Overview

Document Type
Case Study
Date Published
July 1, 2015
Region
Norwegian North Sea

Additional information

Environment
Offshore
System Type
Planned
System Size
ESET
Values Added
Cost Efficiency, Improved Cementation, Maximized Production Capability
Casing Size
10-3/4 in.
Expandable Size
8-5/8 in.
Liner Length
1,881ft
Attachment
Next Study

Case Study

Challenge

A major operator in the Norwegian North Sea anticipated problems while drilling a12-¼ x 13-½ in. hole section which required setting 10-¾ in. casing early. This left a section of overburden exposed above the reservoir. Conventional practice would utilize a 7-5/8 in. liner to isolate the overburden and 5-½ in. pipe across the reservoir, greatly reducing production capability and return on investment (ROI).

Added Value

The 8-5/8 in. ESET HP System isolated the overburden section, providing an 8-1/2 in. drift ID. This enabled the reservoir to be drilled and completed with a 7-5/8 in. liner, maximizing production capability.

The 8-5/8 in. ESET HP System provided:

• Rotational capability that enabled the system to reach the planned setting depth and improved cementation of the liner.
• Solid Blade centralization that reduced drag while running the liner and optimized cementation.

• Bottom up expansion ensured the entire overburden was isolated.

• Increased yield and collapse values (compared to standard SET systems).