Production logging instrument

1. A logging instrument, comprising:

logging electronics configured to perform a logging operation;

a high temperature rechargeable energy storage configured to supply power to the logging electronics; and

an annular housing configured for mounting of the logging electronics and the high temperature rechargeable energy storage and configured to accommodate flow through the logging instrument;

wherein the high temperature rechargeable energy storage comprises an ultracapacitor that is configured to be repetitively charged using energy from the energy supply for periods of a first duration at a first power level, and to repetitively provide energy to the logging electronics for periods of a second duration at a second power level, wherein the first duration is longer than the second duration and the first power level is less than the second power level; and

wherein the ultracapacitor comprises:

a plurality of electrodes immersed in an electrolyte; and

where each electrode comprises a current collector upon which are disposed carbon nanotubes.

2. A logging instrument as defined in claim 1 , wherein the annular housing forms a portion of a production tubing of a wellbore.

3. A logging instrument as defined in claim 2 , wherein the annular housing includes a mechanical opening or other passive portion for transmission of electrical, thermal, pressure-related and/or other parameters, such that measurement and/or monitoring of the parameters can be performed by the logging electronics both inside and outside of the production tubing.

4. A logging instrument comprising:

logging electronics configured to perform a logging operation:

one or more sensors selected from sensor types including pressure, temperature, casing collar locator, accelerometer, acoustic density, seismic, caged and inline flow meters, solid-state flow meters, capacitance, inductance, resistivity, acoustic transmit and/or receive, passive gamma, active gamma, fluid sampling, formation sampling, magnetic resonance imaging, nuclear magnetic resonance, directional or inertial sensors, magnetic sensors and gyroscopes; and

a high temperature rechargeable energy storage configured to supply power to the logging electronics; wherein the high temperature rechargeable ultracapacitor comprises:

a plurality of electrodes immersed in an electrolyte;

where each electrode comprises a current collector upon which are disposed carbon nanotubes.

5. A logging instrument as defined in claim 4 , wherein the high temperature rechargeable energy storage is configured to receive trickle charging from a power source.

6. A method for operating a logging system, comprising:

moving a logging instrument vertically in a well during at least one time period by way of a cable that supports the logging instrument and provides transmission of information and/or transmission of power; and

holding the logging instrument at a fixed position in the well during a second time period, wherein the logging instrument comprises a high temperature rechargeable energy storage; wherein the high temperature rechargeable ultracapacitor comprises:

a plurality of electrodes immersed in an electrolyte;

where each electrode comprises a current collector upon which are disposed carbon nanotubes.

7. A method for operating a logging system as defined in claim 6 , wherein the cable comprises at least one conductor made of a material other than copper.

8. A method for operating a logging system as defined in claim 7 , wherein the cable comprises only conductors made of a material other than copper.

9. A method for operating a logging system as defined in claim 7 , wherein the cable comprises at least one conductor made of steel.