EOR TECHNOLOGIES AND APPLICATIONS IN MALAYSIA - CCOP
EOR TECHNOLOGIES AND APPLICATIONS IN MALAYSIA - CCOP
EOR TECHNOLOGIES AND APPLICATIONS IN MALAYSIA - CCOP
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To identify <strong>EOR</strong> potential, PETRONAS has conducted<br />
<strong>EOR</strong> screening study in year 2000<br />
• Based on the screening study, in Malaysian<br />
context, three <strong>EOR</strong> processes may be<br />
considered:<br />
Gas injection: miscible or immiscible in<br />
WAG or straight mode<br />
Chemical methods (surfactant, foam,<br />
polymer and gel),<br />
Microbial methods.<br />
CHEMICAL RECOVERY<br />
Recovery methods in this category may include surfactant, polymer and alkaline flooding. After a<br />
reservoir is conditioned by water preflush, specific chemicals are injected to reduce interfacial tension<br />
(help release oil) and /or improve mobility control (reduce channeling). This action is followed by<br />
injecting a driving fluid (water) to move the chemical and resulting oil bank to production wells.<br />
Mobility ratio is improved and flow through more permeable<br />
channels is reduced, resulting in increased volumetric sweep<br />
Single 5-Spot Pattern Shown)<br />
Injection<br />
Fluids<br />
Production<br />
Injection<br />
Well<br />
Pump<br />
Oil<br />
Injection<br />
Well<br />
Driving<br />
Fluid<br />
(Water)<br />
Fresh<br />
Water<br />
Buffer<br />
to<br />
Protect<br />
Polymer<br />
Solution<br />
For<br />
Mobility<br />
Control<br />
Additional<br />
Oil<br />
Recovery<br />
(Oil Bank)<br />
Preflush<br />
to<br />
Condition<br />
Reservoir<br />
MISCIBLE GAS FLOOD<strong>IN</strong>G GAS FLOOD<strong>IN</strong>G<br />
This method is a miscible displacement process applicable to many reservoirs. A gas slug<br />
followed by This alternate method water is a miscible and gas displacement injections (WAG) process is usually applicable the most to y man reservoirs. feasible method.<br />
A gas slug followed by alternate water and gas injections (WAG)<br />
Viscosity<br />
Viscosity<br />
of oil reduced<br />
of oil reduced<br />
providing<br />
providing<br />
more<br />
more<br />
efficient<br />
efficient<br />
miscible<br />
miscible<br />
displacement<br />
acement displ<br />
Produced Fluids (Oil, Gas and Water)<br />
Production well<br />
Separation and Storage Facilities<br />
Carbon Dioxide<br />
Water<br />
Injection well<br />
Injection<br />
Pump<br />
MICROBIAL FLOOD<strong>IN</strong>G<br />
Recovery by this method utilizes the effect of microbial solutions on a reservoir. The reservoir is usually<br />
conditioned by a water preflush, then a solution of microorganisms and nutrients is injected. As this<br />
solution is pushed through the reservoir by drive water, it forms gases and surfactants that help to<br />
mobilise the oil. The resulting oil and product solution is then pumped out through production well.<br />
Single 5-Spot Pattern Shown)<br />
Microorganisms<br />
and Nutrients<br />
Production<br />
Injection<br />
Well<br />
Pump<br />
Produced Oil and<br />
Injection<br />
Products<br />
Well<br />
Drive<br />
water<br />
Gas<br />
Water<br />
Mis.<br />
Oil<br />
Additional<br />
Gas<br />
zone<br />
Bank<br />
Oil<br />
Recovery<br />
Driving<br />
Fluid<br />
(Water)<br />
Nutrients<br />
Microorganisms<br />
Microbial<br />
Products<br />
for<br />
Releasing<br />
Oil<br />
Oil and<br />
Products<br />
Preflush<br />
to<br />
Condition<br />
Reservoir<br />
Systematic approach has been developed to identify<br />
<strong>EOR</strong> potential in Malaysia<br />
• The study screened 31 reservoirs from 16 fields in the Peninsular Malaysia and 39<br />
reservoirs from 19 fields in East Malaysia.<br />
• Considering some practical limitation (such as gas source and reservoir heterogeneity), 37<br />
reservoirs were identified to be technically feasible for IOR/<strong>EOR</strong> processes.<br />
• Numerical simulation models (sector) were developed for the group which has the highest<br />
remaining oil-in-place and the highest recovery for the selected <strong>EOR</strong> process identified in<br />
the first-level screening.<br />
GO/NO<br />
GO<br />
Screening<br />
Prediction<br />
Runs<br />
Reality<br />
Check<br />
Screening<br />
PRIze<br />
Prediction<br />
Runs<br />
Sector Model<br />
Prediction<br />
Runs<br />
To identify suitable<br />
IOR processes for<br />
major producing oil<br />
fields in Malaysia<br />
Prediction run with Three (3) criteria set<br />
sensitivity analyses by IOR Team<br />
for 6 reservoirs<br />
Prediction run to<br />
estimate<br />
incremental oil<br />
recovery through<br />
IOR process<br />
Prediction run by<br />
sector model on the<br />
top six (6) reservoir
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