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CHALLENGE Reduce drilling time to TD for a 3,800-m directional well in Estación Fernandez Oro field, Argentina. SOLUTION Improve 12¼-in rock bit hydraulics and redesign standard SHARC* PDC bit cutters to increase durability and ROP. RESULT Saved 4.06 days of rig time and USD 142,100 when compared with the best average from five wells in the area. Reduction in drilling time required In the Estación Fernandez Oro field in Argentina, Apache typically drills wells in two sections—12 ¼-in borehole to 600 m and 8 ½-in hole to TD at 3,800 m. All the wells are directional, with lateral displacement varying from 100 m to 500 m. The 12 ¼-in section is drilled with a roller cone drill bit. Three bit runs are usually required to drill the 8 ½-in section, which is particularly complex because of the wide range of formation types encountered: sandstone/claystone with conglomerates, limestone, sandstone, sandstone/claystone again, and more sandstone. Apache wanted to improve ROP in both sections, thus reducing the total drilling time. Hydraulics improved, new bit designed, and cutters updated For the 12 ¼-in section of well EFO 129, a hydraulics review of the roller cone bit resulted in changing the total flow area (TFA) to improve hydraulic horsepower per square inch (HSI) and impact force. A Smith Bits design team produced a new and more dynamically stable SHARC high- abrasion-resistance PDC drill bit MSi519 for the first run in the 8 ½-in section, with the goal of maximizing bit life. IDEAS* integrated drillbit design platform enabled the team to virtu- ally drill with a number of prototype designs, operating parameters, and BHA configurations before choosing the best combination. For the second run in this section ONYX II* premium PDC cutters were added to a field- proven, 8 ½-in MSi516 SHARC bit to reduce wear on the cutting structure and increase ROP. A third run was required to reach TD, due to a non-bit related trip. CASE STUDY Drill Bits Customized SHARC PDC and Rock Bit Save Apache 4 Days of Rig Time and USD 142,000 ROP improves 56% in 12 ¼-in section and 32% in 8 ½-in borehole The SHARC MSi516 with ONYX II cutters increased ROP by 32%.

Customized SHARC PDC and Rock Bit Save Apache 4 Days …/media/Files/smith/case_studies/sharc_argentina_cs.pdf · Argentina, Apache typically drills wells in ... abrasion-resistance

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Page 1: Customized SHARC PDC and Rock Bit Save Apache 4 Days …/media/Files/smith/case_studies/sharc_argentina_cs.pdf · Argentina, Apache typically drills wells in ... abrasion-resistance

ChallengeReduce drilling time to TD for a 3,800-m directional well in Estación Fernandez Oro field, Argentina.

SolutionImprove 12¼-in rock bit hydraulics and redesign standard SHARC* PDC bit cutters to increase durability and ROP.

ReSultSaved 4.06 days of rig time and USD 142,100 when compared with the best average from five wells in the area.

Reduction in drilling time requiredIn the Estación Fernandez Oro field in Argentina, Apache typically drills wells in two sections—12 ¼-in borehole to 600 m and 8 ½-in hole to TD at 3,800 m. All the wells are directional, with lateral displacement varying from 100 m to 500 m. The 12 ¼-in section is drilled with a roller cone drill bit. Three bit runs are usually required to drill the 8 ½-in section, which is particularly complex because of the wide range of formation types encountered: sandstone/claystone with conglomerates, limestone, sandstone, sandstone/claystone again, and more sandstone. Apache wanted to improve ROP in both sections, thus reducing the total drilling time.

hydraulics improved, new bit designed, and cutters updatedFor the 12 ¼-in section of well EFO 129, a hydraulics review of the roller cone bit resulted in changing the total flow area (TFA) to improve hydraulic horsepower per square inch (HSI) and impact force.

A Smith Bits design team produced a new and more dynamically stable SHARC high-abrasion-resistance PDC drill bit MSi519 for the first run in the 8 ½-in section, with the goal of maximizing bit life. IDEAS* integrated drillbit design platform enabled the team to virtu-ally drill with a number of prototype designs, operating parameters, and BHA configurations before choosing the best combination.

