Research and Practice on Oil Displacement Law of Different Well Pattern in Offshore Oilfield
BZ oilfield is the first oilfield successfully developed with large-scale horizontal well pattern in Bohai fluvial facies oilfield.Under the guidance of similarity theory,Combined with the characteristics of offshore oilfield,such as large well spacing,few wells and complex well pattern,the author designs a heterogeneous reservoir model according to the reservoir conditions in the study area.The water displacement of horizontal well pattern and combined well pattern under different displacement speeds is simulated.The effects of heterogeneity,displacement speed and well pattern on water displacement effect are studied by measuring the electrical characteristics,injection volume,oil production and water production of the model.It is found that in the average reservoir,the horizontal well pattern is used for low-speed development,the water breakthrough of oil wells is slow,the EOR is large;In the heterogeneous(Jk=4)high permeability reservoir,the oilfield adopts staggered well pattern low-speed development,the water breakthrough of the oil well is slow,and the EOR is large;In the heterogeneous(Jk=6)high permeability reservoir,the oilfield adopts the combined well pattern for low-speed development,the water breakthrough of the oil well is slow,and the EOR is large.This study deepens the understanding of the development law of horizontal well pattern and the distribution law of remaining oil,and provides a basis for oilfield development and adjustment.
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