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I saw your advert in the paper <a href=" http://www.sharonlevy.com/artpages/help-me-write-my-research-paper.html ">website that pay professors do homework</a> Halliburton provided cementing services for BP at the ill-fated Macondo drilling operation. Those services included placing "centralizers," or huge plugs, at various points in piping as it was placed inside the drilled well. Centralizers help ensure cement properly seals a well.