The Experts below are selected from a list of 282 Experts worldwide ranked by ideXlab platform
Graham Mensa-wilmot - One of the best experts on this subject based on the ideXlab platform.
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Technology Focus: Bit Technology and Bottomhole Assemblies (December 2018)
Journal of Petroleum Technology, 2018Co-Authors: Graham Mensa-wilmotAbstract:Technology Focus Rock characterization, with regard to determination of mechanical and geologic properties, is critical for performance drilling. This consideration ensures appropriate offsets analysis. Additionally, it promotes several benefits in project planning and execution, with regard to Bottomhole-Assembly (BHA) design and compliance analysis, drive-system evaluations, bit selections, hydraulics considerations, drilling-parameter ranges, and anticipation of operational dysfunctions. Performance drilling, when deployed holistically, contributes to cycle-time and project-cost reductions. In most instances, hardness is considered to be the most critical rock property in bit-selection discussions. Field performances, and results from this classification, have not been consistent with this claim. Recent research shows that, in addition to hardness, other rock properties, such as lithology types, heterogeneity, and abrasiveness, have equal importance in bit evaluations. Consequently, the discussion must move from rock-strength analysis to rock-drillability analysis, which is more inclusive. BHAs must achieve their expected functional roles without creating vibrations or conditions that compromise project success. Vibration events commonly have been tied to BHAs or drill bits. Efforts aimed at addressing vibration challenges through bit and BHA changes have not produced the desired results. Researchers have identified additional influences (e.g., drilling parameters, drilling fluid types, rock-drillability factors, stabilizer types and geometries, reamers, wellbore trajectory, and drive systems) that also serve as vibration sources. Consequently, strategies or solutions aimed at addressing vibration challenges must target their sources to ensure effectiveness of such solutions. Performance consistency, aided by effective bit-wear predictions, promotes cycle-time reduction. Improvements in rock-drillability analysis, bit selection, BHA design, drilling-parameter selections, and vibration remediation, coupled with the industry’s advancements in downhole-tool development and data analytics, must ensure appropriate monitoring and prediction of bit wear. Research must delve into the different bit-failure modes—wear and impact, different wear stages, and the totality of factors that drive the wear process. Recommended additional reading at OnePetro: www.onepetro.org. IADC/SPE 189697 Real-Time Downhole Data Resolve Lithology-Related Drilling Behavior by Christopher Viens, Nabors Drilling Solutions, et al. SPE 187445 Real-Time Bit-Wear Prediction Using Adaptive Data Analytics by Vikrant Lakhanpal, University of Houston, et al. SPE 188427 Experimental Investigation of the Effects of Rotational Speed and Weight on Bit on Drillstring Vibration, Torque, and Rate of Penetration by Vimlesh A. Bavadiya, University of Oklahoma, et al.
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Technology Focus: Bit Technology and Bottomhole Assemblies (December 2009)
Journal of Petroleum Technology, 2009Co-Authors: Graham Mensa-wilmotAbstract:Performance Drilling—Moving Beyond the Basics The industry's continuous push into harsher and more-challenging drilling environments, in terms of formation types, depths, and well profiles, presents several performance challenges. Performance drilling is accepted widely as one of the enablers that will help reverse the high-cost implications of this trend. Consequently, the drive to understand the basics, as it relates to this realization, has preoccupied the industry for some time now. This effort, which has focused primarily on elements such as rock mechanics and failure mechanisms, Bottomhole-Assembly (BHA) design, drilling mechanics and hydraulics, and the operational environment, has proved highly beneficial. Extensive amounts of data have been collected as a result of this focus. Additionally, several performance-enhancing tools and processes have been developed. Having deepened our understanding of the basics, we now must question data to reveal how and why events occur—successes as well as failures. Through this process, we must identify trends, behaviors, and relationships. These observations must be explained because we have the basics. We cannot expect to improve, and effectively confront our looming challenges, when we merely recycle the basics. Performance-improvement objectives will be met only if we turn data into action-able information. There are tools to help design and understand BHA performance. In addition, there is agreement on the different vibration modes. Field data clearly establish the need for different bit technologies and for different drive mechanisms [e.g., positive-displacement motor, rotary-steerable-system (RSS) "push the bit," or RSS "point the bit"]. Contrary to what computer programs and models sometimes tell us, reality must always be considered as an option. We have the data and the understanding—now we need to move beyond the basics. Bit Technology and Bottomhole Assemblies additional reading available at OnePetro: www.onepetro.org IPTC 11945 • "State-of-the-Art BHA Program Produces Unprecedented Results" by David C-K Chen, SPE, Halliburton, et al. SPE 119375 • "Roller Reamers Improve Drilling Performance in Wells Limited by Bit and Bottomhole-Assembly Vibrations" by Steven F. Sowers, SPE, ExxonMobil, et al. SPE 119302 • "Experimental Study of MSE of a Single PDC Cutter Under Simulated Pressurized Conditions" by Navid Rafatian, SPE, Schlumberger, et al.
