TAMING THE SPRABERRY

Goke DabiriTexas A&M University

Pioneer Natural Resources

Background Information

Glasscock Co

Reagan CoUpton Co

Midland Co

Martin Co Borden Co

O'Daniel O'Daniel O'Brian

O'DanielO'Daniel Brunson Boone

O'BrianPowellFloyd

35

33

B-1

D-1

C-1

5

7

12

9 13

10

63

9

8 12

7

A-1

B-1

1

A-5

BooneE-1 A-6

A-3 A-7

32

12

8W

34

6

1

24

31

36

26

D-1

19

13

30G-1

C-2E-1

BooneA-1

D-1 A-1

F-1

C-1

C-1

1

D-1

3 2

47

25

29

37

46

C-1

28

45

38

39

40

48

14

41

43

49

50

44

429w 4w

11w 17 ET3

w7

23

Floyd 7w

Problem Definition

<10% Oil Recovery in 50 years!Complex fracture systemHuge Kfx/Kfy Ratio (17,000md/100md !)Conventional Waterfloding???

Field Production Indicator…….

0

50

100

150

200

250

BOPD (7 On-Trend Wells) BOPD (23 Off-Trend Wells)

Spraberry FractureSystem Schematic

Average fracture spacing3.17 ft (N42E)

Average fracture spacing1.62 and 3.8 ft (N32E and N80E)

Pay zone, 5USiltstone,

Vshl<15%,f>7%

Pay zone,1USiltstone,

Vshl<15%,f>7%

Non-pay zone,2U,3U, and 4U

Siltstone+Dolomite,

Vshl<15%, f <7%

Sand layer1U (10 ft)

Sand layer5U (15 ft)

Shale layer(140 ft)

Grid --> 70 x 80 x 3(*2) Grid orientation? PVT and petrophysical data Dual porosity Geological input Oil production constraint Injectors, producers...

0.25miles

Simulation Model Setup

23 1C 21

3325i

29

27

7w

DA1

17ET3

ET2

ET1

20w

29w 4w

14w

11w

FLOYD 7w

23 1C 21

33 25i

29

27

7w

DA117

ET3

ET2

ET1

20w

29w 4w

14W

11w

FLOYD 7w

7w

P1P2

P3

P4

P5

P7

P6

40 Acres Spacing

7w

P1P2

P3

P4

P5

P7

P6

80 Acres Spacing

7w

P1P2

P3

P4

P5

P7

P6

120 Acres Spacing

Conclusions………..

Fracture enhancement is preferred to grid orientation

It is important to determine the angles and distances of the Injectors and Producers Relative to the Predominant Fractures

Gracias !

BACKUP SLIDES ARE AFTER THIS

23 1C21

3325i

29

27

7w

DA1

17ET3

ET2

ET1

No Fracture Enhancement

Fracture Enhancement

Field History

23 1C 21

33 25i

29

27

7w

DA117

ET3

ET2

ET1

20w

29w 4w

14W

11w

FLOYD 7w

No Fracture Enhancement

Fracture Enhancement

Field History

Refined Model

23 1C 21

33 25i

29

27

7w

DA117

ET3

ET2

ET1

20w

29w 4w

14W

11w

FLOYD 7w