Evaluation of Heave-Induced Dynamic Loading on Deepwater Landing Strings
- S. DeWayne Everage (T.H. Hill Associates Inc.) | Nanjiu Zheng (T.H. Hill Associates Inc.) | Sean E. Ellis (T.H. Hill Associates Inc.)
- Document ID
- Society of Petroleum Engineers
- SPE Drilling & Completion
- Publication Date
- December 2005
- Document Type
- Journal Paper
- 230 - 237
- 2005. Society of Petroleum Engineers
- 5.1 Reservoir Characterisation, 1.4 Drillstring Design, 1.2.5 Drilling vibration management, 1.10 Drilling Equipment, 2.1.7 Deepwater Completions Design, 1.10.1 Drill string components and drilling tools (tubulars, jars, subs, stabilisers, reamers, etc), 1.6.1 Drilling Operation Management, 4.3.4 Scale, 1.6 Drilling Operations, 1.4.4 Drill string dynamics, 2 Well Completion
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With current landing-string tensile loads approaching 1,500 klbf, deepwaterdrilling programs are quickly eliminating comfortable design margins.Consideration of static loading alone in these cases can sometimes beinsufficient.This paper provides a mathematical model to predict dynamicaxial loads imposed on a deepwater landing string by a drillship's response toocean waves. The model can be adapted to a given landing string's geometric andmechanical constraints. The model will help the user identify the correctopportunity for pausing a landing operation when seastates are increasing inintensity, or alternatively, may enable the user to continue deepwater landingoperations with increased confidence during what may be considered marginalconditions.
Landing heavy, large-diameter casing strings from dynamically positioneddrillships in deep water is becoming much more common. As static tensile loadsapproach the capacity of today's landing strings, considering the effects ofadditional dynamic loads becomes critical for preventing overload.Dynamicloads caused by vessel heave are imparted to the drillstring when it is sitting"stationary" in the slips and when it is suspended from the elevators at loadsgreater than those the motion compensator can absorb.
Drillstring vibration, known to be responsible for many drillstringfailures, has been extensively studied in the past. Pioneering works includethe study of dynamic loading of drillpipe (a) while tripping1 and (b) while rotary drilling.2 Fortripping, drillstring vibration (considered impulse excitation) was caused byadding a stand of drillpipe and then setting the slips.During trippingoperations, the top of the drillstring experiences a sudden change in velocitywithin a short period of time (impulse) before reaching constant trippingspeed.For rotary drilling, longitudinal and torsional drillstringvibration are considered as periodic variation in bit force (acceleration)caused by bit/formation interaction, commonly referred to as stick/slip and bitbounce.
|File Size||742 KB||Number of Pages||8|
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2. Dareing, D. and Livesay, B.: "Longitudinal and Angular DrillstringVibrations with Damping," J. of Engineering for Industry (1968) 671-678;Trans., ASME, 90.
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