The Experts below are selected from a list of 294 Experts worldwide ranked by ideXlab platform
Kerwin Rittammer - One of the best experts on this subject based on the ideXlab platform.
-
Preventing Centrifuge Failures Due to Voltage Distortion on a Drilling Rig
IEEE Transactions on Industry Applications, 2016Co-Authors: A. H. Hoevenaars, Michael Mcgraw, Kerwin RittammerAbstract:The ac and dc drives commonly used on land and offshore drilling rigs produce extremely high levels of harmonic distortion. With voltage distortion often exceeding 20%, equipment associated with the drilling operation can experience erratic operation and equipment damage. Repeated damage to one or several ac drives is common. One land rig in Northern Alberta was experiencing failures with its centrifuge equipment on a weekly basis. During one visit to the site, a drive in the centrifuge was found to have tripped off causing the centrifuge to plug up. After cleaning out the centrifuge and restoring the drive, it tripped off again shortly after drilling operations resumed. A power quality analyzer was connected, which revealed extremely high levels of voltage distortion during drilling operations. Deep notches, which are visible in the voltage waveform, were found to be the result of silicon-controlled rectifiers in the Mud Pump dc drives. Total harmonic voltage distortion (VTHD) reached 25%. A series-connected passive filter was installed ahead of the centrifuge equipment to reduce the voltage notching and lower voltage distortion. The filter reduced the notch depth by more than half and lowered overall voltage distortion at the centrifuge panel to <; 9% during the most severe drilling operations. With line-side voltage distortion levels remaining in the 20% range, the filter proved to be extremely effective in eliminating all centrifuge operational and premature failure issues.
-
Preventing Centrifuge Failures Due to Voltage Distortion on a Drilling Rig
IEEE Transactions on Industry Applications, 2016Co-Authors: A. H. Hoevenaars, Michael Mcgraw, Kerwin RittammerAbstract:The ac and dc drives commonly used on land and offshore drilling rigs produce extremely high levels of harmonic distortion. With voltage distortion often exceeding 20%, equipment associated with the drilling operation can experience erratic operation and equipment damage. Repeated damage to one or several ac drives is common. One land rig in Northern Alberta was experiencing failures with its centrifuge equipment on a weekly basis. During one visit to the site, a drive in the centrifuge was found to have tripped off causing the centrifuge to plug up. After cleaning out the centrifuge and restoring the drive, it tripped off again shortly after drilling operations resumed. A power quality analyzer was connected, which revealed extremely high levels of voltage distortion during drilling operations. Deep notches, which are visible in the voltage waveform, were found to be the result of silicon-controlled rectifiers in the Mud Pump dc drives. Total harmonic voltage distortion (VTHD) reached 25%. A series-connected passive filter was installed ahead of the centrifuge equipment to reduce the voltage notching and lower voltage distortion. The filter reduced the notch depth by more than half and lowered overall voltage distortion at the centrifuge panel to
-
Preventing centrifuge failures due to voltage distortion on a Drilling Rig
2014 IEEE Petroleum and Chemical Industry Technical Conference (PCIC), 2014Co-Authors: A. H. Hoevenaars, Michael Mcgraw, Kerwin RittammerAbstract:AC and DC Drives commonly used on land and offshore Drilling Rigs produce extremely high levels of harmonic distortion. With voltage distortion often exceeding 20%, equipment associated with the drilling operation can experience erratic operation and equipment damage. Repeated damage to one or several AC Drives is common. One land Rig in Northern Alberta was experiencing failures with its centrifuge equipment on a weekly basis. During one visit to the site, a Drive in the centrifuge was found to have tripped off causing the centrifuge to plug up. After cleaning out the centrifuge and restoring the Drive, it tripped off again shortly after drilling operations resumed. A Power Quality Analyzer was connected which revealed extremely high levels of voltage distortion during drilling operations. Deep notches, visible in the voltage waveform, were found to be the result of SCR's in the Mud Pump DC Drives. Total harmonic voltage distortion (VTHD) reached 25%. A series connected passive filter was installed ahead of the centrifuge equipment to reduce the voltage notching and lower voltage distortion. The filter reduced notch depth by more than half and lowered overall voltage distortion at the centrifuge panel to
Qian Cong - One of the best experts on this subject based on the ideXlab platform.
