Method and apparatus for jet-fluid abrasive cutting

Apparatus for cutting shape or window profile(s) through casing, cement and formation rock using abrasive-jet-fluid flowing through a jet-nozzle, the apparatus comprising:

• a profile generation system which simultaneously directs the movements of a tubing string in a vertical axis and 360 degree horizontal rotary axis via servo drives to allow cutting of at least one of a casing, cement or formation rock, in any programmed shape or window profile(s);
• a jetting shoe coupled to the tubing string;
• a magnetic proximity switch coupled to the jetting shoe;
• coiled fluid tubing for delivering a coherent high pressure abrasive-jet-fluid through a single tube;
• a jet-nozzle for ejecting an abrasive-jet-fluid under high pressure from the jetting-shoe;
• and
• the profile generation system is capable of:
• storing shape or window profile(s) templates for cutting a shape or window profile in at least one of a casing;
• accepting user input to program new shape or window profile(s) based on user criteria;
• controlling the profile generation servo drives;
• controlling an abrasive mixture percent to total fluid volume;
• controlling the pressure and flow rates of a high pressure pump and drive;
• controlling feed and speed of a coiled fluid tubing unit and a coiled tubing injector head,
• controlling the simultaneous vertical and horizontal directional movements of the coiled tubing,
• scanning the cut shape or window profile(s) after the casing, cement or rock formation has been cut.