Extension of Gauge Length to Reduce Vibrations and Improve Drilling Performance

Smyth, Gregory F.; Evans, Andrew; Babb, Jonathan; Bolivar, Neil

doi:10.2118/140317-ms

SPE/IADC Drilling Conference and Exhibition 2011

DOI: 10.2118/140317-ms

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Extension of Gauge Length to Reduce Vibrations and Improve Drilling Performance

Gregory F. Smyth¹,

Andrew Evans²,

Jonathan Babb³

et al.

Abstract: During extended reach drilling operations at the Hibernia Platform, operated by Hibernia Management and Development Company Ltd. utilizing ExxonMobil Canada Ltd. resources, bit gauge length and profile have been systematically varied to improve drilling performance while using a standard bottomhole assembly (BHA) and bit design. Prior to developing the standard BHA design and implementing a global performance management process, the ExxonMobil Fast Drill Process, multiple bit runs were required to drill a typi… Show more

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Cited by 7 publications

(1 citation statement)

References 15 publications

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“…An internal study revealed that major non-productive time (NPT) events were usually preceded by near misses such as pack-offs, tight hole, and/or cavings. In addition, this study showed that the flattening trend was associated with non-bit limiters, primarily borehole quality and self-induced hole cleaning ROP limits in high angle soft rock formations [7][8][9][10][11] . Identification of these non-bit limiters, near misses, and their root causes lead to the expansion of the Fast Drill Process to include Borehole Management limiters.…”

mentioning

confidence: 99%

Maximizing Capital Efficiency by Expanding the Limiter Redesign Process to Flat Time Operations

Valenta

Walker

Pastusek

et al. 2014

SPE Annual Technical Conference and Exhibition

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The operator's drilling efficiency program has been expanded to a Limiter Redesign Process that seeks to optimize all rig time, including flat time. As drilling efficiency gains have been achieved, flat time now accounts for roughly 80% of the total rig time and approximately 70% of the total cost of drilling and completions operations; leaving 20% of rig time for drilling. This fact led to the generation of a comprehensive Flat Time Reduction (FTR) program.The Fast Drill Process has become a well-known workflow to identify hole-making limiters and mitigate them through "relentless redesign to the economic limit of performance". Efforts to increase drilling efficiency continue, and this process has yielded a continuous increase in the overall footage per day and a reduction in flat time within individual hole sections.To address operations that do not include drilling of rock, the operator has launched a similar effort and workflow process which focuses on "flat time" portions of the well construction process. This has become a key focal point in the organizations approach to maximize capital efficiency. The Flat Time Reduction process provides an environment in which operations are optimized while further enhancing a workplace where "Nobody Gets Hurt."This process is yielding significant savings globally and has been accomplished through planning, "real-time" recognition and response, collaboration with service providers, and a focus on Non-Productive Time (NPT) reduction while continuously improving safety performance. Field applications of limiter redesign are discussed in this paper. The purpose of this paper is to present the current status and specific approaches being used to reduce flat time and share the workflow process.In 2004, the operator started a pilot program to determine if drilling performance could be improved by analyzing and reacting to trends in Mechanical Specific Energy (MSE) 1, 2, 3 by rig site personnel on a real time basis. MSE is a performance measurement parameter that approximates the bit's drilling efficiency and is a function of the weight-on-bit (WOB), surface torque, bit rotation per revolution (RPM) and the rate of penetration (ROP) for a given hole size. When the bit is drilling efficiently, MSE will be steady and will approximate the rock's confined compressive strength. When dysfunction occurs, MSE increases

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mentioning

confidence: 99%

Maximizing Capital Efficiency by Expanding the Limiter Redesign Process to Flat Time Operations

Valenta

Walker

Pastusek

et al. 2014

SPE Annual Technical Conference and Exhibition

View full text Add to dashboard Cite

show abstract

Eliminating Stick-Slip by Managing Bit Depth of Cut and Minimizing Variable Torque in the Drillstring

Davis

Smyth²,

Bolivar

et al. 2012

IADC/SPE Drilling Conference and Exhibition

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During extended reach drilling operations, stick-slip was identified within the operator’s Fast Drill Process™ workflow as the primary performance limiter in the 8-1/2-in. hole section. This dysfunction resulted in low penetration rates, frequent downhole tool failures, and bit damage. Subsequently, multiple bit runs were required to reach interval objectives. The redesign process identified two key solutions to mitigate stick-slip vibrations. First, the bit was redesigned to limit (or manage) the depth of cut to reduce the torque variations which can excite stick-slip. Second, the torsional stiffness of the drillstring was increased by changing from 5-1/2- to 5-7/8-in. drillpipe, which reduced the magnitude of the torsional oscillations. The systematic application of these design changes allowed higher weight on bit (WOB) to be applied without stick-slip dysfunction, resulting in significantly higher penetration rates. This paper presents the results of applying depth of cut control and drillstring design to eliminate stick-slip while drilling. Weight-on-bit, vibration, and penetration rate data will be presented over the course of eight wells. Results indicate the managed depth of cut and increased torsional stiffness provided significant reductions in vibrations leading to multiple field record rate of penetrations (ROPs), improved downhole tool life, and reduced bit damage.

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Collaborative Drilling Technical Team, Secures Project Performance

et al. 2013

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Advanced drilling technologies were used on two offshore multiwell platforms in the Lunskoye and Piltun-Astokhskoye fields, in the Sea of Okhotsk to deliver wells that required complex drilling to manage well-to-well collision risk, and to perform underreaming operations, extended-reach drilling (ERD), sidetracking, geosteering, and acquisition of thorough logging-whiledrilling (LWD) data.The project benefited from the successful implementation of a new concept that combined various groups of technical experts within the operating and service companies to address project challenges through proper well planning, 24/7 monitoring, and intervention, when needed, during the execution phase, as well as post-well analysis fed into the planning of subsequent wells.The effectiveness of the collaborative drilling technical team was proven by the overall results since implementing the new concept. Four wells were drilled "shoe to shoe" 25 days ahead of approved for expenditure (AFE) time for the drilling phase. More than 70 proactive interventions to prevent nonproductive time (NPT) were made and delivered to the drilling teams during trial runs; of these, 60% were considered significant and resulted in the implementation of a drilling and engineering operations planning service on subsequent wells. It was the first time in the Lunskoye field that a well had been delivered 8.9 days ahead of AFE for 53.6 days for the drilling phase. The success established good synergy among the client geoscientists and drilling personnel in town, platform teams, including the drilling supervisor (DSV) and offshore drilling engineer (ODE), and service companies providing mud logging services, drilling fluids, directional drilling and LWD services, and bits and underreamers.Thanks to the successful results obtained from the collaborative drilling technical team concept, it has been accepted for use in this major offshore project as it brings continuous improvement to drilling operations through a cyclic process of planning-execution-evaluation.

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Extension of Gauge Length to Reduce Vibrations and Improve Drilling Performance

Cited by 7 publications

References 15 publications

Maximizing Capital Efficiency by Expanding the Limiter Redesign Process to Flat Time Operations

Maximizing Capital Efficiency by Expanding the Limiter Redesign Process to Flat Time Operations

Eliminating Stick-Slip by Managing Bit Depth of Cut and Minimizing Variable Torque in the Drillstring

Collaborative Drilling Technical Team, Secures Project Performance

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