Patents by Inventor B. Raghava Reddy

B. Raghava Reddy 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).

  • Methods for improving the distribution of a sealant composition in a wellbore and treatment fluids providing the same
    Patent number: 10174241
    Abstract: Methods for forming a fluid seal in a subterranean formation may comprise: providing a treatment fluid comprising an aqueous carrier fluid, a sealant composition, and a crosslinked polysaccharide composition. The treatment fluid is introduced into a wellbore penetrating a subterranean formation and the crosslinked polysaccharide composition is formed into a viscosified gel in the wellbore. The viscosified gel substantially spans the diameter of the wellbore and holds the sealant composition in place. After forming the crosslinked polysaccharide composition into a viscosified gel in the wellbore, forming a fluid seal in the wellbore with the sealant composition.
    Type: Grant
    Filed: February 18, 2014
    Date of Patent: January 8, 2019
    Assignee: Halliburton Energy Services, Inc.
    Inventors: Larry Steven Eoff, B. Raghava Reddy, Natalie Pascarella, Amare Mebratu
  • Loss circulation compositions (LCM) having portland cement clinker
    Patent number: 10167420
    Abstract: Portland cement clinker LCMs that include Portland cement clinker to mitigate or prevent lost circulation in a well are provided. A Portland cement clinker LCM may include Portland cement clinker, Portland cement, a carrier fluid, and an inorganic consolidation activator. Another Portland cement clinker LCM may include Portland cement clinker and a crosslinked fluid, such as a polyuronide crosslinked via calcium ions or a polysaccharide crosslinked via divinyl sulfone. Yet another Portland cement clinker LCM may include Portland cement clinker and polymer fibers or particulate glass. Methods of lost circulation control using a Portland cement clinker LCM are also provided.
    Type: Grant
    Filed: October 19, 2017
    Date of Patent: January 1, 2019
    Assignee: SAUDI ARABIAN OIL COMPANY
    Inventor: B. Raghava Reddy
  • Oil-swellable, desolvated polymer gels and methods of using the same for preventing loss of non-aqueous wellbore fluids to the subterranean formation
    Patent number: 10160901
    Abstract: An oil-swellable gel lost circulation material (LCM) formed from an elastomeric polymer and a crosslinker amine is provided. The LCM may include gel pieces cut from gel strands formed from an elastomeric polymer and a crosslinker amine. The oil-swellable gel LCM composition may be formed by mixing an elastomeric polymer solution with a crosslinker amine and heating the mixture to form a crosslinked gel. The gel may be extruded through a die having orifices into a non-solvent and allowed to desolvate in the presence of the non-solvent. The gel strands may be dried and cut into gel pieces to form an LCM. The resulting LCM may swell when introduced to a loss circulation zone in the presence of a non-aqueous fluid such as a drilling mud or component of a drilling mud.
    Type: Grant
    Filed: April 26, 2018
    Date of Patent: December 25, 2018
    Assignee: Saudi Arabian Upstream Technology Company
    Inventors: B. Raghava Reddy, Matthew Hilfiger
  • Maleic anhydride polymers and methods of treating subterranean formations
    Patent number: 10160902
    Abstract: This document relates to compositions including a maleic anhydride copolymer or a salt thereof and an amine crosslinker. The maleic anhydride copolymer includes repeat units I and II: Each R1 is independently selected from the group consisting of —H, —O(C1-C5)alkyl, and —(C1-C5)alkyl. Each R2 is independently selected from the group consisting of —H, —O(C1-C5)alkyl, and —(C1-C5)alkyl.
    Type: Grant
    Filed: September 13, 2016
    Date of Patent: December 25, 2018
    Assignee: Saudi Arabian Oil Company
    Inventor: B. Raghava Reddy
  • System and method for collecting a representative formation fluid during downhole testing operations
    Patent number: 10156138
    Abstract: A method for collecting a formation fluid for testing includes introducing a formation sample tool having a first port and a second port into a wellbore. A first fluid is injected through the first port into the formation to clear a sample passage and allow access to uncontaminated formation fluid. A second fluid is injected through the second port into the formation to provide a barrier adjacent to or around the sample passage. A sample of the uncontaminated formation fluid is removed from the formation through the first port.
    Type: Grant
    Filed: January 3, 2013
    Date of Patent: December 18, 2018
    Assignee: Halliburton Energy Services, Inc.
