Design Evolution of Drilling Tools to Mitigate Vibrations

Bailey, Jeffrey R.; Elsborg, C.; James, R. W.; Pastusek, Paul; Prim, Matthew Thomas; Watson, William

doi:10.2118/163503-ms

Cited by 5 publications

(1 citation statement)

References 15 publications

(6 reference statements)

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“…Key elements of this drilling efficiency program included vibration modeling and optimization of the bottom hole assembly (BHA) configuration [25][26][27][28] , bit redesign and depth of cut control elements [29][30][31][32] , use of larger diameter drill pipe 33 , and field trials of an active damping top-drive torque control system 34 . In addition, a real-time drilling parameter optimization system was developed to continuously monitor the Mechanical Specific Energy (MSE) while drilling 35,36 .…”

Section: Fast Drill Process Extensionsmentioning

confidence: 99%

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

et al. 2014

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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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Section: Fast Drill Process Extensionsmentioning

confidence: 99%

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

et al. 2014

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Expanding the Extended Reach Envelope at Chayvo Field, Sakhalin Island

Gupta

Yeap²,

Fischer³

et al. 2014

IADC/SPE Drilling Conference and Exhibition

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The second drilling campaign at the Chayvo field, located offshore Sakhalin Island, targeted the development of a new reservoir zone using extended reach wells from onshore. A total of 4 oil producers and 1 gas injector were planned to develop the northern portion of the reservoir. To effectively drain the east and west flanks of this reservoir, record length wells beyond the current extended reach drilling (ERD) envelope were required. Key challenges included high torque and drag, wellbore positioning in a thin oil column, wellbore stability, long horizontal completions, and downhole tool telemetry. This paper describes the Operator's experience with drilling these challenging wells that resulted in several new ERD records. Key well design features, equipment upgrades, and lessons learned will be discussed. ERD is an established technique to economically access reserves from existing infrastructure, reducing the need for additional drill centers and consequently reducing the drilling and facilities environmental footprint. Continuing advancement of the ERD envelope along with delivering cost-effective wells will further maximize the benefits of this technique. The case history described in this paper illustrates that the advancement of the ERD envelope is possible through detailed planning, technical design, and operational excellence. The planning of these wells built upon the Operator's previous ERD experience along with additional tools and techniques. Three of the project wells set new worldwide ERD records for measured depth; the longest well, Z-42, established new records for measured depth (12,700m) and horizontal reach (11,739m). Completion designs were optimized to successfully run a ∼3,600m long open hole completion, and the well was finished in ∼70 days. As a result of this successful development, additional wells are being planned in conjunction with technology advancement initiatives that will push the ERD measured depth envelope to 13km and longer.

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Nonlinear Drillstring-Dynamics Modeling of Induced Vibrations in Unconventional Horizontals

Wilson¹,

Heisig²

2015

SPE Drilling &Amp; Completion

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Summary Inducing vibrations while drilling is a relatively new concept that shows promise in directional applications. Instigating motion of the drillstring, particularly in the sections lying on the low-side of the wellbore, can lead to substantial improvements in managing the two limiting factors of the long horizontal wells that are typically associated with current unconventional shale plays: removal of formation cuttings from the borehole and frictional drag between nonrotating drillstrings and the wellbore wall. Minimizing these effects by introducing controlled vibrations increases the overall drilling efficiency and reduces the cost associated with the well. The difficulty in implementing such actions, however, is consistency. Because the behavior of drilling assemblies is inherently nonlinear, it has been difficult in the past to reliably predict their response to dynamic events. This, in turn, creates a challenge when trying to optimize the performance of arbitrary vibration-inducing devices (VIDs). This study presents a detailed analysis of the fully coupled, 3D, nonlinear behavior of drillstrings under the action of induced vibrations. Specific focus is given to the dynamic characteristics of a drillstring, during horizontal-drilling operations, in long unconventional wells and how this behavior affects the success of the well. The response of the drillstring, due to induced axial and lateral oscillatory motions, is examined through linearized dynamic analysis and nonlinear time-domain simulations. Solutions obtained from the study provide a clearer understanding of the dynamics experienced downhole and lead to suggestions for improved practices when drilling with lateral VIDs, particularly with regard to hole cleaning. Further insights into the sliding behavior of the drillstring, during the use of these types of tools, are drawn from animated modeling results. Finally, the future applications of this technology are discussed.

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Design Evolution of Drilling Tools to Mitigate Vibrations

Cited by 5 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

Expanding the Extended Reach Envelope at Chayvo Field, Sakhalin Island

Nonlinear Drillstring-Dynamics Modeling of Induced Vibrations in Unconventional Horizontals

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