James E Dunlap

US Patent:

7075063, Jul 11, 2006

Filed:

Sep 25, 2003

Appl. No.:

10/670615

Inventors:

Chengli Dong - Pearland TX, US
Soraya S. Betancourt - Ridgefield CT, US
Go Fujisawa - Danbury CT, US
Oliver C. Mullins - Ridgefield CT, US
James J. Dunlap - Sugar Land TX, US

Assignee:

Schlumberger Technology Corporation - Ridgefield CT

International Classification:

G01V 8/00

US Classification:

2502691, 250258

Abstract:

The invention provides a method for determining phase transition pressure of downhole retrograde condensate. An OBM-contamination value is produced from a time-series of fluorescence values produced by measuring fluorescence emitted from a single-phase flow of OBM-contaminated formation fluid in a downhole cell during a cycle of time. The pressure of fluid in the cell is set at a transition boundary by incrementing drawdown pressure and monitoring the presence or absence of a phase transition. An apparent phase transition pressure value associated with the cycle of time is produced by setting apparent phase transition pressure value equal to cell pressure. This process is repeated for several cycles of time to produce a number of pairs of OBM-contamination value and apparent phase transition pressure value as OBM-contamination decreases over time. The value of phase transition pressure is determined by extrapolating from a representation of apparent phase transition pressure values versus OBM-contamination values.

US Patent:

7195063, Mar 27, 2007

Filed:

Jul 30, 2004

Appl. No.:

10/710743

Inventors:

Matheus Nogueira - Macae, BR
James J. Dunlap - Sugar Land TX, US
Andrew J. Carnegie - Abu Dhabi, AE
Alejandro Duran - Bologna, IT
Edward Harrigan - Danbury CT, US
Ricardo Vasques - Sugar Land TX, US
Nicolas Adur - Capital, AR

Assignee:

Schlumberger Technology Corporation - Sugar Land TX

International Classification:

E21B 49/10
E21B 49/08

US Classification:

166264, 166100, 175 59, 7315217, 7315224, 7315228

Abstract:

A method and apparatus for sampling formation fluid includes drawing formation fluid from the subterranean formation into the downhole tool and collecting the formation fluid in a sample chamber. An exit flow line is operatively connected to the sample chamber for selectively removing a contaminated and/or clean portion of the formation fluid from the sample chamber whereby contamination is removed from the sample chamber. For example, a clean portion of the formation fluid may be passed to another sample chamber for collection, or a contaminated portion may be dumped into the borehole.

Address:

1325 S Dairy Ashford Rd RM 3512, Houston, TX 77077

Phone:

2812854677

VIN:

KMHEC4A46CA056217

Make:

HYUNDAI

Model:

SONATA HYBRID

Year:

2012