| 摘要 |
<p>A sequential hydraulic well control system provides actuator selection and operation utlizing pressure applied to hydraulic lines (A, B, C) in a sequence. In a disclosed embodiment, an actuation control device (348) of a well control system includes multiple pistons, at least one of which is included in a latch for selectively permitting and preventing displacement o f another of the pistons. When one of the pistons displaces in response to pressure applied sequentially to hydraulic inputs (A, B, C) of the control device, an associated actuator (370) is placed in fluid communication with t he inputs.</p> |
