Intelligent section mill, method, and system

Patent metadata

Field	Value
Publication number	US-11840898-B2
Application number	US-202117557974-A
Country	US
Kind code	B2
Filing date	Dec 21, 2021
Priority date	Dec 21, 2021
Publication date	Dec 12, 2023
Grant date	Dec 12, 2023

Abstract

A section mill including a housing, a cutter pivotally connected to the housing, a drive piston operably connected to the cutter to radially expand or retract the cutter depending upon longitudinal position of the drive piston relative to the housing, and a limit configuration in operable contact with the drive piston to limit drive piston stroke responsive to hydraulic pressure on the drive piston. A method for cutting casing including determining condition of a structure radially outward of a casing to be cut, selecting an amount of expansion of a cutter based upon the determining, and cutting the casing. A borehole system including a borehole in a subsurface formation, a string in the borehole, and a section mill as in any prior embodiment disposed in the borehole.

First claim

What is claimed is:

1. A section mill comprising:
a housing;
a cutter pivotally connected to the housing;
a drive piston operably connected to the cutter to radially expand or retract the cutter depending upon longitudinal position of the drive piston relative to the housing; and
a limit configuration including a pushblock in operable contact with the drive piston to limit drive piston stroke responsive to hydraulic pressure on the drive piston, wherein the pushblock contacts a shuttle dog that is in turn in contact with the drive piston and limits movement of the drive piston based upon shuttle dog position.

2. The mill as claimed in claim 1 wherein the limit configuration comprises an electric motor and a driver.

3. The mill as claimed in claim 2 wherein the driver is a lead screw and follower.

4. The mill as claimed in claim 1 wherein the pushblock has a plurality of steps thereon.

5. The mill as claimed in claim 1 wherein the drive piston includes a plurality of lands selectively interactive with the shuttle dog.

6. The mill as claimed in claim 1 wherein the mill includes a sensory apparatus to sense condition of structure radially outwardly of a casing to be cut.

7. The mill as claimed in claim 6 wherein the sensory apparatus is an acoustic sensor.

8. The mill as claimed in claim 1 wherein the mill employs log data to position the limit configuration.

9. A method for cutting casing comprising:
determining condition of a structure radially outward of a casing to be cut;
selecting an amount of expansion of a cutter based upon the determining, wherein the selecting includes limiting an actuation stroke to limit radial expansion of the cutter, and wherein the limiting is running an electric motor to move a pushblock mechanically connected to a drive piston that physically limits movement of the drive piston; and
cutting the casing.

10. The method as claimed in claim 9 wherein the determining is by reading a log.

11. The method as claimed in claim 9 wherein the determining is by sensing structure radially outside of the casing to be cut.

12. The method as claimed in claim 9 wherein the selecting includes communicating a signal to a limit configuration that limits the expansion of the cutter.

13. The method as claimed in claim 12 wherein the communicating is from a controller local to the cutter.

14. A borehole system comprising:
a borehole in a subsurface formation;
a string in the borehole; and
a section mill as claimed in claim 1 disposed in the borehole.

15. The borehole system as claimed in claim 14 further including a controller in communication with the limit configuration.

16. The borehole system as claimed in claim 15 wherein the controller is disposed in the same housing as the limit configuration.

17. A section mill comprising:
a housing;
a cutter pivotally connected to the housing;
a drive piston operably connected to the cutter to radially expand or retract the cutter depending upon longitudinal position of the drive piston relative to the housing; and
a limit configuration in operable contact with the drive piston to limit drive piston stroke responsive to hydraulic pressure on the drive piston, wherein the mill employs log data to position the limit configuration.

18. A method for cutting casing comprising:
determining condition of a structure radially outward of a casing to be cut;
selecting an amount of expansion of a cutter based upon the determining, wherein the selecting includes communicating a signal to a limit configuration that limits the expansion of the cutter; and
cutting the casing.

Assignees

• Nguyen Tuan
• Meador Charles
• Baker Hughes Oilfield Operations Llc

Inventors

• Nguyen Tuan
• Meador Charles

Classifications

• E21B29/005 Primary

  with a radially-expansible cutter rotating inside the pipe, e.g. for cutting an annular window · CPC title

• E21B47/01

  Devices for supporting measuring instruments on drill bits, pipes, rods or wirelines; Protecting measuring instruments in boreholes against heat, shock, pressure or the like · CPC title

• E21B10/322

  cutter shifted by fluid pressure (E21B10/345 takes precedence) · CPC title