Patents by Inventor Jon B. Christensen

Jon B. Christensen 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).

  • Patent number: 4883123
    Abstract: An above packer perforate, test and sample tool for use in obtaining a sample of fluid from a formation reservoir in a well. The apparatus includes a sampler and an actuator cylinder positioned above a packer and a valve body below the packer. An operating mandrel opens a valve below the packer to flow the fluid from a well annulus defined below the packer to a sampling chamber in the sampler above the packer. The operating mandrel is moved in response to a pressure differential between the pressure in the well annulus above the packer and a pressure in the tool. In another embodiment, a second packer may be positioned below the first packer to sealingly engage the well bore below the well formation. A method of sampling fluid from a well formation is also disclosed.
    Type: Grant
    Filed: November 23, 1988
    Date of Patent: November 28, 1989
    Assignee: Halliburton Company
    Inventors: Gary D. Zunkel, H. Kent Beck, Jon B. Christensen
  • Patent number: 4878538
    Abstract: A perforate, test and sample tool for obtaining fluid samples from a formation reservoir in a well. The tool comprises a retrievable packer, perforating guns and a sampler disposed between the packer and guns which is adapted for entrapping a fluid sample without flowing well fluids into the tool string. An operating position is slidably disposed in a cylinder above the packer and is used to actuate a sampler valve in the sampler. A seal insures that all portions of a sampling chamber in the sampler are disposed below the packer. In one embodiment, the operating piston is actuated in response to a pressure differential between a well annulus above the packer and an internal pressure in the tool. The sampler includes a plurality of sampler modules disposed in the sampling chamber. Each of the sampler modules includes a valve which automatically closes after a predetermined volume of fluid fills a sampler module chamber defined in the sampler module.
    Type: Grant
    Filed: February 15, 1989
    Date of Patent: November 7, 1989
    Assignee: Halliburton Company
    Inventor: Jon B. Christensen
  • Patent number: 4787447
    Abstract: A well fluid sampling apparatus for sampling fluids from a formation reservoir in a wall. The sampling apparatus comprises a body portion defining a large sampling chamber therein and at least one sampler module disposed in the sampling chamber. The sampler module is adapted for separately entrapping a volume of fluid as the sampling chamber fills. A sliding sampler valve is moved to open a sampler port allowing formation fluid to enter the sampling chamber. The sampler module has a metering piston therein which automatically closes after a predetermined volume of fluid has entered a sampler module chamber defined in the sampler module. The metering is accomplished by a chamber filled with a viscous liquid which must be discharged through a small orifice as the piston moves in response to fluid pressure in the sampling chamber. The viscous fluid is discharged into an air chamber.
    Type: Grant
    Filed: June 19, 1987
    Date of Patent: November 29, 1988
    Assignee: Halliburton Company
    Inventor: Jon B. Christensen
  • Patent number: 4756364
    Abstract: A packer bypass for use between a pump and packer in a testing string for venting said pump and packer to a well annulus after completion of a testing operation. The packer bypass comprises a case with an inner flow tube disposed therein such that an annular passageway is defined therebetween. A piston having a lower portion is reciprocably disposed in the annular passageway. A plurality of latching fingers are pivotally mounted to the lower end of the piston and biased towards a latching position. A bypassing mandrel is reciprocably disposed in the annular passageway below the piston and has an open position for bypassing pump pressure thereabove and packer pressure therebelow to the well annulus and also has a closed position in which bypassing is prevented. The mandrel may be raised from the closed position to the open position by lowering the piston and engaging the latching fingers with a flange on the mandrel.
    Type: Grant
    Filed: December 10, 1986
    Date of Patent: July 12, 1988
    Assignee: Halliburton Company
    Inventors: Jon B. Christensen, Harold K. Beck, Vincent P. Zeller
  • Patent number: 4749037
    Abstract: A string bypass for bypassing fluid around a packer as a testing string is lowered into or raised out of a well bore. The string bypass includes an outer case with an inner mandrel positioned therein such that an annular cavity is defined therebetween. A reciprocating piston is positioned in the annular cavity. The case and mandrel both define transverse holes therethrough, and the piston includes a transverse passageway which provides intercommunication between the holes when the piston is in an open position. A spring biases the piston toward the open position. A pump is used to inflate the packer, and, as the pump pressure gradually increases, a differential between the pump pressure and well annulus pressure acts against an annular area on the piston and overcomes the spring force so that the piston is moved to a sealed, closed position in which communication between the holes is prevented.
    Type: Grant
    Filed: October 22, 1986
    Date of Patent: June 7, 1988
    Assignee: Halliburton Company
    Inventor: Jon B. Christensen
  • Patent number: 4735264
    Abstract: The high pressure gauge carrier of the present invention uses an outer gauge carrier housing having disposed therein a pressure-tight inner housing carrying a temperature gauge in the interior thereof. The inner housing is substantially filled with a compressible liquid, and the pressure tight connections of the inner housing incorporated metal to metal seals in order to eliminate the failure of elastomeric seals at the elevated temperatures encountered by the gauge carrier.
    Type: Grant
    Filed: July 30, 1986
    Date of Patent: April 5, 1988
    Assignee: Halliburton Company
    Inventors: Wesley J. Burris, II, Vincent P. Zeller, Jon B. Christensen, William H. Shoffner
  • Patent number: 4711123
    Abstract: A bundle type gauge carrier including a support assembly which may be loaded with a plurality of downhole gauges, the support assembly being quickly insertable in a case assembly incorporated in the pipe string used for a formation test. The gauges are grouped in the support assembly about an unobstructed central flow path, whereby each gauge is exposed to the pressure and temperature of the flowing oil and gas during a drill stem test.
    Type: Grant
    Filed: November 25, 1985
    Date of Patent: December 8, 1987
    Assignee: Halliburton Company
    Inventor: Jon B. Christensen