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