Stimulation Recovery On Cyclic Steam And Steam Flooding For Common Heavy Oil Reservoir With Edge-Bottom Water

The FNE oilfield in block 6 of Sudan is put into development in 2012.It is a typical common heavy oil reservoir with edge-bottom water,which is still in the initial stage of development now.The paper takes the FNE oilfield as the research object,in view of the present low recovery efficiency?low single well productivity and fast growth of water cut about this oilfield,the cyclic steam and steam flooding research is launched.According with the characteristics of the FNE reservoir,The paper applies numerical simulation theory and research technique to establish the actual reservoir model,and studies the feasibility of cyclic steam and steam flooding in FNE oilfield with using conventional vertical well and horizontal well?the main factors affecting cyclic steam stimulation(steam injection rate,steam injection strength,bottomhole steam quality,soak time)and sensitivity of edge-bottom water to the cyclic steam(water scale,permeability of interbed,thickness of imperforated),finally it researches the time of converting into steam flooding and optimizes the steam flooding parameters(steam injection rate,bottomhole steam quality,production and injection ratio).On the results of above study,five case with different well pattern and well spacing are designed in the test area,and the coMParative analysis is carried out,finally two cases are chosen the optimization program for the FNE oilfield.One is inversed nine point pattern with small well spacing,the other is the combination of vertical and horizontal well in five point pattern.The paper provides a theoretical basis and technical support for the later large-scale thermal development of the FNE oilfield.