多层长岩心水驱油实验数值模拟研究

Numer ical simulation study on multi- layer water
displac ing oil testw ith long core

于春生1 李 闽1 乔国安2 刘秋杰2

Yu Chunsheng ,LiM in, Q iao Guo’an, et al

1 西南石油大学油气藏地质及开发工程国家重点实验室, 四川成都610500;

2 中原油田分公司勘探开发科学研究院, 河南濮阳457001

( State Key Laboratory of O il and
Gas Reservo ir Geology and Exploita tion, Southwe st
Petro leum University, Chengdu 610500, China ),

M u lti- layer wa ter d isp lac ing oil test w ith long core is
done m ainly for reso lv ing the prob lem s o f inter - layer
contradiction, low w ate rflood ing effic iency and low -
perm eab ility rese rvo ir ex isted in vertically heterogeneous
reservo ir. Th is paper sim ulates the m atch ing labo ra tory
find ings by cons ide ring the thresho ld pressure g radien t after
fin ish ing the exper iment. The result show s that the m atch ing
resu lt of cons ide ring the thresho ld pressure grad ient is the
better one and is much c lose to the production perform ance o f
rea l reservo ir. U sing the gr id pressure and sa turation da ta
w hich are se lected from the better m atch ing resu lt model to
study flow fie ld, the findings ind ica te that pressure increased,
o il saturation dec reased w ith enhanc ing in jec tion rate in high,
m idd le and low perm eability reservo ir, bu t h igh -
perm eab ility reservo ir changes ind istinctly, low - perm eab ility
reservo ir pressure changes g reatly under d ifferen t work
routines and enhance injection rate. It w ill be decreased when
open ing the h igh- pe rm eab ility reservo ir. Converse ly, it w ill
be increased w hen shutting in the h igh - perm eab ility
reservo ir. The conclus ion is very important fo r reso lv ing
prob lem s during w ater in jec tion stage in vertically
heterogeneous reservo ir.