The Internal Hydraulic Pipe Cutter TVG is designed to cut elements of drilling strings and oil-well tubings during repair and recovery works in the well.
First of all it is necessary to assemble the downhole motor and Internal Pipe Cutter. Set the hydraulic tubing anchor above the motor. It fixes body during operation and eliminates axial throw and turn under influence of counter torque.
It is forbidden to provide pressure at the downstream line while lowering the Pipe Cutter. It may lead to premature moving-out of cutters.
When Pipe Cutter reaches required depth, fix the weight of string via weight indicator. Create circulation with required working pressure. At the same time under influence of excess pressure slips of anchor are pressed to the well wall. The Pipe Cutter starts its operation.
Сirculation of drilling fluid through annular space between casing and tubing signalizes that the pipe was cut.
After finishing operations stop pressure feed in downstream line. As a result Pipe Cutter and hydraulic anchor come back to transport position.
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