The loss of hydraulic pressure has been a problem in the primary cementing process for many years. The hydraulic pressure of the cement columns starts to decline after the pump stopped. Gas leakage and fluid migration will occur if hydraulic pressure is underbalanced. Among those hydraulic pressure improvement solutions, my research is based on mechanical solutions, casing vibration and top cement pulsation. Break the gel strength by keeping the cement slurry in motion. Those two solutions can prevent poor fluidity and maintain hydrostatic pressure. But disadvantages of those two methods are obvious. First, sufficient energy cannot be generated due to low frequency. Second, it is hard to manipulate casing vibration in ultra-deep wells.
In my design, several agitators will be mounted outside the casing at a different depth and agitate the cement slurry directly. The final result shows this new technique do benefit on maintaining hydraulic pressure effectively. And this hypothesis is proved practical by conducting experiments. Mix cement slurry and pour part of them in to a plastic mode and agitate the rest. Testing the cementing quality by using the compression tester. And the compressive strength works as the cementing quality indicator. The final result indicated that agitation benefits the compressive strength significantly.
|Commitee:||Boukadi, Fathi, Feng, Yin|
|School:||University of Louisiana at Lafayette|
|School Location:||United States -- Louisiana|
|Source:||MAI 56/01M(E), Masters Abstracts International|
|Keywords:||Agitation, Compressive strength, Oil well cement|
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