000707 cberto el tordillo field
TRANSCRIPT
-
7/29/2019 000707 CBerto El Tordillo Field
1/68
-
7/29/2019 000707 CBerto El Tordillo Field
2/68
Outline
El Tordillo Field Description.
Area Central Norte Waterflood Project Description.
Data Acquisition and Preparation.
Production and Injection Data Analysis.
Integration of Results. Conclusions and Recommendations
-
7/29/2019 000707 CBerto El Tordillo Field
3/68
Objectives
To present a description of El Tordillo Field and the AreaCentral Norte waterflood project.
To show the preparation of the production and injectiondata.
To analyze and interpret the reallocated production data.
To demonstrate the various analyses.
To integrate the results (as maps and crossplots). To make recommendations for future waterflood projects inEl Tordillo Field.
-
7/29/2019 000707 CBerto El Tordillo Field
4/68
El Tordillo FieldEl Tordillo Field islocated in The SanJorge Basin, Patagonia(Argentina)
COMODORO
RIVADAVIA
ARGENTINA
71 70 69 68 67 66
71 6970 68 67 66
ATLANTIC
OCEA
DESEADO MASSIF
SOMOCURA MASSIF44
45
46
47
44
45
47
0 30
MILES
CHILE
NORTH-WESTERN
AREA
NORTHCENTRAL
AREA
CENTRAL
BASIN
WESTERN
AREA
SOUTH
FLANK
SOUTH-
WESTERN
AREA
ANDEAN
BELT
OFFSHORE
COMODORO
RIVADAVIA
Area: 29000 Acres
El Tordillo Field isrecognized as one of
the major oil fields in
Argentina.
-
7/29/2019 000707 CBerto El Tordillo Field
5/68
El Tordillo FieldReservoir Data
Total numbers of wells 850
Production oil wells 420
Injection water wells 69
Average final depth 9,840 ft Area 29,000 acres
Cumulative oil (Aug. 1999) 189 MMSTB
OOIP 1,800 MMSTB
-
7/29/2019 000707 CBerto El Tordillo Field
6/68
Reservoir Description
El Tordillo Field reservoirconsists of acomplex of fluvial-dominated sandstonesequences comprised of multiple layers withdistinctive shale zones.
Sandstones bodies are concentrated ingroups, locally called complejos.
Normal faultsare the most common andmost important structures in the reservoir.
Trbol, Comodoro Rivadavia, Mina ElCarmenare principal producing formationsin the stratigraphic column in the reservoir.
-
7/29/2019 000707 CBerto El Tordillo Field
7/68
El Tordillo FieldWaterflood Performance
There are several producing regions within El Tordillo
Field with:
Excellent continuity of oil-bearing sands,
Sequence development, and A high cumulative oil recovery.
These three characteristics are sufficient to define El
Tordillo Field as feasible for waterflooding.
-
7/29/2019 000707 CBerto El Tordillo Field
8/68
Area Central Norte project (ACN) has an excellent secondary response.
0
200
400
600
800
1000
1200
1400
J
ul-91
O
ct-91
Ene-92
A
br-92
J
ul-92
O
ct-92
Ene-93
A
br-93
J
ul-93
O
ct-93
Ene-94
A
br-94
J
ul-94
O
ct-94
Ene-95
A
br-95
J
ul-95
O
ct-95
Ene-96
A
br-96
J
ul-96
O
ct-96
Ene-97
A
br-97
J
ul-97
O
ct-97
Ene-98
A
br-98
J
ul-98
O
ct-98
Ene-99
A
br-99
J
ul-99
MESES
CA
UDAL[m3/d]
T.SUR TN ACN LPE BLOQUE D ACNE LPS ACNSOM TSPROF.
