The Experts below are selected from a list of 1062 Experts worldwide ranked by ideXlab platform
Peng Yong - One of the best experts on this subject based on the ideXlab platform.
-
Research on Circuit and Control System of an Environment-Friendly Equipment Applied to Hot-Phosphating of the Drill Collar Coupling Screw Thread
2010 International Conference on Measuring Technology and Mechatronics Automation, 2010Co-Authors: Duan Zhengyong, Peng Yong, Wenhui YanAbstract:Research on circuit and control system of an environment-friendly equipment applied to hot-phosphating of the Drill Collar coupling screw thread has been carried out. In terms of the hot-phosphating processing, the functions and requirements of the control system of the equipment were established, which are the essential aim that we design the system. Accordingly, the designs and calculations to the key parts of the circuit and control system have been accomplished. Using PLC, achieved the controlling of the circuit and control system. The whole installation is total-closed and its structure is simple and compact. So this equipment has some important merits such as easy operation and maintenance, low cost of manufacturing and running, high utilization rate and easy maintenance of the phosphating solution. In addition, only to reprogram the LAD program of the PLC can be to meet the changes of the hot-phosphating processing which has good adaptability.
-
Research on an Environment-Friendly Automated Equipment Applied to Hot-Phosphating for Drill Collar Coupling Screw Thread
2009 Second International Symposium on Information Science and Engineering, 2009Co-Authors: Zhang Limin, Duan Zhengyong, Peng YongAbstract:Based on the present situations and requirements of the hot-phosphating for the oil Drill Collar coupling screw thread, one type of environment-friendly automated equipment has been studied, the corresponding hot-phosphating process has been consummated and one new implementation scheme has been designed in which some key technologies such as total-closed circuit and autocontrol have been accomplished. Comparing with the open-type phosphating trough instrument, this equipment has total-closed structure in which all function solutions such as degreasing and descaling, surface conditioning, phosphating, passivation and cleaning can circulate continuously which means phosphating solution is easy to maintain and there is no pollution to it and its service life is prolonged accordingly, all that avoid the glaring drawbacks in open-style one. In addition, this device has low processing and operating cost, efficiency is high and the quality of the phosphating coat is reliable. Specially, there is no harm to environment and operators. And the control system is based on PLC which is applied usually in industrial control, it is easy to build and has reliable performance. The whole installation needs a low capital investment relatively and is operated and maintained simply and conveniently which implies a widespread application in Drill Collar coupling screw thread hot-phosphating.
Xiaoming Tang - One of the best experts on this subject based on the ideXlab platform.
-
mapping formation shear velocity variation by inverting logging while Drilling quadrupole wave dispersion data
Geophysics, 2013Co-Authors: Yuanda Su, Chunxi Zhuang, Song Xu, Xiaoming Tang, Long ZhaoAbstract:ABSTRACTThe logging-while-Drilling (LWD) quadrupole wave is a dispersive wave mode guided along the borehole with a Drill Collar. The wave is sensitive to the formation alteration caused by Drilling. We inverted LWD quadrupole-wave dispersion data to estimate a radial shear-velocity profile away from the wellbore. We also explored the nonuniqueness of the inverse problem and solved it by using a constrained inversion method. This was done by constraining the high-frequency portion of the model dispersion curve with another curve calculated using the near-borehole velocity. The constraint condition is based on the physical principle that a high-frequency LWD quadrupole wave has a shallow penetration depth and is therefore sensitive to the near-borehole shear velocity. Particularly, we found that a monotonically continuous velocity profile can be well approximated using a one-zone equivalent model, allowing for a drastic simplification of the inversion process. We used theoretical modeling and real data exa...
-
a logging while Drilling acoustic isolation technology by varying thickness of Drill Collars at a distance greater than wavelength
Journal of the Acoustical Society of America, 2012Co-Authors: Yuanda Su, Xiaoming TangAbstract:A key technology for logging while Drilling (LWD) acoustic measurements is the design of an acoustic isolator to suppress tool waves propagating along the Drill Collar, such that acoustic signals from earth formations can be effectively measured under LWD conditions. Up to now, the LWD acoustic isolation is achieved by periodically cutting grooves along the Drill Collar between acoustic transmitter and receivers. Such a technique, although it is effective, reduces the mechanical strength of the Drill Collar and adds cost to the manufacturing and maintenance of the LWD tool, hindering the application of the LWD acoustic technology. We have developed an LWD acoustic technology that does not use the groove-cutting design. We utilize the inherent frequency stopband for extensional wave propagation along a cylindrical pipe and effectively broaden the stopband by combining Drill pipes of different cross-section areas whose lengths are greater than a wavelength but are shorter than the transmitter-to-receiver distance. After propagation through the combined Drill Collar system, the stopband in the Collar extensional wave is significantly widened and the wave amplitude in the stopband is substantially reduced. Making LWD acoustic measurements in this widened stopband allows for recording acoustic signals from the surrounding formation.
