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Set of tools type OT4 for cutting a rat hole in casing

APPLICATION:

 

The set is designed to mill a rat hole in casing and side tracking. A rig rotor or a power swiwel is used as a gear. 

 

CONSTRUCTION:

 

A set consisits of:

1. Whipstock with hydraulic packer is designed for deviation the cutting tools from axis of the main well bore during cutting a rat hole in casing. The whipstock construction allows, when it's necessary , to pull the whipstock out of the hole.

2. Starting mill is designed to cut a rat hole in casing and side tracking.

3. Watermelon mill is designed to widen walls in a cut rat hole. 

4. String  mill  is designed  to widen and calibrate walls in cut rat hole.

5. Flexible sub is designed to connect a watermelon mill with a string mill and provide reduction of set. Reduces inflexibility.

6. Retrieving hook is designed to pull the whipstock out of hole. 

 

Features of the set:

- Setting on hydraulic packer;

- Set with three mills;

- Orientation with GYRO or MWD;

- The mechanical anchor provides max tightness of the whipstock to the casing wall;

- Retrievable and Non-retrievable variants are avaiable.