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A cutting tool that inserts into a tubular for cutting the tubular from within. The cutting tool includes a motor, a cutting head, permanent anchor between the motor and cutting head, an electronics portion, and a modular anchoring sub that can be between the motor and electronics portion or on the

A cutting tool that inserts into a tubular for cutting the tubular from within. The cutting tool includes a motor, a cutting head, permanent anchor between the motor and cutting head, an electronics portion, and a modular anchoring sub that can be between the motor and electronics portion or on the upper end of the cutting tool. The modular anchoring sub provides flexibility in where anchoring elements are positioned so that depending on the application, the modular anchoring sub can be positioned so that it provides its maximum anchoring force for stabilizing the cutting tool during use.

대표청구항 ▼

1. A cutting tool for severing a tubular comprising: motor section having a motor;a cutting head driven by the motor;an anchor section having members that selectively extend to and retract from engagement with the tubular;a modular anchoring sub selectively coupled to an end of the motor section dis

1. A cutting tool for severing a tubular comprising: motor section having a motor;a cutting head driven by the motor;an anchor section having members that selectively extend to and retract from engagement with the tubular;a modular anchoring sub selectively coupled to an end of the motor section distal from the anchor section and having elements that selectively extend to and retract from engagement with the tubular; andmodular connectors on opposing ends of the modular anchoring sub, so that when a controller sub is coupled to the cutting tool on a side of the motor distal from the anchor section, the modular anchoring sub is selectively interchangeable in a position between the motor section and the controller sub and a position on an end of the controller sub distal from the motor section. 2. The cutting tool of claim 1, wherein the modular connectors provide connectivity to a control line used for controlling the cutting tool. 3. the cutting tool of claim 1, further comprising a spacer sub disposed between the motor section and t he modular anchoring sub. 4. The cutting tool of claim 1, wherein the elements of the modular anchoring sub are axially spaced apart and independently moveable. 5. The cutting tool of claim 1, further comprising and umbilical disposed axially through the modular anchoring sub, wherein the umbilical comprises lines for conveying at least one of a control signal and power, and wherein the lines have opposing ends that connect to modular connectors on opposing ends of the modular anchoring sub, and that selectively disconnect so that the modular anchoring sub can connect to and umbilical in an additional section and on a side of the additional section distal from the motor, or connect to the umbilical in the additional section on a side of the additional section proximal the motor section. 6. The cutting too of claim 5, wherein when the modular anchoring sub is on the end of the additional section distal from the motor section, the modular connector on the end of the modular anchoring sub distal from the additional section couples to the control line for controlling the cutting tool. 7. The cutting tool of claim 1, wherein the anchoring section is disposed between the motor section and cutting head. 8. A method of severing a tubular comprising: providing a cutting tool comprising a motor section having a motor, a cutting head having a cutting blade; and anchor section affixed between the motor section and cutting head and having anchoring members; a modular anchoring sub having anchoring elements; and a controller section;coupling the modular anchoring sub with an end of the controller section distal from the motor section and so that the modular anchoring sub defines a terminal end of the cutting tool that is distal from cutting blade;decoupling the modular anchoring sub from the controller section, switching positions of the modular anchoring sub and the controller section, so that the modular anchoring sub is between the controller section and the motor section; anddisposing the cutting tool into the tubular and driving the cutting blade with the motor to sever the tubular, and wherein the modular anchoring sub and controller section each have an umbilical extending axially therethrough that comprises a line for conveying a signal, a line for conveying power, and connectors on opposing ends o the lines, and wherein the step of coupling the modular anchoring sub on a terminal end of the cutting tool includes engaging connectors in the modular anchoring sub with connectors in the controller section. 9. The method of claim 8, further comprising increasing the distance between the modular anchoring sub and the anchoring members by adding a spacer sub in the cutting tool between the modular anchoring sub and the motor section. 10. The method of claim 8, wherein the cutting tool is disposed in a horizontal wellbore and wherein the anchoring members and the anchoring elements support and centralize the cutting tool within the tubular. 11. The method of claim 8, wherein the modular anchoring sub comprises a first modular anchoring sub and is between the motor section and the controller section, the method further comprising coupling a second modular anchoring on an end of the controller section distal from the first modular anchoring sub. 12. A method of severing a tubular at a wellbore site comprising: providing a cutting tool to the site that comprises a motor section having a motor, a cutting head having a cutting blade; an anchor section affixed between the motor section and cutting head and having anchoring members; a modular anchoring sub having anchoring elements, and a controller section coupled to an end of the motor section distal from the anchor section;estimating an anchoring force exerted onto the cutting tool by the modular anchoring sub for positions comprising between the motor section and controller section and on an end of the controller section distal from the motor section;increasing a distance between the anchor section and the modular anchoring sub by adding a spacer sub between the modular anchoring sub and the anchor section;inserting the cutting, tool into a location in the tubular so that a bend in the tubular is between the modular anchoring sub and the cutting blade;centralizing an end of the cutting tool having the cutting blade in the tubular and asymmetrically positioning the modular anchoring sub in the tubular; andsevering the tubular by rotatingly engaging the tubular with the cutting blade. 13. The method of claim 12, further comprising providing communication through the modular anchoring sub between the motor section and a conveyance means for deploying and controlling the cutting tool.