Keith T Nelson

US Patent:

7521507, Apr 21, 2009

Filed:

Nov 24, 2003

Appl. No.:

10/720512

Inventors:

Kenneth Lewtas - Tervuren, BE
Sudhin Datta - Houston TX, US
Charles Cozewith - Bellaire TX, US
Bruce A. Harrington - Houston TX, US
David J. Lohse - Bridgewater NJ, US
Olivier J. F. Georjon - Brussels, BE
Anthony G. Karandinos - St. Stevens-Woluwe, BE
Keith A. Nelson - Baton Rouge LA, US
Jean M. Tancrede - Baton Rouge LA, US

Assignee:

ExxonMobil Chemical Patents Inc. - Houston TX

International Classification:

C08F 4/6192
C08F 4/6592
C08F 210/06
C08L 23/14

US Classification:

525 53, 525240, 526 65, 526160, 526170, 526348, 5263482

Abstract:

An adhesive blend is described that can include a semi-crystalline copolymer of propylene and at least one comonomer selected from the group consisting of ethylene and at least one Cto Cα-olefin, the copolymer having a weight average molecular weight (Mw) from about 15,000 to about 200,000; an melt index (MI) from about 7 dg/min to about 3000 dg/min as measured by ASTM D 1238(B), and a (Mw/Mn) of approximately 2. Various production processes are also described. Also described are adhesive compositions and methods for making adhesive compositions having polymers or polymer blends with melt flow rates (MFRs) equal to and above 250 dg/min. at 230 C. Certain specific embodiments of the invention involve the use of a free radical initiator, e. g. , a peroxide.

US Patent:

7524910, Apr 28, 2009

Filed:

Oct 15, 2003

Appl. No.:

10/686951

Inventors:

Peijun Jiang - League City TX, US
Keith Allen Nelson - Houston TX, US
Christopher Lewis Curry - Seabrook TX, US
Armenag Hagop Dekmezian - Kingwood TX, US
Charles Lewis Sims - Houston TX, US
Ramin Abhari - Friendswood TX, US
Cesar Alberto Garcia-Franco - Houston TX, US
Jo Ann Marie Canich - Houston TX, US
Nicolas Kappes - Brussels, BE
Michel Louis Faissat - Waterloo, BE
Lutz Erich Jacob - Tervuren, BE

Assignee:

ExxonMobil Chemical Patents Inc. - Houston TX

International Classification:

C08F 210/00

US Classification:

526348, 524570, 524582, 526351

Abstract:

Embodiments of the present invention relate to article comprising a polymer comprising one or more C3 to C40 olefins, optionally one or more diolefins, and less than 5 mole % of ethylene having a Dot T-Peel of 1 Newton or more, a branching index (g′) of 0. 95 or less measured at the Mz of the polymer; and an Mw of 100,000 or less. This invention further relates to a process to produce an olefin polymer comprising: 1) selecting a first catalyst component capable of producing a polymer having an Mw of 100,000 or less and a crystallinity of 20% or less; 2) selecting a second catalyst component capable of producing polymer having an Mw of 100,000 or less and a crystallinity of 40% or more; 3) contacting the catalyst components in the presence of one or more activators with one or more C3 to C40 olefins, in a reaction zone.

US Patent:

7775272, Aug 17, 2010

Filed:

Mar 14, 2007

Appl. No.:

11/686063

Inventors:

Keith Nelson - Sugar Land TX, US
Franz Aguirre - Missouri City TX, US

Assignee:

Schlumberger Technology Corporation - Sugar Land TX

International Classification:

E21B 17/10

US Classification:

1662416, 1662411, 166213

Abstract:

A passive centralizer for stably centering within a well. The centralizer may be of a retracted profile for advancement within the well and deployable for centralization upon reaching an operation site. Deployment may be achieved in an automated manner without the requirement of operator interaction therefor. Furthermore, the centralizer may be truly passive in that energy for deployment may be stored entirely within the passive centralizer prior to its insertion within the well. The passive centralizer may also be compressed following centralization by any number of downhole restrictions. In this manner the passive centralizer may also be readily withdrawn from the well.

