Riser Couplings Coupling selection should

Load rating of support ring Stress amplification factor (fatigue resistance) Reliability Speed of make-up Preload for make-up Maintenance requirements Main tube dimensions Strength to weight ratio 2.8 LOWER MARINE RISER PACKAGE (LMRP). 2.8.1 Function. The Lower Marine Riser Package typically includes an assemblage of a riser adapter, flex ball joint, one, two, or no annular BOPs, subsea control pods, and a hydraulic connector mating the riser system to the BOP stack. The LMRP provides a...

Specialty Equipment

2.14.1 Thirty-Inch Latch (Pin Connector). Under some conditions, it is advantageous to have the riser deployed while drilling the 26 hole. In that event, a 30 latch is used to connect the marine riser to the 30 wellhead housing. A ring joint pressure seal is effected between the latch assembly and the wellhead housing. Hydraulically operated multiple segments are used to form the mechanical latch engagement the segments extend radially inward to engage a support shoulder on the wellhead housing...

Typical Designs

Riser main tube and the associated couplings are generally sized to be compatible with a specific BOP stack size. Compatible BOP bore and riser outer diameter combinations are 13 5 8 (346.1 mm) BOP, 16 (406.4 mm) Riser 16 3 4 (425.5 mm) BOP, 18 5 8 (473.1 mm) Riser 18 3 4 (476.3 mm) BOP, 20 (508 mm) or 21 (533.4 20 3 4 (527.1 mm) BOP, 22 (558.8 mm) or 24 (609.6 21 1 4 (539.8 mm) BOP, 24 (609.6 mm) Riser The main tube is specified by its outside diameter, wall thickness, and...

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Posite material of hollow spherical fillers in a matrix or binder. The most common forms of syntactic foam consist of tiny glass microspheres in a matrix of thermosetting plastic resin, often with larger micospheres of glass fiber reinforced plastic. The diameter of syntactic foam modules depends primarily on the buoyancy requirements and the foam density. The foam density depends on the design water depth. Denser material is normally used for deeper water to withstand higher collapse...

Riser Induced Load Considerations

Riser introduces shear, bending, and tension loads into the LMRP, the BOP stack, the hydraulic connectors, the wellhead, and the casing. These loads and moments should be evaluated to ensure maximum stresses are within design allowables and the fatigue life is acceptable. The riser also induces loads on the drilling vessel that may need to be considered in the station keeping analysis. 3.2.3 Currents. For currents exceeding two knots, see section 5.3. 3.2.4 Drilling Fluid Density. Top tension...

API RPlb

RP 16Q Design., Selection, Operation, and Maintenance of Marine Drilling Riser Systems between successive layers. The first tier of joints should be off the ground to keep moisture and dirt away from the joints. The support shims should be spaced to prevent bending of the pipe and damage to the coupling. Joints should be stacked at a safe and accessible height, slightly inclined to assure proper drainage of water. Joints should be cleaned internally and externally, and protective coatings...

Pipe Wall and Buoyancy Tolerances

Large wall thickness tolerances permitted by API Spec. 5L are inappropriate for deep water riser main tube applications because significant weight and buoyancy penalties may be incurred. Consideration should be given to rolled and welded pipe with tighter thickness tolerances. Riser pipe and coupling dimensions should be engineered and selected to meet practical requirements. Material tolerances should be specified and negotiated with the steel mills. Likewise, tolerances for attached buoyancy...

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Drilling Riser

SAMPLE CALCULATION D.2 RISER DIAGRAM 14.4' ROTARY. DIVERTER amp UFJ TOP PART UPPER FLEX BALL JT. ,ncn. n JOINTS RISER w BUOYANCY 5 8x50 10 JOINTS RISER w o BUOYANCY 1 2x50' 800' J6 JOINTS RISER w o BUOYANCY 1 2x50' RISER JOINT w o BUOYANCY 5 8 x 50' q LOWER FLEX BALL JOINT 800' J6 JOINTS RISER w o BUOYANCY 1 2x50' RISER JOINT w o BUOYANCY 5 8 x 50' q LOWER FLEX BALL JOINT SEM SUBMERS BLE SPICED JAR EXAMPLE RISER CONFIGURATION 2000' W.D MLW

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Also excluded from the hydrodynamic calculation is the relative velocity of the riser passing through the water. The wave and vessel motion are stepped past the riser, the static solution is calculated for each step, and the maximum values of the critical parameters are observed over one wave period. There are two different approaches for solving the equations while including dynamics and relative velocities. A time domain solution is the more direct and...

