Date post: | 24-May-2017 |
Category: |
Documents |
Upload: | renuga-subramaniam |
View: | 213 times |
Download: | 0 times |
FWS 06Courtesy of ExxonMobil
Lecture 15
Block7
Bonanza Basin
Discovery Well
Block8
SaltDiapir
Headlines: Alpha Wildcat Finds Thick Oil Zone!
L 15 – Beyond Exploration
FWS 06 L 15 – Next StepsCourtesy of ExxonMobil
Our Exploration Flowchart
WildcatDrilled
AssessProspects Success
InterpretSeismic Data
ProcessSeismic Data
AcquireSeismic Data
CapturePrime Areas
Identify Opportunities
Management Approved
Wildcat Well
L 15 – Beyond Exploration
Courtesy of ExxonMobil
FWS 06Courtesy of ExxonMobil
Our Assessment Results
0.0
0.2
0.4
0.6
0.8
1.0
0 100 200 300 400 500
Million Oil Equivalent Barrels
Alpha Prospect – Main Compartment - Risked
Gas Cap & Oil Leg
Gas Only 62 % COS
51 % Chance of Finding More
Than theEconomicMinimum
62% Chance to find any hydrocarbons51% Chance to find 100 MBOE 5% Chance to find 400 MBOE
100
Oil Only
Econ
omic
Min
imum
L 15 – Beyond Exploration
FWS 06Courtesy of ExxonMobil
Congratulations! A Huge Success
YOUR exploration well on the Alpha prospect
discovered an estimated 325 MBO
Alpha Prospect
Block7
Bonanza Basin
Discovery Well
Block8
SaltDiapir
L 15 – Beyond Exploration
0.0
0.2
0.4
0.6
0.8
1.0
0 100 200 300 400 500
Million Oil Equivalent Barrels
Alpha Prospect – Main Compartment - Risked
Gas Cap & Oil Leg
Gas Only 62 % COS
100
Oil OnlyEc
onom
ic M
inim
um
FWS 06
What’s Next?
Courtesy of ExxonMobil
• Exploration would drill one or two confirmation wells to verify there is enough HCs to make some money (Value > Costs)
• If results continue to be good, the FIELD would pass on to Development or Production people
SuccessUneconomic
Drill Wildcats
AssessProspects
ConfirmationWell
SuccessInterpret
Seismic Data
ProcessSeismic Data
AcquireSeismic Data
CapturePrime Areas
Identify Opportunities
To DevelopmentOr Production
L 15 – Beyond Exploration
FWS 06Courtesy of ExxonMobil
Delineation Well
Alpha Prospect
Block7
Bonanza Basin
Discovery Well
Block8
SaltDiapir
Delineation Well
6 Months later… A delineation well is completed to the NEAn OWC is found at 4500 m – the same depth as in the discovery wellThe porosity is slightly better – 26% versus 23% in the discovery well
The delineation well has confirmed enough oil to merit field development – EUR now set at 348 MBO
L 15 – Beyond Exploration
FWS 06Courtesy of ExxonMobil
G&G in Development
• Can we refine our picture of the distribution of oil at Alpha?• Is the reservoir a single unit, or is it segmented (separate regions to
drain)?• How many wells and where should they be drilled?• What sort of facilities (platform?) will we need?• How can we speed-up time to first oil?• What uncertainties remain?
• Exploration has drilled a discovery and a delineation well.• The ultimate recover for Alpha is estimated to be 338 MBO, which greatly exceeds the economic threshold of 100 MBO
Questions:
L 15 – Beyond Exploration
FWS 06Courtesy of ExxonMobil
We Need More Detail
Reservoir Mapat the end ofExploration
Reservoir Mapat the end ofDevelopment
L 15 – Beyond Exploration
FWS 06Courtesy of ExxonMobil
Some Questions …
#4
#3
#2
#1
Why did they drill well #3?
Why?Where would you place well #5?
Why did they drill well #4?
L 15 – Beyond Exploration
FWS 06Courtesy of ExxonMobil
Data for Development
Data Used for Exploration Data Reprocessed orReshot for Development
And Production
We may need better quality data to address development needs
L 15 – Beyond Exploration
FWS 06Courtesy of ExxonMobil
G&G in Production
• How should we manage the field so as to maximize our investments?• Can we monitor how oil is being swept out of the reservoir?• What about injection wells and enhanced recovery?• Is there more oil in the vicinity – either at deeper depths or in nearby traps?• Can we build a computer model of the field that matches existing production
data? If so, we can test future recovery with different drilling scenarios.
• Production has begun at Alpha.• The initial production rates are as expected.
Questions:
L 15 – Beyond Exploration
FWS 06Courtesy of ExxonMobil
Reservoir SimulationGeologic Model
Reservoir Simulation
Oil
Prod
ucti
on
Production Time
HISTORY MATCH
L 15 – Beyond Exploration
Actual in Blue
Modeled in Red
FWS 06Courtesy of ExxonMobil
The Value of G&G to an Oil Company
• G&G work is done to add HC reserves (volumes) – New discoveries– More from discovered producing zones– Additional producing zones
• Get the most reserves at the lowest cost– Invest in the right basins– Drill in the optimum locations– Correctly assess what can be recovered– Avoid unnecessary wells
L 15 – Beyond Exploration
FWS 06Courtesy of ExxonMobil
Let’s Fast Forward a Number of Years
• The Alpha field has been producing for 5 years
• We want to maximize production
L 15 – Beyond Exploration
FWS 06Courtesy of ExxonMobil
An integration of all geologic, geophysical, petrophysical and interpreted or conceptual information about a reservoir into a single 3D numerical description of that reservoir
Structural Interpretation
Stratigraphic Interpretation
Petrophysical Interpretation
Geophysical Interpretation
A Geologic Model
L 15 – Beyond Exploration
FWS 06Courtesy of ExxonMobil
Each cell can be populated with rock & fluid Properties:
– Facies– Porosity– Permeability– Fluid Saturation– Etc.
1m
75 m
Perm 250 mD
Sand
Shale
Perm0.1 mD
50 m
A Geologic Model
L 15 – Beyond Exploration
FWS 06Courtesy of ExxonMobil
How do we use this information?
• Field development planning• Field production optimization• Reservoir surveillance
Using a Simulation
HistoryO
il R
ate
Time
Prediction
Oil
Rat
eTime
HistoryO
il R
ate
Time
HistoryO
il R
ate
Time
HistoryO
il R
ate
Time
Oil
Rat
e
Time
Prediction
Oil
Rat
eTime
Prediction
Oil
Rat
eTime
Oil
Rat
eTimeTime (yrs)
Oil
Rate
Time (yrs)
Oil
Rate
HistoryO
il R
ate
Time
Prediction
Oil
Rat
e
Time
HistoryO
il R
ate
Time
HistoryO
il R
ate
Time
HistoryO
il R
ate
Time
Oil
Rat
e
Time
Prediction
Oil
Rat
e
Time
Prediction
Oil
Rat
e
Time
Oil
Rat
e
Time
Base CaseEOR
Infill Drilling Actual Modeled
L 15 – Beyond Exploration
FWS 06Courtesy of ExxonMobil
In Summary
• The O&G Industry needs top-notch scientists and engineers to work on a vast array of problems
• The assignments are challenging, fast-paced, and multi-disciplined
• Often your work is tested in the matter of months
• Great Ideas + Good Science -> Success
L 15 – Beyond Exploration