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A bottom hole assembly for drilling a cavity including a chassis configured to rotate is provided. The chassis may include a conduit, a circuit, a pressure transfer device, a plurality of pistons, a plurality of valves, and a plurality of cutters. The conduit may accept a first flow of a primary flu

A bottom hole assembly for drilling a cavity including a chassis configured to rotate is provided. The chassis may include a conduit, a circuit, a pressure transfer device, a plurality of pistons, a plurality of valves, and a plurality of cutters. The conduit may accept a first flow of a primary fluid. The circuit may have a second flow of a secondary fluid. The pressure transfer device may be configured to transfer pressure between the flows. The pistons may be operably coupled with the circuit, and each piston may be configured to move based at least in part on a pressure of the circuit at that piston, with the valves possibly configured to control a pressure of the circuit at each piston. Each cutter may be coupled with one of the pistons.

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What is claimed is: 1. A bottom hole assembly for drilling a cavity, wherein the bottom hole assembly comprises: a chassis configured to rotate, wherein the chassis comprises: a conduit configured to accept a first flow of a primary fluid; a substantially closed loop circuit having a second flow of

What is claimed is: 1. A bottom hole assembly for drilling a cavity, wherein the bottom hole assembly comprises: a chassis configured to rotate, wherein the chassis comprises: a conduit configured to accept a first flow of a primary fluid; a substantially closed loop circuit having a second flow of a secondary fluid; a pressure transfer device configured to transfer pressure between the first flow of the primary fluid and the second flow of the secondary fluid; a plurality of pistons operably coupled with the substantially closed loop circuit, wherein the plurality of pistons comprises a first piston, and the first piston is configured to move based at least in part on a pressure of the circuit at the first piston; a plurality of valves operably coupled with the substantially closed loop circuit, wherein the plurality of valves is configured to control a pressure of the substantially closed loop circuit at each of the plurality of pistons and wherein each piston has an inlet and outlet valve of the plurality of valves; a plurality of cutters in proximity to an outer surface of the chassis, wherein each of the plurality of cutters is coupled with one of the plurality of pistons; and wherein the second flow of the secondary fluid comprises a smart fluid. 2. The bottom hole assembly for drilling a cavity of claim 1, wherein at least a portion of the plurality of valves are controlled via wireline to a surface of a medium. 3. The bottom hole assembly for drilling a cavity of claim 1, wherein the pressure transfer device comprises a fluid driven pump, wherein the fluid driven pump is powered by the first flow of the primary fluid and pressurizes the second flow of the secondary fluid. 4. The bottom hole assembly for drilling a cavity of claim 3, wherein the fluid driven pump comprises a turbine, wherein the turbine is: operably coupled with the conduit; operably coupled with the substantially closed loop circuit; configured to be rotated by the first flow of the primary fluid; and configured to pressurize the second flow of the secondary fluid. 5. The bottom hole assembly for drilling a cavity of claim 1, wherein: the second flow of the secondary fluid comprises a magnetorheological fluid; and the plurality of valves comprise a plurality of magnetic field or electric field generators. 6. The bottom hole assembly for drilling a cavity of claim 1, wherein the chassis being configured to rotate comprises the chassis being configured to rotate once during a particular time period, and wherein the each of the plurality of pistons is configured to be moved at least once during the particular time period. 7. The bottom hole assembly for drilling a cavity of claim 1, wherein the bottom hole assembly further comprises a control system, and wherein the plurality of valves being configured to control a pressure of the substantially closed loop circuit at each of the plurality of pistons comprises the control system controlling the plurality of valves such that each of the plurality of pistons is extended and retracted once during a single rotation of the chassis. 8. The bottom hole assembly for drilling a cavity of claim 1, wherein the bottom hole assembly further comprises a control system, and wherein the control system is configured to: receive data representing a rotational speed of the chassis; and control the valves based at least in part on the rotational speed of the chassis. 9. The bottom hole assembly for drilling a cavity of claim 1, wherein the first flow of the primary fluid is a mud flow. 10. The bottom hole assembly for drilling a cavity of claim 1, wherein the bottom hole assembly further comprises a control system, and wherein the control system is configured to: receive data representing the position of the first piston; and determine an amount of wear of a cutter coupled with the first piston based at least in part on the position of the first piston. 