Patents by Inventor James C. Stevens

James C. Stevens has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Publication number: 20250092762
    Abstract: A perf wash cement (“P/W/C”) abandonment job is conducted in an offshore oil or gas well annulus (2), in particular the washing or cementing operation using a rotating head (6, 8) with nozzles (7, 9) dispensing wash fluid or cement at pressure. Certain values of parameters of a washing or cementing job have been found surprisingly to affect the quality of the job, or the degree to which they affect the quality of the job has been unexpected. These include rotation rate of the tool, the direction of translational movement of the tool, and the volume flow rate and pressure per nozzle of cement or wash fluid (and hence nozzle size).
    Type: Application
    Filed: December 5, 2024
    Publication date: March 20, 2025
    Inventors: Rick Watts, Stein Haavardstein, Lars Hovda, James C. Stevens, Dan Mueller, Brett Borland, Amal Phadke, Praveen Gonuguntla
  • Patent number: 12196062
    Abstract: The invention relates to a method of conducting a perf wash cement (“P/W/C”) abandonment job in an offshore oil or gas well annulus (2), in particular the washing or cementing operation using a rotating head (6, 8) with nozzles (7, 9) dispensing wash fluid or cement at pressure. Certain values of parameters of a washing or cementing job have been found surprisingly to affect the quality of the job, or the degree to which they affect the quality of the job has been unexpected. These include including rotation rate of the tool, the direction of translational movement of the tool, and the volume flow rate and pressure per nozzle of cement or wash fluid (and hence nozzle size).
    Type: Grant
    Filed: March 2, 2023
    Date of Patent: January 14, 2025
    Assignee: CONOCOPHILLIPS COMPANY
    Inventors: Rick Watts, Stein Haavardstein, Lars Hovda, James C. Stevens, Dan Mueller, Brett Borland, Amal Phadke, Praveen Gonuguntla
  • Patent number: 12139997
    Abstract: The invention relates to a method of conducting a perf wash cement (“P/W/C”) abandonment job in an offshore oil or gas well annulus, in particular the washing or cementing operation using a rotating head with nozzles dispensing wash fluid or cement at pressure. A new design of bottom hole assembly is proposed in which the cementing tool has a relatively large diameter in order to optimize pressure whilst the wash tool has a relatively small diameter. The wash process, for a number of reasons, appears to be less sensitive to tool diameter and making the wash tool smaller reduces the overall risk of stuck pipe.
    Type: Grant
    Filed: May 11, 2023
    Date of Patent: November 12, 2024
    Assignee: CONOCOPHILLIPS COMPANY
    Inventors: Lars Hovda, Dan Mueller, James C. Stevens, Amal Phadke, Praveen Gonuguntla
  • Patent number: 12123279
    Abstract: The invention relates to a cementing tool (1) and method for setting a cement plug. Instead of the conventional “balanced plug”, the technique involves pumping cement whilst pulling and rotating the tool. The cementing tool (1) includes nozzles (9) for jetting cement which are located in a relatively narrow region (8) of the tool and a larger diameter choke region (5) proximal of the nozzles (9). The end of the tool (11) is closed off and tapered. The tool is passed down the well to a location where it is desired to set a plug, then cement is injected whilst rotating and withdrawing the tool. The jets of cement help displace existing fluid in the well thereby reducing mixing of the existing fluid with the cement, The choke region (5) increases the flow energy, whilst the tapered end (11) helps prevent disruption to the cement as the tool is withdrawn.
    Type: Grant
    Filed: August 19, 2021
    Date of Patent: October 22, 2024
    Assignee: CONOCOPHILLIPS COMPANY
    Inventors: Lars Hovda, Dan Mueller, James C. Stevens, Amal Phadke
  • Patent number: 11879305
    Abstract: The invention relates to a cementing tool for use in oil and gas well decommissioning operations, in particular so called perforate, wash and cement procedures. The tool (1) is designed for running in a well on drill string and for jetting cement through previously formed perforations in the casing (10) to fill the outer annulus (9) with cement. The tool (1) has a cylindrical wall (3) which is formed from steel (11) and elastomeric (5) elements, whereby it is expandable between a first diameter in which it may be run down the well and a second, larger diameter deployed during cementing operations.
