Nestor G Rodriguez

US Patent:

6300626, Oct 9, 2001

Filed:

Aug 16, 1999

Appl. No.:

9/375080

Inventors:

Ansgar Brock - San Diego CA
Nestor Rodriguez - Berkeley CA
Richard N. Zare - Stanford CA

Assignee:

Board of Trustees of the Leland Stanford Junior University - Stanford CA

International Classification:

H01J 4940

US Classification:

250287

Abstract:

An ion beam supplied from a source is modulated so that ions at a constant flux is passed during on periods or portions thereof and are deflected or stopped during off periods according to a binary sequence in order to encode the ion beam with phase information of the sequence. The binary sequence is such that ions released during two consecutive on periods overlap before reaching a detector, thereby increasing the duty-cycle. The detector output signal is demodulated using the phase information of the binary sequence to recover an ion mass spectrum.

US Patent:

20220389814, Dec 8, 2022

Filed:

Aug 16, 2022

Appl. No.:

17/888756

Inventors:

- Houston TX, US
Matthew L. Lee - Tomball TX, US
Ameet B. Agnihotri - Cypress TX, US
Charles Wilton Seckar - Katy TX, US
Christopher Michael Jones - Katy TX, US
Nestor Javier Rodriguez - Shenandoah TX, US
Darren George Gascooke - Houston TX, US

International Classification:

E21B 49/10
E21B 49/00
E21B 47/008
E21B 47/06

Abstract:

A system includes a pipe string; a wireline cable run through the pipe string; and a downhole tool for formation testing, wherein the downhole tool comprises, an upper assembly, an impeller unit connected to a downhole end of the upper assembly, wherein the impeller unit comprises a first impeller coupled to a second impeller by a shaft, a first flowline having a first end that is open to the formation, a packer unit that isolates a portion of a borehole surrounding the first end of the first flowline from the rest of the borehole, and a tool string connected to the first flowline, wherein the tool string hydraulically connects the packing device to the upper assembly.

US Patent:

20170241262, Aug 24, 2017

Filed:

Sep 16, 2014

Appl. No.:

15/504911

Inventors:

- Houston TX, US
Lizheng ZHANG - Humble TX, US
Robert ATKINSON - Conroe TX, US
Nestor RODRIGUEZ - Shenandoah TX, US
Christopher Michael JONES - Houston TX, US
Darren GASCOOKE - Houston TX, US

International Classification:

E21B 49/08
G01N 11/16

Abstract:

A downhole formation fluid viscometer sensor and method therefor include a viscometer sensing package, a flexible diaphragm, a magnet and electric coil, and a signal pickup assembly. The viscometer sensor may also include a first cavity and a second cavity for mechanical and electric energy transfer. The magnet and electric coil may be driven by external alternating current to generate an electromagnetic force. Silicon oil may be used to fill the first cavity and/or a pressure balance hole may connect the first cavity to an external area. The diaphragm may be a titanium alloy and a ferromagnetic magnet may be attached to the diaphragm. The diaphragm preferably has a thickness from about 0.030 to about 0.040 inches and the magnet and electric coil can propel the diaphragm to vibrate at a frequency from 0 to 100 kHz. Formation fluid viscosity is determined using resonant frequency linewidth, with contributions from the sensor package intrinsic properties removed.

US Patent:

20170167255, Jun 15, 2017

Filed:

Mar 7, 2014

Appl. No.:

15/115639

Inventors:

- HOUSTON TX, US
Nestor Rodriguez - Shenandoah TX, US
William Wade Samec - Katy TX, US
James Masino - Houston TX, US
Burkay Donderici - Houston TX, US

Assignee:

HALLIBURTON ENERGY SERVICES, INC. - HOUSTON TX

International Classification:

E21B 49/08
E21B 47/06
G01N 33/00
G01N 33/24
G01N 1/20
G01N 1/14

Abstract:

Disclosed herein are methods and system for formation fluid sampling. In at least some embodiments, the method includes pumping formation fluid from a public flow line of a downhole tool via a private flow line into a detachable sample chamber. The method also includes isolating the private flow line from the public flow line. The method also includes collecting measurements of the formation fluid in the private flow line. The method also includes associating the measurements with the detachable sample chamber.

US Patent:

20160290133, Oct 6, 2016

Filed:

Oct 30, 2014

Appl. No.:

14/895032

Inventors:

- Houston TX, US
LIZHENG ZHANG - HUMBLE TX, US
ROBERT ATKINSON - RICHMOND TX, US
NESTOR RODRIGUEZ - SHENANDOAH TX, US
CHRISTOPHER MICHAEL JONES - HOUSTON TX, US
DARREN GASCOOKE - HOUSTON TX, US

International Classification:

E21B 49/08
G01V 1/52
G01V 1/48
E21B 47/06

Abstract:

A downhole sensor package for detecting one or more thermophysical properties of a downhole fluid, comprising a sensor housing having a fluid input port and a fluid output port; an inner flow tube located within and axially defined with the sensor package housing; an outer flow annulus defined between the inner flow tube and the sensor housing, wherein the inner flow tube is in fluid communication with the outer flow annulus; and a vibration source and a vibration detector engaging the inner flow tube; and methods for using the same are disclosed.

US Patent:

20160216187, Jul 28, 2016

Filed:

Nov 6, 2013

Appl. No.:

15/024316

Inventors:

- Houston TX, US
Michael T. Pelletier - Houston TX, US
Dingding Chen - Tomball TX, US
Nestor Rodriguez - Shenandoah TX, US

Assignee:

Halliburton Energy Services, Inc. - Houston TX

International Classification:

G01N 11/00
E21B 49/08

Abstract:

System, methods, and apparatuses for determining properties of a production fluid downhole are presented. In one instance, a system includes a sample-filled sensing device for vibrating a first suspended tube containing a sample of production fluid and producing a first response signal. The system also includes a reference-fluid sensing device with a second suspended tube containing a viscosity -tunable fluid therein. The system vibrates the second suspended tube to create a second response signal. The viscosity of the viscosity -tunable fluid is varied until it is deemed to match that of the sample production fluid. Other systems and methods are presented.

US Patent:

20150101404, Apr 16, 2015

Filed:

Aug 28, 2012

Appl. No.:

14/399377

Inventors:

Dingding Chen - Tomball TX, US
Li Gao - Katy TX, US
Michael T. Pelletier - Houston TX, US
Nestor Javier Rodriguez - Shenandoah TX, US

International Classification:

G01N 9/00
E21B 49/08

US Classification:

7315205

Abstract:

In some embodiments, an apparatus and a system, as well as a method and an article, may operate to receive a vibration signal having a frequency and a characteristic (e.g., voltage) proportional to the vibration amplitude of a tube in a vibrating tube density sensor. Further activity may include transmitting the density of a fluid flowing through the tube based on the frequency and an elastic modulus of the tube determined by the value of the characteristic. Additional apparatus, systems, and methods are described.