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The Study Of Residual Oil In Natural Water Influx Mature Oil Field

Posted on:2007-09-17Degree:DoctorType:Dissertation
Country:ChinaCandidate:Y S WangFull Text:PDF
GTID:1100360182480151Subject:Mineral prospecting and exploration
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Generally and approximately, only 30% of original oil in place (OOIP) can be produced,therefore, to enhance oil recovery is equally to find a new oilfield in the point view ofproduction. However, under the condition of no innovational development for productiontechnology and stimulation operations, to study residual oil is the most economic and feasiblemethod to enhance oil recovery, which reflects the target and significance of this dissertation.The study of development adjustment and exploration for Peru block 1-AB and block 8 is oneof the key scientific research projects of China National Petroleum Corporation (CNPC).Mostoilfields in these two blocks were developed from 1970s, currently with characteristics ofstrong natural water flooding and super-high water cut, among which Corrientes oilfield hasthe highest productivity with representative performance of high productivity differenceamong wells and residual oil is dispersing and becoming complicated, triggering ever-increasing difficulty for its development.The main reservoir developed in later Cretaceous system, locating in the joint belt of sea andterritory, with strong water body energy. Chonta formation, the lower part of upper Cretaceoussystem, belongs to tide delta sediment, experienced by the effects of both sea regression andsea transgression;developed with channel, main channel area, sand body between channels aswell as beach sand bar sediment;and Vivian formation, the top of Cretaceous system, isbraided channel sediment due to sea surface and coast descending.Faced with complex geology problems, formation and fluid is firstly separated to form clearstudy means, formation is treated as the three-dimension(3D) geology body, formation fluidbehaviors the four-dimension(4D) performance, namely, fluid properties varying withproduction time. As for 3D geology body, based on sequence stratigraphy and relevanttheories, all relevant new technologies and methods, the method of point-line-plane-body isin-depth studied, namely, formation and interlayer and barriers is analyzed by well data, line-shaped geology profile is studied from well point combined with seismic materials.Stratigraphic classification of geology profile extends to the plane small formation surfacesthat are used as constraints to compose 3D geology body;as for fluid, constrained by 3Dformation, 4D dynamic analysis is conducted. Finally, theory and application results withimportant significance are concluded.By using the theory of sequence stratigraphy isochronal comparison, the detailed investigationon the structure, sedimentation and reservoir of element formation was conducted. Theseresearch results pave the way for the study of residual oil. On the basis of establishment ofhigh resolution formation framework, the whole field variation of oil-water interface and log-facies were analyzed by identifying the micro-facies and their corresponding well log data,setting up the model of log-facies or litho-electricity for vary types of micro-facies andutilizing the litho-electric relationships. To token the variation and distribution of reservoirs indifferent types, a quantitative and indexical reservoir heterogeneity model was established bymeans of mathematical statistics. This is the first time to apply the theory of fluid potential tothe investigation of residual oil in Peru. These achievements provide the theoretical supportfor the widely research of remaining oil and their applications. Meanwhile, a model namedPotential Controlled Residual Oil Distribution Model can be utilized to investigate theresidual oil was proposed. As a result, the area and the direction for increasing the oilproduction are expended.
Keywords/Search Tags:Residual oil, Oil-water interface, Fluid potential, Reservoir heterogeneity
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