Robert J Schroeder, 7271 Castle Hill Rd, Newtown, CT 06470

6363180, Mar 26, 2002

Apr 30, 1999

09/303163

Tsutomu Yamate - Brookfield CT
Robert J. Schroeder - Newtown CT
Rogerio T. Ramos - Bethel CT
Eric Udd - Troutdale OR

Schlumberger Technology Corporation - Ridgefield CT

G02B 600

385 12, 385 11, 385 37, 356 355, 356364

Methods for enhancing dynamic range, sensitivity, accuracy, and resolution in fiber optic sensors include manipulating the polarization characteristics of the light entering a fiber optic sensor and/or manipulating the polarization characteristics of the light exiting the sensor before it enters the light detection system. An apparatus according to the invention includes a fiber optic core having one or more gratings written onto it, a light source and a detection system for detecting light transmitted through the grating or reflected by the grating. The light source and the spectral demodulation system may be coupled to opposite ends of the fiber optic (transmission mode) or may be coupled to the same end of the fiber optic through the use of a beam splitter and terminators (reflection mode). Apparatus according to the invention include a polarizer and controller located either between the light source and the fiber or between the fiber and the detection system. Other embodiments of the invention include a depolarizing scrambler before the detection system so that the light entering the detection system is depolarized.

6751556, Jun 15, 2004

Dec 12, 2002

10/317556

Robert J. Schroeder - Newtown CT
Jeffrey Tarvin - Brookfield CT
Rogerio T. Ramos - Chandlers Ford, GB
George A. Brown - Beaconsfield, GB

Sensor Highway Limited - Southampton

G01V 802

702 6, 702 12, 7315233

A technique usable with a subterranean well includes deploying a first optical sensor downhole in the subterranean well. The technique includes observing an intensity of backscattered light from the first optical sensor to measure a distribution of a characteristic along a portion of the well. The technique includes deploying a second sensor downhole to measure the characteristic at discreet points within the portion. The second sensor is separate from this first sensor and includes at least one interferometric sensor.

6898339, May 24, 2005

Dec 16, 2002

10/233355

Jagdish Shah - Wallingford CT, US
Robert Schroeder - Newtown CT, US
Philip Dryden - Danbury CT, US
Rogerio Ramos - North Baddesley, GB
Raghu Madhavan - Houston TX, US

Schlumberger Technology Corporation - Ridgefield CT

G02B006/00
G01J001/04
G01J001/42

385 13, 385 12, 25022714, 25022717, 25022718, 340555, 340556, 7386142, 7386146, 7386147

A multiple mode pre-loadable fiber optic pressure and temperature sensor includes a generally cylindrical structure having at least one compression element, a fiber optic having a Bragg grating in contact with one side of the compression element, a diaphragm in contact with the other side of the compression element, and a fluid port in fluid communication with the diaphragm. According to preferred aspects of the, a groove is provided in at least one compression element for receiving the fiber optic. The sensor is pre-loaded by straining the diaphragm over the adjacent compression element when the cover is attached. The compression element in contact with the diaphragm preferably has a contoured surface contacting the diaphragm and the diaphragm is stretched to match that contour. By varying the contour of the compression element and the thickness of the diaphragm, the dynamic range of the sensor can be changed. The preferred diaphragm has a variable thickness and is made as an integral part of the structure.

6946645, Sep 20, 2005

Dec 11, 2003

10/733531

Jeffrey A. Tarvin - Brookfield CT, US
Robert J. Schroeder - Newtown CT, US
Rogerio T. Ramos - Chandlers Ford, GB
Tsutomu Yamate - Yokohama, JP

Schlumberger Technology Corporation - Ridgefield CT

G01B011/16

25022714, 25022718

High-resolution measurement of a parameter is provided at multiple different locations simultaneously along an optic fiber. Light within a predefined range of wavelengths is transmitted into an optic fiber that contains multiple birefringent fiber optic pressure transducers, each including a Fiber Bragg Grating. Each grating defines a spatially modulated index of refraction and a wavelength that is unique within the system. A sweeping comb filter is used to apply optical comb filtering to light reflected from the transducers so as to pass filtered light having multiple spectral portions, each spectral portion associated with one transducer. The free spectral range of the sweeping comb filter is set to be approximately equal to the spectral range of a single spectral portion. Wavelength division multiplexing is applied to the filtered light so as to separate the spectral portions. The value of a parameter is preferably determined using the spectral spacing of two maxima of spectral intensity in each spectral portion.