Waterflood Oil Rate in ACN (Aug 99) = 2200 STB/D
El Tordillo FieldWaterflood Performance
-
7/29/2019 000707 CBerto El Tordillo Field
9/68
-
7/29/2019 000707 CBerto El Tordillo Field
10/68
Stratigraphic Cross Section A-A for ACN Project Area
MINA EL CARMEN FORMATION
S-667 S-678 S-537 S-691 S-694 S-637 S-624 S-572 S-634 S-632 S-631 S-682 S-782
EL TREBOL FORMATION
PATAGONIA FORMATION
SARMIENTO-RIO CHICO FORMATION
COMODORO RIVADAVIA FORMATION
SALAMANCA FORMATION
8141 ft
0 ft
1000 ft
2000 ft
3000 ft
4000 ft
5000 ft
6000 ft
7000 ft
8000 ft
10000 ft
9000 ft
0 ft 1300 ft 2600 ft 3900 ft 5200ft 6500 ft 7800 ft 9100 ft 10500 ft
8443 ft
8095 ft
8787 ft
7993 ft
8532 ft
8207 ft
8580 ft
8450 ft8532 ft 8472 ft 8561 ft 8521 ft
Dry Horizon (No production)
Gas, Oil, and Water production
Injection horizon
Gas production
Oil and Water production
Oil production
Converted water injection well
Project Area Cross-Sections
-
7/29/2019 000707 CBerto El Tordillo Field
11/68
Area Central Norte (Region Map)
Area Central Norte
-
7/29/2019 000707 CBerto El Tordillo Field
12/68
-
7/29/2019 000707 CBerto El Tordillo Field
13/68
-
7/29/2019 000707 CBerto El Tordillo Field
14/68
Reservoir Thickness Contour Plot (ft)ACN Study Region
El Tordillo FieldPatagonia, Argentina
-
7/29/2019 000707 CBerto El Tordillo Field
15/68
Data Preparation
Production Data
Injection Data
Static Reservoir Data
-
7/29/2019 000707 CBerto El Tordillo Field
16/68
Data PreparationProduction Data
The fact that the production data are commingledmay significantly affect our ability to analyze
and interpret the production for each well:
It is impossible to provide an analysis for eachindividual layer.
The production data is re-allocated in Area
Central Norte (ACN) zones: ComodoroRivadavia and Mina El Carmen formations
-
7/29/2019 000707 CBerto El Tordillo Field
17/68
-
7/29/2019 000707 CBerto El Tordillo Field
18/68
Data Preparation - Steps
Identify errors or anomalies in the production andinjection data.
Locate and annotate changes in the completionpractices.
Reinitialize the production data in time.
Reallocate the total production for each reservoirinterval.
-
7/29/2019 000707 CBerto El Tordillo Field
19/68
1.E+00
1.E+01
1.E+02
1.E+03
1962 1966 1970 1974 1978 1982 1986 1990 1994 1998
Data PreparationRe-allocation
OilProductionRates,
STB/
D
Date, year
ACNsands
Oil Production Non -ACNsands
Oil Production
Production Performance Plot for Well 516Comparison of Total Oil Rate and ACN Project Zones Oil Rate
-
7/29/2019 000707 CBerto El Tordillo Field
20/68
Data Preparation
Production Data
Injection Data
Static Reservoir Data
-
7/29/2019 000707 CBerto El Tordillo Field
21/68
Data PreparationInjection Data
Although the injection wells are injecting in a
multi-stage fashion (i.e., injection over several
layers simultaneously), the total injection per well
is used in the analysis because the oil productioncould not be identified sand by sand.
-
7/29/2019 000707 CBerto El Tordillo Field
22/68
-
7/29/2019 000707 CBerto El Tordillo Field
23/68
Data PreparationStatic Reservoir Data
To estimate the static reservoir pressure as a func-tion of date, we used the fluid level measured inswab tests (performed on individual sands (orgroups of sands)) during the productive life of each
well.
Although the pressure data show a poor correlationwith date, we believe that the data are reasonable,
and as such, we have used the average trend for ouranalysis.