    Type: Grant
    Filed: August 19, 2021
    Date of Patent: January 23, 2024
    Assignee: CONOCOPHILLIPS COMPANY
    Inventors: Lars Hovda, James C. Stevens, Dan Mueller, Amal Phadke, Praveen Gonuguntla
  • Patent number: 11686175
    Abstract: The invention relates to a method of conducting a perf wash cement (“P/W/C”) abandonment job in an offshore oil or gas well annulus, in particular the washing or cementing operation using a rotating head with nozzles dispensing wash fluid or cement at pressure. A new design of bottom hole assembly is proposed in which the cementing tool has a relatively large diameter in order to optimize pressure whilst the wash tool has a relatively small diameter. The wash process, for a number of reasons, appears to be less sensitive to tool diameter and making the wash tool smaller reduces the overall risk of stuck pipe.
    Type: Grant
    Filed: August 19, 2021
    Date of Patent: June 27, 2023
    Assignee: CONOCOPHILLIPS COMPANY
    Inventors: Lars Hovda, Dan Mueller, James C. Stevens, Amal Phadke, Praveen Gonuguntla
  • Patent number: 11608718
    Abstract: The invention relates to a method of conducting a perf wash cement (“P/W/C”) abandonment job in an offshore oil or gas well annulus (2), in particular the washing or cementing operation using a rotating head (6, 8) with nozzles (7, 9) dispensing wash fluid or cement at pressure. Certain values of parameters of a washing or cementing job have been found surprisingly to affect the quality of the job, or the degree to which they affect the quality of the job has been unexpected. These include including rotation rate of the tool, the direction of translational movement of the tool, and the volume flow rate and pressure per nozzle of cement or wash fluid (and hence nozzle size).
    Type: Grant
    Filed: August 31, 2021
    Date of Patent: March 21, 2023
    Assignee: CONOCOPHILLIPS COMPANY
    Inventors: Rick Watts, Stein Haavardstein, Lars Hovda, James C. Stevens, Dan Mueller, Brett Borland, Amal Phadke, Praveen Gonuguntla
  • Patent number: 11136862
    Abstract: The invention relates to a method of conducting a perf wash cement (“P/W/C”) abandonment job in an offshore oil or gas well annulus (2), in particular the washing or cementing operation using a rotating head (6, 8) with nozzles (7, 9) dispensing wash fluid or cement at pressure. Certain values of parameters of a washing or cementing job have been found surprisingly to affect the quality of the job, or the degree to which they affect the quality of the job has been unexpected. These include including rotation rate of the tool, the direction of translational movement of the tool, and the volume flow rate and pressure per nozzle of cement or wash fluid (and hence nozzle size).
    Type: Grant
    Filed: August 2, 2019
    Date of Patent: October 5, 2021
    Assignee: CONOCOPHILLIPS COMPANY
    Inventors: Rick Watts, Stein Haavardstein, Lars Hovda, James C. Stevens, Dan Mueller, Brett Borland, Amal Phadke, Praveen Gonuguntla
  • Publication number: 20170012157
    Abstract: A light splitting optical module that converts incident light into electrical energy, the module including a solid optical element comprising an input end for receiving light, a first side, and a second side spaced from the first side, a first solar cell adjacent to the first side of the solid optical element, and a second solar cell adjacent to the second side of the solid optical element. The first solar cell is positioned to absorb a first subset of incident light and reflect a first remainder of the incident light to the second solar cell through the solid optical element, wherein the first solar cell has a lower band gap than the second cell.
    Type: Application
    Filed: December 22, 2014
    Publication date: January 12, 2017
    Inventors: Carissa Eisler, Weijun Zhou, Emily D. Kosten, Emily C. Warmann, Carrie E. Hofmann, Harry A. Atwater, Rebekah K. Feist, James C. Stevens
  • Patent number: 9243090
    Abstract: A composition for use in forming a multi-block copolymer, said copolymer containing therein two or more segments or blocks differing in chemical or physical properties, a polymerization process using the same, and the resulting polymers, wherein the composition comprises the admixture or reaction product resulting from combining: (A) a first metal complex olefin polymerization catalyst, (B) a second metal complex olefin polymerization catalyst capable of preparing polymers differing in chemical or physical properties from the polymer prepared by catalyst (A) under equivalent polymerization conditions, and (C) a chain shuttling agent.
