US 11,988,092 B2
Switches for downhole electrocrushing drilling
William M. Moeny, Bernalillo, NM (US)
Assigned to Halliburton Energy Services, Inc., Houston, TX (US); Chevron U.S.A. Inc., San Ramon, CA (US); and SDG LLC, Minden, NV (US)
Filed by Halliburton Energy Services, Inc., Houston, TX (US); Chevron U.S.A. Inc., San Ramon, CA (US); and SDG LLC, Minden, NV (US)
Filed on Oct. 7, 2020, as Appl. No. 17/065,064.
Application 17/065,064 is a division of application No. 15/778,496, abandoned, previously published as PCT/US2016/018925, filed on Feb. 22, 2016.
Prior Publication US 2021/0025240 A1, Jan. 28, 2021
Int. Cl. E21B 7/15 (2006.01); E21B 10/00 (2006.01)
CPC E21B 7/15 (2013.01) [E21B 10/00 (2013.01)] 15 Claims
OG exemplary drawing
 
1. A downhole drilling system, comprising:
a bottom-hole assembly including
a pulse-generating circuit including
a transformer including
a pulse-generating core;
a primary winding electrically coupled with the pulse-generating core and electrically coupled to receive a switch-transformed electrical current; and
a secondary winding to output a pulse-generating transformed electrical current that is derived from the switch-transformed electrical current flowing in the primary winding; and
a magnetic switch electrically coupled with the primary winding of the transformer, the magnetic switch including
a switch core;
a primary coil electrically coupled with a power source, the transformer, and the switch core, wherein the primary coil is to receive an input electrical current from the power source;
a secondary coil electrically coupled with the switch core, wherein the secondary coil is to output the switch-transformed electrical current to the primary winding of the transformer that is derived from the input electrical current flowing in the primary coil; and
a reset-pulse generator that is configured to transmit, via at least one of the secondary coil or the primary coil, a current to move the switch core from a saturated state to an unsaturated state such that the magnetic switch is returned to being opened in response to the switch core moving to the unsaturated state; and
a drill bit including a first electrode and a second electrode electrically coupled to the pulse-generating circuit to receive a pulse from the pulse-generating circuit.