Example Casing Centralisers Programme

Hole Size, in

Casing Size, in

Number of Centralizers

Shoe Track Design

Remarks

26

20

2

1 centralizer over a stop collar on the shoe joint

• Use a B&W self fill shoe
• Install the DOS B&W lock down collar above the shoe
• Install one rigid centralizer inside the 30” shoe

17 ½

13 3/8

10

2 joint shoe track

• Use conventional shoe and float
• Install one centralizer over a stop collar on each of the first six joints above the shoe track
• Install one spring centralizer inside the 20” shoe
• Install one centralizer 60 feet below hanger

12 ¼

9 5/8

10 (minimum)

2 joint shoe track

• Use conventional shoe and float
• Install one centralizer over a stop collar on each of the first six joints above the shoe track
• install one centralizer on each joint over the full extent of hydrocarbon zones in open hole (logs will dictate extent of zone(s))
• Install one spring centralizer inside the 13 3/8” shoe
• Install one centralizer 60 feet below hanger

8 ½

7

10 (minimum)

3 joint shoe track

• Use conventional shoe and float
• Install one centralizer over a stop collar on every joint in the open hole and up to 500 ft inside the previous shoe

Casing

Bow

Angle of Hole Section

Size, in

Type

Less than 20^o

20^o to 45^o

Over 45^o

Flexible Centralizers

20”

ST-V

2 on the shoe joint

13 3/8”

ST-V-S

• 1 per 3 joints
• 1 per joint for the bottom 5 joints
• 1 per joint in the BU section.
• 1 per 2 joints
• 1 per joint for the bottom 10 joints
• 1 per joint in the BU section.
• 1 per joint

9 5/8”

ST-111-S

sd

• 1 per joint
• 1 per joint
• 2 per joint for the bottom 500ft

If this casing (or any other casing) is set below a productive zone, ensure that at least one flexible centralizer per joint is used across the reservoir

7”

ST-1-S (CT)

2 per joint in open hole

Rigid Centralizers

20”

PO X

At 40ft intervals from 30” shoe to surface

13 3/8”

PO IX

1 inside 20” shoe and 1 at one joint below hanger

9 5/8” to 10 ¾”

PO V

1at one joint below hanger

5” to 7”

PO I

1 per joint in the liner lap