WELLHEAD DEVICE FOR ELIMINATION OF STICKINGS Russian patent published in 2003 - IPC

FIELD: drilling and operation of mineral deposits and repair operations. SUBSTANCE: wellhead device for elimination of stickings has linear pulse motor, capacitive storage and capacitive storage discharge unit. Linear pulse motor has multipole windings of armature and reactor. Capasitive storage is made in form of a row of branches of connected in parallel electrolytic capacitors and connected with power source. Capacitive storage is connected to power source by means of a row of diode-thyristor switches whose inputs separately connected with outputs of power source, and whose outputs are connected with separate branches of capacitive storage electrolytic capacitors. Each branch of capacitive storage is shunted by diode whose anode is placed to branch negative output, and whose cathode, to its positive output. Free output of reactor winding is connected to positive output of capacitive storage branch, and free output of armature winding, to negative output of branch. Capacitive storage discharge unit is located between negative output of one branch not connected to motor windings and positive output of other branch of capacitive storage. EFFECT: higher reliability of capacitive storage due to reduced reversing of polarity of electrolytic capacitors and provided similar voltage of their charging and recharging. 1 dwg