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The tensioner system should be designed to permit one unit to be out of service for maintenance or repair without jeopardizing the ability of the remaining tensioner units to provide the required tension to the marine drilling riser. A unit may be either a single tensioner or a pair of tensioners, depending on specific design. g. Maximum Tension Setting. The maximum tension setting should not exceed 90 of DTL so that the maximum tension, including dynamic variations, will be less than the DTL....

Riser Main Tube

The riser main tube should have adequate strength to withstand combined loads from waves, current, applied tension, motion of the rig, and drilling fluid weight in accordance with Table. 3.1. Collapse pressure and handling loads should also be considered. The strength characteristics of the main tube are dictated by its diameter, wall thickness, and grade of steel. Steel grades commonly used in risers are X-52, X-65, and X-80, where the numbers refer to the minimum yield strength ksi of each...

Feeds.feedburner.com

RP 16Q Design, Selection, Operation, and Maintenance of Marine Drilling Riser Systems acceleration of the surrounding fluid. The force is parallel to the flow. In addition, under certain circumstances, there may be a relatively high frequency oscillating force, predominantly transverse to the flow, caused by the shedding of vortices. When the riser or an integral line has natural frequencies of vibration near the shedding frequency, vibrations of substantial amplitude may occur. Although this...

DInternal Diameter of the Line The ID of the

Choke kill lines should be selected to suit well control operations. The ID of the mud boost line should be selected to suit drilling fluid requirements. The ID of the hydraulic supply line should be selected to suit control system requirements. e. Failsafe design and orientation of choke kill and auxiliary lines. To prevent accidental mismatching of the choke kill and auxiliary lines when the riser is deployed, the couplings should be oriented asymmetrically around the riser support ring. To...

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At the riser connector, allowing the riser tensioners to lift the riser clear of the stack. After disconnect, the vessel should be moved off the well location and guidelines slackened to prevent the heaving riser and LMRP from striking the BOP. If conditions permit, the riser and LMRP can be retrieved and stored on the vessel. Otherwise the riser should be raised as high as possible and hung off. 4.4.4.2 Emergency. Each rig should be equipped with written emergency disconnect procedures which...

Tensioner System

Tensioner units are used to apply vertical force to the top of the marine drilling riser to control its stresses and displacements. The units are normally located on the drilling vessel near the periphery of the drillfloor. They provide nearly constant axial tension to the riser while the floating drilling vessel moves vertically and laterally in response to the wind, waves and current. 2.4.2 Typical Design. Tensioner units use a hydraulic ram with a large volume, air-filled...

Marine Drilling Riser System

Marine riser system forms an extension of the well bore from the Blowout Preventer BOP stack to the drilling vessel Figure 1.1 . The primacy functions of the marine riser system are to a. Provide for fluid communication between the well and the drilling vessel 1. In the riser annulus under normal drilling conditions. 2. Through the choke and kill lines when the BOP stack is being used to control the well, b. Support the choke, kill, and auxiliary lines, d. Serve as a running and retrieving...

Appendix B Riser Analysis Data Worksheet

Vessel Name Vessel Type Vessel Draft Drill Floor to WL Moonpool Dimensions No. Tensioners No. Tens. Accumul. Tens. Line Fleet Ang. Tens. Line B.S. kip Wire Wt. Tens, kip Collapsed Length ft Space-out to UFJ ft Outer BBL dia in O.B. Air Weight lbs Load Rating kip Drag Diameter in Mass Diameter in Fully Ext. Lngth ft Mud Ret. bel. DF ft O.B. Wall Thickn. in O.B. Subm. Wt. lbs O.B. Yield Point ksi CD1 CD2 lo hi Re Mass Coefficient, CM M.U. Length of Jt. ft Coupling Type Cplg. Load Rtg. kip Cplg....

Optional Features of the Tensioner Ring

For turret moored and dynamically positioned vessels, a low friction bearing on the tensioner ring allows the vessel to rotate. Resulting torsional loads on the riser and wellhead should be considered. b. For guidelineless reentry, hydraulic motor drive may be provided on the tensioner ring to orient the LMRP with the BOP stack. c. For operational convenience, the riser tensioner ring may be detached from the outer barrel and fitted for latching to the bottom of the diverter housing for...