-
7/29/2019 000707 CBerto El Tordillo Field
24/68
0
500
1000
1500
2000
2500
3000
1960 1965 1970 1975 1980 1985 1990 1995 2000
Data PreparationStatic Reservoir Data
Pressure (avg.) = 84426 - 41.8 * year
Datum : 7664 ft
StaticReservoirPressure,p
si
Date, year
Static Reservoir Pressure Assigned by DateEl Tordillo Field, ArgentinaACN Region
high
avg.
low
-
7/29/2019 000707 CBerto El Tordillo Field
25/68
-
7/29/2019 000707 CBerto El Tordillo Field
26/68
-
7/29/2019 000707 CBerto El Tordillo Field
27/68
1.E+00
1.E+01
1.E+02
1.E+03
1.E+04
1975 1979 1983 1987 1991 1995 1999
Production Performance Plot for Well S-677ACN Project - Blue, Junior, Brown Zones
ProductionRates,S
TB/D
Date, year
Workover(Aug.9
3)
PrimarySecondary
Oil
Water
Completion(Oct.7
6)
Workover(Jun.8
2)Trend #1
-
7/29/2019 000707 CBerto El Tordillo Field
28/68
Well S-677 (Oil)Match Trend #1
We note a good match of all the production data, for both the transientand boundary-dominated flow periods in trend #1.
-
7/29/2019 000707 CBerto El Tordillo Field
29/68
1.E+00
1.E+01
1.E+02
1.E+03
1.E+04
1975 1979 1983 1987 1991 1995 1999
Production Performance Plot for Well S-677ACN Project - Blue, Junior, Brown Zones
ProductionRates,S
TB/D
Date, year
Workover(Aug.9
3)
PrimarySecondary
Oil
Water
Completion(Oct.7
6)
Workover(Jun.8
2)Trend #2
-
7/29/2019 000707 CBerto El Tordillo Field
30/68
-
7/29/2019 000707 CBerto El Tordillo Field
31/68
1.E+00
1.E+01
1.E+02
1.E+03
1.E+04
1975 1979 1983 1987 1991 1995 1999
Production Performance Plot for Well S-677ACN Project - Blue, Junior, Brown Zones
ProductionRates,S
TB/D
Date, year
Workover(Aug.9
3)
PrimarySecondary
Oil
Water
Completion(Oct.7
6)
Workover(Jun.8
2)
Secondary Trend
-
7/29/2019 000707 CBerto El Tordillo Field
32/68
Well S-677 (Oil)Match Secondary Trend
We note a good match of all the production data in the boundary-domi-nated flow periods during the secondary production trend.
-
7/29/2019 000707 CBerto El Tordillo Field
33/68
-
7/29/2019 000707 CBerto El Tordillo Field
34/68
-
7/29/2019 000707 CBerto El Tordillo Field
35/68
Estimated Ultimate Recovery Analysis
qovs.Np (Semi-Empirical-Approach) (S-677)
This plotting approach is used when bottomhole pressure data
are not available.
SecondaryPerformance
Extrapolating thetrends in the
waterflood period
to qo=0, thesecondary
movable oil isobtained.
-
7/29/2019 000707 CBerto El Tordillo Field
36/68
EUR Analysis: ResultsWell S-677 (Oil)
Primary PerformanceNp,mov: 328.9 MSTB
Recovery factor: 6.0 %
Secondary Performance
Np,mov: 201.7 MSTB
Recovery factor: 3.68 %
Secondary/Primary Recovery Ratio = 0.613
-
7/29/2019 000707 CBerto El Tordillo Field
37/68
Data Result Using Decline Type Curves
Injection WellsAs for oil cases performed previously, the material balancetype curve analyses yield two types of results: flow andvolumetric parameters.
