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Research into the inversion of the induced polarization relaxation time spectrum based on the uniform amplitude sampling method 被引量:1
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作者 Pu Zhang Sheng Wang +2 位作者 Kai-Bo Zhou Li Kong Hua-Xiu Zeng 《Petroleum Science》 SCIE CAS CSCD 2016年第1期64-76,共13页
The induced polarization relaxation time spectrum(RTS) reflects the distribution of rock pore size,which is a key factor in estimating the oil or water storage capacity of strata.However,as the data acquisition and ... The induced polarization relaxation time spectrum(RTS) reflects the distribution of rock pore size,which is a key factor in estimating the oil or water storage capacity of strata.However,as the data acquisition and transmission abilities of well logging instruments are much limited due to the underground environment,it is necessary to explore suitable sampling methods which can be used to obtain an accurate RST with less sampling data.This paper presents a uniform amplitude sampling method(UASM),and compares it with the conventional uniform time sampling method(UTSM) and logarithm time sampling method(LTSM) in terms of the adaptability to different strata,RTS inversion accuracy,and stratum vertical resolution.Numerical simulation results show that the UASM can obtain high inversion accuracy of RTS with different kinds of pore size distribution formation,with high dynamic ranges of pore size,and with a small number of sampling points.The UASM,being able to adapt to the attenuation speed of polarization curve automatically,thus has the highest vertical resolution.The inversion results of rock samples also show that the UASM is superior to the UTSM and LTSM. 展开更多
关键词 relaxation automatically adaptability instruments strata estimating inversion logarithm rock normalized
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Pore-scale investigation of residual oil displacement in surfactant–polymer flooding using nuclear magnetic resonance experiments 被引量:5
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作者 Zhe-Yu Liu Yi-Qiang Li +2 位作者 Ming-Hui Cui Fu-Yong Wang A.G.Prasiddhianti 《Petroleum Science》 SCIE CAS CSCD 2016年第1期91-99,共9页
Research on the Gangxi III area in the Dagang Oilfield shows that there was still a significant amount of oil remaining in oil reservoirs after many years of polymer flooding.This is a potential target for enhanced oi... Research on the Gangxi III area in the Dagang Oilfield shows that there was still a significant amount of oil remaining in oil reservoirs after many years of polymer flooding.This is a potential target for enhanced oil recovery(EOR).Surfactant–polymer(SP) flooding is an effective chemical EOR method for mobilizing residual oil and improving displacement efficiency macroscopically,but the microscopic oil displacement efficiency in pores of different sizes is unclear.Nuclear magnetic resonance(NMR) is an efficient method for quantifying oil saturation in the rock matrix and analyzing pore structures.In this paper,the threshold values of different pore sizes were established from the relationship between mercury injection curves and NMR T2 spectrums.The distribution and migration of residual oil in different flooding processes was evaluated by quantitatively analyzing the change of the relaxation time.The oil displaced from pores of different sizes after the water flood,polymer flood,and the SP flood was calculated,respectively.Experimental results indicate that(1) the residual oil in medium pores contributed the most to the incremental oil recovery for the SP flood,ranging from 40 % to 49 %,and small pores usually contributed /30 %;(2) the residual oil after the SP flood was mainly distributed in small and medium pores;the residual oil in medium pores accounted for 47.3 %–54.7 %,while that trapped in small pores was 25.7 %–42.5 %.The residual oil in small and medium pores was the main target for EOR after the SP flood in oilfields. 展开更多
关键词 flooding pores reservoirs surfactant migration remaining quantitatively rock relaxation sizes
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