Diverter System Surface

When drilling top hole through the 30-inch casing, the riser may be employed enabling the use of weighted mud to provide overbalance if needed. Blowout preventers BOPs are not in place at this stage see Section 2.14.1 because the 30-inch casing normally lacks sufficient pressure integrity to allow shut in. Therefore, if the well flows, the riser will direct that flow to the diverter system aboard the rig. Typically the diverter system includes an annular sealing device, means to...

Flexible Choke And Kill Lines

Flexible choke and kill lines allow relative movement at the telescopic joint drape hose and at flex ball joints jumper hose in the riser system. 2.10.2 Typical Design. Three basic designs are commonly used flexible pipe, steel reinforced hoses, or flow loops with threaded, clamped, or flanged end fittings. If threaded end fittings are used, they must contain a sealing means other than the threads. 2.10.3 Selection Criteria. Flexible lines should be compatible with the rest of...

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38 _American Petroleum Institute D.l.l Problem. A semisubmersible is drilling a well at a 2000 foot MLW water depth location. The wellhead has been cemented in place and its elevation above the mudline measured. Equipment, environmental, and operational data have been input into the accompanying Riser Analysis Data Worksheet. Determine the riser length using appropriate pup joints. D.1.2 Solution. Refer to Section 4.3.1 and Figure 4.1. Riser Length C F - A B D E F MLW mean tidal change distance...

Risermounted Chokekill And Auxiliary Lines

These lines carry fluids along the length of the riser. On most risers, they are an integral part of each riser joint and are attached on the outside of the riser main tube by support brackets. Generally, these lines are used for the following a. Choke Kill lines are used to provide a controlled flow of oil, gas or drilling fluid from the wellbore to the surface when the blowout preventer stack is closed. b. Mud Boost lines are used as conduits for drilling fluid which is...

Maximum Flex Or Ball Joint Angle Drilling Riser

RP 16Q Design, Selection, Operation, and Maintenance of Marine Drilling Riser Systems ing. In cases of extended drilling on a harsh environment location, such as on a North Sea template, a fatigue analysis of the riser may be advisable. The mean and maximum flex ball joint angle limits given for the normal drilling mode are intended to prevent wear and keyseating damage to the riser and flex ball joint. Prudent operational procedure should strive to maintain these angles as small as possible,...

API RPlb T T

RP 16Q Design, Selection, Operation, and Maintenance of Marine Drilling Riser Systems qualification may require material testing at low temperatures. Testing should be performed in accordance with ASTM A 370, E 23. The operating range of elasto-meric materials should also be consistent with cold weather operations. 5.4.1 Ice Formation. Operation of a marine riser in sub-freezing temperatures can lead to problems including Ice formation inside the exposed choke and kill lines, terminal fittings,...

Telescopic Joint Slip Joint

The basic function of the telescopic joint is to compensate for the relative translational movement between the vessel and the riser. The outer barrel provides structural support for riser tensioner loads. 2.6.2 Typical Design. A telescopic joint has an outer barrel which is connected to the drilling riser, an inner barrel which is connected to the drilling vessel, and a tensioner ring which transmits loads from the tensioner system to the outer barrel of the riser. 2.6.2.1...

Typical Design

Riser handling tools make up to the top of the riser during deployment and retrieval. The top connection is a short length of pipe which is supported by the hoisting equipment. Another tool of importance is the diverter handling tool which may be used to carry the entire riser system load prior to landing the stack on the wellhead. If the diverter handling tool is used to support the entire riser and BOP stack, it should meet the same standards as the riser handling...

Flex And Ball Joints

Flex and ball joints are used to allow angular misalignment between the riser and the BOP stack, thereby reducing the bending moment on the riser. They Eire also used at the top of the riser to allow for the motion of the rig. In some instances they may also be installed at some intermediate level in the riser string below the telescopic joint to reduce stresses in the riser. The rotational stiffness of flex joints makes them more effective than ball joints in controlling riser...

API RPlk

RP 16Q Design, Selection, Operation, and Maintenance of Marine Drilling Riser Systems_43 RP 16Q Design, Selection, Operation, and Maintenance of Marine Drilling Riser Systems_43 D.2.2.1 Riser Submerged Weight times Tolerance Factor W D.2.2.2 Riser Net Buoyancy times Tolerance Factor Bnfbt Riser Joints B Jt. B f B f D.2.2.2 Riser Net Buoyancy times Tolerance Factor Bnfbt Riser Joints B Jt. B f B f 11 type 3 9,240 101,640 0.96 97,574 D.2.2.3 Internal Drilling Fluid Cross Section of Riser,...

