針對深海高溫高壓環境的水下井口系統

Dril-Quip’s BigBore IIe? Subsea Wellhead System meets the demands of HPHT well environments. The BigBore IIe? is fully verified and validation tested for structural capacity and high fatigue resistance.

The 18 ?” nominal bore high-pressure wellhead housing is available with a 15,000 psi and a 20,000 psi working pressure (WP) rating. It is available with a 27″ nominal O.D. and a 30″ nominal O.D. mandrel. The wellhead is sized for mating to surface casing and accommodates 16″ and 18″ supplemental casing hanger systems.

The BigBore IIe Subsea Wellhead System is highly flexible to accommodate a complex casing program that satisfies deep HPHT well objectives.

Features / beneFits unique to the bigbore iie?
?Eliminates the need for extra drilling and production lockdown devices
?Seal Assembly provides 2 million lbs. hanger lockdown capacity to resist thermal and pressure loads
?Significant cost savings by reducing the number of trips
?High load capacity meets requirements of next generation 20 ksi drilling rigs and HPHT well designs
?DXe? locking profile offers industry best structural capacity and fatigue resistance
?Tested and qualified to normal, extreme and survival loads per API 16A 4th Edition and API 17TR7
?Full scale fatigue tested
?Qualified to 20,000 psi WP and 35° to 350° F per API 6A Appendix F PR2 Group 4, with additional dynamic seal endurance testing

The BigBore IIe Subsea Wellhead System is the next- generation wellhead system designed for HPHT service in deepwater / deep well applications.
?Designed for 15,000 psi (27″) and 20,000 psi (30″) rated working pressure and H2S service between 35° to 350° F with all metal-to-metal sealing
?Supports 8.8 million lbs of end-load (combination of casing weight and test pressure) at the bottom internal landing / load shoulder profile
?Highest available combination of bending, tension and load capacities using the Dril-Quip DXe? profile
?Utilizes adapters positioned in 22″/23″ surface casing joints for landing 18″ and 16″ supplemental casing hanger systems
?18″ and 16″ casing, casing hangers and testable / retrievable
/ replaceable seal assemblies can pass through 21″ OD drilling riser, 18-3/4″ BOP Stack and BigBore IIe wellhead housing
?All casing hangers and seal assemblies are run, set and
tested on drill pipe running string in a single trip
?
High pressure wellhead actively locked into low pressure wellhead with 2.0 millions lbs of preload to unitize both conductor and surface strings for superior bending load reaction and fatigue resistance
?Utilizes field proven BigBore II-H HPHT metal-to-metal sealing technology
?Incorporates ROV-assisted annulus shutoff monitoring systems for all casing strings cemented back to surface
?Large cement return flow-by areas on all casing hanger systems
?Bit-runnable wear sleeves and wear busings available
?Available with hydrate diversion plate option
?Alternate casing programs accommodated
?All component designs are based on existing BigBore II-H technology and long successful BigBore-II field history

The BigBore IIe Casing Hanger Seal Assembly provides high lockdown capacity and bi-directional high pressure metal- to-metal sealing, suitable for liquid or gas HPHT service.
?Seals in a recessed groove in the wellhead bore, which protects against scoring in the seal bore
?Locks to the wellhead using the outer lock ring to hold down the seal and prevent excessive movement of casing hanger and seal when casing strings are exposed to thermal growth loading
?Locks to casing hanger using the inner lock ring to resist seal movement when seal is exposed to pressure from below
?Seal Assembly outer lock ring as 2,000,000 lbs lockdown capacity
?Successfully tested in gas medium per API 6A PR2 requirements with zero leakage and Group 4 Dynamic seal endurance testing with no elastomers
?Metal-to-Metal sealing element is weight set and pressure energized
?Lower portion of seal has pressure assisted puller element that acts as piston to pull seal into position using test pressure
?Same seal assembly is used on first and second position casing hangers; seal locks to both casing hanger and wellhead
?Can be retrieved with straight vertical pull – no rotation required
?Can be run separately with Seal Assembly Running Tool

Dril-Quip subsea WeLLheaD anD coMPonents are quaLiFieD to the Latest inDustry stanDarDs
?Designs are evaluated with the latest 3-D analytical software tools by experienced Dril-Quip stress engineers.
?The latest API standards are used for both design verification and validation testing.
?Wellhead components have been tested and qualified to API 17D 2nd Edition and 6A PR2 20th Edition requirements.
?High pressure/high temperature wellhead system components have been tested and qualified to API 6A Appendix F Group 4 in addition to dynamic seal testing over and above industry requirements.
?Complete system integrated verification and vali- dation testing helps assure individual component capacities match or exceed the system capacity requirements.