Emmanuel M Detournay - One of the best experts on this subject based on the ideXlab platform.
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Influence of Rotary-Steerable-System Design on Borehole Spiraling
SPE Journal, 2016Co-Authors: J.. Marck, Emmanuel M DetournayAbstract:Summary The paper investigates the influence of the design of push-the-bit rotary-steerable systems (RSSs) on the tendency to drill spiraled boreholes by analyzing the directional stability of the bit trajectory. In this model, differences in RSS designs are accounted for conceptually by assigning a lateral stiffness to the RSS pads. This simple device, which introduces a dependence of the force on the pads upon the deflection of the Bottomhole Assembly (BHA) relative to the borehole axis, enables exploration of the influence of the actuation mechanism, with the RSS behaving at the ends of the spectrum either as a soft or as a stiff node of the drilling structure. According to this analysis, low pad stiffness has little consequence on the general behavior of the system. However, as the pad stiffness increases, any perturbation in the borehole geometry sensed by the pads alters the drilling direction of the bit and triggers, under certain conditions, self-excited oscillations in the borehole geometry. By increasing the transverse rigidity of the BHA in the vicinity of the bit, stiff RSS pads thus enhance the propensity of a drilling structure to drill spiraled holes and generate, if the system is directionally unstable, borehole oscillations with pitch that corresponds to the distance between the bit and the pads. In contrast, a directionally unstable BHA equipped with RSS characterized by a low stiffness produces spiraled holes with a wavelength corresponding to the distance between the bit and the first stabilizer.
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Equilibrium Inclinations of Straight Boreholes
SPE Journal, 2013Co-Authors: Luc Perneder, Emmanuel M DetournayAbstract:Summary This paper describes a directional drilling model for calculating the equilibrium inclination of straight boreholes, considering a Bottomhole Assembly (BHA) with a “push-the-bit” rotary steerable system (RSS). The model yields closed-form expressions for the magnitude and orientation of the RSS pad force, which is required to maintain the inclination of the borehole. The explicit dependence of the RSS force on the positions of the stabilizers and the RSS, on the mechanical properties of the BHA, on the characteristics of the bit, and on the weight on bit enables the identification of particular cases of practical significance.
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CCA - Steady-state solutions of a propagating borehole: Helical trajectory
2011 IEEE International Conference on Control Applications (CCA), 2011Co-Authors: Luc Perneder, Emmanuel M DetournayAbstract:Deep boreholes with complex geometries are now drilled with the help of rotary steerable systems (RSS), which are downhole robots capable of steering the bit by either applying a force on the borehole walls (push-the-bit systems) or by tilting the bit (point-the-bit systems). This paper explores the existence of stationary borehole geometries in the form of vertical helical trajectories. These non-trivial solutions, which represent the equilibrium points of the dynamical equations governing the evolution of the borehole, correspond to situations where the deformed configuration of the Bottomhole Assembly (BHA) remains invariant during the propagation of the borehole, i.e., the BHA moves inside the created borehole as a rigid body. Formulation of the model yields a system of linear equations in terms of the radius and pitch of the helical boreholes. A parametric analysis of the solution for the idealized case of rigid BHA with one stabilizer shows the region of existence of helical trajectories and the dependence of the pitch and radius of the helix on the control parameters.
