The Experts below are selected from a list of 15696 Experts worldwide ranked by ideXlab platform
Ephraim M Sparrow - One of the best experts on this subject based on the ideXlab platform.
-
a novel comprehensive numerical simulation for predicting temperatures within boreholes and the adjoining rock bed
Geothermics, 2014Co-Authors: John M Gorman, John Abraham, Ephraim M SparrowAbstract:Abstract Borehole creation involve complex thermal phenomena such as the injection of a fluid to cool the cutting tool and carry debris to the surface, generation of heat caused by the cutting tool, and the thermal interactions between the flowing fluid and the stationary rock. These phenomena alter the temperature of the rock from its undisturbed state. An accurate characterization of the temperatures within the rock prior to the Drilling Operation is necessary for resource extraction, geothermal heat conduction calculations, and for paleoclimate studies. Disturbances in the rock temperature can lead to uncertainties in these calculated quantities and in the application of the inverse method. Presently, methods are available which treat the flowing fluid in a simplified manner, often as a stationary medium, and allow estimation of the temperature disturbances in the rock wall. Nevertheless, to the best knowledge of the authors, there are no published studies which fully include the fluid flow in the borehole during the Drilling Operation and its direct impact on temperatures. Additionally, the impact of the heat generation at the drill head on the temperatures in the fluid and the surrounding rock have not fully been studied. A method is proposed for determining temperatures within boreholes and the surrounding rock both during and after the Drilling Operation. The method encompasses all the issues listed above. It was discovered that the coolant temperature is dependent upon location within the borehole, and the relaxation time of rock temperatures to their equilibrium values varies with depth in the borehole.
A.m. Agogino - One of the best experts on this subject based on the ideXlab platform.
-
Real time expert system for predictive diagnostics and control of Drilling Operation
Sixth Conference on Artificial Intelligence for Applications, 1990Co-Authors: K. Ramamurthi, D.p. Shaver, A.m. AgoginoAbstract:The suitability and applicability of a real-time expert system for integrating multiple sensors for predictive diagnostics, monitoring, and supervisory control of a Drilling Operation in an automated manufacturing environment were investigated. The real-time IDES (influence diagram based expert system) performs probabilistic inference and expected-value decision-making in integrating dynamic but noisy sensory data and subjective expertise in symbolic and numerical data structures designed for real-time performance. An application using spindle motor current, feed motor current, and spindle-mounted strain-gauge sensors on a numerically controlled Drilling machine is described. In this example, with relatively simple signal processing, IDES achieves effective prediction about the state of the drill and optimally controls the performance of the Drilling machine. The real-time expert system performance is demonstrated over a wide range of machining conditions: two workpiece materials, two drill sizes, six speeds, and seven feed rates. With an MS-DOS personal computer, the system was able to predict tool failure in 1.7 to 2.1 ms, well within the desired response time of an industrial production line Operation.
B. Misra - One of the best experts on this subject based on the ideXlab platform.
-
Laboratory investigations on rotary diamond Drilling
Geotechnical & Geological Engineering, 2002Co-Authors: A. Bhatnagar, B. MisraAbstract:Extensive laboratory Drilling investigations were conducted on a wide variety of rocks to study the inter-dependence of machine as well as rock parameters on the performance of the Drilling Operation. Detailed physical and mechanical properties of all the rock types were determined to study the influence of the rock properties on the Drilling performance. The effect of PEO (poly-ethylene-oxide) added to the Drilling water was also studied. Slake durability tests were conducted in plain water as well as a PEO mixed water medium to observe the effects of PEO on the surface properties of the rock. An attempt is also made to understand the different modes of wear of impregnated diamond bits in the rotary Drilling Operation.
Vahid Azizi - One of the best experts on this subject based on the ideXlab platform.
-
real time optimization of rate of penetration during Drilling Operation
International Conference on Control and Automation, 2013Co-Authors: Roar Nybo, Vahid AziziAbstract:The increase of Drilling safety and the reduction of Drilling Operation costs, especially the improvement of Drilling efficiency, are two important considerations. In general the rate of penetration (ROP) optimization means that the Drilling parameters such as weight on bit (WOB) and rotary speed (RPM) are adjusted to drill the present formation most efficiently. In this paper, the Bourgoyne and Young ROP model had been selected to study the effects of several parameters during Drilling Operation. We present an advanced method for the ROP calculation and its optimization. A moving-horizon multiple regression method is proposed, which reduces the estimation error of the existing ROP models by continuously calibrating the model coefficients based on real-time data. Furthermore, a model predictive control (MPC) strategy is applied to achieve the ROP optimization to satisfy Drilling requirements. The performance of the methodology is demonstrated by using realworld data from a North Sea well.
-
ICCA - Real-time optimization of rate of penetration during Drilling Operation
2013 10th IEEE International Conference on Control and Automation (ICCA), 2013Co-Authors: Roar Nybo, Vahid AziziAbstract:The increase of Drilling safety and the reduction of Drilling Operation costs, especially the improvement of Drilling efficiency, are two important considerations. In general the rate of penetration (ROP) optimization means that the Drilling parameters such as weight on bit (WOB) and rotary speed (RPM) are adjusted to drill the present formation most efficiently. In this paper, the Bourgoyne and Young ROP model had been selected to study the effects of several parameters during Drilling Operation. We present an advanced method for the ROP calculation and its optimization. A moving-horizon multiple regression method is proposed, which reduces the estimation error of the existing ROP models by continuously calibrating the model coefficients based on real-time data. Furthermore, a model predictive control (MPC) strategy is applied to achieve the ROP optimization to satisfy Drilling requirements. The performance of the methodology is demonstrated by using realworld data from a North Sea well.
John M Gorman - One of the best experts on this subject based on the ideXlab platform.
-
a novel comprehensive numerical simulation for predicting temperatures within boreholes and the adjoining rock bed
Geothermics, 2014Co-Authors: John M Gorman, John Abraham, Ephraim M SparrowAbstract:Abstract Borehole creation involve complex thermal phenomena such as the injection of a fluid to cool the cutting tool and carry debris to the surface, generation of heat caused by the cutting tool, and the thermal interactions between the flowing fluid and the stationary rock. These phenomena alter the temperature of the rock from its undisturbed state. An accurate characterization of the temperatures within the rock prior to the Drilling Operation is necessary for resource extraction, geothermal heat conduction calculations, and for paleoclimate studies. Disturbances in the rock temperature can lead to uncertainties in these calculated quantities and in the application of the inverse method. Presently, methods are available which treat the flowing fluid in a simplified manner, often as a stationary medium, and allow estimation of the temperature disturbances in the rock wall. Nevertheless, to the best knowledge of the authors, there are no published studies which fully include the fluid flow in the borehole during the Drilling Operation and its direct impact on temperatures. Additionally, the impact of the heat generation at the drill head on the temperatures in the fluid and the surrounding rock have not fully been studied. A method is proposed for determining temperatures within boreholes and the surrounding rock both during and after the Drilling Operation. The method encompasses all the issues listed above. It was discovered that the coolant temperature is dependent upon location within the borehole, and the relaxation time of rock temperatures to their equilibrium values varies with depth in the borehole.
