The Experts below are selected from a list of 7503 Experts worldwide ranked by ideXlab platform
Carlos Torresverdin - One of the best experts on this subject based on the ideXlab platform.
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numerical simulation of borehole acoustic Logging in the frequency and time domains with hp adaptive finite elements
Computer Methods in Applied Mechanics and Engineering, 2009Co-Authors: Christian Michler, Leszek Demkowicz, Carlos TorresverdinAbstract:Accurate numerical simulation of borehole acoustic measurements is of great relevance to improving the efficacy of acoustic Logging techniques and to computationally estimating elastic formation properties. Such simulations require sound physical modeling combined with accurate and efficient numerical discretization and solution techniques. The objective of this paper is to concomitantly model acoustic wave propagation in a fluid-filled borehole coupled with elastic wave propagation both in the probed rock formation and in the elastic Logging Tool. To ensure the accuracy and efficiency of our simulations, we use a self-adaptive finite-element discretization method enhanced with Perfectly-Matched-Layer spatial-domain truncation. This work constitutes the first application of automatic hp-adaptivity to a coupled multi-physics problem, which requires the non-trivial capability of propagating refinements between acoustics and elasticity subdomains through their common interface. Computations are carried out in the frequency domain. Subsequently, using an inverse Fourier transform, frequency-domain solutions are transformed into the time domain to obtain waveforms at the receiver positions. Numerical results are presented for monopole and dipole sources with and without the presence of the Logging Tool, and for a layered formation. To validate our method, we compare our results to published reference data and to results obtained using an in-house finite-difference code. Convergence to a user-specified tolerance for the discretization error confirms the accuracy delivered by our method in the presence of complex geometrical and physical conditions and indicates its potential for the simulation of borehole acoustic measurements.
Christian Michler - One of the best experts on this subject based on the ideXlab platform.
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numerical simulation of borehole acoustic Logging in the frequency and time domains with hp adaptive finite elements
Computer Methods in Applied Mechanics and Engineering, 2009Co-Authors: Christian Michler, Leszek Demkowicz, Carlos TorresverdinAbstract:Accurate numerical simulation of borehole acoustic measurements is of great relevance to improving the efficacy of acoustic Logging techniques and to computationally estimating elastic formation properties. Such simulations require sound physical modeling combined with accurate and efficient numerical discretization and solution techniques. The objective of this paper is to concomitantly model acoustic wave propagation in a fluid-filled borehole coupled with elastic wave propagation both in the probed rock formation and in the elastic Logging Tool. To ensure the accuracy and efficiency of our simulations, we use a self-adaptive finite-element discretization method enhanced with Perfectly-Matched-Layer spatial-domain truncation. This work constitutes the first application of automatic hp-adaptivity to a coupled multi-physics problem, which requires the non-trivial capability of propagating refinements between acoustics and elasticity subdomains through their common interface. Computations are carried out in the frequency domain. Subsequently, using an inverse Fourier transform, frequency-domain solutions are transformed into the time domain to obtain waveforms at the receiver positions. Numerical results are presented for monopole and dipole sources with and without the presence of the Logging Tool, and for a layered formation. To validate our method, we compare our results to published reference data and to results obtained using an in-house finite-difference code. Convergence to a user-specified tolerance for the discretization error confirms the accuracy delivered by our method in the presence of complex geometrical and physical conditions and indicates its potential for the simulation of borehole acoustic measurements.
I.n. Yeltsov - One of the best experts on this subject based on the ideXlab platform.
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UWB electromagnetic borehole Logging Tool
2010 IEEE International Geoscience and Remote Sensing Symposium, 2010Co-Authors: M.i. Epov, V.l. Mironov, K.v. Muzalevskiy, I.n. YeltsovAbstract:Based on a theoretical model of the geosteering borehole Logging Tool, which operates the broadband pulse, we demonstrate the possibility of detecting an interface between oil- and water-saturated layers in the oil-gas formation.
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IGARSS - UWB electromagnetic borehole Logging Tool
2010 IEEE International Geoscience and Remote Sensing Symposium, 2010Co-Authors: M.i. Epov, V.l. Mironov, K.v. Muzalevskiy, I.n. YeltsovAbstract:Based on a theoretical model of the geosteering borehole Logging Tool, which operates the broadband pulse, we demonstrate the possibility of detecting an interface between oil- and water-saturated layers in the oil-gas formation.
Wen-xiao Qiao - One of the best experts on this subject based on the ideXlab platform.
