Field Data Supports the Use of Stiffness and Tortuosity in Solving Complex Well Design Problems

Rezmer-Cooper, Iain; Chau, Minh; Hendricks, A; Woodfine, Miriam; Stacey, B.J.; Downton, Neil

doi:10.2118/52819-ms

Cited by 24 publications

(3 citation statements)

References 13 publications

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“…Holes drilled by steerable motors can sometimes suffer hole quality issues [25][26][27] . Changing from rotating mode to sliding mode and back again can cause changes in borehole shape, ledges, and micro-doglegs.…”

Section: Steerable Motors and "Rotate / Slide" Drillingmentioning

confidence: 99%

Improving Hole Quality and Casing-Running Performance in Riserless Topholes—Deepwater Angola

Akers

2008

All Days

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The operator and co-venturers are developing several Angola Block 15 fields in water depths of up to 1400m. To date, 83 development wells and 33 exploration / appraisal wells have been drilled in the Block. Most have experienced hole quality issues in the riserless interval that manifests themselves as tight hole while tripping the BHA and abnormal/excessive drag running casing. In a few cases, casing could not be run to total depth (TD) and in one unfortunate case, the casing buckled in open water.There has been uncertainty as to the root cause of the hole quality issues which have been attributable to various factors since drilling was initiated. A review of available literature revealed very little published information on riserless drilling and casing running practices. The operator undertook a study of its riserless drilling and casing running practices in order to look for trends that may suggest certain sources as the root cause and to allow a re-examination of long-accepted practices. The study, combined with some new perspectives on directional drilling mechanics, has identified potential root causes not previously considered. Changes to drilling practices have resulted in improved riserless hole quality and smoother casing running operations.

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Section: Steerable Motors and "Rotate / Slide" Drillingmentioning

confidence: 99%

Improving Hole Quality and Casing-Running Performance in Riserless Topholes—Deepwater Angola

Akers

2008

All Days

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“…The force interaction between the casing and the wellbore occurs not only due to hole curvature and deviation. There are a variety of source of excessive drag : [3] -Well trajectory -Key Seats -Wellbore instability -Poor hole cleaning -Dog-Leg severity / poor directional control.…”

Section: Casing and Liner Dragmentioning

confidence: 99%

Casing and Liner Drag Forces as Design and Analysis Parameter for Complex Architecture Wells

Ciccola

2007

Latin American &Amp; Caribbean Petroleum Engineering Conference

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fax 01-972-952-9435. AbstractFrictional load losses during the tubular running into a wellbore are strongly associated with the well design. In complex architecture wells design, the drill string drag force is one of the most important analysis parameter. However, casing and liners drag forces are not proper considered, although differences between these types of pipes and the drill string can lead to significant changes in drag load levels.In this work, the influence of drag forces over casing and liner strings used in complex architecture wells is demonstrated. The study shows a numerical treatment of the problem and its validation through a model which calculates drag forces over the casing during running. In this way the prevalence of casing and liner drag forces as design parameter to be considered in conventional methodologies is demonstrated. The model involves stress and displacement calculations, using a recursive method, wich considers pipe discretization, stiffness of each pipe's element, and centralizer effects.The validation of the developed model was carried out with three wells located in the Santa Rosa field, Venezuela. The obtained calculations agreed with the actual values of hook loads, even in cases where the pipe got stuck, showing the model advantages for the design and analysis of complex architecture wells.

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“…Starting, running and restoring forces are used to characterize the performance of a bow spring sub. There are few software packages that can reliably predict this additional level of drag [14]. Most T&D models can be readily adapted to accommodate a bow spring centralizer model.…”

Section: Centralizer-formationmentioning

confidence: 99%

The Drilling and Casing Running Enigma

Mason

Chen

2006

Proceedings of SPE Annual Technical Conference and Exhibition

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TX 75083-3836, U.S.A., fax 01-972-952-9435. AbstractRunning casing in high angle and extended-reach wells is often recognized as one of the most demanding of all well construction operations. In such wells, frictional drag and unexpected downhole mechanical resistance can exceed available surface slack-off weight. The ability to reliably predict casing running performance will significantly help to reduce costs in challenging wells. Interestingly, a complex and often subtle relationship exists between a drilled wellbore and the subsequent casing run. This relationship is sometimes predictable and at other times surprisingly different. A key to resolving this enigma lies in understanding the many factors, such as wellbore quality, that influence the outcome of casing running operations. The paper reviews a number of topics that are considered key to understanding the relationship between drilling and casing running. Various results are illustrated using case studies from field operations.

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Field Data Supports the Use of Stiffness and Tortuosity in Solving Complex Well Design Problems

Cited by 24 publications

References 13 publications

Improving Hole Quality and Casing-Running Performance in Riserless Topholes—Deepwater Angola

Improving Hole Quality and Casing-Running Performance in Riserless Topholes—Deepwater Angola

Casing and Liner Drag Forces as Design and Analysis Parameter for Complex Architecture Wells

The Drilling and Casing Running Enigma

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