公开(公告)号：US20200174155A1

公开(公告)日：2020-06-04

申请号：US16203867

申请日：2018-11-29

Applicant: Schlumberger Technology Corporation

Inventor： Matthieu Simon ,  Jani Reijonen

IPC: G01V5/08 ,  E21B41/00 ,  E21B47/01 ,  H05H5/06 ,  H05H5/04

Abstract: A downhole tool may include a voltage multiplier within a housing. The voltage multiplier may transform input power to the downhole tool from a first voltage to a second voltage higher than the first. The downhole tool may also include multiple shielding rings surrounding at least the voltage multiplier to reduce electric field stresses within the downhole tool. Additionally, the downhole tool may include an insulator located between the shielding rings and the housing.

公开(公告)号：US08779351B2

公开(公告)日：2014-07-15

申请号：US13720699

申请日：2012-12-19

Applicant: Schlumberger Technology Corporation

Inventor： Jani Reijonen ,  Irina Molodetsky ,  Kenneth E. Stephenson

IPC: G01V5/10 ,  H01J37/08 ,  G01V5/04

CPC classification number: G01V5/10 ,  G01V5/04 ,  H01J27/205 ,  H01J37/08 ,  H01J43/02 ,  H01J2237/08

Abstract: An ion source includes a cathode emitting primary electrons, a cathode grid downstream of the cathode, a reflector electrode downstream of the cathode grid, a reflector grid radially inward of the reflector electrode, and an extractor electrode downstream of the reflector electrode. The cathode and the cathode grid have a voltage difference such that the electric field accelerates the primary electrons on a trajectory toward the extractor electrode. The reflector grid and the extractor electrode have a voltage difference such that the electric field repels the primary electrons on a trajectory away from the extractor electrode and toward the reflector electrode. The cathode and reflector electrode have a voltage difference such that some primary electrons strike the reflector electrode, creating secondary electrons. The reflector grid has a positive potential such that the electric field attracts the primary and secondary electrons into the ionization region where they interact with ionizable gas.

Abstract translation: 离子源包括发射一次电子的阴极，阴极下游的阴极栅极，阴极栅极下游的反射器电极，反射器电极的径向向内的反射器栅格，以及反射器电极下游的提取器电极。 阴极栅极和阴极栅极具有电压差，使得电场在朝向提取器电极的轨迹上加速初级电子。 反射器栅格和提取器电极具有电压差，使得电场排斥远离提取器电极并朝向反射器电极的轨迹上的主电子。 阴极和反射器电极具有电压差，使得一些一次电子撞击反射器电极，产生二次电子。 反射器栅格具有正电位，使得电场将一次电子和二次电子吸引到电离区域，在那里它们与可电离气体相互作用。

公开(公告)号：US20140166872A1

公开(公告)日：2014-06-19

申请号：US13720699

申请日：2012-12-19

Applicant: SCHLUMBERGER TECHNOLOGY CORPORATION

Inventor： Jani Reijonen ,  Irina Molodetsky ,  Kenneth E. Stephenson

IPC: H01J27/20

CPC classification number: G01V5/10 ,  G01V5/04 ,  H01J27/205 ,  H01J37/08 ,  H01J43/02 ,  H01J2237/08

Abstract: An ion source includes a cathode emitting primary electrons, a cathode grid downstream of the cathode, a reflector electrode downstream of the cathode grid, a reflector grid radially inward of the reflector electrode, and an extractor electrode downstream of the reflector electrode. The cathode and the cathode grid have a voltage difference such that the electric field accelerates the primary electrons on a trajectory toward the extractor electrode. The reflector grid and the extractor electrode have a voltage difference such that the electric field repels the primary electrons on a trajectory away from the extractor electrode and toward the reflector electrode. The cathode and reflector electrode have a voltage difference such that some primary electrons strike the reflector electrode, creating secondary electrons. The reflector grid has a positive potential such that the electric field attracts the primary and secondary electrons into the ionization region where they interact with ionizable gas.

Abstract translation: 离子源包括发射一次电子的阴极，阴极下游的阴极栅极，阴极栅极下游的反射器电极，反射器电极的径向向内的反射器栅格，以及反射器电极下游的提取器电极。 阴极栅极和阴极栅极具有电压差，使得电场在朝向提取器电极的轨迹上加速初级电子。 反射器栅格和提取器电极具有电压差，使得电场排斥远离提取器电极并朝向反射器电极的轨迹上的主电子。 阴极和反射器电极具有电压差，使得一些一次电子撞击反射器电极，产生二次电子。 反射器栅格具有正电位，使得电场将一次电子和二次电子吸引到电离区域，在那里它们与可电离气体相互作用。

公开(公告)号：US20140166870A1

公开(公告)日：2014-06-19

申请号：US13720677

申请日：2012-12-19

Applicant: SCHLUMBERGER TECHNOLOGY CORPORATION

Inventor： Jani Reijonen ,  Irina Molodetsky ,  Kenneth E. Stephenson

IPC: H01J27/08

CPC classification number: H01J27/08

Abstract: An ion source includes a cathode to emit electrons, a cathode grid downstream of the cathode, a reflector electrode downstream of the cathode grid, reflector grid radially inward of the reflector electrode, and an extractor electrode downstream of the reflector electrode, the extractor electrode and cathode grid defining an ionization region therebetween. The cathode and the cathode grid have a first voltage difference such the electrons are accelerated through the cathode grid and into the ionization region on a trajectory toward the extractor electrode. The reflector grid and the extractor electrode have a second voltage difference less than the first voltage difference such that the electrons slow as they near the extractor electrode and are repelled on a trajectory toward the reflector electrode. The reflector electrode has a negative potential such that the electrons are repelled away from the reflector electrode and into the ionization region.

Abstract translation: 离子源包括发射电子的阴极，阴极下游的阴极栅极，阴极栅极下游的反射器电极，反射器电极的径向内侧的反射器栅极和反射器电极下游的提取器电极，提取器电极和 阴极栅极限定其间的电离区域。 阴极和阴极栅极具有第一电压差，使得电子通过阴极栅极加速并进入到提取器电极的轨迹上的电离区域。 反射器栅格和提取器电极具有小于第一电压差的第二电压差，使得电子随着它们靠近提取器电极而减慢并且在朝向反射器电极的轨迹上被排斥。 反射器电极具有负电位，使得电子被反射离开反射器电极并进入电离区域。

公开(公告)号：US20130180780A1

公开(公告)日：2013-07-18

申请号：US13718888

申请日：2012-12-18

Applicant: Schlumberger Technology Corporation

Inventor： Leo Chirovsky ,  Luke Perkins ,  Jani Reijonen ,  Loic Vilde

IPC: G01N23/00 ,  H05H3/06

CPC classification number: E21B47/00 ,  G01N23/005 ,  G01N33/24 ,  G21G4/02 ,  H05H3/06

Abstract: A method for operating a pulsed neutron generator including an ionizer with an electron emitting cathode and a grid wherein the cathode and grid are disposed in a sealed chamber. At least one of the following is applicable to the ionizer; a distance between the cathode and the grid, a cathode current and/or a potential on the grid are selected such that the ionizer operates at most about one-half the space charge limited current for a grid current selected to provide a predetermined amount of neutron production.

Abstract translation: 一种用于操作脉冲中子发生器的方法，其包括具有电子发射阴极和栅极的电离器，其中阴极和栅极设置在密封室中。 以下至少一项适用于电离器; 选择阴极和栅极之间的距离，栅极上的阴极电流和/或电势，使得电离器对于选择用于提供预定量的中子的电网电流的空间电荷限制电流的至多约一半的操作 生产。