Well-logging apparatus with ring-shaped resistors and related methods

Patent metadata

Field	Value
Publication number	US-9320128-B2
Application number	US-201313830071-A
Country	US
Kind code	B2
Filing date	Mar 14, 2013
Priority date	Mar 29, 2012
Publication date	Apr 19, 2016
Grant date	Apr 19, 2016

Abstract

A well-logging apparatus may include a charged particle source, a target electrode, and an accelerator column. The accelerator column may include a housing extending between the charged particle source and the target electrode, a series of spaced apart accelerator electrodes carried by the housing, a series of ring-shaped resistors surrounding the housing, and a respective connector coupling adjacent ones of the series of ring-shaped resistors together and to a corresponding one of the series of spaced apart accelerator electrodes.

First claim

That which is claimed is:

1. A well-logging apparatus comprising:
a charged particle source;
a target electrode; and
an accelerator column comprising
a housing extending between said charged particle source and said target electrode,
a series of spaced apart accelerator electrodes carried by said housing,
a series of ring-shaped resistors surrounding said housing, and
a respective connector coupling adjacent ones of said series of ring-shaped resistors together and to a corresponding one of said series of spaced apart accelerator electrodes;
wherein each connector comprises:
an electrically conductive ring coupling the adjacent ones of said series of ring-shaped resistors and defining a resistor tap point; and
at least one electrically conductive link coupling the corresponding one of said accelerator electrodes to a corresponding tap point; and

wherein the adjacent ones of said series of ring-shaped resistors have recessed edges defining a channel to receive a corresponding one of said electrically conductive rings.

2. The well-logging apparatus of claim 1 , wherein the ring-shaped resistors have generally cylindrical or tube shapes surrounding said housing.

3. The well-logging apparatus according to claim 1 wherein each ring-shaped resistor comprises a dielectric substrate and a resistive trace thereon.

4. The well-logging apparatus according to claim 3 said dielectric substrate comprises a ceramic material.

5. The well-logging apparatus according to claim 3 wherein said resistive trace comprises an electrically resistive trace arranged in a spiral around said dielectric substrate.

6. The well-logging apparatus according to claim 1 wherein said at least one electrically conductive link comprises at least one electrically conductive spring.

7. The well-logging apparatus according to claim 1 wherein each connector comprises a corona ring surrounding said electrically conductive ring.

8. The well-logging apparatus according to claim 1 wherein said accelerator column comprises a plurality of spaced apart dielectric spacers between said housing and the adjacent ones of said series of ring-shaped resistors.

9. A method for making an accelerator column for charged particles comprising:
coupling a series of spaced apart accelerator electrodes along a housing;
coupling a series of ring-shaped resistors to surround the housing, wherein each respective ring-shaped resistor is radially contiguous around an axial position along the accelerator column; and
coupling a respective connector between adjacent ones of the series of ring-shaped resistors and to a corresponding one of the series of spaced apart accelerator electrodes,
wherein coupling the respective connector comprises:
positioning an electrically conductive ring to couple the adjacent ones of the series of ring-shaped resistors and defining a resistor tap point; and
using at least one electrically conductive link to couple the one of the accelerator electrodes to a corresponding tap point, and

wherein adjacent ones of the series of ring-shaped resistors have recessed edges defining a channel to receive a corresponding one of the electrically conductive rings.

10. The method according to claim 9 wherein each ring-shaped resistor comprises a dielectric substrate and a resistive trace thereon.

11. The method according to claim 10 the dielectric substrate comprises a ceramic material.

12. The method according to claim 9 comprising coupling a corona ring to surround the electrically conductive ring.

Assignees

• Schlumberger Technology Corp

Inventors

• Reijonen Jani Petteri
• De Looz Marc-Andre

Classifications

• Y10T29/49117

  Conductor or circuit manufacturing · CPC title

• H05H7/22

  Details of linear accelerators, e.g. drift tubes (H05H7/02 - H05H7/20 take precedence) · CPC title

• H05H5/04 Primary

  energised by electrostatic generators · CPC title

• H05H5/06

  Multistage accelerators · CPC title

• G01V5/08

  using primary nuclear radiation sources or X-rays {(, e.g. for inducing radioactivity; investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays, neutrons G01N23/00)} · CPC title