Reservoir properties Skin factor for near well damage or stimulation, s Effective permeability, kw
In-place fluid volumes Total system volume available for injection, W
Injectable water, Winj Injection area,A
-
7/29/2019 000707 CBerto El Tordillo Field
38/68
-
7/29/2019 000707 CBerto El Tordillo Field
39/68
1 . E + 0 1
1 . E + 0 2
1 . E + 0 3
1 . E + 0 4
1 . E + 0 5
1 . E + 0 6
9 4 01 9 5 01 96 0 1 97 0 1 9 8 0 1 9 9 0 1
0
5 0 0
1 ,0 0 0
1 ,5 0 0
2 ,0 0 0
2 ,5 0 0
3 ,0 0 0
3 ,5 0 0
4 ,0 0 0
4 ,5 0 0
5 ,0 0 0
5 ,5 0 0
6 ,0 0 0
Injection Performance Plot for Well S-638
ACN Project - Blue, Junior, Brown Zones
W
aterInjectionRates
,STB/D
Date, year
Workover(Oct.98)
Pwfqwi
Conversion(Oct.93)
Workover(Oct.95)
Workover(Apr.97)
Flow
ingBottomholePressure,psia
-
7/29/2019 000707 CBerto El Tordillo Field
40/68
-
7/29/2019 000707 CBerto El Tordillo Field
41/68
Results: Well S-638 (Injection Well)
The injection rate (and pressure) functions were plottedversus material balance time on the Fetkovich/McCraytype curve .The following results were obtained:
Volumetric PropertiesTotal system volume
available for injection, W= 42,040 MSTBW
Injection Area, A = 439.6 acres
Flow PropertiesPermeability, kw = 1.848 mdSkin factor, s = -6.498
-
7/29/2019 000707 CBerto El Tordillo Field
42/68
Estimated Injectable Water AnalysisS-638
We note a reasonably linear trend with sig-nificant data scatter. The extrapolation of
this trend yields Winj= 11.1 x 106 STBW
InjectionPerformance
By plotting theinjectivity index,(qwi/Dp), versus
cumulative waterinjection, we can
estimate theinjectable watervolume when
(qwi/Dp)=0.
(qwi/Dp) vs. Wi
-
7/29/2019 000707 CBerto El Tordillo Field
43/68
Integration of Results - Maps
The following maps are presented as a mechan-ism to integrate the results from our individualwell analyses:
Flow Capacity, khOriginal Oil-in-Place,OOIP
Primary and SecondaryEUR
Total Recovery Factor
Secondary/Primary Recovery Ratio.
-
7/29/2019 000707 CBerto El Tordillo Field
44/68
Flow Capacity (kh) Contour Map
OOIP
EUR(p)
-
7/29/2019 000707 CBerto El Tordillo Field
45/68
Original-Oil-in-Place (OOIP) Contour Map
kh
EUR(p)
-
7/29/2019 000707 CBerto El Tordillo Field
46/68
-
7/29/2019 000707 CBerto El Tordillo Field
47/68
SecondaryEUR - Contour Map
-
7/29/2019 000707 CBerto El Tordillo Field
48/68
-
7/29/2019 000707 CBerto El Tordillo Field
49/68
-
7/29/2019 000707 CBerto El Tordillo Field
50/68
Integration of Results - Crossplots
Crosplots are presented to estimate average values for theprimary and secondary recovery factors and secondary/primary recovery ratio:
EURPrimary vs. OOIP
EURSecondary vs. OOIP
EURSecondaryvs.EURPrimary
Log-log correlation plots were prepared as an attempt toobtain meaningful relations between the computed flowcapacity and the oil recovery versus initial oil rate in order
to estimate the performance of infill wells in the ACNRegion:
kh, OOIP,EURPrimary ,EURSecondaryvs. Oil Rates.
