Schlumberger

Mechanical Anchor Casing Exit System

Overview Library

Economical milling, casing exit, and single-trip sidetracking

The Schlumberger mechanical anchor casing exit systems provide casing exits and sidetracking in a single trip. Designed for high-efficiency operations, they reduce trips, milling time, and rig time for exiting from an existing wellbore. 

Anchor setting 

The casing exit system base is a mechanically set, single-grip anchor that is run to the desired depth on the drillpipe or workstring and connected to the whipstock slide and bi-mill assembly by a shear bolt. Once depth has been reached, the whipstock face is aligned through gyro or other directional measurement tools, and the anchor is deployed by setting weight on the bottom of the hole, cement plug, bridge plug, or liner top. 

Milling

Compression enables setting the anchor to lock firmly into place within the casing string, and weight is applied to shear the lead mill from the top of the whipstock slide. For short ratholes, whipstock anchor setting, casing exit, and drilling are accomplished in a single trip. 

Casing exits 

Once free from the whipstock slide, the bi-mill provides a casing exit and smooth window to facilitate sidetracks and reentries. The spacing of the lead and follow mill, along with the profile of the whipstock slide top, provide a full-gauge window above the top of the whipstock, allowing minimized dogleg across the casing exit and reducing the effects on subsequent tubulars and completion strings.

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