US 12,421,848 B2
Power and telemetry systems for a downhole instrument
John Henry McKay, Stonehaven (GB); and David Sirda Shanks, Newmachar (GB)
Assigned to Expro North Sea Limited, Dyce (GB)
Appl. No. 17/621,489
Filed by Expro North Sea Limited, Dyce (GB)
PCT Filed Jun. 16, 2020, PCT No. PCT/EP2020/066556
§ 371(c)(1), (2) Date Dec. 21, 2021,
PCT Pub. No. WO2020/254286, PCT Pub. Date Dec. 24, 2020.
Claims priority of application No. 1908929 (GB), filed on Jun. 21, 2019.
Prior Publication US 2022/0397032 A1, Dec. 15, 2022
Int. Cl. E21B 47/13 (2012.01); H02J 7/00 (2006.01)
CPC E21B 47/13 (2020.05) [H02J 7/0047 (2013.01); H02J 7/00712 (2020.01)] 13 Claims
OG exemplary drawing
 
1. A downhole instrument system for permitting continued operation of a downhole instrument after one or more failure modes, a power system for use in the downhole instrument system, comprising:
an electrical power supply in electrical communication with the downhole instrument via an electrical power connection comprising one or more lengths of electrical cable and one or more electrical cable terminations;
a load monitor configured to monitor a load on the electrical power supply, wherein the monitored load is dependent on one or more failure modes related to the electrical power connection; and
a power controller configured to control the electrical power supplied to the downhole instrument based on the monitored load;
wherein the load monitor is configured to determine a total load on the electrical power supply and to determine a proportion of the total load that is related to the one or more failure modes; and
wherein the load monitor is configured to determine the proportion of the total load based on data relating to one or more of a voltage and a current drawn by the downhole instrument.