-
7/29/2019 000707 CBerto El Tordillo Field
51/68
-
7/29/2019 000707 CBerto El Tordillo Field
52/68
C l t S d EUR P i EUR
-
7/29/2019 000707 CBerto El Tordillo Field
53/68
Crossplot: SecondaryEUR versus PrimaryEUR
Comparison of Secondary Estimated Ultimate Recovery
Versus Primary Estimated Ultimate Recovery
El Tordillo Field, Argentina
(ACN Region- Zones : Blue, Junior, and Brown)
1.E+04
1.E+05
1.E+06
1.E+07
1.E+04 1.E+05 1.E+06 1.E+07
Estimated Ultimate Recovery (Primary), STB
EstimatedUltimateRecovery
(Secondary),S
TB
EUR Secondary = 0.47 EUR Primary
-
7/29/2019 000707 CBerto El Tordillo Field
54/68
Crossplot: OOIP versus Initial Oil Rate (q )
-
7/29/2019 000707 CBerto El Tordillo Field
55/68
Crossplot: OOIPversus Initial Oil Rate (qoi)Comparison of Oil-in-Place (OOIP) Computed from DeclineType Curve Analysis
Versus Initial Oil Rate
El Tordillo Field, Argentina
(ACN Region- Zones : Blue, Junior, and Brown)
1.E+05
1.E+06
1.E+07
1.E+08
1.E+01 1.E+02 1.E+03 1.E+04
Initial Oil Rate, STB/D
ComputedOil-in-P
lace,STB
OOIP(avg)
= 119017 q oi0.6681
Low
Avg
High
primary(q )
-
7/29/2019 000707 CBerto El Tordillo Field
56/68
(qoi)Comparison of Estimated Ultimate Recovery (Primary)
Versus Initial Oil Rate
El Tordillo Field, Argentina
(ACN Region- Zones : Blue, Junior, and Brown)
1.E+04
1.E+05
1.E+06
1.E+07
1.E+01 1.E+02 1.E+03 1.E+04
Initial Oil Rate, STB/D
EstimatedUltimateRecovery
(Primary),ST
B
EUR(primary)(avg)
= 25010 q oi0.5243
High
Avg
Low
-
7/29/2019 000707 CBerto El Tordillo Field
57/68
Integration of Results Time Dependency
-
7/29/2019 000707 CBerto El Tordillo Field
58/68
Integration of ResultsTime Dependency
-
7/29/2019 000707 CBerto El Tordillo Field
59/68
-
7/29/2019 000707 CBerto El Tordillo Field
60/68
-
7/29/2019 000707 CBerto El Tordillo Field
61/68
Integration of ResultsTime Dependency
We note that the previous comparisons do notshow any specific trends. The lack of any specifictime dependency of the results clearly confirms
that the reservoir is highly heterogeneous and
probably of a low, to very low permeability.
C l i
-
7/29/2019 000707 CBerto El Tordillo Field
62/68
Conclusions
The following conclusions are noted:
The guidelines to set the production and injection realloca-tion are well established an all of the necessary information/
data was identified and sorted.
The decline type curve and volumetric analyses yieldedacceptable estimates of original oil-in-place, as well as
primary and secondary movable oil.
The calculation of movable oil volume using the q versusNpplot yields acceptable results (unlesspwfvaries significantly).
-
7/29/2019 000707 CBerto El Tordillo Field
63/68
Conclusions (Cont.)
Integrating the results of this study, we identified areas with
favorable conditions for additional oil reserves. We believe
that a detailed analysis (on a well-by-well basis) of these
zones will support the drilling of new infill wells in the ACN
Region.
We observed relatively constant trends ofOOIPand primaryEUR versus completion date, which confirms that the reser-
voir is highly heterogeneous, is of low permeability, and
infill wells should improve overall recovery.
Crossplots of results developed in this study can be used aspredictive tools for estimating the recovery of infill wells of
the ACN Region.
-
7/29/2019 000707 CBerto El Tordillo Field
64/68
-
7/29/2019 000707 CBerto El Tordillo Field
65/68
-
7/29/2019 000707 CBerto El Tordillo Field
66/68
Ackno ledgments
-
7/29/2019 000707 CBerto El Tordillo Field
67/68
I would like to thankTecpetrol S.A for providing me the
opportunity and the financial support to pursue my Master ofEngineering degree at Texas A&M University.
I would also like to thank the following individuals for their
contributions to this work:
Dr. T.A. Blasingame , for serving as Committee Chairman,
and for his advise, support, and encouragement during this
investigation.
Dr. A. Datta-Gupta, Dr. R. Thompsen andDr. J. Watkins
for serving as Committee Members.
Acknowledgments
-
7/29/2019 000707 CBerto El Tordillo Field
68/68