| 摘要 |
<p>A cementing head apparatus (10) comprises a swivel head body (12) with a manifold assembly (14) having remote control valves (292,296) and plug release means (234). The body (12) is connectable to a tool string, and the cementing manifold is connectable to a cement source. The manifold (14) is rotatably mounted on the body (12) to provide continuous fluid communication between the manifold and body even when the body is rotating with respect to the manifold. The rotatable mounting is provided by a swivel connection comprising a mandrel (40) extending from the body (12) and a sleeve (68) connected to the manifold. The swivel connection also provides continuous communication between a pressure line (288), extending from the sleeve (68) to a pressure supply, and another pressure line (156), extending from the mandrel (40) to a dart or ball releasing mechanism (234). This allows the releasing mechanism to be actuated even when the body is rotating with respect to the manifold and when the entire apparatus is being reciprocated. Another swivel connection (158,186) can be used which also provides continuous fluid communication between the manifold and body. <IMAGE> <IMAGE></p> |