    Type: Grant
    Filed: May 15, 2014
    Date of Patent: January 26, 2016
    Assignee: Dow Global Technologies LLC
    Inventors: Daniel J. Arriola, Edmund M. Carnahan, Yunwa Wilson Cheung, David D. Devore, David D. Graf, Phillip D. Hustad, Roger L. Kuhlman, Colin Li Pi Shan, Benjamin C. Poon, Gordon R. Roof, James C. Stevens, Pamela J. Stirn, Timothy T. Wenzel
  • Publication number: 20150287842
    Abstract: A photovoltaic system that converts incident light into electrical energy that includes a light trapping optical module having a light randomizing dielectric slab with a first surface and a second surface, a first cell adjacent to the first surface of the slab that has a bandgap of lower energy than the energy of absorption onset of the dielectric slab, at least one filter element in optical contact with the second surface of the dielectric slab, and a sub-cell array with a plurality of photovoltaic sub-cells, wherein at least one of the sub-cells has a first surface that is in optical contact with the at least one filter element.
    Type: Application
    Filed: August 30, 2013
    Publication date: October 8, 2015
    Inventors: Emily D. Kosten, Christofer A. Flowers, John V. Lloyd, Carrie E. Hofmann, Harry A. Atwater, Emily C. Warmann, James C. Stevens, Rebekah K. Feist, Weijun Zhou, Michael E. Mills, Narayan Ramesh
  • Publication number: 20150267032
    Abstract: A composition comprising a phase separated block copolymer and an inorganic dielectric nanoparticle, wherein the nanoparticle is dispersed in the copolymer and is present primarily in one phase. For example, a Ti02 nanocomposite can be created via the in situ formation of Ti02 within a silane-grafted OBC. Taking advantage of the phase morphology of the OBC and the differential swelling of the hard and soft segments, due to their inherent crystallinity, enables the selective incorporation of Ti02 nanoparticles into the soft segments of the OBC.
    Type: Application
    Filed: October 14, 2013
    Publication date: September 24, 2015
    Inventors: Phillip D. Hustad, Stephanie L. Potisek, Rebekah K. Feist, James C. Stevens, Michael E. Mills, Yuanqiao Rao, Eddy I. Garcia-Meitin
  • Publication number: 20150255637
    Abstract: The present invention provides strategies for improving the quality of the insulating layer in MIS and SIS devices in which the insulator layer interfaces with at least one pnictide-containing film The principles of the present invention are based at least in part on the discovery that very thin (20 nm or less) insulating films comprising a chalcogenide such as i-ZnS are surprisingly superior tunnel barriers in MIS and SIS devices incorporating pnictide semiconductors. In one aspect, the present invention relates to a photovoltaic device, comprising: a semiconductor region comprising at least one pnictide semiconductor; an insulating region electrically coupled to the semiconductor region, wherein the insulating region comprises at least one chalcogenide and has a thickness in the range from 0.5 nm to 20 nm; and a rectifying region electrically coupled to the semiconductor region in a manner such that the insulating region is electrically interposed between the collector region and the semiconductor region.
    Type: Application
    Filed: October 7, 2013
    Publication date: September 10, 2015
    Inventors: Jeffrey P. Bosco, Rebekah K. Feist, Harry A. Atwater, Marty W. Degroot, James C. Stevens, Gregory M. Kimball
  • Publication number: 20150221800
    Abstract: A light splitting optical module that converts incident light into electrical energy, the module including a solid optical element comprising an input end for receiving light, a first side, and a second side spaced from the first side, a first solar cell adjacent to the first side of the solid optical element, and a second solar cell adjacent to the second side of the solid optical element. The first solar cell is positioned to absorb a first subset of incident light and reflect a first remainder of the incident light to the second solar cell through the solid optical element.
    Type: Application
    Filed: August 30, 2013
    Publication date: August 6, 2015
    Inventors: Carissa N. Eisler, Emily D. Kosten, Harry A. Atwater, Emily C. Warmann, Carrie E. Hofmann, Rebekah K. Feist, James C. Stevens, Weijun Zhou, Michael E. Mills, Narayan Ramesh
  • Publication number: 20150207009
    Abstract: The present invention provides photovoltaic devices that comprise multiple bandgap cell arrays in combination with spectrum splitting optics. The spectrum splitting optics include one or more optical spectrum splitting modules that include two or more optical splitting, diffractive elements that are optically in series to successively and diffractively split incident light into segments or slices that are independently directed onto different photovoltaic cell(s) of the array having appropriate bandgap characteristics.
