Hole Quality: Gateway to Efficient Drilling

Chen, David C-K.; Gaynor, Tom; Comeaux, Blaine; Glass, Kevin

doi:10.4043/14277-ms

Cited by 16 publications

(6 citation statements)

References 2 publications

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“…Field data indicate that generating a straighter; high-quality wellbore has improved almost every aspect of drilling. These improvements include lower vibration, better bit life, fewer tool failures, faster drilling, better hole cleaning, lower torque and drag, better logging tool response, and better casing and cement jobs" [12].…”

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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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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“…• The model is formulated at the length scale of the BHA with the rest of the drillstring accounted for at the upper boundary of the BHA through a force and a moment computed from a torqueand-drag model (Menand et al 2006;Denoel and Detournay 2011). This simplification is derived from the observation that the lateral force and moment at the bit are influenced predominantly by the components of the BHA and the contact points with the borehole that are closest to the bit.…”

Section: Model Of Borehole Propagationmentioning

confidence: 99%

Analysis of Spiraled-Borehole Data by Use of a Novel Directional-Drilling Model

Marck

Detournay

Kuesters

et al. 2014

SPE Drilling &Amp; Completion

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This paper describes the application of a directional-drilling model to the phenomenon of wellbore spiraling and compares its predictions with field data. The spiraling tendency of a bottomhole assembly (BHA) is determined from a stability analysis of the delay differential equations (DDEs) that govern the propagation of a borehole. These propagation equations are derived from a novel mathematical model, constructed by combining a bit/rock-interaction law, which relates the force and moment acting on the bit to its penetrations per revolution through the rock; kinematic relationships, which link the bit motion to the local borehole geometry; and a model for the BHA, which expresses the force and moment at the bit as a function of the external loads and the deflection imposed by the stabilizers. Spatial delays, associated with the positions of the stabilizers, account for the feedback of the borehole geometry as the stabilizers interact with the wellbore.The analytical form of the propagation equations makes it possible to perform a stability analysis and determine whether borehole spiraling is expected. The coefficients of the propagation equations embody the characteristics of a particular drilling system; these include the BHA configuration, bit properties, and the active weight W a , a reduced downhole weight on bit (WOB) that depends on the actual downhole WOB, the state of wear of the bit, and the rock strength. If the bit trajectory is unstable, then any perturbation in the borehole geometry is amplified gradually, eventually leading to the generation of a spiraled hole.The stability of the bit trajectory essentially is controlled by the magnitude of a dimensionless group, a function of the lateralsteering resistance of the bit, the active weight, and properties of the BHA, relative to a critical value that depends only on the BHA configuration.Predictions of the stability analysis are compared with field data from spiral holes pertaining to eight sections from four wells drilled with different bit types and BHA configurations. The paper shows that the propensity of a BHA to spiral can be estimated by the model by assuming reasonable values for parameters such as the lateral-steering resistance and the part of the WOB transmitted by the cutter wear flats. This ability means that the model can be used to optimize BHA designs and determine critical WOB levels, both of which will mitigate the creation of spiraled holes.

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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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Hole Quality: Gateway to Efficient Drilling

Cited by 16 publications

References 2 publications

The Perfect Wellbore!

The Perfect Wellbore!

Analysis of Spiraled-Borehole Data by Use of a Novel Directional-Drilling Model

The Wellbore Quality Scorecard (WQS)

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