Patents by Inventor Arlynn H. Hartfiel

Arlynn H. Hartfiel 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).

  • Clay-free, thixotropic wellbore fluid
    Patent number: 4247402
    Abstract: A clay-free wellbore fluid having thixotropic properties, good surface handling characteristics and excellent subterranean characteristics such as particle handling gel strength, and low water loss has been devised by the combination of a heteropolysaccharide prepared by the action of bacteria of the genus Xanthomonas on carbohydrates, modified starch and MgO. In some situations a salt of lignosulfonate is added to maintain the desirable properties of the wellbore fluid.
    Type: Grant
    Filed: March 13, 1978
    Date of Patent: January 27, 1981
    Assignee: Brinadd Company
    Inventor: Arlynn H. Hartfiel
  • Clay-free, thixotropic wellbore fluid
    Patent number: 4098700
    Abstract: A clay-free wellbore fluid having thixotropic properties, good surface handling characteristics and excellent subterranean characteristics such as particle handling gel strength, and low water loss has been devised by the combination of a heteropolysaccharide prepared by the action of bacteria of the genus Xanthomonas on carbohydrates, modified starch and MgO. In some situations a salt of lignosulfonate is added to maintain the desirable properties of the wellbore fluid.
    Type: Grant
    Filed: September 25, 1975
    Date of Patent: July 4, 1978
    Assignee: Chemical Additives Company
    Inventor: Arlynn H. Hartfiel
  • Water loss reduction agents
    Patent number: 4090968
    Abstract: Starch derivatives have been found to be effective water loss control additives in clay-free wellbore fluids. Generally the starch derivatives are starch ethers, starch esters and partially oxidized starch. The starch derivatives can be added to the wellbore fluid in either the gelatinized or ungelatinized form. Unlike ordinary unmodified starch, the starch derivatives are soluble in acids, stable in the presence of calcium chloride, do not undergo retrogradation and are stable at higher temperatures than unmodified starch.
    Type: Grant
    Filed: June 7, 1976
    Date of Patent: May 23, 1978
    Assignee: Chemical Additives Company
    Inventors: Jack M. Jackson, Arlynn H. Hartfiel
  • Water loss reduction agents
    Patent number: 4003838
    Abstract: Starch derivatives have been found to be effective water loss control additives in clay-free wellbore fluids. Generally the starch derivatives are starch ethers, starch esters and partially oxidized starch. The starch derivatives can be added to the wellbore fluid in either the gelatinized or ungelatinized form. Unlike ordinary unmodified starch, the starch derivatives are soluble in acids, stable in the presence of calcium chloride, do not undergo retrogradation and are stable at higher temperatures than unmodified starch.
    Type: Grant
    Filed: October 3, 1975
    Date of Patent: January 18, 1977
    Assignee: Chemical Additives Company
    Inventors: Jack M. Jackson, Arlynn H. Hartfiel
  • Water loss reduction agents
    Patent number: 3993570
    Abstract: Starch derivatives have been found to be effective water loss control additives in clay-free wellbore fluids. Generally the starch derivatives are starch ethers, starch esters and partially oxidized starch. The starch derivatives can be added to the wellbore fluid in either the gelatinized or ungelatinized form. Unlike ordinary unmodified starch, the starch derivatives are soluble in acids, stable in the presence of calcium chloride, do not undergo retrogradation and are stable at higher temperatures than unmodified starch.
    Type: Grant
    Filed: July 14, 1975
    Date of Patent: November 23, 1976
    Assignee: Chemical Additives Company
    Inventors: Jack M. Jackson, Arlynn H. Hartfiel
  • Clay-free thixotropic wellbore fluid
    Patent number: 3988246
    Abstract: A clay-free wellbore fluid having thixotropic properties, good surface handling characteristics and excellent subterranean characteristics such as particle handling gel strength, and low water loss has been devised by the combination of a heteropolysaccharide prepared by the action of bacteria of the genus Xanthomonas on carbohydrates, modified starch and MgO. In some situations a salt of lignosulfonate is added to maintain the desirable properties of the wellbore fluid.
    Type: Grant
    Filed: May 24, 1974
    Date of Patent: October 26, 1976
    Assignee: Chemical Additives Company
    Inventor: Arlynn H. Hartfiel