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- W2089688762 abstract "Abstract Downhole measurement systems have reached an impressive level of accuracy and reliability. However, the predictive behavior aspect of complete drilling systems, whether it be vibrational or directional, until recently has not received the same focus. The two key components affecting the overall dynamics of a drilling system are the effect of the cutting structures of drilling tools (drill bits, underreamers, etc.) and the behavior of the BHA and drill string. Typically, these aspects have been modeled in isolation, or rudimentary assumptions are made to approximate the effect one on the other. To more accurately predict the performance of the drilling system, it is essential to consider the sum of all forces affecting the system. This must include accurate modeling of the drill bit cutting structure, based on actual bit design, rock properties and drilling parameters. The effect of these forces must be coupled with the forces generated by the BHA and drilling string, and the interaction of these forces should be modeled and understood. These issues have significant cost implications for the operator but in both cases are complex to model. A system approach is required to achieve true optimization of these two historically separate areas of drillstring design. Typically, drillstring analysis programs currently available to the industry are run on personal computers with limited random access memory capabilities and are, therefore, restricted to modelling only the BHA portion of the drillstring. For the same reason, bit effect factors that significantly influence drillstring behavior are at best assumed. Utilizing a suite of Finite Element Analysis (FEA) based programs running on a Unix platform; four-dimensional, time-based simulations of the complete drilling process are now possible. The exact interaction between the bit and the formation drilled are modelled using lab-derived rock mechanics. The bit and every string component are modelled individually. The system generates the behavior of the entire drillstring, from the cutting edge of the bit to surface. The modelling accurately predicts the vibrations and accelerations often seen to have detrimental effects on directional control, tool reliability, drill string integrity and drilling performance. The ability to pinpoint the source and effects of torsional, axial and lateral oscillations enables users to qualify design changes to the drillstring configuration and optimize parameters, prior to drilling the well, that eliminate the traditional trial and error approach and reduce operator risk." @default.
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- W2089688762 date "2006-02-21" @default.
- W2089688762 modified "2023-09-27" @default.
- W2089688762 title "Integrated FEA Modeling Offers System Approach to Drillstring Optimization" @default.
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