How Bit Profile and Gauges Affect Well Trajectory

Menand, Stéphane; Sellami, Hédi; Simon, Christophe; Besson, Alain; Silva, N. Da

doi:10.2118/82412-pa

Cited by 26 publications

(10 citation statements)

References 8 publications

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“…Furthermore, it contradicts the classical static assumption which states that cutting forces do not depend on the cutting velocity [31]. Indeed, most existing cutting models are static [37,12,11,30,16].…”

Section: The Pure Torsional Approachmentioning

confidence: 98%

Mitigating Stick-Slip in Deep Drilling Based on Optimization of PDC Bit Design

Pelfrene

Sellami

Gerbaud

2011

SPE/IADC Drilling Conference and Exhibition

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Deep-hole drillstring vibrations are an important cause of premature failure of drillstring components and drilling inefficiency. PDC bits are more susceptible to the stick-slip phenomenon characterized by intense RPM fluctuations of the drill bit. Based on full scale laboratory drilling tests and numerical simulations, this paper aims at understanding the dynamic behaviour of the bit/rock interaction and assessing how stick-slip depends on bit design (bit profile and diameter; cutters geometry and set up). It is generally assumed in the scientific and technical literature that forces acting on PDC cutters do not depend on cutter velocity. However, an extensive single cutter experimental program shows that these forces are rate-dependent for four tested carbonate rocks. This rate-effect is associated with the dynamic shearing of a layer of crushed rock carried away beneath the moving cutter. Based on these experiments, a semi-empirical rate-dependent cutter-rock interaction model is developed, implemented in a bit design software and used to predict the velocity signature of various PDC bit designs. These predictions fit well with numerous experimental results obtained using a full scale drilling bench. In particular, the model accounts for the negative damping effect, considered as the main source of stick-slip, and for important operational trends like an increasing risk of stick-slip in harder rocks, at higher weights-on-bit or for advanced cutter wear. The bit-rock interaction model is used as the boundary condition of a drillstring vibration software designed to perform a time-domain analysis of lumped systems. Simulations show that the bit design significantly impacts the risk of stick-slip. As a result, general optimization guidelines are suggested in order to improve PDC bit design.

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Section: The Pure Torsional Approachmentioning

confidence: 98%

Mitigating Stick-Slip in Deep Drilling Based on Optimization of PDC Bit Design

Pelfrene

Sellami

Gerbaud

2011

SPE/IADC Drilling Conference and Exhibition

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“…There has been significant work in measuring side cutting of bits and stabilizers in the past. 5,7,9,23,36,43 This work has been capitalized on with an extensive amount of lab test data collected for the side cutting response of bits in the drilling laboratory under controlled conditions. An example of this for four different gauge pad designs is shown in Figure 14.…”

Section: Dynamic Modelmentioning

confidence: 99%

“…[1][2][3] Over the last 30 years several models have been published to predict DLS based on the bit and BHA. [4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23] The experimental and analytical work in this area has significantly improved the state of the art and this continues today.…”

Section: Introductionmentioning

confidence: 99%

A Model for Borehole Oscillations

Pastusek

Brackin

2003

SPE Annual Technical Conference and Exhibition

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TX 75083-3836, U.S.A., fax 01-972-952-9435. AbstractThe presence of borehole rippling, spiraling, and hour-glassing have been known for many years in the drilling industry.Descriptions of these problems have become more precise with improved logging tools, yet the underlying mechanisms have not been mathematically formulated. Many directional models have been presented in the past that attempt to explain the steady state response of the bottom hole assembly, but little has been published on the non-equilibrium or dynamic response of the system.

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“…Internally the Limiter Redesign Process was renamed Fast Drill The FDBM initiative was the continued evolution of the Fast Drill Process. Research and field trials confirmed that poor borehole quality [12][13][14][15][16][17][18] (enlargement, borehole patterns, hole out of round, ledges, etc.) contributed significantly to drilling dysfunction and inadequate hole cleaning.…”

mentioning

confidence: 89%

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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How Bit Profile and Gauges Affect Well Trajectory

Cited by 26 publications

References 8 publications

Mitigating Stick-Slip in Deep Drilling Based on Optimization of PDC Bit Design

Mitigating Stick-Slip in Deep Drilling Based on Optimization of PDC Bit Design

A Model for Borehole Oscillations

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

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