Claims
- 1. A tubing handling system for underwater service comprising:
- tubing injector for moving tubing through a wellhead;
- a fluid confining enclosure for said injector;
- an upper stripper secured to the top of said enclosure;
- said stripper including:
- a housing,
- upper and lower confronting cup-shaped receptacles in said housing,
- resilient seals in each receptacle,
- a bore through each receptacle and seal for receiving a tubing,
- holding means between said resilient seals holding them in engagement with said receptacle and with a tubing to seal therewith, and
- fluid relief ports in said housing between said receptacles to exhaust fluid from said housing.
- 2. The tubing handling system of claim 1 wherein a lower stripper constructed as said upper stripper is secured to the bottom or said enclosure.
- 3. The tubing handling systems of claim 2 wherein at least said holding means is a spring.
- 4. The tubing handling system of claim 2 wherein at least one of said holding means is a rigid frame.
- 5. The tubing handling system of claim 1 wherein said cup-shaped receptacles have frustro-conical inner surfaces with their large diameters adjacent, and said resilient seals have outer frustro-conical surfaces conforming to said receptacles inner surfaces.
- 6. The tubing handling system of claim 5 wherein a lower stripper constructed as said upper stripper is secured to the bottom of said enclosure.
Parent Case Info
This is a division of our copending application Ser. No. 07/293,640, filed Jan. 5, 1989, now U.S. Pat. No. 4,923,005 issued May 8, 1990.
This invention relates to systems for handling reeled tubing or pipe and more particularly to a system for moving tubing through a wellhead and for emergency release of the tubing from the wellhead.
Reeled tubing or pipe has conventionally been moved through a wellhead by an injector in land operations but the prior art does not teach a practical system for injector controlled tubing in subsea operations.
Shears are known for cutting a pipe free from a well in an emergency, but the cut pipe is open and fluid in the pipe above and below the cut may escape from the pipe.
The prior art does not teach a subsea injector, the control of pressure in a subsea injector enclosure, or the feeding of tubing and control of leakage of fluid which may occur about the tubing as it passes through the enclosure.
An object of this invention is to provide a system for handling reeled tubing which protects the tubing as it is fed into the system, permits shearing the tubing free from the wellhead while simultaneously crimping closed at least one cut end of the tubing and preferably both cut ends, controls the internal fluids in an injector enclosure, and prevents leakage of fluid pass the tubing to the exterior of the enclosure as the pipe is fed through the enclosure.
An object of this invention is to provide a guide for reeled tubing passing through a system for handling reeled tubing which prevents sharp bends of the tubing at the upper end of the system.
Another object is to provide a shear for reeled tubing which, as it shears, crimps at least one end of the cut tubing.
Another object is to provide a shear for reeled tubing which, as it shears, crimps both cut ends of the tubing.
Another object is to provide a shear for reeled tubing which as it shears forms the tubing into a shape which will receive the overshot of a fishing tool.
Another object is to provide a shear for reeled tubing which as it shears forms the tubing into a double C configuration which will accept the overshot of a fishing tool.
Another object is to provide a tubing injector with an enclosure and maintain the internal pressure slightly above the exterior pressure to prevent entry of sea water.
Another object is to provide a tubing injector with an open bottom enclosure and control the level of sea water in the enclosure with a float controlled source of gas under pressure.
Another object is to provide a tubing injector and enclosure therefor with one or more strippers for containing fluid against excess leakage about a tubing passing through the injector enclosure and recovering any fluid leaking pass the stripper.
Another object is to provide a reeled tubing system in which a shear is combined with an upper tubing guide and protector and an injector within an enclosure together with a tubing stripper is positioned below the shear in which a tubing is assisted in being centered in the shear by the guide, stripper and injector.
Another object is to provide a tubing stripper for an injector enclosure which collects and disposes of any fluid stripped from a tubing moving through the enclosure.
Other objects, features, and advantages of this invention will be apparent from the specification, drawings, and claims.
US Referenced Citations (12)
Foreign Referenced Citations (2)
| Number |
Date |
Country |
| 49536 |
May 1939 |
FRX |
| 1092 |
Dec 1898 |
GBX |
Divisions (1)
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Number |
Date |
Country |
| Parent |
293640 |
Jan 1989 |
|
Patent Grant
4986360