For the second run in this section ONYX II* premium PDC cutters were added to a field-proven, 8 ½-in MSi516 SHARC bit to reduce wear on the cutting structure and increase ROP. A third run was required to reach TD, due to a non-bit related trip.

CaSe Study

drill Bits

Customized ShaRC PdC and Rock Bit Save apache 4 days of Rig time and uSd 142,000ROP improves 56% in 12 ¼-in section and 32% in 8 ½-in borehole

The SHARC MSi516 with ONYX II cutters increased ROP by 32%.

Page 2: Customized SHARC PDC and Rock Bit Save Apache 4 Days …/media/Files/smith/case_studies/sharc_argentina_cs.pdf · Argentina, Apache typically drills wells in ... abrasion-resistance

Engineers used BHA data, directional profile, mud properties, and offset run information provided by Apache to analyze bit performance. They had several proprietary modeling and database tools at their disposal, including IDEAS integrated drillbit design platform, IDEAS platform anal-ysis project for vibration analysis, DBOS* drillbit optimization system for rock strength analysis, and DRS drilling record system, a collection of nearly 3 million bit runs.

Record RoP achieved and 4 days of rig time saved The 600-m, 12 ¼-in section was drilled in 35.5 h, representing a 56% improvement in ROP. The 3,211 m, 8 ½-in section was drilled in 294.75 h, which is 32% faster than the offset average. The SHARC bit with ONYX II cutters improved ROP in the 8 ½-in section by 40% compared with the best offset well over the same interval. Based on comparison with the average of the five best offset wells in the area, total drilling time was reduced by 4.06 days, with a savings of USD 142,100 for Apache, setting a new record for drilling performance in this field.

*Mark of SchlumbergerOther company, product, and service names are the properties of their respective owners.Copyright © 2012 Schlumberger. All rights reserved. 12-BT-0009

www.slb.com/ShaRC

CaSe Study: SHARC PDC drill bit increases ROP by 32%, saves USD 142,000

Estación Fernandez Oro wells drilled in 2011. The rock bit drilled the 12¼-in section in 35.5 h, which represents a 56% increase in ROP.

Estación Fernandez Oro wells drilled in 2011. Drilling the 8½-in section with ONYX II cutters saved 4 days of rig time.

530.8 514.8 565.5 498.3 572.3 427.5 669.3 523.0 395.5 541.8 450.3 363.0 385.8 294.8

5.25

6.35.7

6.4

5.6

7.5

4.9

6.3

8.2

5.5

7.2

8.88.3

10.9

0

2

4

6

8

10

12

0

200

400

600

800

1,000

1,200

Average2007-2008

Average2010

Other A Smith Bits Other B Smith Bits Other B Smith Bits Smith Bits Other B Smith Bits Smith Bits Smith Bits

ROP

[m/h

] and

Num

ber o

f Bit

Runs

Hour

s

Estación Fernandez Oro Wells drilled in 2011

8 1/2" - 8 3/4" Section

Drilling Hours ROP Runs

Drill

ing

time,

hDr

illin

g tim

e, h

ROP

(m/h

) and

num

ber o

f bit

runs

ROP,

m/h

Smith Bits Offset ROP Runs

49.83 46.0 41.3 50.3 54.5 53.8 51.8 45.0 62.5 56.5 52.3 61.8 69.3 35.5

19.95

13.1

14.8

12.111.1 11.2 11.7

13.4

9.710.8

11.5

9.78.8

16.9

0

5

10

15

20

25

0

10

20

30

40

50

60

70

80

Average2007-2008

Average2010

Other A Smith Bits Other B Smith Bits Other B Smith Bits Smith Bits Other B Smith Bits Smith Bits Smith Bits

ROP

[m/h

]

Hora

s de P

erfo

ració

n]

Estación Fernandez Oro 2011Sección de 12 1/4"

Drilling Hours ROP

Smith Bits Offset ROP

Smith Bits SHARC

Smith rock bit