Patent ID: 7325610
Filing Date: 2008-02-05
Classification: E21B,Y10T

Abstract:
1. A method of forming a wellbore comprising: operatively connecting a circulating head cementing tool to a gripping mechanism member and a top drive, the gripping mechanism member having a radially movable gripping element; gripping a first casing with the gripping mechanism member; sealingly engaging the first casing with a circulating seal member; rotating the circulating head cementing tool, the gripping mechanism member, and the first casing; and lowering the first casing into the wellbore, wherein lowering the first casing into the formation comprises rotating an earth removal member operatively connected to a lower end of the first casing while introducing fluid through the first casing; operatively connecting a cementing plug to the circulating head cementing tool; gripping a second casing with the gripping mechanism member; and lowering the second casing into the wellbore.