Quantifying Tortuosities by Friction Factors in Torque and Drag Model

Gaynor, Tom; Hamer, Doug; Chen, David C-K.; Stuart, Darren

doi:10.2118/77617-ms

Cited by 34 publications

(14 citation statements)

References 4 publications

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“…"We believe that back calculated friction factors are the most objective and reliable means of quantifying hole quality, rather than convoluted measurements of angular change" [10].…”

Section: Review Of Wellbore Qualitymentioning

confidence: 99%

The Perfect Wellbore!

Mason¹,

Chen²

2005

Proceedings of SPE Annual Technical Conference and Exhibition

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TX 75083-3836, U.S.A., fax 01-972-952-9435. AbstractWellbore quality is a term frequently used in the drilling community; however its meaning is not well understood, its context frequently confused and its value underestimated. For most drilling engineers, a quality wellbore is one associated with a directionally drilled borehole that is smooth, in-gauge, and has minimal spiralling. The claimed benefits of such a wellbore includes improved drilling performance, ease of running casing, better logging tool response, and highly competent cement jobs. To date it has been too difficult or too complex to relate such benefits to wellbore quality in a meaningful and measurable way. In order to reduce existing subjectivity, a procedure has been devised whereby wellbore quality can be measured in a practicable way. This resulting process is embedded in what is called the Wellbore Quality Scorecard (WQS). The system works by individually scoring drilling, tripping-out and casing running responses for any drilled hole section. A total score ranging from 0 to 20 is computed, where 20 is considered to be "The Perfect Wellbore". This represents significantly better than expected torque and drag responses from drilling, tripping-out of hole and casing running. Practical applications of the WQS are demonstrated on both horizontal and extended-reach wells.

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“…"We believe that back calculated friction factors are the most objective and reliable means of quantifying hole quality, rather than convoluted measurements of angular change" [10].…”

Section: Review Of Wellbore Qualitymentioning

confidence: 99%

The Perfect Wellbore!

Mason¹,

Chen²

2005

Proceedings of SPE Annual Technical Conference and Exhibition

View full text Add to dashboard Cite

show abstract

“…From the results of the case studies, trajectory controls by use of the minimum-energy method are shown to yield a smooth well path. A smooth well path, meaning less local dogleg severity and microtortuosity, helps reduce wellbore friction (Aadnoy and Andersen 1998;Gaynor et al 2002;McCormick and Wilcox 2013;Menand 2013). Wellbore friction is a limiting factor of the depth of horizontal drilling.…”

Section: Discussionmentioning

confidence: 99%

Wellbore-Trajectory Control by Use of Minimum Well-Profile-Energy Criterion for Drilling Automation

Liu

Samuel

2016

SPE Journal

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When the actual well path deviates from the planned path, it is imperative for a drilling system to take corrective actions. A new trajectory-control model has been developed on the basis of a minimum well-profile-energy criterion to achieve smooth well paths. In this model, the S-shaped returning path from a deviated position to the planned wellbore trajectory is divided into two sections, each of which has its length, inclination-change rate, and azimuth-change rate. Different trajectory-calculation algorithms are used to solve the deviation-correction parameters of the two sections. Results obtained from the simple balanced tangential method, the industry-standard minimum-curvature method, and the more-accurate natural-curve method are consistent with one another. The model was tested by use of wellbore-trajectory simulations of different 2D and 3D well paths. The simulation results show that the new trajectory-control model, in comparison with proportional-integral-derivative (PID) -control and fuzzy-control methods, yields much-smoother wellbore trajectories. Consequently, the new model is promising for the reduction of torque, drag, and friction of the drillstring.Unlike PID-and fuzzy-control methods, which usually require subjective entry of several controller parameters, the new trajectory-control model provides deterministic solutions on the basis of an objective minimum-energy criterion, which represents a significant advantage for the limited computation power of downhole tools. In addition, the settings of constant inclination-and azimuth-change rates in each correction section also provide benefits, such as requiring less-frequent steering, resulting in reduced electric-power consumption and reduced abrasion failure of downhole tools.

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“…It is readily acknowledged that many benefits associated with improved wellbore quality have been claimed [1][2][3][4][5][6] . In this section each potential benefit is assessed to see how well each is reflected in the WQS process.…”

Section: Wqs Benefit Analysismentioning

confidence: 99%

“…It is generally accepted that good wellbore quality positively impacts drilling and completion operations [1][2][3][4][5][6] . Claimed benefits specifically include: improved hole cleaning efficiency; higher rate of penetration (ROP); reduced tortuosity; lower torque and drag (T&D) levels; reduced wellbore spiralling; more in-gauge hole; decreased vibration; fewer tool failures; prolonged bit life; improved logging tool responses; more competent cement jobs; easier casing and completion runs.…”

Section: Introductionmentioning

confidence: 99%

The Wellbore Quality Scorecard (WQS)

Mason

Chen

2006

All Days

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TX 75083-3836, U.S.A., fax 1.972.952.9435. AbstractWellbore quality is a term commonly used in the drilling community; however its meaning is not consistently understood, its context sometimes confused and its value to the industry unknown. For many drilling engineers, a quality wellbore is most often associated with a directionally drilled borehole that is smooth, in-gauge, and has minimal spiralling. Some of the claimed benefits of such a wellbore include enhanced drilling performance, ease of running casing, improved logging tool responses and superior cement jobs. To date it has been too difficult or too complex to directly relate such benefits to wellbore quality in a meaningful way. This paper describes a new initiative which has the aim of reducing subjectivity around the quantification of wellbore quality. The resulting scheme is a process which is embedded in what is called the Wellbore Quality Scorecard (WQS).

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Quantifying Tortuosities by Friction Factors in Torque and Drag Model

Cited by 34 publications

References 4 publications

The Perfect Wellbore!

The Perfect Wellbore!

Wellbore-Trajectory Control by Use of Minimum Well-Profile-Energy Criterion for Drilling Automation

The Wellbore Quality Scorecard (WQS)

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