2016_EJRNL_PP_SEYED_MORTEZA_TOHIDI_HOSSEINI_1.pdf
Terbatas  Suharsiyah
» Gedung UPT Perpustakaan
Terbatas  Suharsiyah
» Gedung UPT Perpustakaan
Steam Assisted Gravity Drainage (SAGD) as a successful enhanced oil recovery (EOR) process has
been applied to extract heavy and extra heavy oils. Huge amount of global heavy oil resources exists
in carbonate reservoirs which are mostly naturally fractured reservoirs. Unlike clastic reservoirs,
few studies were carried out to determine the performance of SAGD in carbonate reservoirs. Even
though SAGD is a highly promising technique, several uncertainties and unanswered questions still
exist and they should be clarified for expansion of SAGD methods to world wide applications
especially in naturally fractured reservoirs. In this communication, the effects of some operational
and reservoir parameters on SAGD processes were investigated in a naturally fractured reservoir
with oil wet rock using CMG-STARS thermal simulator. The purpose of this study was to investigate
the role of fracture properties including fracture orientation, fracture spacing and fracture
permeability on the SAGD performance in naturally fractured reservoirs. Moreover, one operational
parameter was also studied; one new well configuration, staggered well pair was evaluated. Results
indicated that fracture orientation influences steam expansion and oil production from the horizontal well pairs. It was also found that horizontal fractures have unfavorable effects on oil production, while vertical fractures increase the production rate for the horizontal well. Moreover, an
increase in fracture spacing results in more oil production, because in higher fracture spacing
model, steam will have more time to diffuse into matrices and heat up the entire reservoir.
Furthermore, an increase in fracture permeability results in process enhancement and ultimate
recovery improvement. Besides, diagonal change in the location of injection wells (staggered
model) increases the recovery efficiency in long-term production plan