7126680, Oct 24, 2006

May 18, 2006

11/436162

Tsutomu Yamate - Yokohama, JP
Robert J. Schroeder - Newtown CT, US
Rogerio T. Ramos - North Baddesley, GB
Oliver C. Mullins - Ridgefield CT, US

Schlumberger Technology Corporation - Sugar Land TX

G01N 21/00

356 731

Methods for calibrating and making measurements using fiber optic sensors are disclosed using backscattered wavelengths and independent sensors. The disclosure sets outs methods applicable with fiber optic sensors either in a deployed in a loop and in a linear configuration and useful for measurements including temperature.

7215416, May 8, 2007

Jun 12, 2006

11/450327

Tsutomu Yamate - Yokohama, JP
Robert J. Schroeder - Newtown CT, US
Rogerio T. Ramos - North Baddesley, GB
Oliver C. Mullins - Ridgefield CT, US

Schlumberger Technology Corp. - Sugar Land TX

G01N 21/00

356 731

Methods for calibrating and making measurements using fiber optic sensors are disclosed using backscattered wavelengths and independent sensors. The disclosure sets outs methods applicable with fiber optic sensors either in a deployed in a loop and in a linear configuration and useful for measurements including temperature.

7279678, Oct 9, 2007

Aug 15, 2005

11/203743

A. Ballard Andrews - Wilton CT, US
Jacques Jundt - Bethel CT, US
Robert J. Schroeder - Newtown CT, US
Bhavani Raghuraman - Wilton CT, US
Oliver C. Mullins - Ridgefield CT, US

Schlumber Technology Corporation - Ridgefield CT

G01V 8/00

2502691

Methods and apparatus for analyzing a hydrocarbon mixture are disclosed, comprising at least one light-emitting diode (LED) and at least one photodetector positioned to detect energy transmitted by the LED through a sample of the hydrocarbon mixture. In at least one embodiment an optical filter is coupled to the output of the LED to mitigate the adverse effects of the LED's sensitivity to temperature.

7658226, Feb 9, 2010

Oct 20, 2006

11/551310

Murtaza Ziauddin - Richmond TX, US
Bhavani Raghuraman - Lexington MA, US
Li Jiang - Ridgefield CT, US
Xuefei Sun - Plano TX, US
Sebastien Fremont - Montrouge, FR
Ballard Andrews - Wilton CT, US
Robert Schroeder - Newtown CT, US
Stephen Hill - Pearland TX, US
Mahmuda Afroz - El Cerrito CA, US
Frank Espinosa - Richmond TX, US
Michael Orlet - Houston TX, US
John Lovell - Houston TX, US
Steve Davies - Sugar Land TX, US

Schlumberger Technology Corporation - Sugar Land TX

E21B 43/27
E21B 47/10

16625001, 7315229, 7315231, 7315239, 166 66, 1662523, 166281, 166384

Although the methods have been described here for, and are most typically used for, hydrocarbon production, fluid diversion measurement systems and methods are described. One method includes inserting a tubular tubing having one more fluid injection ports into a wellbore, injecting a treatment fluid through the injection port, and determining differential flow of the treatment fluid at one or more wellbore based on measuring the concentration of at least one particular component of a wellbore fluid located in the annulus formed between the wellbore and tubular; and using the measured parameters in realtime to monitor, control, or both monitor and control diversion of the fluid.