Dual bore riser

Details Dual bore riser Dual bore riser

1997-12-05

1999-10-05

Schoeppel, Roger

Wells

Submerged well

Connection or disconnection of submerged members remotely...

166350, 166367, 166380, 166 772, E21B 33038, E21B 1701

Patent

active

059608854

DESCRIPTION:

BRIEF SUMMARY
The present invention relates to a dual bore riser for use in sub-sea production or water or gas injection systems.
Most conventional sub-sea production systems require a dual bore riser to provide access to a larger production bore and an annulus bore which is smaller. A conventional dual bore riser system consists of a large number of parts which require to be assembled during run-in. At the present time the cost of a conventional dual bore riser costs approximately .English Pound.1,000 per foot and requires significant storage space which is normally limited on off-shore vessels. When such a conventional riser is run, it requires a considerable amount of specialised equipment for handling and make-up such as spiders etc. This has an impact in terms of both purchase cost and increased running times.
FIG. 1 shows an exploded view of the principal parts of a conventional dual parallel bore riser system. It will be seen that approximately ten parts shown, the surface tree, a riser handling spider, a surface tree adaptor joint, a riser tensioning joint, a standard riser joint and a riser handling test tool, a dual parallel bore riser joint adaptor which is approximately 40 ft. long, an orientation joint, it will be seen from this drawing that the entire structure is relatively complex and includes the assembly of a considerable number of prefabricated components which, as outlined above, require significant storage space which is normally limited on off-shore vessels.
An object of the present invention is to obviate or mitigate at least one of the aforementioned disadvantages.
A further object of the present invention is to provide an improved dual bore riser which is relatively less expensive to purchase and to run and which requires significantly less storage space than a conventional riser system.
A further object of the present invention is to obviate the requirement for specialised handling equipment and make-up of the dual bore riser.
This is achieved by providing a dual bore riser system which comprises a conventional monobore riser for production access and a independent coil tubing disposed in parallel with the monobore riser for providing access into the annular space between production coiling and production tubing. The monobore riser comprises discrete joints of tubing, casing or drill pipe and the coil tubing riser which may be any size of coiled tubing but normally between 23/8" and 27/8" outside diameter.
During deployment of the tubing hanger the standard monobore riser and coil tubing riser interface with the tubing hanger running tool via a landing spool or adaptor adaptor. The coiled tubing is deployed from a storage reel, via a roller sheave and straightening rollers into the well with the tubing riser. The coiled tubing is clamped to the tubing riser at intervals along its length corresponding to a joint every 30 ft.
The upper end of the landing spool or adaptor receives the tubing and also contains a termination for the coiled tubing which is typically a swage device. The dual parallel bore landing spool adaptor and landing spool has an outside diameter to fit into the 183/4" BOP stack and the landing spool has a smooth outside surface for co-operating with the interior of the annular BOP.
The monobore and coiled tubing risers may be coupled to one of; a conventional stress joint and riser disconnect package to a sub-sea Christmas tree, a dual bore proprietary tubing hanger or a dual bore test tree which fits beneath the blind/shear rams in the BOP stack in the same manner as disclosed in corresponding International Patent Application WO93/03255.
According to one aspect of the present invention, there is provided a method of running intervention equipment into a well during or after completion, said method comprising: sections of tubing riser to the well equipment, riser with the tubing riser to create a structure such that the tubing riser is adjacent and parallel to the coiled tubing, spaced locations along the length of the riser to create a dual bore riser, required for well operati

REFERENCES:
patent: 4059148 (1977-11-01), Blomsma
patent: 5161620 (1992-11-01), Ritter, Jr.

Affiliated with

Also associated with

Rating

Dual bore riser does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Dual bore riser, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Dual bore riser will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1160998