| 摘要 |
<p>Safety equipment for land or marine well completions is disclosed. In one embodiment of the invention a gate valve is provided in which the gate has a removable insert so that in one position of the valve, the insert can be removed (or inserted) via an upper vertical passage of the valve to provide full-bore access via an attached blowout preventer stack to the well head below. In another embodiment of the invention a gate valve is provided having at least two vertical passages through the gate. The first is large enough to provide full-bore access via an upper passage in the housing of the valve. The second is of a smaller diameter to provide vertical communication with tubing disposed in a lower vertical passage and in an upper vertical passage. Either of the above embodiments may be used in a lateral production tree where the gate is provided with an "L" or "T" shaped passage in another lateral portion of the gate and lateral outlets are provided in the valve housing. This abstract of the disclosure is neither intended to define the scope of the invention, which is measured by the claims, nor is it intended to limit the invention in any way.</p> |
