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Rottmann 1
Field Examples of Fracturing
and Drainage
by Kurt Rottmann
• Goals
– Understand fracture patterns in the Mississippian
Osage
– Review older fracture identification logs
– Review fracture components to volumetric OOIP
calculations
– Recommendations on mapping the Mississippian
Osage
– Review drainage patterns with possible frac
implications
Paradoxes to Mississippian
Production
• Why do accumulations of oil and gas
appear to follow no distinct law of
gravitational separation?
• Do fracture systems connect the entire
Mississippian section to create a common
source of supply?
Harp (1965)
Rottmann 2
Woodford
Well #1 Well #2 Well #4
GAS
OIL
GAS
OIL
Regional Dip
IPFHigh GOR
IPFLow GOR
IPFHigh GOR
Hydrocarbon Separation Paradoxas seen in the NE Enid Field
Well #3
35047018220000BANKERDORF ROY A
1T22N R6W S1
C NW NW1,205
352OSGE
64,7401,920,4295/23/1962
60
00
61
00
62
00
63
00
64
00
65
00
HS=1
PETRA 5/2/2011 3:06:38 PM
Meramec
Osage
1st perf- 6350-6464 and treated
Ip 160 bbls/day 37.5 api oil, 20/64”
choke, ftp 100psi and gor of 532-1
2nd Perf 6150-98 and treated with
acid,
Ip 2,525 mcf/day, and 24 bbls of
54.5 api condensate, 26/64”
choke, ftp 1025 psi and gor of
105,000/1
Rottmann 3
35003001030001ENCIE MCCUNE
1T23N R10W S7
C NE SEH & H SUPPLY COMPANY
359MSSP
9,8681,387
4/12/19647,50020668
67
50
68
75
70
00
71
25
72
50
HS=1
PETRA 5/2/2011 2:55:34 PM
1961- Perf 6680-6759
90 bbls/day 38 api oil,
220 Mcf, ftp 100
1964 perf 7200-7280
206 bbls/day 38.2 api oil
68 bbls water
60
00
61
00
62
00
63
00
64
00
65
00
66
00
60
00
61
00
62
00
63
00
64
00
65
00
66
00
IPF High GOR>200,000/1
IPF Low GOR<15,000/1
Rottmann 4
40,139 bbls
4,628,594 mcf
7,182 oil
4,794,539 mcf
49,827 bbls
2,635,250 mcf
367,931 bbls
1,499,883 mcf
Lease prod121,678 bbls
1,633,861 mcf
Lease prod
Rottmann 5
Paradoxes to Mississippian
Production
• Why do accumulations of oil and gas
appear to follow no distinct law of
gravitational separation?
• Do fracture systems connect the entire
Mississippian section to create a common
source of supply?
Harp (1965)
Brittle rock
Ductile rock
Top MeramecTop Meramec
Top Osage
Top Osage
Top Woodford
Top Woodford
Fracture Orientation and Extent
Rottmann 6
35047010770000T23N R5W S21
C SE SW1,218
359MSSP
35047010800000T23N R5W S21
C SE SE1,220
359MPLM
35047211020000T23N R5W S22
C SE SW1,214
353MPMC
54,687575,977
10/17/196317,783
200,42712/30/1963
231,1364/28/1976
2481,062
60
00
61
00
62
00
63
00
64
00
65
00
66
00
60
00
61
00
62
00
63
00
64
00
65
00
66
00
60
00
61
00
62
00
63
00
64
00
65
00
HS=530
PETRA 4/29/2011 3:45:02 PM (3-26 hillsdalw.CSP)
Field Examples of Fracturing
and Drainage
by Kurt Rottmann
• Goals
– Understand fracture patterns in the Mississippian
Osage
– Review older fracture identification logs
– Review fracture components to volumetric OOIP
calculations
– Recommendations on mapping the Mississippian
Osage
– Review drainage patterns with possible frac
implications
Rottmann 7
Hilchie, 1982, Fig 16-5, Reprinted by
permission of Douglas W. Hilchie, Inc.