11. The bottom hole assembly for drilling a cavity of claim 1, wherein the bottom hole assembly further comprises a control system, and wherein the control system is configured to: transmit a first control signal to at least one of the plurality of valves in order to control a pressure of the substantially closed loop circuit at the first piston; receive data representing a change in a position of the first piston; determine a delay time between transmitting the first control signal and the change in position of the first piston; and transmit a second control signal at a later time, wherein the later time is based at least in part on the delay time. 12. The bottom hole assembly of claim 1 wherein extension and/or retraction of the plurality of cutters is achieved by opening or closing the inlet and outlet valve. 13. A method for drilling a cavity in a medium, wherein the method comprises: providing a chassis having a plurality of cutters, wherein: each of the plurality of cutters are extendable from, and retractable to, the chassis; and the plurality of cutters comprises a first cutter; rotating the chassis in the medium, wherein the plurality of extendable and retractable cutters remove a portion of the medium to at least partially define the cavity; extending the first cutter from the chassis during the rotation of the chassis in the medium; wherein extending the first cutter from the chassis during rotation of the chassis in the medium comprises: providing a substantially closed loop circuit having a second flow of a secondary fluid; pressurizing the second flow of a secondary fluid; providing a plurality of pistons operably coupled with the substantially closed loop circuit, wherein: the plurality of pistons comprises a first piston; the first piston is configured to move based at least in part on a pressure of the substantially closed loop circuit at the first piston; and the first cutter is coupled with the first piston; providing a plurality of valves operably coupled with the substantially closed loop circuit, wherein the plurality of valves is configured to control a pressure of the circuit at each of the plurality of pistons and wherein each piston has an inlet and outlet valve of the plurality of valves; controlling the plurality of valves to move the first piston; and wherein the second flow of the secondary fluid comprises a smart fluid. 14. The method for drilling a cavity in a medium of claim 13, wherein: the plurality of cutters further comprises a second cutter; extending the first cutter from the chassis during the rotation of the chassis in the medium comprises extending the first cutter from the chassis when the first cutter is substantially at a particular absolute radial position; and the method further comprises: retracting the first cutter to the chassis when the first cutter is not substantially at the particular absolute radial position; extending the second cutter from the chassis when the second cutter is substantially at the particular absolute radial position; and retracting the second cutter to the chassis when the second cutter is not substantially at the particular absolute radial position. 15. The method for drilling a cavity in a medium of claim 14, wherein pressuring the second flow of a secondary fluid comprises: providing a first flow of the primary fluid to the chassis; and transferring pressure from the first flow of the primary fluid to the second flow of a secondary fluid. 16. The method for drilling a cavity in a medium of claim 14, wherein extending the first cutter during the rotation of the chassis in the medium comprises sending at least one control signal from a control system to the plurality of valves, and wherein the method further comprises: receiving data representing a change in a position of the first cutter; determining a delay time between transmitting the at least one control signal and the change in position of the first cutter; and transmitting at least one control signal at a later time, wherein the later time is based at least in part on the delay time. 17. The method for drilling a cavity in a medium of claim 13, wherein the method further comprises: receiving data representing the position of the first cutter; and determining an amount of wear of the first cutter based at least in part on the data representing the position of the first cutter. 18. A system for drilling a cavity in a medium, wherein the system comprises: a plurality of cutters; a first means for rotating the plurality of cutters in the medium; a second means for selectively extending and retracting each of the plurality of cutters wherein the second means comprises: a substantially closed loop circuit having a second flow of a secondary fluid wherein the second flow of the secondary fluid comprises a smart fluid; a plurality of pistons operably coupled with the substantially closed loop circuit, wherein each of the plurality of pistons are coupled with one of the plurality of cutters, and each piston is configured to move based at least in part on a pressure of the substantially closed loop circuit at that piston; a plurality of valves operably coupled with the substantially closed loop circuit, wherein the plurality of valves is configured to control a pressure of the substantially closed loop circuit at each of the plurality of pistons and wherein each piston has an inlet and outlet valve of the plurality of valves; and a third means for powering the second means. 19. The system for drilling a cavity in a medium of claim 18, wherein the first means comprises a chassis, wherein the chassis is coupled with: the plurality of cutters; and a rotational motion source. 20. The system for drilling a cavity in a medium of claim 18, wherein the third means comprises a pressure transfer device. 21. The system for drilling a cavity in a medium of claim 18, wherein the first means comprises an electric motor in a bottom hole assembly powered via wireline to a surface of the medium. 22. The system for drilling a cavity in a medium of claim 18, wherein the third means comprises an electric pump powered via wireline to a surface of the medium.