-
sealing performance of bionic striped Mud Pump piston
Advances in Materials Science and Engineering, 2019Co-Authors: Qian Cong, Weijun TianAbstract:The Mud Pump piston is a key part for providing Mud circulation, but its sealing performance often fails under complex working conditions, which shorten its service life. Inspired by the ring segment structure of earthworms, the bionic striped structure on surfaces of the Mud Pump piston (BW-160) was designed and machined, and the sealing performances of the bionic striped piston and the standard piston were tested on a sealing performance testing bench. It was found the bionic striped structure efficiently enhanced the sealing performance of the Mud Pump piston, while the stripe depth and the angle between the stripes and lateral of the piston both significantly affected the sealing performance. The structure with a stripe depth of 2 mm and angle of 90° showed the best sealing performance, which was 90.79% higher than the standard piston. The sealing mechanism showed the striped structure increased the breadth and area of contact sealing between the piston and the cylinder liner. Meanwhile, the striped structure significantly intercepted the early leaked liquid and led to the refluxing rotation of the leaked liquid at the striped structure, reducing the leakage rate.
-
wear performance of bionic dimpled shape pistons of Mud Pump
Advances in Materials Science and Engineering, 2017Co-Authors: Xuejing Cheng, Shaofeng Ru, Qian CongAbstract:The piston is one of the parts that most easily become worn out and experience failure in Mud Pumps for well drilling. By imitating the body surface morphology of the dung beetle, this paper proposed a new type (BW-160) of Mud Pump piston that had a dimpled shape in the regular layout on the piston leather cup surface and carried out a performance test on the self-built test rig. Firstly, the influence of different dimple diameters on the service life of the piston was analyzed. Secondly, the analysis of the influence of the dimple central included angle on the service life of the piston under the same dimple area density was obtained. Thirdly, the wear of the new type of piston under the same wear time was analyzed. The experimental results indicated that the service life of the piston with dimples on the surface was longer than that of L-Standard pistons, and the maximum increase in the value of service life was 92.06%. Finally, the Workbench module of the software ANSYS was used to discuss the wear-resisting mechanism of the new type of piston.
-
wear performance of bionic strip shaped Mud Pump pistons
Proceedings of the Institution of Mechanical Engineers Part C: Journal of Mechanical Engineering Science, 2017Co-Authors: X J Cheng, S F Ru, Qian CongAbstract:The service life of Mud Pump pistons may be extended by imitating the body surface morphology of earthworms. To achieve this solution, bionic strip structures of various sizes are processed on the working surface of a BW-160 Mud Pump piston. The service lives of standard and bionic pistons are compared under experimental conditions. Results show that the bionic strip structure clearly improves the service life of Mud Pump pistons. The influence of the width of a bionic piston strip is greater than that of strip spacing. The bionic strip should not be too small or large because size could have negligible or deleterious effects on service life, respectively. The optimal structure parameters of a bionic strip piston when the optimal contact area between the piston and the cylinder liner is 73.5% are a strip width of 3 mm, strip spacing of 3 mm, and strip number of 3. These parameters improve piston service life by 81.5%. Finite element analysis simulations of wear demonstrate that the bionic strip can change...
Joseph Zhou - One of the best experts on this subject based on the ideXlab platform.
