Method and apparatus of hot tapping multiple coaxial or nested strings of underwater piping and/or tubing for overturned wells or platforms
View Patent ↗A method and apparatus for tapping into a pressurized multiple strings of coaxially situated tubulars for wells and/or platforms which have overturned wherein the tapping occurs underwater via a diver or remotely operated vehicle. The assembly includes a tapping tool connectable to the tubular via a saddle connection and an adjustable tapping clamp with adjustable support/locking feet, compression plate with view ports, and angularly adjustable hot tapping system, along with a drill/saw system.
1. A system for hot tapping a plurality of nested pipes including an exterior pipe having a bore and at least one interior pipe contained within the bore comprising:
(a) a hot tap tool guide assembly detachably connected to the exterior pipe, the assembly including at least one plate having a plate opening:
(b) a hot tapping tool capable of penetrating a selected one or more of the pipes, the tool including a hot tapping tip;
(c) a seal member on the hot tapping tool that enables a seal to be perfected between the hot tapping tool and a selected one of the pipes; and
(d) the hot tap tool guide assembly including a swiveling connection opening for supporting the hot tapping tip wherein the tip can be articulated angularly relative to the plate from a line that is generally perpendicular to the plate and wherein the tip is longitudinally extendable through the plate opening.
2. The system of claim 1 , wherein the tip is articulable in three hundred and sixty degrees about a generally circular path.
3. The system of claim 1 , wherein the tip is connected to the assembly through the swiveling connection and the swiveling connection includes a ball and socket joint.
4. The system of claim 1 , wherein the swiveling connection includes a swivel nut mounted on the plate which operatively connects the tip to the assembly and allows the angular articulation of the tip relative to the plate.
5. The system of claim 1 , wherein the hot tap tool guide assembly includes a compression plate and swivel nut, the swivel nut being connected through a ball and socket joint to the compression plate, the swivel nut being threadably connected to a mandrel, and the tip being connected to the mandrel, so that rotation of the mandrel relative to the swivel nut in a first direction causes movement of the mandrel towards the interior of the hot tap tool guide assembly, and relative rotation of the mandrel relative to the swivel nut in a second direction causes movement of the mandrel away from the plate.
6. The system of claim 5 , wherein the plate includes at least one viewing window.
7. The system of claim 5 , wherein the swivel nut is eccentrically mounted on the plate so that rotation of the plate causes linear movement of the swivel nut relative to the hot tap tool guide assembly.
8. The system of claim 5 , wherein the swivel nut is eccentrically mounted on the plate so that rotation of the plate causes a relative change in position of the swivel nut relative to the hot tap tool guide assembly.
9. The system of claim 1 , wherein the hot tap tool guide assembly includes a clamp which detachably connects the hot tap tool guide assembly to the exterior of the pipe.
10. The system of claim 1 , wherein there are straps attached to the plate that enable the plate to be secured to the pipe, wherein the straps hold the plate to the pipe.
11. A method of tapping hot tapping a plurality of nested pipes having an exterior pipe and at least one interior pipe comprising the steps of:
(a) connecting a hot tapping tool to the exterior pipe;
(b) angularly adjusting the hot tapping tool in relation to at least one of the plurality of nested pipes;
(c) providing a seal member on the hot tapping tool that creates a sealing connection with an exterior surface of a selected one of the plurality of nested pipes; and
(d) hot tapping to the selected one of the plurality of the nested pipes.
12. The method of claim 11 , wherein in step “a”, the hot tapping tool includes a swiveling connection for a hot tapping tip wherein the hot tapping tip can be articulated angularly from a line that is generally perpendicular to an exterior surface of the exterior pipe.
13. The method of claim 11 , wherein the tip is connected to hot tapping tool through a ball and socket joint.
14. The method of claim 11 , wherein the tip includes a swivel nut which operatively connects the tip to the hot tapping tool and allows the angular articulation of the tip.
15. The method of claim 11 , wherein the hot tapping tool includes a compression plate which provides a longitudinal force on the tip to compress the tip, and swivel nut, the swivel nut being connected through a ball and socket joint to the hot tapping tool, the swivel nut being threadably connected to a mandrel, and the tip being connected to the mandrel, such that rotation of the mandrel relative to the swivel nut in a first direction causes movement of the mandrel towards an interior of the hot tapping tool, and relative rotation of the mandrel relative to the swivel nut in a second direction causes movement of the mandrel away from the interior of the hot tapping tool.
16. The method of claim 15 , wherein during step “d”, the hot tapping tool includes at least one viewing window which allows for viewing of the tip.
17. The method of claim 15 , wherein during step “d” the hot tapping tool includes a plurality of viewing windows, each of which allows for viewing of the tip.
18. The method of claim 11 , wherein multiple coaxial strings of underwater piping and/or tubing for overturned rigs or platforms are simultaneously hot tapped.
19. The method of claim 11 , wherein during step “b” angular adjustment of the tip relative to the exterior piper includes adjustment both up and down and side to side, and in a spherical manner.
20. The method of claim 11 , wherein during step “d” one or more openings provide visual access to pipes and the area of hot tapping seal even while hot tapping tool is mounted on the clamp.