The force modulation system for a drill bit includes a cutter, a holder, a holder retention device, and a first force member. The cutter fits in the holder, and the holder fits in the drill bit. The holder retention device exerts a holder retention force in a first direction. The first force member exerts a first force in a second direction. The second direction is angled offset to the first direction so as that the cutting profile of the force modulation system is now variable in the second direction, according to the first force. There can also be a second force member to exert a second force in the first direction for more variability of the cutting profile in the first direction. The second force member can be made integral with the first force member.

An accessory is coupled to a body using a connection member inserted into a plurality of lateral recesses of a bore. The accessory includes a complementary connection mechanism to the connection member and is tightened in the bore with a torque. An example accessory is a nozzle for use with a drill bit. The nozzle includes threads and the drill bit includes a nozzle bore with lateral recesses. Partial thread segments are inserted into the lateral recesses, and the nozzle is threaded to the partial thread segments.

Apparatus and methods pertaining to moving a train rig between locations associated with corresponding different wellsites. Equipment carried by the train rig is operable in conjunction with forming wells each extending beneath a corresponding one of the wellsites. An adjustable swing arm mechanically and electrically connected to the train rig comprises a medium-voltage (MV) cable. The adjustable swing arm extends from the train rig to connect the MV cable to one of a plurality of MV electrical hubs each electrically connected to a remote MV electrical power source via, at least, MV electrical lines suspended above the wellsites. A piece of equipment carried by the train rig is energized by MV electrical power delivered via the adjustable swing arm, and then operated in conjunction with the subterranean well formation.

A magnetic depth of cut controller (DOCC) includes a housing having a body portion with a bore extending into the body portion and a depth of cut (DOC) element positioned at least partially within the bore and having a working face to engage a subterranean formation. The DOC element is moveable within the bore to extend or retract from a first end of the housing. Further, the DOCC includes a magnet secured within the bore of the housing between the DOC element and a second end of the housing. Moreover, the DOCC includes a magnetic fluid disposed within the bore of the housing between the DOC element and the second end of the housing. The magnetic fluid has a viscosity that changes responsive to proximity to the magnet to provide a variable resistance to movement of the DOC element.

A magnetic depth of cut controller (DOCC) includes a housing having a body portion with a bore extending into the body portion and a depth of cut (DOC) element positioned at least partially within the bore and having a working face to engage a subterranean formation. The DOC element is moveable within the bore to extend or retract from a first end of the housing. Further, the DOCC includes a magnet secured within the bore of the housing between the DOC element and a second end of the housing. Moreover, the DOCC includes a magnetic fluid disposed within the bore of the housing between the DOC element and the second end of the housing. The magnetic fluid has a viscosity that changes responsive to proximity to the magnet to provide a variable resistance to movement of the DOC element.

A method for determining a total torque output at a drill bit includes receiving an on-bottom pressure and an off-bottom pressure. The method also includes determining a differential pressure based upon the on-bottom pressure and the off-bottom pressure. The method also includes receiving a surface torque. The method also includes determining a torque transmission coefficient based at least partially upon the differential pressure and the surface torque. The method also includes determining the total torque output at the drill bit based at least partially upon the differential pressure, the surface torque, and the torque transmission coefficient.

A method for determining a total torque output at a drill bit includes receiving an on-bottom pressure and an off-bottom pressure. The method also includes determining a differential pressure based upon the on-bottom pressure and the off-bottom pressure. The method also includes receiving a surface torque. The method also includes determining a torque transmission coefficient based at least partially upon the differential pressure and the surface torque. The method also includes determining the total torque output at the drill bit based at least partially upon the differential pressure, the surface torque, and the torque transmission coefficient.

A downhole drilling tool comprises an earth-boring drill bit including a bit body and a shank coupled to the bit body. The drill bit includes a motion puck positioned in a cavity of the shank, wherein the motion puck includes a motion sensor to detect movement indicating a force applied to the earth-boring drill bit during a drilling operation. The drill bit includes a strain puck positioned in the cavity of the shank, wherein the strain puck includes a strain gauge to measure the force applied to the earth-boring drill bit during the drilling operation. The drill bit includes a plurality of blades disposed on exterior portions of the bit body, each blade having respective cutting elements disposed thereon.

A downhole drilling tool comprises an earth-boring drill bit including a bit body and a shank coupled to the bit body. The drill bit includes a motion puck positioned in a cavity of the shank, wherein the motion puck includes a motion sensor to detect movement indicating a force applied to the earth-boring drill bit during a drilling operation. The drill bit includes a strain puck positioned in the cavity of the shank, wherein the strain puck includes a strain gauge to measure the force applied to the earth-boring drill bit during the drilling operation. The drill bit includes a plurality of blades disposed on exterior portions of the bit body, each blade having respective cutting elements disposed thereon.

The force modulation system for a drill bit includes a cutter, a holder, a holder retention device, and a first force member. The cutter fits in the holder, and the holder fits in the drill bit. The holder retention device exerts a holder retention force in a first direction. The first force member exerts a first force in a second direction. The second direction is angled offset to the first direction so as that the cutting profile of the force modulation system is now variable in the second direction, according to the first force. There can also be a second force member to exert a second force in the first direction for more variability of the cutting profile in the first direction. The second force member can be made integral with the first force member.