US 11,697,978 B2
Power system for downhole toolstring
Riccardo Signorelli, The Woodlands, TX (US); and John J. Cooley, Boston, MA (US)
Assigned to FASTCAP SYSTEMS CORPORATION, Boston, MA (US)
Filed by FastCAP SYSTEMS Corporation, Boston, MA (US)
Filed on Aug. 2, 2019, as Appl. No. 16/530,698.
Application 16/530,698 is a continuation of application No. 14/525,159, filed on Oct. 27, 2014, abandoned.
Application 14/525,159 is a continuation in part of application No. PCT/US2014/029992, filed on Mar. 15, 2014.
Application PCT/US2014/029992 is a continuation in part of application No. 13/843,746, filed on Mar. 15, 2013, abandoned.
Claims priority of provisional application 61/896,009, filed on Oct. 25, 2013.
Claims priority of provisional application 61/888,133, filed on Oct. 8, 2013.
Prior Publication US 2020/0095847 A1, Mar. 26, 2020
Int. Cl. E21B 41/00 (2006.01); H02J 7/00 (2006.01); H01G 11/62 (2013.01); H02J 7/34 (2006.01)
CPC E21B 41/0085 (2013.01) [H01G 11/62 (2013.01); H02J 7/0016 (2013.01); H02J 7/007192 (2020.01); H02J 7/007182 (2020.01); H02J 7/345 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A downhole power system comprising:
a first rechargeable energy storage device (ESD) within a toolstring to provide power to one or more tools within the toolstring; and
a controller for controlling at least one of charging and discharging of the first ESD;
wherein the first ESD is configured to be operable at a temperature range of −40 degrees C. to 250 degrees C. to:
receive power from a power source at a first power level that is lower than a power requirement of a first tool in the toolstring, where the one or more tools in the toolstring comprises the first tool; and
output power to the one or more tools within the toolstring at a second power level that is at or above the requirement of the first tool in the toolstring; and
wherein the power system is coupled to a DC motor drive circuit, and a load of the DC motor drive circuit comprises a brushless DC motor; characterized in that the ESD comprises an ultracapacitor comprising an advanced electrolyte system (“AES”) and the AES comprises a salt of the following formula:

OG Complex Work Unit Chemistry
wherein R1 is straight-chain or branched alkyl having 1 to 4 carbon atoms, R2 is methyl or ethyl, and X− is [B(CN)4]— or [BFn(CN)4-n]— where n=0, 1, 2 or 3;
wherein the AES is purified to contain less than 1000 ppm of chloride ions, less than about 100 ppm of fluoride ions, and/or less than about 100 ppm of water;
wherein the ultracapacitor comprises a positive electrode and a negative electrode, where at least one electrode comprises an energy storage media, the energy storage media comprising carbon nanotubes, the energy storage media consisting of at least 98% by mass elemental carbon; and
wherein at least one of the electrodes has a moisture content of less than 350 ppm and chloride content of less than 300 ppm.