-
a logging while Drilling acoustic isolation technology by varying thickness of Drill Collars at a distance greater than wavelength
Journal of the Acoustical Society of America, 2012Co-Authors: Yuanda Su, Xiaoming TangAbstract:A key technology for logging while Drilling (LWD) acoustic measurements is the design of an acoustic isolator to suppress tool waves propagating along the Drill Collar, such that acoustic signals from earth formations can be effectively measured under LWD conditions. Up to now, the LWD acoustic isolation is achieved by periodically cutting grooves along the Drill Collar between acoustic transmitter and receivers. Such a technique, although it is effective, reduces the mechanical strength of the Drill Collar and adds cost to the manufacturing and maintenance of the LWD tool, hindering the application of the LWD acoustic technology. We have developed an LWD acoustic technology that does not use the groove-cutting design. We utilize the inherent frequency stopband for extensional wave propagation along a cylindrical pipe and effectively broaden the stopband by combining Drill pipes of different cross-section areas whose lengths are greater than a wavelength but are shorter than the transmitter-to-receiver di...
-
multipole acoustic logging while Drilling
Seg Technical Program Expanded Abstracts, 2002Co-Authors: Xiaoming Tang, Tsili Wang, Doug PattersonAbstract:The problem of multipole acoustic Logging-WhileDrilling (LWD) is analyzed. By formulating a multipole acoustic ring source at the rim of the Drill Collar, we model the characteristics of monopole, dipole, and quadrupole waves in the LWD environment. In particular, we analyze the feasibility of shear-wave velocity measurement using the dipole and quadrupole waves. The results show that the dipole-flexural wave, although it can attain the shear velocity in a fast formation, lags significantly behind the expected shear-wave arrival time in a slow formation. In addition, there is a strong contamination caused by the tool flexural wave traveling along the Collar. In comparison, the quadrupole wave is most suited for the shear-velocity measurement. At low frequencies, the quadrupole wave travels at the formation shear velocity and is free of the tool-wave interference.
Duan Zhengyong - One of the best experts on this subject based on the ideXlab platform.
-
Research on Circuit and Control System of an Environment-Friendly Equipment Applied to Hot-Phosphating of the Drill Collar Coupling Screw Thread
2010 International Conference on Measuring Technology and Mechatronics Automation, 2010Co-Authors: Duan Zhengyong, Peng Yong, Wenhui YanAbstract:Research on circuit and control system of an environment-friendly equipment applied to hot-phosphating of the Drill Collar coupling screw thread has been carried out. In terms of the hot-phosphating processing, the functions and requirements of the control system of the equipment were established, which are the essential aim that we design the system. Accordingly, the designs and calculations to the key parts of the circuit and control system have been accomplished. Using PLC, achieved the controlling of the circuit and control system. The whole installation is total-closed and its structure is simple and compact. So this equipment has some important merits such as easy operation and maintenance, low cost of manufacturing and running, high utilization rate and easy maintenance of the phosphating solution. In addition, only to reprogram the LAD program of the PLC can be to meet the changes of the hot-phosphating processing which has good adaptability.
