectrum technique, has been established. The standard plate was drawn using the extinction coefficient E of sample oils formulated artificially as y-axis and the wavelength as x-axis. The curve resulting from the UV analysis of sample oils in the commingled well was inserted into the standard plate and compared. The proportion of each single zone in the commingled producing well was identical with the proportion of the curve which is closest to the curve of sample oils formulated artificially. In the well QHD32-6-3 field, taking well A22 for example and using this method, the production contribution of a single zone was calculated. The result showed that the Nm4 zone is a major "contributor", the proportion of the Nm4 zone is 70%, and that of the Nm1 zone is 30%. The ultraviolet spectrum technique provided a new reservoir geochemical technique of monitoring production contribution, especially for biodegraded heavy oil, but it has some limitation, just depending on the GC fingerprint technique.展开更多
文摘As a new method,the ultraviolet spectrum technique is applied to studying the connectivity of biodegradable heavy oil reservoirs.The similarity of crude oils can be judged according to the extinction coefficient(E) because aromatic hydrocarbons and non-hydrocarbons have conjugated bonds and obvious absorption in the ultraviolet range,and different materials have different characteristics and additives.The relationship diagram is made in terms of the extinction coefficients(E) of the samples by taking E as the Y-axis and wavelength as the X-axis.The connectivity of oil reservoirs is estimated according to the curve positions and characteristic fingerprints of the samples.The connectivity of part of the reservoirs in the western part of the QHD32-6 oilfield was studied with this method.The results showed that the connectivity of samples from wells F7 and F8 in the Nm-2 oil reservoir zone is good,that of samples from wells F17 and F20 in the Nm-1 oil reservoir zone also is good,and that of samples from wells F17,F19,and F20 is poor.
文摘Based on the established mathematic model and graphic interpretation, a new method, which is used to calculate the contribution of single-zone production in a commingled producing well by the ultraviolet spectrum technique, has been established. The standard plate was drawn using the extinction coefficient E of sample oils formulated artificially as y-axis and the wavelength as x-axis. The curve resulting from the UV analysis of sample oils in the commingled well was inserted into the standard plate and compared. The proportion of each single zone in the commingled producing well was identical with the proportion of the curve which is closest to the curve of sample oils formulated artificially. In the well QHD32-6-3 field, taking well A22 for example and using this method, the production contribution of a single zone was calculated. The result showed that the Nm4 zone is a major "contributor", the proportion of the Nm4 zone is 70%, and that of the Nm1 zone is 30%. The ultraviolet spectrum technique provided a new reservoir geochemical technique of monitoring production contribution, especially for biodegraded heavy oil, but it has some limitation, just depending on the GC fingerprint technique.