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A proposed method of controlling this flow incorporates an annulus closing device such as an annular BOP positioned in the riser string just below the telescopic joint. Beneath this device is a side outlet with a valve connected by means of a drape hose to a choke. With this arrangement, the riser could be shut in when gas is detected at the bottom of the riser. Thereby, the gas could be circulated out by pumping down the mud boost line and up the riser annulus to the choke. See Hall, Roche,...

Response Amplitude Operator For Riser Pipes

RP 16Q Design, Selection, Operation, and Maintenance of Marine Drilling Riser Systems Fail Safe. Term applied to equipment or a system so designed that, in the event of failure or malfunction of any part of the system, devices are automatically activated to stabilize or secure the safety of the operation. Fillup Line. The line through which fluid is added to the riser annulus. Flange-Type Coupling. A coupling having two flanges joined by bolts. Fleet Angle. In marine riser nomenclature, the...

Section Operating Procedures

Efficient deployment and subsequent retrieval of the riser and BOP stack are integral parts of the marine riser design. The designer should consider not only normal procedures, but also emergency disconnect and hang-off procedures as employed during a storm. These conditions may dominate the design criteria. This section presents examples of riser procedures. Operating personnel on each floating drilling vessel should be equipped with a written procedure for use of the marine...

Appendix F References And Bibliography

ANSI B 31.3, Chemical Plant and Petroleum Piping Code for Pressure Vessels. API Bulletin 5C3, Formulas and Calculations for Casing, Tubing, Drill Pipe and Line Pipe Properties. API Bulletin 16J, Comparison of Marine Drilling Riser Analyses. API RP 2A, Planning, Designing, and Constructing Fixed Offshore Platforms. API RP 2P, Analysis of Spread Mooring Systems for Floating Drilling Units. API RP 2R, Design, Rating, and Testing of Marine Drilling Riser Couplings. API RP 9B, Application, Care, and...

Storage and Handling Considerations

Deployment or retrieval of a deep water riser can require days. The drilling vessel should be equipped to remove the riser joints from the storage area and present them to the drill floor in a controlled and efficient manner. To deploy or retrieve a deep water riser in a minimum of time, modern deep water drilling vessels use longer joints up to 80 feet and utilize semi-automated handling systems. Because the time required to roundtrip a BOP for maintenance repair is an important economic...

Appendix C Associated Topics

C.l EMERGING TENSIONER SYSTEM DESIGNS. Seldom is a passive tensioner stroke of 50 ft required for a semisubmersible. Typically, actual heave motions of 15 to 20 ft might be anticipated for modern semisubmersibles, even in worst sea conditions. An active passive tensioner system has been designed that strives to reduce passive stroking to 25 ft, but permits active repositioning, under load, equivalent to a 50 ft stroke. This aim is achieved by decreasing high pressure air supply, and introducing...

Drilling Risers

Riser Buckling

TABLE 3 1 MARINE DRILLING RISERS MAX. OPERATING AND DESIGN GUIDELINES, MEAN FLEX BALL JT. ANGLE UPR amp LWR MAX. FLEX BALL JT. ANGLE UPR amp LWR - METH.A - ALLOWABLE STRESS 4 - METH.B - ALLOWABLE STRESS 4 1 These Guidelines apply to the Global Riser Response. 2 O y is the minimum yield strength of the material 3 All stresses are calculated according to von Mises stress failure criterion 1 These Guidelines apply to the Global Riser Response. 2 O y is the minimum yield strength of the material 3...

API RPlb T S Gis

Semi Submersible Riser System

Prior to ordering a new riser, a set of analyses should be carried out to establish the design specifications. At this time, the environmental conditions are chosen to reflect the maximum operating conditions expected during the design life. Design criteria such as maximum and alternating stresses are used in selection of parameters such as wall thickness and material properties. The analysis includes the performance of the drilling vessel and should also be used for specifying the vessel s...

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RP 16Q Design, Selection, Operation, and Maintenance of Marine Drilling Riser Systems 47 Gardner, T. N. and M. W. Cole 1982 Deepwater Drilling in High Current Environment, Offshore Technology Conference, OTC 4316. Garret, D. L. 1982 , Dynamic Analysis of Slender Rods, Trans, of AS ME, Journal of Energy Resources Technology, Vol. 104. Gelb, A. and W. E. Vander Velde 1968 , Multiple-Input Describing Functions and Nonlinear System Design, McGraw-Hill, New York, NY. Griffin, O. M., R. A. Skop and...