    Inventors: Cyrus A. Irani, B. Raghava Reddy
  • Oil-swellable, desolvated polymer gels and methods of using the same for preventing loss of non-aqueous wellbore fluids to the subterranean formation
    Patent number: 10155898
    Abstract: An oil-swellable gel lost circulation material (LCM) formed from an elastomeric polymer and a crosslinker amine is provided. The LCM may include gel pieces cut from gel strands formed from an elastomeric polymer and a crosslinker amine. The oil-swellable gel LCM composition may be formed by mixing an elastomeric polymer solution with a crosslinker amine and heating the mixture to form a crosslinked gel. The gel may be extruded through a die having orifices into a non-solvent and allowed to desolvate in the presence of the non-solvent. The gel strands may be dried and cut into gel pieces to form an LCM. The resulting LCM may swell when introduced to a loss circulation zone in the presence of a non-aqueous fluid such as a drilling mud or component of a drilling mud.
    Type: Grant
    Filed: April 26, 2018
    Date of Patent: December 18, 2018
    Assignee: Saudi Arabian Upstream Technology Company
    Inventors: B. Raghava Reddy, Matthew Hilfiger
  • Settable, form-filling loss circulation control compositions comprising in situ foamed non-hydraulic sorel cement systems and method of use
    Patent number: 10150905
    Abstract: This document relates to settable, non-hydraulic foamed cement compositions comprising nitrogen gas-generating compositions used for loss circulation control.
    Type: Grant
    Filed: January 24, 2018
    Date of Patent: December 11, 2018
    Assignee: Saudi Arabian Oil Company
    Inventor: B. Raghava Reddy
  • Loss circulation compositions (LCM) having Portland cement clinker
    Patent number: 10144859
    Abstract: Portland cement clinker LCMs that include Portland cement clinker to mitigate or prevent lost circulation in a well are provided. A Portland cement clinker LCM may include Portland cement clinker, Portland cement, a carrier fluid, and an inorganic consolidation activator. Another Portland cement clinker LCM may include Portland cement clinker and a crosslinked fluid, such as a polyuronide crosslinked via calcium ions or a polysaccharide crosslinked via divinyl sulfone. Yet another Portland cement clinker LCM may include Portland cement clinker and polymer fibers or particulate glass. Methods of lost circulation control using a Portland cement clinker LCM are also provided.
    Type: Grant
    Filed: October 19, 2017
    Date of Patent: December 4, 2018
    Assignee: SAUDI ARABIAN OIL COMPANY
    Inventor: B. Raghava Reddy
  • High temperature crosslinked fracturing fluids
    Patent number: 10144866
    Abstract: A fracturing fluid including a mixture of an aqueous copolymer composition including a copolymer, the copolymer having 2-acrylamido-2-methylpropanesulfonic acid, acrylamide, and acrylic acid monomer units, or a salt thereof, and a crosslinker. The crosslinker includes a metal, and the weight ratio of the metal to the copolymer is in a range of 0.01 to 0.08. Treating a subterranean formation includes introducing the fracturing fluid into a subterranean formation, and crosslinking the fracturing fluid in the subterranean formation to yield a crosslinked fracturing fluid. The crosslinked fracturing fluid has a viscosity of at least 500 cP for at least 80 minutes when the gel is subjected to a shear rate of 40 s?1 at a temperature in a range of 300° F. to 400° F.
    Type: Grant
    Filed: December 1, 2016
    Date of Patent: December 4, 2018
    Assignee: Saudi Arabian Oil Company
    Inventors: Feng Liang, B. Raghava Reddy, Leiming Li, Ghaithan Al-Muntasheri
  • Loss circulation compositions (LCM) having portland cement clinker
    Patent number: 10144860
    Abstract: Portland cement clinker LCMs that include Portland cement clinker to mitigate or prevent lost circulation in a well are provided. A Portland cement clinker LCM may include Portland cement clinker, Portland cement, a carrier fluid, and an inorganic consolidation activator. Another Portland cement clinker LCM may include Portland cement clinker and a crosslinked fluid, such as a polyuronide crosslinked via calcium ions or a polysaccharide crosslinked via divinyl sulfone. Yet another Portland cement clinker LCM may include Portland cement clinker and polymer fibers or particulate glass. Methods of lost circulation control using a Portland cement clinker LCM are also provided.
    Type: Grant
    Filed: October 19, 2017
    Date of Patent: December 4, 2018
    Assignee: Saudi Arabian Oil Company
    Inventor: B. Raghava Reddy
  • Oil-Swellable, Surface-Treated Elastomeric Polymer and Methods of Using the Same for Controlling Losses of Non-Aqueous Wellbore Treatment Fluids to the Subterranean Formation
    Publication number: 20180334867
    Abstract: An oil-swellable lost circulation material (LCM) formed from an elastomeric polymer and a crosslinker amine is provided. The LCM may be formed from elastomeric polymer particles, a crosslinker amine, an anti-agglomerating agent, and may also be formed using a cure accelerator. A mixture of the elastomeric polymer particles, the crosslinker amine, the anti-agglomerating agent, and in some mixtures the cure accelerator, may be hot rolled at a temperature of at least 120° F. for a duration. The resulting LCM may swell by absorbing about 20 to about 34 times its weight when introduced to a loss circulation zone in the presence of a non-aqueous fluid such as a drilling mud or component of a drilling mud.