-
System Harmonic Interaction Between DC and AC Adjustable Speed Drives and Cost Effective Mitigation
IEEE Transactions on Industry Applications, 2016Co-Authors: D.j. Carnovale, Douglas Young, Darrell Ouellette, Joseph ZhouAbstract:In industrial applications where both dc and ac adjustable speed drives (ASDs) are used, high levels of harmonic voltage and current distortions are produced. For instance, in the oil and gas industry, including land and offshore drilling rigs and ships, deep notches in the voltage waveform exist due to silicon-controlled rectifier or thyristor (SCR's) operation in the Mud Pump dc drives. With voltage distortion often exceeding 20%, equipment associated with the drilling operation can experience erratic operation and equipment damage. Even though the notch phenomenon is well understood, the failure mode of ac ASDs has not been analyzed in published literatures. This paper provides the background of the typical power distribution installation in such an application, and analyzes the voltage notches in ac/dc converters and the problems that they create; more significantly, presents the ac ASD components failure mechanisms and proposes a cost effective solution without introducing expensive harmonic filters. The theoretical foundation and analytical derivation that are used to calculate notch depth, width, and frequency resonance excitation interacting with ac ASD's electromagnetic interference filter will be discussed. Variation factors influencing the harmonic characteristics including SCR firing angle, generator, and cable impedance, ASD's input ac inductors or dc chokes are quantitatively evaluated. It will be demonstrated that ASDs with dc chokes are less sensitive to cause resonances through system harmonics interaction, possibly eliminating the need to install expensive and large passive filters. Theoretical and simulation models are validated through an experimental setup of a 15 kW 480-V ASD system.
-
System harmonic interaction between DC and AC adjustable speed drives and cost effective mitigation
2015 IEEE Energy Conversion Congress and Exposition (ECCE), 2015Co-Authors: Kevin Lee, Douglas Young, D.j. Carnovale, Joseph ZhouAbstract:In industrial applications where both DC (direct current) and AC (alternating current) adjustable speed drives (ASD) are used, high levels of harmonic voltage and current distortions are produced. For instance, in oil and gas industry, including land and offshore drilling rigs, ships, deep notches in the voltage waveform exist due to SCR's (silicon controlled rectifier or thyristor) operation in the Mud Pump DC drives. With voltage distortion often exceeding 20%, equipment associated with the drilling operation can experience erratic operation and equipment damage. Even though the notch phenomenon is well understood, the failure mode of AC ASDs has not been analyzed in published literatures. This paper provides the background of the typical power distribution installation in such an application, analyzes the voltage notches in AC/DC converters and the problems that they create, more significantly, presents the AC ASD components failure mechanisms and proposes a cost effective solution without introducing expensive harmonic filters. The theoretical foundation and analytical derivation that are used to calculate notch depth, width, and frequency resonance excitation interacting with AC ASD's electromagnetic interference (EMI) filter will be discussed. Variation factors influencing the harmonic characteristics including SCR firing angle, generator and cable impedance, ASD's input AC inductors or DC chokes are quantitatively evaluated. It will be demonstrated that ASDs with DC chokes are less sensitive to cause resonances through system harmonics interaction, possibly eliminating the need to install expensive and large passive filters. Theoretical and simulation models are validated through an experimental setup of a 15kW, 480V ASD system.
A. H. Hoevenaars - One of the best experts on this subject based on the ideXlab platform.
-
Preventing Centrifuge Failures Due to Voltage Distortion on a Drilling Rig
IEEE Transactions on Industry Applications, 2016Co-Authors: A. H. Hoevenaars, Michael Mcgraw, Kerwin RittammerAbstract:The ac and dc drives commonly used on land and offshore drilling rigs produce extremely high levels of harmonic distortion. With voltage distortion often exceeding 20%, equipment associated with the drilling operation can experience erratic operation and equipment damage. Repeated damage to one or several ac drives is common. One land rig in Northern Alberta was experiencing failures with its centrifuge equipment on a weekly basis. During one visit to the site, a drive in the centrifuge was found to have tripped off causing the centrifuge to plug up. After cleaning out the centrifuge and restoring the drive, it tripped off again shortly after drilling operations resumed. A power quality analyzer was connected, which revealed extremely high levels of voltage distortion during drilling operations. Deep notches, which are visible in the voltage waveform, were found to be the result of silicon-controlled rectifiers in the Mud Pump dc drives. Total harmonic voltage distortion (VTHD) reached 25%. A series-connected passive filter was installed ahead of the centrifuge equipment to reduce the voltage notching and lower voltage distortion. The filter reduced the notch depth by more than half and lowered overall voltage distortion at the centrifuge panel to <; 9% during the most severe drilling operations. With line-side voltage distortion levels remaining in the 20% range, the filter proved to be extremely effective in eliminating all centrifuge operational and premature failure issues.
