Setting a Global Standard. SDX BOP Stack Subsea Wellhead Connectors

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1 Setting a Global Standard SDX BOP Stack Subsea Wellhead Connectors

2 Features Dril-Quip s DX BOP Stack Subsea Connectors are an excellent choice to safely meet the everchanging requirements for subsea connectors. They are designed for deep water, high wellhead pressure, deep wells and long drilling times. DX Connectors are available in a variety of designs and configurations and can be modified to meet specific customer requirements. Basic DX models are identified as: DX-HAR Connector pressure rated to 10,000 psi, with advanced features for high angle release DX-15 Connector pressure rated to 15,000 psi DX-DW Connector pressure rated to 15,000 psi, with advanced features for deeper water SDX-DW Connector pressure rated to 15,000 psi, DX-DW Connector designed for the 30" mandrel subsea wellhead systems Features: High load capacity Available with flange or studded connection Tight load path through the upper body, latch segments and wellhead piston/cam ring design maximizes locking force within a smaller dimensional envelope Special seal design and stainless steel surfaces extend seal life Self-locking taper on latch segments offer greater locking reliability Quick unlatching time; meets all international regulatory requirements Primary unlocking force 25% greater than locking force Emergency secondary unlocking force 88% greater than primary locking force gasket profile includes primary metal-to-metal seal surface with secondary metal-to-metal surface for emergency use Seals on the independent secondary release piston are not used during normal connector operation Design is compatible with existing blowout preventor hydraulic control systems Design offers trouble-free, easy operation Field-proven performance This catalog focuses on DX Connectors for subsea BOP stack applications. Other uses for Dril-Quip DX and SDX Connectors are: Dry Tree Systems (Tie-Back to Floating Production Platform) Subsea Completion Trees Export Riser Connector Surface BOP Stack Connector Flowline Connector 2

3 Connector Components Upper Body Gasket Retainer/ Release Lever Indicator Rod Gasket Retaining Mechanism Primary Lock Port Upper Split Retractor Unlock Port Latch Segment Spreader Lower Split Retractor Primary Unlock Port Hydrate Diversion Seal Conversion KIT Gasket Latch Segment Unlatch Piston SDX BOP Stack Subsea Wellhead Connector 3

4 Design and Operations Design Features Assure Positive Disconnects DX Connectors incorporate three hydraulic circuits: Unlock Primary Lock The primary locking circuit is optimized to deliver maximum locking force to the annular piston/cam ring. Primary Unlock In emergency situations, the independent secondary unlock circuit functions a passive secondary annular piston. The secondary unlock piston unlocks the connector with 88% more force than the primary lock piston. The primary unlock circuit provides 25% more unlock ing force than locking force. Unlock Piston Unlock Piston Unlock Piston Unlock Piston DX Connector in Locked Position DX Connector in Unlocked Position DX Connector in Unlocked Position Using the Unlock System DXDW Connector Unlock Piston Latching are Automatically Retracted When the Connector is Unlocked DX Connectors incorporate a positive unlocking mechanism. This mechanism ensures that the latch segments are fully retracted from the wellhead when the connector is unlocked. A spreader, attached to the annular piston/cam ring, spreads the latching segments apart when unlock pressure is applied and the cam ring moves up. Then the split ring retractors pull the latch segments away from the wellhead. 4 Latch Segment Locked Latch Segment Unlocked and Automatically Retracted

5 Testing and Technical Data The DX Connector Clamp Design Prevents Bolt Failure BOLTS NOT IN LOAD PATH The DX Connector is a clamp segment type that behaves as a simple hub and clamp arrangement. As the segment latches to the wellhead, it clamps to the DX Connector upper body simultaneously and creates a closed loop with a near straight load path. Any loads applied to the connector travel only through the segment that is made from highly ductile alloy steel. The Dril-Quip DX Connector has bolts connecting its outer body and cover plate; however, these bolts are not in the load path. These bolts are made from ductile API L7 alloy material, and are treated with baked on Teflon coating for corrosion protection. The bolts are not zinc electroplated This simple clamp design of the DX Connector removes the possibility of a bolt failure causing loss of connection. DRIL-QUIP DX CONNECTOR LOAD PATH Computer-Designed Using highly sophisticated design tools, a very extensive 3-dimensional advanced finite element analysis (FEA) was carried out over numerous design iterations to optimize every minute detail of the profile. The analysis simulates very closely the connector installation and service conditions and includes preloading and application of internal/external loads (pressure, bending, tension/compression, and load combinations) while observing the stress behavior throughout the connector components. Particular attention has been paid to achieve uniform load distribution and minimization of the peak surface stresses on the interface profiles of the latch segments, wellhead, and upper body which is directly related to the fatigue performance of the connector. This advanced technology has allowed the company to develop an optimized locking profile geometry. Analysis has also been conducted on the DX gasket to observe the behavior of contact loads and gasket s reaction to the internal pressure and external loads. These results have enabled the company to create wellhead connector design with high load capacity, all within the smallest possible dimensions envelope. 5

6 DX-DW Connector DX-DW Connector Dril-Quip s SDX-DW Subsea Connector, is pressure rated to 15,000 psi, and is a high-strength, field-proven BOP stack wellhead connector designed for deep water, deep wells and long drilling times. It is easily adaptable to any existing BOP stack with minimal modifications and is compatible with all BOP stack control systems. The SDX-DW Connector is designed to sit on a 30"subsea wellhead mandrel. Furthermore, the connector can accommodate the SDX H-4 locking profile. New High Fatigue SDX Profile Dril-Quip's SDX Connector and SDX locking profile is a proprietary design engineered specifically for high fatigue resistance and provides extended service life during drilling and production operations. By modifying tooth profile curvature, the connector was designed to provide maximum fatigue performance. The high fatigue resistance is directly attributed to a very significant reduction of stress amplification factors of all the critical fatigue locations of the connector and wellhead profile interface. DX-DW SDX Profile SDH-H4 Profile SDX Profile SDX-DW Connector 8 up 6 down DX-DW Specifications Part Number Rated Working Pressure Swallow Added Stack Height Outside Diameter Weight *Maximum Operating Pressure Vol. to Latch Vol. to Unlatch Vol. for Unlatch * Unlatch Only SDX 30" Mandrel ,000 psi 27.49" 34.65" 64.53" 39,000 lbs 4,500 psi gal gal gal SDH H-4 30" Mandrel ,000 psi " 34.33" 64.53" 39,000 lbs 4,500 psi gal gal gal 6

7 SDX Profile/30" Mandrel 15 Internal Pressure (ksi) 10 5 Pressure End-Load (kips) Bending Moment (MM ft-lbf) Rated Capacity (67% Yield) Extreme (80% Yield) Survival (100% Yield) Capacities based on 3-D FEA with the following assumptions: 1. Internal pressure acting on 18-3/4" nominal bore with PEL included 2. Preload at 1,500 psi locking pressure = 4.08 million lbf Contact DQ Engineering for capacities with various levels of tension/compression Extreme and Survival envelopes are presented for information purposes SDH-H4 Profile/30" Mandrel 15 Internal Pressure (ksi) 10 5 Pressure End-Load (kips) DX-DW SDX Profile SDX-DW Conn Bending Moment (MM ft-lbf) Rated Capacity (67% Yield) Extreme (80% Yield) Survival (100% Yield) Capacities based on 3-D FEA with the following assumptions: 1. Internal pressure acting on 18-3/4" nominal bore with PEL included 2. Preload at 3,000 psi locking pressure = 5.85 million lbf Contact DQ Engineering for capacities with various levels of tension/compression Extreme and Survival envelopes are presented for information purposes 7

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