    Type: Application
    Filed: May 1, 2018
    Publication date: November 22, 2018
    Inventor: B. Raghava Reddy
  • Oil-Swellable, Desolvated Polymer Gels and Methods of Using the Same for Preventing Loss of Non-Aqueous Wellbore Fluids to the Subterranean Formation
    Publication number: 20180334608
    Abstract: An oil-swellable gel lost circulation material (LCM) formed from an elastomeric polymer and a crosslinker amine is provided. The LCM may include gel pieces cut from gel strands formed from an elastomeric polymer and a crosslinker amine. The oil-swellable gel LCM composition may be formed by mixing an elastomeric polymer solution with a crosslinker amine and heating the mixture to form a crosslinked gel. The gel may be extruded through a die having orifices into a non-solvent and allowed to desolvate in the presence of the non-solvent. The gel strands may be dried and cut into gel pieces to form an LCM. The resulting LCM may swell when introduced to a loss circulation zone in the presence of a non-aqueous fluid such as a drilling mud or component of a drilling mud.
    Type: Application
    Filed: April 26, 2018
    Publication date: November 22, 2018
    Inventors: B. Raghava Reddy, Matthew Hilfiger
  • Oil-Swellable, Desolvated Polymer Gels and Methods of Using the Same for Preventing Loss of Non-Aqueous Wellbore Fluids to the Subterranean Formation
    Publication number: 20180334609
    Abstract: An oil-swellable gel lost circulation material (LCM) formed from an elastomeric polymer and a crosslinker amine is provided. The LCM may include gel pieces cut from gel strands formed from an elastomeric polymer and a crosslinker amine. The oil-swellable gel LCM composition may be formed by mixing an elastomeric polymer solution with a crosslinker amine and heating the mixture to form a crosslinked gel. The gel may be extruded through a die having orifices into a non-solvent and allowed to desolvate in the presence of the non-solvent. The gel strands may be dried and cut into gel pieces to form an LCM. The resulting LCM may swell when introduced to a loss circulation zone in the presence of a non-aqueous fluid such as a drilling mud or component of a drilling mud.
    Type: Application
    Filed: April 26, 2018
    Publication date: November 22, 2018
    Inventors: B. Raghava Reddy, Matthew Hilfiger
  • Oil-Swellable, Surface-Treated Elastomeric Polymer and Methods of Using the Same for Controlling Losses of Non-Aqueous Wellbore Treatment Fluids to the Subterranean Formation
    Publication number: 20180334868
    Abstract: An oil-swellable lost circulation material (LCM) formed from an elastomeric polymer and a crosslinker amine is provided. The LCM may be formed from elastomeric polymer particles, a crosslinker amine, an anti-agglomerating agent, and may also be formed using a cure accelerator. A mixture of the elastomeric polymer particles, the crosslinker amine, the anti-agglomerating agent, and in some mixtures the cure accelerator, may be hot rolled at a temperature of at least 120° F. for a duration. The resulting LCM may swell by absorbing about 20 to about 34 times its weight when introduced to a loss circulation zone in the presence of a non-aqueous fluid such as a drilling mud or component of a drilling mud.
    Type: Application
    Filed: May 1, 2018
    Publication date: November 22, 2018
    Inventor: B. Raghava Reddy
  • Oil-Swellable, Surface-Treated Elastomeric Polymer and Methods of Using the Same for Controlling Losses of Non-Aqueous Wellbore Treatment Fluids to the Subterranean Formation
    Publication number: 20180334866
    Abstract: An oil-swellable lost circulation material (LCM) formed from an elastomeric polymer and a crosslinker amine is provided. The LCM may be formed from elastomeric polymer particles, a crosslinker amine, an anti-agglomerating agent, and may also be formed using a cure accelerator. A mixture of the elastomeric polymer particles, the crosslinker amine, the anti-agglomerating agent, and in some mixtures the cure accelerator, may be hot rolled at a temperature of at least 120 ° F. for a duration. The resulting LCM may swell by absorbing about 20 to about 34 times its weight when introduced to a loss circulation zone in the presence of a non-aqueous fluid such as a drilling mud or component of a drilling mud.