    Type: Application
    Filed: August 30, 2013
    Publication date: July 23, 2015
    Inventors: Matthew D. Escarra, Sunita Darbe, Harry A. Atwater, Rebekah K. Feist, Carrie E. Hofmann, Emily D. Kosten, Michael E. Mills, Narayan Ramesh, James C. Stevens
  • Patent number: 9034685
    Abstract: The present invention provides methods for making pnictide compositions, particularly photoactive and/or semiconductive pnictides. In many embodiments, these compositions are in the form of thin films grown on a wide range of suitable substrates to be incorporated into a wide range of microelectronic devices, including photovoltaic devices, photodetectors, light emitting diodes, betavoltaic devices, thermoelectric devices, transistors, other optoelectronic devices, and the like. As an overview, the present invention prepares these compositions from suitable source compounds in which a vapor flux is derived from a source compound in a first processing zone, the vapor flux is treated in a second processing zone distinct from the first processing zone, and then the treated vapor flux, optionally in combination with one or more other ingredients, is used to grow pnictide films on a suitable substrate.
    Type: Grant
    Filed: February 10, 2012
    Date of Patent: May 19, 2015
    Assignees: Dow Global Technologies LLC, California Institute of Technology
    Inventors: Gregory M. Kimball, Jeffrey P. Bosco, Harry A. Atwater, Nathan S. Lewis, Marty W. Degroot, James C. Stevens
  • Patent number: 8912426
    Abstract: The present invention is premised upon an improved photovoltaic device (“PV device”), more particularly to an improved photovoltaic device with a multilayered photovoltaic cell assembly and a body portion joined at an interface region.
    Type: Grant
    Filed: March 10, 2011
    Date of Patent: December 16, 2014
    Assignee: Dow Global Technologies LLC
    Inventors: Michael E. Mills, James R. Keenihan, Kevin D. Maak, Narayan Ramesh, Jason A. Reese, James C. Stevens, Samar R. Teli
  • Patent number: 8846991
    Abstract: The subject invention pertains to homogeneous liquid low molecular weight ethylene/alpha-olefin polymers having a number average molecular weight (Mn) as determined by gel permeation chromatography, of less than 25,000, a total crystallinity, as measured by DSC, of less than 10%, and a pour point, as measured by ASTM D97, of less than 50° C. The subject invention also pertains to homogeneous gel-like low molecular weight ethylene/alpha-olefin polymers having a number average molecular weight (Mn) as determined by gel permeation chromatography, of less than 25,000, a total crystallinity, as measured by DSC, of less than 50%, and a pour point, as measured by ASTM D97, of less than 90° C.
    Type: Grant
    Filed: June 17, 2010
    Date of Patent: September 30, 2014
    Assignee: Dow Global Technologies LLC
    Inventors: Teresa P. Karjala, Selim Yalvac, Thomas Karjala, Daniel D. VanderLende, Brian W. Kolthammer, James C. Stevens, Charles F. Diehl
  • Publication number: 20140249286
    Abstract: A composition for use in forming a multi-block copolymer, said copolymer containing therein two or more segments or blocks differing in chemical or physical properties, a polymerization process using the same, and the resulting polymers, wherein the composition comprises the admixture or reaction product resulting from combining: (A) a first metal complex olefin polymerization catalyst, (B) a second metal complex olefin polymerization catalyst capable of preparing polymers differing in chemical or physical properties from the polymer prepared by catalyst (A) under equivalent polymerization conditions, and (C) a chain shuttling agent.
    Type: Application
    Filed: May 15, 2014
    Publication date: September 4, 2014
    Applicant: Dow Global Technologies LLC
    Inventors: Daniel J. Arriola, Edmund M. Carnahan, Yunwa Wilson Cheung, David D. Devore, David D. Graf, Phillip D. Hustad, Roger L. Kuhlman, Colin Li Pi Shan, Benjamin C. Poon, Gordon R. Roof, James C. Stevens, Pamela J. Stirn, Timothy T. Wenzel
  • Patent number: 8785551
    Abstract: A composition for use in forming a multi-block copolymer, said copolymer containing therein two or more segments or blocks differing in chemical or physical properties, a polymerization process using the same, and the resulting polymers, wherein the composition comprises the admixture or reaction product resulting from combining: (A) a first metal complex olefin polymerization catalyst, (B) a second metal complex olefin polymerization catalyst capable of preparing polymers differing in chemical or physical properties from the polymer prepared by catalyst (A) under equivalent polymerization conditions, and (C) a chain shuttling agent.
    Type: Grant
    Filed: December 8, 2010
    Date of Patent: July 22, 2014
    Assignee: Dow Global Technologies LLC
    Inventors: Daniel J. Arriola, Edmund M. Carnahan, Yunwa Wilson Cheung, David D. Devore, David D. Graf, Phillip D. Hustad, Roger L. Kuhlman, Colin Li Pi Shan, Benjamin C. Poon, Gordon R. Roof, James C. Stevens, Pamela J. Stirn, Timothy T. Wenzel