ROTATING AND RECIPROCATING SWIVEL APPARATUS AND METHOD

摘要

What is provided is a method and apparatus wherein a rotating and reciprocating swivel can be detachably connected to an annular blowout preventer thereby separating the drilling fluid or mud into upper and lower sections with the mandrel of the swivel being comprised of double box end joints and using double pin end subs to connect a plurality of such mandrel joints together.

主权项

1. A method of using a reciprocating swivel in a drill or work string, the method comprising the following steps:
(a) positioning a rotating and reciprocating tool to an annular blow out preventer, the tool comprising a mandrel and a sleeve, the sleeve being reciprocable relative to the mandrel and the mandrel including at least one joint having double box ends with the joint being severable by a ram blow out preventer, the sleeve having two spaced apart sealing units, the swivel including an interstitial space between the sleeve and the mandrel with first and second spaced apart sealing units each sealing the interstitial space; (b) after step “a”, having the annular blow out preventer close on the sleeve; and (c) after step “b”, causing relative longitudinal movement between the sleeve and the mandrel, wherein in step “a” the mandrel includes two double box end joints which are connected by a double pin end sub, and in step “c” when the double pin end sub is at the same longitudinal position as the first sealing unit, the first sealing unit loses its seal of the interstitial space, but the second sealing keeps its seal of the interstitial space.