    Type: Application
    Filed: December 1, 2017
    Publication date: November 22, 2018
    Inventor: B. Raghava Reddy
  • N-hydroxyalkylated polyamines, methods of making N-hydroxyalkylated polyamines, and fluids containing an N-hydroxyalkylated polyamine
    Patent number: 10131622
    Abstract: N-hydroxyalkylated polyamines, methods of making N-hydroxyalkylated polyamines, and drilling fluids containing N-hydroxyalkylated polyamines are provided, in which the N-hydroxyalkylated polyamine includes Formula (I): where R1 and R2 are independently a —C or —CH group; R3 is an aliphatic hydrocarbyl; R4 and R5 are independently acyclic hydrocarbyls, or R1, R2, R4, and R5 are covalently connected to form a cyclic hydrocarbyl; and R6, R7, R8, and R9 are independently acyclic hydrocarbyls or acyclic heterohydrocarbyls.
    Type: Grant
    Filed: January 3, 2018
    Date of Patent: November 20, 2018
    Assignee: Saudi Arabian Upstream Technology Company
    Inventors: Matthew Hilfiger, B. Raghava Reddy
  • Self-suspending proppants for use in carbon dioxide-based fracturing fluids and methods of making and use thereof
    Patent number: 10131832
    Abstract: Self-suspending proppants including proppant particles coated with a CO2-philic coating are provided. The CO2-philic coating may be lightly crosslinked and may have a physical structure that constrains CO2 molecules. Methods of making self-suspending proppants may include coating a proppant particle with a polymerizable precursor material of a CO2-philic material and polymerizing the polymerizable precursor material to form a self-suspending proppant are also provided. Additionally, hydraulic fracturing fluids that may include a CO2-based fluid and the self-suspending proppants and methods of treating subterranean formations by contacting a subterranean formation with hydraulic fracturing fluid and propagating at least one subterranean fracture are provided.
    Type: Grant
    Filed: September 12, 2017
    Date of Patent: November 20, 2018
    Assignees: Aramco Services Company, Research Foundation of The City University of New York
    Inventors: Feng Liang, Ghaithan A. Al-Muntasheri, Leiming Li, B. Raghava Reddy, George John, Vidyasagar Adiyala
  • Self-suspending modified proppant system for carbon dioxide based fracturing fluids
    Patent number: 10131834
    Abstract: Self-suspending proppants including proppant particles coated with a CO2-philic coating are provided. The CO2-philic coating may be lightly crosslinked and may have a physical structure that constrains CO2 molecules. Methods of making self-suspending proppants may include coating a proppant particle with a polymerizable precursor material of a CO2-philic material and polymerizing the polymerizable precursor material to form a self-suspending proppant are also provided. Additionally, hydraulic fracturing fluids that may include a CO2-based fluid and the self-suspending proppants and methods of treating subterranean formations by contacting a subterranean formation with hydraulic fracturing fluid and propagating at least one subterranean fracture are provided.
    Type: Grant
    Filed: March 15, 2018
    Date of Patent: November 20, 2018
    Assignees: Aramco Services Company, Research Foundation of The City University of New York
    Inventors: Feng Liang, Ghaithan A. Al-Muntasheri, Leiming Li, B. Raghava Reddy, George John, Vidyasagar Adiyala
  • Elastomer-thermally conductive carbon fiber compositions for roller-cone drill bit seals
    Patent number: 10132120
    Abstract: The present disclosure relates to elastomer-thermally conductive carbon fiber compositions for use in seals for roller-cone drill bits. The present disclosure further relates to seals formed from such compositions and to roller-cone drill bits containing such seals.
    Type: Grant
    Filed: September 19, 2014
    Date of Patent: November 20, 2018
    Assignee: Halliburton Energy Services, Inc.
    Inventors: B. Raghava Reddy, Feng Liang, Ping C. Sui, David P. Duckworth
  • Self-suspending modified proppant system for carbon dioxide based fracturing fluids
    Patent number: 10131833
    Abstract: Self-suspending proppants including proppant particles coated with a CO2-philic coating are provided. The CO2-philic coating may be lightly crosslinked and may have a physical structure that constrains CO2 molecules. Methods of making self-suspending proppants may include coating a proppant particle with a polymerizable precursor material of a CO2-philic material and polymerizing the polymerizable precursor material to form a self-suspending proppant are also provided. Additionally, hydraulic fracturing fluids that may include a CO2-based fluid and the self-suspending proppants and methods of treating subterranean formations by contacting a subterranean formation with hydraulic fracturing fluid and propagating at least one subterranean fracture are provided.
    Type: Grant
    Filed: March 15, 2018
    Date of Patent: November 20, 2018
    Assignees: Aramco Services Company, Research Foundation of The City of New York
    Inventors: Feng Liang, Ghaithan A. Al-Muntasheri, Leiming Li, B. Raghava Reddy, George John, Vidyasagar Adiyala