| 摘要 |
<p>An oil field system for Through Tubing Rotary Drilling comprising:
a main body having a bore therethrough, the main body (20) having a connection at one end of the bore for, in use, connecting the main body to an existing wellhead, tree or other oil field equipment;
a transverse cavity (23) through the bore, the cavity having at least one opening to the outside of the main body;
a plurality of flow control devices for insertion, at different times, into the cavity in order to selectively control fluid flow through the bore;
wherein the plurality of flow control devices includes a gate valve (17) and drilling BOP rams (29).</p> |