-
Research on an Environment-Friendly Automated Equipment Applied to Hot-Phosphating for Drill Collar Coupling Screw Thread
2009 Second International Symposium on Information Science and Engineering, 2009Co-Authors: Zhang Limin, Duan Zhengyong, Peng YongAbstract:Based on the present situations and requirements of the hot-phosphating for the oil Drill Collar coupling screw thread, one type of environment-friendly automated equipment has been studied, the corresponding hot-phosphating process has been consummated and one new implementation scheme has been designed in which some key technologies such as total-closed circuit and autocontrol have been accomplished. Comparing with the open-type phosphating trough instrument, this equipment has total-closed structure in which all function solutions such as degreasing and descaling, surface conditioning, phosphating, passivation and cleaning can circulate continuously which means phosphating solution is easy to maintain and there is no pollution to it and its service life is prolonged accordingly, all that avoid the glaring drawbacks in open-style one. In addition, this device has low processing and operating cost, efficiency is high and the quality of the phosphating coat is reliable. Specially, there is no harm to environment and operators. And the control system is based on PLC which is applied usually in industrial control, it is easy to build and has reliable performance. The whole installation needs a low capital investment relatively and is operated and maintained simply and conveniently which implies a widespread application in Drill Collar coupling screw thread hot-phosphating.
C.a. Dupuy - One of the best experts on this subject based on the ideXlab platform.
-
Effect of Downhole Assembly and Polycrystalline Diamond Compact (PDC) Bit Geometry on Stability of Drillstrings
Journal of Energy Resources Technology-transactions of The Asme, 1997Co-Authors: M. A. Elsayed, D.w. Dareing, C.a. DupuyAbstract:Stability of Drillstrings equipped with PDC bits depends on many factors such as the design of the Drillstring, design of the bit, and formation type. In this paper, we show that the Drill pipe plays a minor role in stability in comparison with that of the Drill Collars. We also show that the number of bit blades affects the location of the stability pockets, while their spacing affects the size of these pockets. Using this data, a combination of Drill Collar and bit design can be used to provide operating speeds resulting in maximum stability of the Drillstring.
-
Effect of downhole assembly and cutter geometry on stability of Drillstrings equipped with polycrystalline diamond compact (PDC) cutters
1996Co-Authors: Elsayed, D.w. Dareing, C.a. DupuyAbstract:Stability of Drillstrings equipped with PDC cutters depends on many factors such as the design of the Drillstring, design of the cutter, and formation type. In this paper, the authors show that the Drill pipe plays a minor role in stability in comparison with that of the Drill Collars. They also show that the number of cutter blades affects the location of the stability pockets, while their spacing affects the size of these pockets. Using this data, a combination of Drill Collar and cutter design can be used to provide operating speeds resulting in maximum stability of the Drillstring.
Hua Wang - One of the best experts on this subject based on the ideXlab platform.
-
stability of finite difference numerical simulations of acoustic logging while Drilling with different perfectly matched layer schemes
Applied Geophysics, 2013Co-Authors: Xuefeng Shang, Xinding Fang, Hua Wang, Daniel R BurnsAbstract:In acoustic logging-while-Drilling (ALWD) finite difference in time domain (FDTD) simulations, large Drill Collar occupies, most of the fluid-filled borehole and divides the borehole fluid into two thin fluid columns (radius ∼27 mm). Fine grids and large computational models are required to model the thin fluid region between the tool and the formation. As a result, small time step and more iterations are needed, which increases the cumulative numerical error. Furthermore, due to high impedance contrast between the Drill Collar and fluid in the borehole (the difference is >30 times), the stability and efficiency of the perfectly matched layer (PML) scheme is critical to simulate complicated wave modes accurately. In this paper, we compared four different PML implementations in a staggered grid finite difference in time domain (FDTD) in the ALWD simulation, including field-splitting PML (SPML), multiaxial PML(MPML), non-splitting PML (NPML), and complex frequency-shifted PML (CFS-PML). The comparison indicated that NPML and CFS-PML can absorb the guided wave reflection from the computational boundaries more efficiently than SPML and M-PML. For large simulation time, SPML, M-PML, and NPML are numerically unstable. However, the stability of M-PML can be improved further to some extent. Based on the analysis, we proposed that the CFS-PML method is used in FDTD to eliminate the numerical instability and to improve the efficiency of absorption in the PML layers for LWD modeling. The optimal values of CFS-PML parameters in the LWD simulation were investigated based on thousands of 3D simulations. For typical LWD cases, the best maximum value of the quadratic damping profile was obtained using one d 0. The optimal parameter space for the maximum value of the linear frequency-shifted factor (α 0) and the scaling factor (β 0) depended on the thickness of the PML layer. For typical formations, if the PML thickness is 10 grid points, the global error can be reduced to <1% using the optimal PML parameters, and the error will decrease as the PML thickness increases.
