Induced drilling method for inertia constrained implicated motion and inertial constraint induced drilling device

A induced drilling method for an inertia constrained implicated motion, characterized by comprising:

• in a first Step, including selection of a model for an induced drilling:
• a determined model for the induced drilling connecting an inertia gear ring with a planet carrier via a torsion spring;
• wherein determined parameters of the determined model for the induced drilling are:
• a transmission ratio m between a drill string input and a drill bit output in a drilling device induced by a inertia constraint of a PDC bit is more than or equal to m≥1.0, and a rotational inertia I of the inertia gear ring is equal to 0.25-5.4 kgm2;
• in a second Step, including storage of a potential energy of the induced drilling:
• starting a drilling system to enable the drill string to start storing potential energy in the torsion spring at a rotation speed ω0;
• when a torque of the drill bit reaches a rock breaking torque T0, the inertia gear ring twists the torsion spring by θ radian relative to the drill bit, and reverse potential energy-mt0θ is stored in the torsion spring according to a transmission method of a planetary gear reducer with a transmission ratio m;
• rotating the drill bit, and a stored reverse potential energy is kept in the torsion spring;
• the stored reverse potential energy exists as a median value of torque fluctuation change,
• a storage of the potential energy of the induced drilling is realized based on deformation of the torsion spring connected between a planet carrier output shaft of a planet gear reducer and the inertia ring gear;
• when the planet carrier output shaft and the inertia ring gear rotate relative to each other and the planet carrier output shaft rotates clockwise, the inertia ring gear rotates counterclockwise relative to the planet carrier output shaft, and the torsion spring between the planet carrier output shaft and the inertia ring gear generates elastic deformation,
• a storage direction of the potential energy of the induced drilling is opposite to a movement direction of the drilling system to form reverse energy storage;
• a storage stage of the induced drilling potential energy is a stage before the drill bit of the drilling system starts rock breaking;
• a storage size of the induced drilling potential energy is a median value of fluctuation change in the drilling process;
• in a third Step, including a steady and transient induced drilling:
• the steady and transient induced drilling have different working conditions, specifically:
• I under a uniform cutting induced drilling under a steady condition,
• cutting and inducing drilling at a constant speed under the steady condition, rotation speeds of a sun gear, the planet carrier and the inertia gear ring of the inertia constraint inducing drilling device are consistent,
• the stored potential energy has no relative change and remains in the torsion spring,
• II under distribution of a induced drilling shock wave propagation under a transient condition,
• during the induced drilling under the transient condition, generating with the drill bit shear wave S with torsional shear stress amplitude τ0, and the shear wave S propagates upward at the speed of transverse shear wave;
• the shear wave S propagates to a planet wheel through the planet carrier, according to conservation principle of momentum and kinetic energy and the transmission ratio m, a shear wave stress amplitude distributed to the inertia ring gear is −mτ0, and a shear wave stress amplitude distributed to the sun gear is τ0/m;
• the shear wave stress amplitude distributed to the inertia ring gear −mτ0 propagates into the torsion spring, causing circumferential wave motion of the inertia ring gear, effectively guiding and absorbing a impact wave motion of the drill bit;
• however, the stress amplitude τ0/m distributed to sun gear shear wave continues to upload along the drill string, weakening the disturbance in a drill string movement, thus improving a movement stability of the overall drilling system,
• III under potential energy release of the torsion spring in induced drilling under the transient condition,
• releasing an elastic potential energy stored in the torsion spring when the drill bit cutting at constant speed encounters resistance, which is a blocking energy, during drilling;
• energy released by a inertial constraint induced drilling system naturally matches the blocking energy to adapt to a blocking resistance during drilling;
• a resistance of the drill bit during drilling means that a rotation speed of the drill bit when stuck is zero or a rotation speed of the drill bit when stuck is reduced;
• a released energy naturally matches a blocked energy in accordance with energy conservation and momentum conservation laws;
• IV under constrained buffer for induced drilling under the transient condition,
• when the drill bit breaks through a resistance point, rotating the drill bit to accelerate the penetration, and dynamically redistributes an energy of the rock penetration of the drill bit;
• a dynamic redistribution is a momentum equilibrium distribution that changes with a time of encounter;
• the energy distributed to the inertia ring gear causes the inertia ring gear to return to forward rotation;
• energy distributed to the drill bit makes the drill bit continue to drill at a constant speed;
• V under potential energy compensation for induced drilling under the transient condition, sources of potential energy compensation for the induced drilling under the transient condition are:
• generating a torque energy input by the drill string during the drilling is supplemented to the potential energy of the torsion spring;
• and
• a potential energy generated by a relative displacement change between a forward rotation of the inertia gear ring and the uniform drilling motion of the drill bit is input and supplemented into the torsion spring.