Cheng Y Liu

US Patent:

6591673, Jul 15, 2003

Filed:

Nov 28, 2001

Appl. No.:

09/980128

Inventors:

Cheng Bing Liu - Houston TX

Assignee:

Schlumberger Technology Corporation - Sugar Land TX

International Classification:

G01V 338

US Classification:

7315218, 7315242, 7315255, 1662525, 1662542, 324346, 324366

Abstract:

A method of identifying the fluid type of subterranean formations according to the correlation between the variation trend of electrical resistivity with depth downhole in a borehole and the variation trend of porosity with depth downhole in the same borehole. The method includes the steps of: a) determining the rate of change with depth of a resistivity parameter (such as deep resistivity) of the formation surrounding the borehole; b) determining the rate of change with depth of a porosity parameter (such as total porosity and/or free fluid porosity measured by a nuclear magnetic resonance technique) of the formation surrounding the borehole; c) determining a comparison of the rate of change with depth of such resistivity parameter and the rate of change with depth of such porosity parameter for a given depth in the borehole; and d) using the comparison to determine the nature of the fluid in the formation surrounding the borehole at that depth downhole or in a given depth window downhole.

US Patent:

6832159, Dec 14, 2004

Filed:

Apr 23, 2003

Appl. No.:

10/249612

Inventors:

Jan W. Smits - Sugar Land TX
Peter T. Wu - Sugar Land TX
Qiming Li - Sugar Land TX
Cheng Bing Liu - Houston TX

Assignee:

Schlumberger Technology Corporation - Sugar Land TX

International Classification:

G01V 1100

US Classification:

702 11

Abstract:

A method for identifying environmental effects in well log data includes selecting a plurality of models, each of the plurality of models including at least one parameter to be optimized; fitting the models to the well log data by optimizing the at least one parameter, the fitting producing a plurality of optimized models; determining an indicator of goodness of fit for each of the plurality of optimized models; and selecting a model representing a best fit of the well log data based on the indicator.

US Patent:

6950748, Sep 27, 2005

Filed:

Jul 25, 2003

Appl. No.:

10/604492

Inventors:

Cheng Bing Liu - Houston TX, US
Qiming Li - Sugar Land TX, US
Frank P. Shray - Sugar Land TX, US
Jacques Tabanou - Houston TX, US

Assignee:

Schlumberger Technology Corporation - Sugar Land TX

International Classification:

G01V003/38

US Classification:

702 7, 324339

Abstract:

Techniques for determining a formation property by simplifying various two-geological-layer or multi-geological-layer models into a multi-electrical-layer model. A volume fraction of a layer in a multi-electrical-layer model is determined for an anisotropic region (sliding window) of the formation. The multi-electrical-layer electrical model includes a relative-lower-resistivity layer and a relative-higher-resistivity layer. A high-resolution resistivity measurement is used in the determination and resistivities for the relative-lower-resistivity layer and for the relative-higher-resistivity layer based on the volume fraction and bulk resistivity measure ments of the anisotropic region are determined. The formation property is based on the volume fraction, the resistivity of the relative-lower-resistivity layer, the resistivity of the relative-higher-resistivity layer, a total porosity of the anisotropic region, and bulk resistivity measurements of the region.

US Patent:

20150141013, May 21, 2015

Filed:

Nov 19, 2013

Appl. No.:

14/084578

Inventors:

- Atlanta GA, US
Hongyan Lei - Plano TX, US
Cheng P. Liu - Johns Creek GA, US
Yonghui Tong - Alpharetta GA, US

Assignee:

AT&T Mobility II LLC - Atlanta GA
AT&T Intellectual Property I, L.P. - Atlanta GA

International Classification:

H04W 36/32

US Classification:

455436

Abstract:

A user equipment device cell reselection procedure includes scaling factors that are based on cell-types of a camping cell and neighbor cells and a mobility state of the user equipment device. The scaling factors can be received in a system information block message. During an idle mode cell selection/reselection procedure, the user equipment device can apply the appropriate scaling factor to the hysteresis during the cell selection/reselection procedure.