The Critical Buckling Force and Stresses for Pipe in Inclined Curved Boreholes

Schuh, F.J.

doi:10.2118/21942-ms

Cited by 29 publications

(5 citation statements)

References 2 publications

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“…Having derived equations for straight wells (vertical, inclined and horizontal), some authors extended existing equations for curved borehole (Schuh et al 11 ) or developed new theories for tubular strings in curved wells (Kyllingstad et al 12 ).…”

Section: Theoretical Workmentioning

confidence: 99%

Which Material is Less Resistant to Buckling: Steel, Aluminum or Titanium Drill pipe?

2011

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Access to reservoirs in ultra-deep and extended reach drilling projects leads the industry to develop new resistant and higherstrength materials. Drilling equipments manufacturers and drilling contractors have to meet higher requirements of operators to manufacture and operate quality tubulars in these severe environments. However, with the increasing complexity (deep, long, high-pressure/high-temperature, sour service) of drilled wells, steel may become a limiting drill pipe material. A nonsteel alternative material may exist such as aluminum, titanium or composite materials. Buckling of steel, aluminum and titanium tubulars inside wellbore has been the subject of researches and articles in the past. According to some authors, the light Young Modulus of lightweight drill pipes does not affect their buckling response: the relative low stiffness of the pipes would be balanced by reduced contact forces with the wellbore. This paper presents a full study discussing clearly the buckling response of steel and lightweight drill pipes in both experimental bench and real field conditions. This paper shows a full comparative study between steel, aluminum and titanium drillstrings in Extended Reach Drilling (ERD) wells and studies the opportunity to use aluminum and titanium drillstring in ERD wells while the buckling, drilling efficiency and drillstring integrity stay acceptable. Critical buckling loads for each drill pipe material and dimension is reviewed and presented, using our numerical model and in the form of charts which could be used by drilling engineers. Along this comparison, we also focus on drillstring rotation, tool-joints and dimensions effects on buckling loads. Finally, this paper should give a better comprehension of the mechanical behavior of lightweight material for drill pipe, which can improve significantly well planning to drill wells with an increasing depth, length and complexity. State of the art

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Section: Theoretical Workmentioning

confidence: 99%

Which Material is Less Resistant to Buckling: Steel, Aluminum or Titanium Drill pipe?

2011

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“…Modified sinusoidal buckling is defined by Schuh, 1991, and is widely used today by the industry. Helical buckling is defined by Mitchell, 2008, andKwon, 1988.…”

Section: Buckling Analysismentioning

confidence: 99%

Drilling Deep in Deep Water: What It Takes to Drill Past 30,000 ft

2010

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In 1919 the world record for the deepest well was broken by the Hope natural gas company with a total depth (TD) of 7,579 ft. Although it took over 3 years to reach TD, only 325 days were spent actually drilling. Today in deepwater operations, the water depth alone can exceed this record, and operators have drilled past 30,000 ft in just 4 or 5 months. Technology and procedures have evolved extensively as operations that appeared impossible a decade ago are now considered routine. Today, operators are being pushed more than before, not just to explore deeper prospects, but also to get there efficiently. The future of the industry depends on it. Now there are new questions the industry is asking about deep water: What is different about drilling deep in deepwater operations? What does it actually take to drill the deepest wells in the world today? Currently, there are only a handful of personnel with the knowledge and experience to execute these wells. This paper will discuss the challenges of planning and drilling directional wells in excess of 30,000 ft true vertical depth (TVD) and will also look at lessons from some of the major deepwater Gulf of Mexico (GoM) operations that have successfully drilled wells beyond this mark and are continuing to push the envelope further. These wells have held, at one time or another, records for deepest wells drilled in many categories in recent years. IntroductionMany of the deepest wells in the world have been drilled in the GoM, and many have been in deep water. Fig. 1 illustrates the trends in total TVD of the wells for the GoM. Fig. 2 illustrates the trend in increasing water depths with time for wells in the GoM. The direction that the industry is heading in is deeper: deeper water and deeper wells. The technology exists to take us there. However, there are critical factors to consider when planning these wells.

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“…In 1991 Schuh 28 presented an analysis of the influence of curvature on the critical buckling force. In that work buckling equations derived to straight sections of the well were extended to be used in curved boreholes by an adjust of the pipe geometry to take into account the shape of the buckled pipe in the curved wellbore.…”

Section: Literature Reviewmentioning

confidence: 99%

Buckling of Tubulars Inside Wellbores: A Review on Recent Theoretical and Experimental Works

Cunha¹

2003

Proceedings of SPE Production and Operations Symposium

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TX 75083-3836 U.S.A., fax 01-972-952-9435. AbstractBuckling behavior of tubulars inside wellbores is the major subject of many articles. This paper presents a general overview on most of the material available in the literature on the subject and also comments on the different, and sometimes conflicting solutions presented in various works.Different aspects of the phenomenon are discussed including sinusoidal (lateral) and helical buckling and influence of torque.

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The Critical Buckling Force and Stresses for Pipe in Inclined Curved Boreholes

Cited by 29 publications

References 2 publications

Which Material is Less Resistant to Buckling: Steel, Aluminum or Titanium Drill pipe?

Which Material is Less Resistant to Buckling: Steel, Aluminum or Titanium Drill pipe?

Drilling Deep in Deep Water: What It Takes to Drill Past 30,000 ft

Buckling of Tubulars Inside Wellbores: A Review on Recent Theoretical and Experimental Works

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