Abstract
To study the flow mechanism under different displacement modes of low permeability carbonate reservoir in the Middle East and to improve the utilization of various types of reservoirs, the physical simulation experiments of water flooding by different displacement methods were carried out. Selecting two types of rock samples with different permeability levels, two-layer coinjection and separated production experiments by samples I and III and conventional water flooding experiments by samples II and IV were carried out. In addition, by using low magnetic field nuclear magnetic resonance, the development effect of microscopic pore structure under the different injection-production models was analyzed. Results show that, compared with the coinjection, the recovery rate of sample I was higher than II, 19.30%; sample III was lower than IV, 23.22%; and the comprehensive recovery degree reduced by 3.92%. NMR data also show that the crude oil is mainly distributed in the large pore throat; after water flooding, the displacement is also within the large pore throat, whereas the small pore throat is mainly obtained by the effect of infiltration absorption. The above studies provide a laboratory basis and foundation for the further development of low permeability carbonate reservoir in different Middle East strata.
Highlights
In recent years, the rational development of carbonate reservoirs has become a hot spot in the domestic and international oil industry
Based on the previous studies [5,6,7,8], we carried out colayer water flooding indoor simulation experiments and studied the microdistribution situation of residual oil and recovery degree of different pore range by means of low nuclear magnetic resonance (NMR) technique [9, 10]
The results provide some efficient technical policies for the development of Middle East reservoir
Summary
The rational development of carbonate reservoirs has become a hot spot in the domestic and international oil industry. Based on the previous studies [5,6,7,8], we carried out colayer water flooding indoor simulation experiments and studied the microdistribution situation of residual oil and recovery degree of different pore range by means of low nuclear magnetic resonance (NMR) technique [9, 10]. The results provide some efficient technical policies for the development of Middle East reservoir It has certain reference value for the development of colayer water flooding in other low permeability carbonate reservoir. NMR technique as a new rock analysis technology developed rapidly in recent years in the petroleum industry It can reflect the pore size distribution and the fluid volume in different pores, which can quantitatively calculate the displacement efficiency and residual oil in different pore size during water flooding oil. According to the property of recognizing hydrogen nucleus 1H of NMR technique, chlorofluorocarbon synthetic oil (no hydrogen nucleus 1H) was adopted to conduct physical simulation experiment, so that the signal measured by the NMR relaxation time spectrum was the distribution of the water phase in the rock sample
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