Saudi Aramco gets patent for unique cement tester
Posted: 01 October 2007
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Saudi Aramco has received patent for a unique downhole technology, a statement from its website said last week.
The Cement Shrinkage and Expansion Tester was patented by the company after science specialist Scott S. Jennings of EXPEC Advanced Research Center designed the device to measure cement contraction.
Under US Patent 7,240,545 titled “Test Apparatus for Direct Measurement of Expansion and Shrinkage of Oil Well Cements,” Jennings created an instrument to approve or reject certain cements for use in oil and gas wells.
The new device enables engineers to evaluate shrinkage or expansion as materials are heated to temperatures simulating well conditions. A standard mix of Class G cement shrinks 2% after it sets. High pressure is a concern in wells, expansion additives are used to reduce shrinkage during setting.
Jennings ' Cement Shrinkage and Expansion Tester is designed to fit into existing ultrasonic cement analyzer cells. Cement slurry is poured into the cell and separated by a rubber diaphragm. Water serves as a cushion between a floating piston and the diaphragm. Piston movement indicates shrinkage or expansion.
The instrument allows the company to ensure that selected materials are up to the task, saving money on costly repairs or shutdowns and promoting safer operations. |