-
Preventing Centrifuge Failures Due to Voltage Distortion on a Drilling Rig
IEEE Transactions on Industry Applications, 2016Co-Authors: A. H. Hoevenaars, Michael Mcgraw, Kerwin RittammerAbstract:The ac and dc drives commonly used on land and offshore drilling rigs produce extremely high levels of harmonic distortion. With voltage distortion often exceeding 20%, equipment associated with the drilling operation can experience erratic operation and equipment damage. Repeated damage to one or several ac drives is common. One land rig in Northern Alberta was experiencing failures with its centrifuge equipment on a weekly basis. During one visit to the site, a drive in the centrifuge was found to have tripped off causing the centrifuge to plug up. After cleaning out the centrifuge and restoring the drive, it tripped off again shortly after drilling operations resumed. A power quality analyzer was connected, which revealed extremely high levels of voltage distortion during drilling operations. Deep notches, which are visible in the voltage waveform, were found to be the result of silicon-controlled rectifiers in the Mud Pump dc drives. Total harmonic voltage distortion (VTHD) reached 25%. A series-connected passive filter was installed ahead of the centrifuge equipment to reduce the voltage notching and lower voltage distortion. The filter reduced the notch depth by more than half and lowered overall voltage distortion at the centrifuge panel to
-
Preventing centrifuge failures due to voltage distortion on a Drilling Rig
2014 IEEE Petroleum and Chemical Industry Technical Conference (PCIC), 2014Co-Authors: A. H. Hoevenaars, Michael Mcgraw, Kerwin RittammerAbstract:AC and DC Drives commonly used on land and offshore Drilling Rigs produce extremely high levels of harmonic distortion. With voltage distortion often exceeding 20%, equipment associated with the drilling operation can experience erratic operation and equipment damage. Repeated damage to one or several AC Drives is common. One land Rig in Northern Alberta was experiencing failures with its centrifuge equipment on a weekly basis. During one visit to the site, a Drive in the centrifuge was found to have tripped off causing the centrifuge to plug up. After cleaning out the centrifuge and restoring the Drive, it tripped off again shortly after drilling operations resumed. A Power Quality Analyzer was connected which revealed extremely high levels of voltage distortion during drilling operations. Deep notches, visible in the voltage waveform, were found to be the result of SCR's in the Mud Pump DC Drives. Total harmonic voltage distortion (VTHD) reached 25%. A series connected passive filter was installed ahead of the centrifuge equipment to reduce the voltage notching and lower voltage distortion. The filter reduced notch depth by more than half and lowered overall voltage distortion at the centrifuge panel to
Tomasz Piasecki - One of the best experts on this subject based on the ideXlab platform.
-
The Use of Acoustic Emission Elastic Waves for Diagnosing High Pressure Mud Pumps Used on Drilling Rigs
Energies, 2020Co-Authors: A. Bejger, Tomasz PiaseckiAbstract:Although Mud Pumps are vital components of a drilling rig, their failures are frequent. The identification of technical condition of these high-pressure piston Pumps is difficult. There are no reliable criteria for the assessment of Mud Pump condition. In this paper, faults of the Pump valve module are identified by means of acoustic emission (AE) signals. The characteristics of these signals are extracted by wavelet packet signal processing. This method has been verified by experiments conducted on a NOV (National Oilwell Varco) -made triplex 14-P-220 Mud Pump (mounted in the drillship). The results show that the wavelet packet signal processing method can effectively extract the frequency band energy eigenvalues of the signals. Besides, some operational problems associated with high pressure piston Mud Pumps are presented. A non-invasive method for diagnosing the technical condition of such Pumps is being developed at the Maritime University of Szczecin.
-
technical problems of Mud Pumps on ultra deepwater drilling rigs
Zeszyty Naukowe Akademia Morska w Szczecinie, 2013Co-Authors: A. Bejger, Tomasz PiaseckiAbstract:The article presents selected technical issues relating to drilling performed by a drillship, one type of drilling rigs. Basic problems encountered in the main function of such rigs − drilling a well − are failures of Mud Pumps. The authors investigate these Pumps in operational conditions, aiming at development of a system for monitoring the technical condition of these Pumps. Work on a diagnostic system is in progress that will permit to predict the condition of Mud Pump valves well in advance.