US Patent:

8383731, Feb 26, 2013

Filed:

Feb 24, 2009

Appl. No.:

12/391286

Inventors:

Kenneth Lewtas - Tervuren, BE
Sudhin Datta - Houston TX, US
Charles Cozewith - Bellaire TX, US
Bruce A. Harrington - Houston TX, US
David J. Lohse - Bridgewater NJ, US
Olivier J. F. Georjon - Brussels, BE
Anthony G. Karandinos - St. Stevens-Woluwe, BE
Keith A. Nelson - Baton Rouge LA, US
Jean M. Tancrede - Baton Rouge LA, US

Assignee:

Exxonmobil Chemical Patents Inc. - Houston TX

International Classification:

C08L 23/16
C08L 23/30
C08L 23/14
C09J 123/14
C09J 123/16

US Classification:

525240, 525387, 526348, 5263482, 5263484, 5263486, 524499, 524502

Abstract:

An adhesive blend is described that can include a semi-crystalline copolymer of propylene and at least one comonomer selected from the group consisting of ethylene and at least one Cto Cα-olefin, the copolymer having a weight average molecular weight (Mw) from about 15,000 to about 200,000; an melt index (MI) from about 7 dg/min to about 3000 dg/min as measured by ASTM D 1238 (B), and a (Mw/Mn) of approximately 2. Various production processes are also described. Also described are adhesive compositions and methods for making adhesive compositions having polymers or polymer blends with melt flow rates (MFRS) equal to and above 250 dg/min. at 230C. Certain specific embodiments of the invention involve the use of a free radical initiator, e. g. , a peroxide.

US Patent:

D699267, Feb 11, 2014

Filed:

Dec 21, 2012

Appl. No.:

29/440416

Inventors:

Keith R. Nelson - Sugar Land TX, US

Assignee:

Schlumberger Technology Corporation - Sugar Land TX

International Classification:

1503

US Classification:

D15 21, D15 28

US Patent:

20080196901, Aug 21, 2008

Filed:

Nov 7, 2007

Appl. No.:

11/936320

Inventors:

Franz Aguirre - Missouri City TX, US
Todor K. Sheiretov - Houston TX, US
Keith R. Nelson - Sugar Land TX, US

International Classification:

E21B 4/00

US Classification:

166381, 175106

Abstract:

A downhole tractor assembly that is configured for open-hole applications and of a self-aligning nature. The self-aligning nature of the assembly is effectuated through a tractor portion which is rotable about an axis of an elongated body of the assembly independent of a separate centralizing portion of the assembly. That is, the tractor portion, configured for interfacing an open-hole well wall of potentially irregular morphology, is independently rotable so as to maintain a position of substantially optimized driving friction at the interface during tractoring. Maintenance of optimized driving friction in this manner may occur irrespective of the orientation of the centralizing portion of the assembly.

US Patent:

20090236101, Sep 24, 2009

Filed:

May 1, 2009

Appl. No.:

12/434108

Inventors:

Keith R. Nelson - Sugar Land TX, US
Gohar Saeed - Stafford TX, US
Franz Aguirre - Missouri City TX, US

International Classification:

E21B 23/00

US Classification:

166382, 166216

Abstract:

A downhole tractor assembly that is configured for open-hole applications. The assembly includes a force monitoring mechanism to help monitor and control forces imparted through a drive mechanism of the tractor in real time. As such, damage to open-hole formations due to excessive tractoring forces may be minimized along with mechanical damage to the tractor. Furthermore, the drive mechanism of the tractor may include multiple sondes and bowsprings with gripping saddles specially configured for contacting the well wall across a large area in a non-point and line manner so as to avoid digging into and damaging the well wall during tractoring.

US Patent:

20130255964, Oct 3, 2013

Filed:

Mar 30, 2012

Appl. No.:

13/435011

Inventors:

Brandon Martin - Katy TX, US
Douglas W. Grant - Cedar Creek TX, US
Keith R. Nelson - Sugar Land TX, US

International Classification:

E21B 23/00

US Classification:

166377, 294 861

Abstract:

A mechanism to enhance disengagement of release assembly portions from one another when disposed in a well. The mechanism may be disposed at an internal rod of the release assembly and configured to prevent frictional resistance to shifting of the rod. Thus, actuation of release may be assured, for example, in spite of any axial pull on the assembly which may tend to direct radial forces on the rod. As such, controlled separation of release assembly portions may be assured so as to aid in removal of a line coupled to the assembly from the well.