35003300750000MARVEL L RYEL
1T23N R11W S4
SE NEUNION TEXAS PETROLEUM CORPORATION
359MSSP
20,6795/7/1965
7,300120200
66
25
67
50
68
75
70
00
71
25
72
50
HS=1
PETRA 5/2/2011 3:01:40 PM
Possible
Fractures
GR SP Laterolog Caliper Interval
Transit Time
Delta T Amplitude Amplitude
Rottmann 8
35003001500000T23N R11W S2
C NE SWSHELL OIL CO
359MSSP
3/4/19647,4251060
65
00
66
25
67
50
68
75
70
00
71
25
72
50
73
75
HS=1
PETRA 4/29/2011 4:22:39 PM (3-36 fracture example.CSP)
SP Recip Short Cond
Induction Normal
GR SP Laterolog GR Acoustic 1” & 4” Max Compressional
Amplitude
Possible
Fractures
Field Examples of Fracturing
and Drainage
by Kurt Rottmann
• Goals
– Understand fracture patterns in the Mississippian
Osage
– Review older fracture identification logs
– Review fracture components to volumetric OOIP
calculations
– Recommendations on mapping the Mississippian
Osage
– Review drainage patterns with possible frac
implications
Rottmann 9
• “Density and neutron logs generally do not see fractures conclusively. The .5 to 1.5 % porosity increase is almost impossible to see on these logs unless the matrix porosity is very low and constant. Once in a while if the formation is badly fractured these logs will show an abnormally high porosity due to the “streaming” of the gamma rays and neutrons up toe fracture. This streaming phenomena has been noticed in surface test pits. The density log correction curve will sometimes pick up a fracture as an increase in correction. In any of these cases the identification is not conclusive.”
Hilchie, D.W., 1982
Volumetric Calculations
• 2% matrix porosity
• 30% water saturation
• 40 foot payzone
• 40 acre drainage
• FVF 1.25
• OOIP 139,023 BO
• 10% Rf ~14,000 BO
• 4% por w/ frac
• 30% water saturation
• 40 foot payzone
• 40 acre drainage
• FVF 1.25
• OOIP 278,046 BO
• 10% Rf ~ 29,000 BO
Rottmann 10
Field Examples of Fracturing
and Drainage
by Kurt Rottmann
• Goals
– Understand fracture patterns in the Mississippian
Osage
– Review older fracture identification logs
– Review fracture components to volumetric OOIP
calculations
– Recommendations on mapping the Mississippian
Osage
– Review drainage patterns with possible frac
implications
Proposed LocationIP 81 BO &652 MCFG
IP 84 BO &750 MCFG
IP 160 BO &11397 MCFG
IP 31 BO &225 MCFG
IP 90 BO &900 MCFG
IP 206 BO &4958 MCFG
1982
1964
1965
1965
1965Miss cum~1.5 BCF
19841984
1962
Rottmann 11
Hypothetical Porosity LogOf the Mississippian Osagean
SectionGamma Ray Porosity
Lower PorosityZone
Middle PorosityZone
Upper PorosityZone
ProposedLocation
Upper
Zone
Rottmann 12
ProposedLocation
Middle
Zone
ProposedLocation
Lower
Zone
Rottmann 13
ProposedLocation
Hypothetical Porosity LogOf the Mississippian Osagean
Section
FracturedZone
MinimumGrossPorosity
CompensatedZone
Mud CakeZone
CumulativeProduction40,000 BO +1.4 BCFG
Caliper Density Compensation
Rottmann 14
0´
1.0
1.0
1.0
1.0
0´0´
0´
0´0´
Rottmann 15
Field Examples of Fracturing
and Drainage
by Kurt Rottmann
• Goals
– Understand fracture patterns in the Mississippian
Osage
– Review older fracture identification logs
– Review fracture components to volumetric OOIP
calculations
– Recommendations on mapping the Mississippian
Osage
– Review drainage patterns with possible frac
implications
Proposed LocationIP 81 BO &652 MCFG
IP 84 BO &750 MCFG
IP 160 BO &11397 MCFG
IP 31 BO &225 MCFG
IP 90 BO &900 MCFG
IP 206 BO &4958 MCFG
1982
1964
1965
1965
1965Miss cum~1.5 BCF
19841984
1962
Rottmann 16
ProposedLocation
Natural FracturePattern
Rottmann 17
References
• Harp, L.J., 1965, Mississippian Trend, Garfield, Major and Alfalfa Counties, Oklahoma, The
Western Company, Oklahoma City, OK
• Hilchie, D.W., 1982, Applied Openhole Log Interpretation for Geologists and Engineers, Douglas
W. Hilchie, Inc, Golden Colorado, page 16-8
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