| 摘要 |
A pushdown and rotating tool for holding, pushing, and rotating a floated casing string into a wellbore is provided. The tool includes a mandrel, a housing attached about the external diameter of the mandrel and shaped to receive a collared casing, a jaws assembly within the housing, and an automatic hydraulics system for actuating the jaws. The mandrel and housing are connected such that they can move telescopically relative to one another, and such motion actuates the jaws. The tool has a threaded coupling for a top drive connection, the top drive providing the pushdown and rotational forces which are transmitted to the casing by way of the tool. The mandrel also has an internal passage-way through its length and a male connection at the bottom. The tool facilitates floating a casing into a substantially horizontal wellbore when the casing becomes buoyant and tries to "kick back" out of the well, or when the floated casing becomes stuck and requires rotation to extend beyond the obstacle.
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