Murtadha J. Altammar - One of the best experts on this subject based on the ideXlab platform.
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Coil Tubing Fill Cleanout Implemented on Plugged Stand Alone Screens: Highly Successful Campaign in Saudi Arabian Gas Producers
All Days, 2012Co-Authors: Murtadha J. Altammar, Khalid Saeed Asiri, Saad M. Al-driweesh, Mohammed A. AsiriAbstract:Abstract Gas wells in Field X, south of the giant Ghawar Field, are completed with stand alone screens across a Pre-Khuff sandstone formation as a sand control measure. Although prolific producers, some suffer a severe decline in performance after a period of production, triggering diagnostic work to be performed. Consequently, screen plugging is confirmed and collected samples of present fill are analyzed. Results called for a coil tubing cleanout campaign in order to restore lost productivity. The objective of this paper is to detail the whole operation journey of the fill cleanout jobs that includes fill diagnostic process, assessment of cleanout methods, initial job design, choice of fluids, CT Bottomhole Assembly tools, execution and field experience, and post-cleanout performance evaluation. A CT wiper trip method has been implemented with either milling or jetting tools. A newly developed rate-activated circulation valve is deployed to aid in lifting solids at high pumping rates as well as jetting acid across the screen interval after fill removal. The fill cleanout campaign has been very successful in restoring well productivity as compared to pre-cleanout and initial post-drilling well performance. A total of 340 MMSCFD of incremental gas rate were restored to-date from 16 cleanout operations. Unprecedentedly, interesting and valuable findings are shared regarding the nature of fill formed inside and/or above the stand alone screens, recommended milling practices to protect CT Bottomhole Assembly and minimize CT fatigue, the experience of incorporating acid jetting and squeeze in the CT wiper trip method to stimulate damaged formation pack behind the screens, and the preventive measures taken to cope with the fill accumulation issue.
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Coil Tubing Fill Cleanout and Near-Wellbore Acidizing of Plugged Stand Alone Screens: Highly Successful Campaign in Saudi Arabian Gas Wells
All Days, 2012Co-Authors: Murtadha J. Altammar, Khalid Saeed Asiri, Saad M. Al-driweesh, Nahr M. AbulhamayelAbstract:Abstract Gas wells in Field X, south of the giant Ghawar Field, are completed with stand alone screens across a Pre-Khuff sandstone formation as a sand control measure. Although prolific producers, some suffer a severe decline in performance after a period of production, triggering diagnostic work to be performed. Consequently, screen plugging is confirmed and collected samples of present fill are analyzed. Results called for a coil tubing cleanout campaign in order to restore lost productivity. The objective of this paper is to detail the whole operation journey of the fill cleanout jobs that includes fill diagnostic process, assessment of cleanout methods, initial job design, choice of fluids, CT Bottomhole Assembly tools, execution and field experience, and post-cleanout performance evaluation. A CT wiper trip method has been implemented with either milling or jetting tools. A newly developed rate-activated circulation valve is deployed to aid in lifting solids at high pumping rates as well as jetting acid across the screen interval after fill removal. The fill cleanout campaign has been very successful in restoring well productivity as compared to pre-cleanout and initial post-drilling well performance. A total of 340 MMSCFD of incremental gas rate were restored to-date from 16 cleanout operations. Unprecedentedly, interesting and valuable findings are shared regarding the nature of fill formed inside and/or above the stand alone screens, recommended milling practices to protect CT Bottomhole Assembly and minimize CT fatigue, the experience of incorporating acid jetting and squeeze in the CT wiper trip method to stimulate damaged formation pack behind the screens, and the preventive measures taken to cope with the fill accumulation issue.
