| 摘要 |
<p>A tubing mounted completion assembly (100) includes at least one downhole valve assembly (10) and at least one contingency device (12, 14, 16, 18). The contingency device or devices (12, 14, 16, 18) is/are associated with and separate from the downhole valve assembly (10). The contingency device or devices (12, 14, 16, 18) is/are adapted to operate upon failure of operation of the downhole valve assembly (10).</p> |
