DOWNHOLE VIBRATION MONITORING & CONTROL SYSTEM

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Description

Testing of the prototype valve began during this quarter. The objective of the first preliminary tests was to determine the pressure drop that can be created across the valve under different conditions of flow and pressure. As described in Quarterly Report 3, the system uses pneumatic pressure to activate a cylinder which in turn loads two hydraulic cylinders containing the MR fluid. Testing was preformed with no sensors or gauges other than the air pressure supply gauge. The valve was powered at 36 volts and drew about 3.5 amps. The valve held back the MR fluid at 30 psi. (This ... continued below

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6 pages

Creation Information

Cobern, Martin E. October 30, 2003.

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Description

Testing of the prototype valve began during this quarter. The objective of the first preliminary tests was to determine the pressure drop that can be created across the valve under different conditions of flow and pressure. As described in Quarterly Report 3, the system uses pneumatic pressure to activate a cylinder which in turn loads two hydraulic cylinders containing the MR fluid. Testing was preformed with no sensors or gauges other than the air pressure supply gauge. The valve was powered at 36 volts and drew about 3.5 amps. The valve held back the MR fluid at 30 psi. (This is the air pressure required to get the cylinders to move without any flow obstruction.) The air pressure was then increased gradually until the valve could no longer hold back the MR pressure and the cylinders moved slowly. The maximum air pressure that could be held without movement of the cylinders was 85 psi; however. as much as 30 psi of this pressure may be required to overcome stiction. Thus, the maximum pressure we were able to stop was somewhere between 55 and 85 psi of air. This translates into 1500 to 2330 psi MR fluid pressure. Based on the ratio of the piston area to that of the MR damper valve, this in turn translates to a force of 9,700 to 15,000 pounds. A force of this magnitude is what is required for operation of the damper under typical downhole conditions. Initial testing indicates that a valve capable of producing the required damping under the anticipated downhole conditions is technically feasible. The project is progressing, but behind schedule, and a four-month extension of Phase I is being requested. This extension will not alter the budget for Phase I and is expected to have no significant effect upon the overall program schedule or budget.

Physical Description

6 pages

Notes

OSTI as DE00831129

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  • Other Information: PBD: 30 Oct 2003

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  • Report No.: NONE
  • Grant Number: FC26-02NT41664
  • DOI: 10.2172/831129 | External Link
  • Office of Scientific & Technical Information Report Number: 831129
  • Archival Resource Key: ark:/67531/metadc788170

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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Creation Date

  • October 30, 2003

Added to The UNT Digital Library

  • Dec. 3, 2015, 9:30 a.m.

Description Last Updated

  • Jan. 3, 2017, 12:20 p.m.

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Cobern, Martin E. DOWNHOLE VIBRATION MONITORING & CONTROL SYSTEM, report, October 30, 2003; United States. (digital.library.unt.edu/ark:/67531/metadc788170/: accessed January 17, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.