Nahr M. Abulhamayel - One of the best experts on this subject based on the ideXlab platform.
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Coil Tubing Fill Cleanout and Near-Wellbore Acidizing of Plugged Stand Alone Screens: Highly Successful Campaign in Saudi Arabian Gas Wells
All Days, 2012Co-Authors: Murtadha J. Altammar, Khalid Saeed Asiri, Saad M. Al-driweesh, Nahr M. AbulhamayelAbstract:Abstract Gas wells in Field X, south of the giant Ghawar Field, are completed with stand alone screens across a Pre-Khuff sandstone formation as a sand control measure. Although prolific producers, some suffer a severe decline in performance after a period of production, triggering diagnostic work to be performed. Consequently, screen plugging is confirmed and collected samples of present fill are analyzed. Results called for a coil tubing cleanout campaign in order to restore lost productivity. The objective of this paper is to detail the whole operation journey of the fill cleanout jobs that includes fill diagnostic process, assessment of cleanout methods, initial job design, choice of fluids, CT Bottomhole Assembly tools, execution and field experience, and post-cleanout performance evaluation. A CT wiper trip method has been implemented with either milling or jetting tools. A newly developed rate-activated circulation valve is deployed to aid in lifting solids at high pumping rates as well as jetting acid across the screen interval after fill removal. The fill cleanout campaign has been very successful in restoring well productivity as compared to pre-cleanout and initial post-drilling well performance. A total of 340 MMSCFD of incremental gas rate were restored to-date from 16 cleanout operations. Unprecedentedly, interesting and valuable findings are shared regarding the nature of fill formed inside and/or above the stand alone screens, recommended milling practices to protect CT Bottomhole Assembly and minimize CT fatigue, the experience of incorporating acid jetting and squeeze in the CT wiper trip method to stimulate damaged formation pack behind the screens, and the preventive measures taken to cope with the fill accumulation issue.
Mohammed A. Asiri - One of the best experts on this subject based on the ideXlab platform.
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Coil Tubing Fill Cleanout Implemented on Plugged Stand Alone Screens: Highly Successful Campaign in Saudi Arabian Gas Producers
All Days, 2012Co-Authors: Murtadha J. Altammar, Khalid Saeed Asiri, Saad M. Al-driweesh, Mohammed A. AsiriAbstract:Abstract Gas wells in Field X, south of the giant Ghawar Field, are completed with stand alone screens across a Pre-Khuff sandstone formation as a sand control measure. Although prolific producers, some suffer a severe decline in performance after a period of production, triggering diagnostic work to be performed. Consequently, screen plugging is confirmed and collected samples of present fill are analyzed. Results called for a coil tubing cleanout campaign in order to restore lost productivity. The objective of this paper is to detail the whole operation journey of the fill cleanout jobs that includes fill diagnostic process, assessment of cleanout methods, initial job design, choice of fluids, CT Bottomhole Assembly tools, execution and field experience, and post-cleanout performance evaluation. A CT wiper trip method has been implemented with either milling or jetting tools. A newly developed rate-activated circulation valve is deployed to aid in lifting solids at high pumping rates as well as jetting acid across the screen interval after fill removal. The fill cleanout campaign has been very successful in restoring well productivity as compared to pre-cleanout and initial post-drilling well performance. A total of 340 MMSCFD of incremental gas rate were restored to-date from 16 cleanout operations. Unprecedentedly, interesting and valuable findings are shared regarding the nature of fill formed inside and/or above the stand alone screens, recommended milling practices to protect CT Bottomhole Assembly and minimize CT fatigue, the experience of incorporating acid jetting and squeeze in the CT wiper trip method to stimulate damaged formation pack behind the screens, and the preventive measures taken to cope with the fill accumulation issue.