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Research on Test-bench for Sonic Logging Tool
Earth Sciences Research Journal, 2016Co-Authors: Xianping Liu, Wen-xiao Qiao, Baiyong Men, Kai Zhang, Yongchao YaoAbstract:<p>In this paper, the test-bench for sonic Logging Tool is proposed and designed to realize automatic calibration and testing of the sonic Logging Tool. The test-bench System consists of Host Computer, Embedded Controlling Board, and functional boards. The Host Computer serves as the Human Machine Interface (HMI) and processes uploaded data. The software running on Host Computer is designed on VC++, which is developed based on multithreading, Dynamic Linkable Library (DLL) and Multiple Document Interface (MDI) techniques. The Embedded Controlling Board uses ARM7 as the microcontroller and communicates with Host Computer via Ethernet. The Embedded Controlling Board software is realized based on embedded uclinux operating system with a layered architecture. The functional boards are designed based on Field Programmable Gate Array (FPGA) and provide test interfaces for the Logging Tool. The functional board software is divided into independent sub-modules that can repeatedly be used by various functional boards and then integrated those sub-modules in the top layer. With the layered architecture and modularized design, the software system is highly reliable and extensible. With the help of designed system, a test has been conducted quickly and successfully on the electronic receiving cabin of the sonic Logging Tool. It demonstrated that the system could greatly improve the production efficiency of the sonic Logging Tool.</p>
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Design and tests of an acoustoelectric Logging Tool
Journal of the Acoustical Society of America, 2016Co-Authors: Zhao Honglin, Baiyong Men, Wenxing Duan, Wen-xiao QiaoAbstract:The acoustoelectric Logging is a developing method, and the Logging method can interpret the seepage properties of the pore formation especially, such as permeability and so on. A new acoustoelectric Logging Tool is presented. The Tool is composed of two acoustic transmitting transducers, three acoustic receiving transducers, two excitation electrodes, and four receiving electrodes. The transmitting transducers can work in a phased mode, and more radiant energy can be effectively generated. The acoustic radiant energy is a very important factor for the acoustoelectric Logging Tool, and measurements are conducted in an anechoic tank with dimensions of 5.0 m × 5.0 m × 4.0 m. The pulse width of excitation signals is 70μs, and the peak value is above 3000 V. The main frequency of receiving waves is 9.52 kHz, sound pressure is 47.2 kPa, and transmitting voltage response level is 147.5 dB. The Tool is tested in the experimental wells and exploration wells. While the acoustic transmitting transducers radiate aco...
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Test-bench system for a borehole azimuthal acoustic reflection imaging Logging Tool
Journal of Geophysics and Engineering, 2016Co-Authors: Liu Xianping, Wen-xiao Qiao, Baiyong Men, Dong LiuAbstract:The borehole azimuthal acoustic reflection imaging Logging Tool (BAAR) is a new generation of imaging Logging Tool, which is able to investigate stratums in a relatively larger range of space around the borehole. The BAAR is designed based on the idea of modularization with a very complex structure, so it has become urgent for us to develop a dedicated test-bench system to debug each module of the BAAR. With the help of a test-bench system introduced in this paper, test and calibration of BAAR can be easily achieved. The test-bench system is designed based on the client/server model. The hardware system mainly consists of a host computer, an embedded controlling board, a bus interface board, a data acquisition board and a telemetry communication board. The host computer serves as the human machine interface and processes the uploaded data. The software running on the host computer is designed based on VC++. The embedded controlling board uses Advanced Reduced Instruction Set Machines 7 (ARM7) as the micro controller and communicates with the host computer via Ethernet. The software for the embedded controlling board is developed based on the operating system uClinux. The bus interface board, data acquisition board and telemetry communication board are designed based on a field programmable gate array (FPGA) and provide test interfaces for the Logging Tool. To examine the feasibility of the test-bench system, it was set up to perform a test on BAAR. By analyzing the test results, an unqualified channel of the electronic receiving cabin was discovered. It is suggested that the test-bench system can be used to quickly determine the working condition of sub modules of BAAR and it is of great significance in improving production efficiency and accelerating industrial production of the Logging Tool.
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Research and experimental testing of a new kind electrokinetic Logging Tool
Applied Geophysics, 2014Co-Authors: Wen-xiao Qiao, Bai-rong MenAbstract:We designed a new downhole electrokinetic Logging Tool based on numerical simulations and petrophysical experiments. Acoustic and electric receivers cannot be arranged at the same depth, and the proposed composite electrokinetic Logging Tool offers a solution to this problem. The sound field characteristics of the detectors were tested in a water tank in the laboratory. Then, we calculated the sound pressure of the radiated acoustic field and the transmitting voltage response of the transmitting transducers; in addition, we analyzed the directivity and application of the acoustic transmitting probe based on linear phased array. The results suggest that the sound pressure generated at 1500 mm spacing reaches up to 47.2 kPa and decreases with increasing acoustic source frequency. When the excitation signals delay time of adjacent acoustic transmitting subarrays increases, the radiation beam of the main lobe is deflected and its energy gradually increases, which presumably enhances the acoustoelectric conversion efficiency.
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azimuthally acoustic Logging Tool to evaluate cementing quality
Journal of Geophysics and Engineering, 2014Co-Authors: Junqiang Lu, Wen-xiao Qiao, Rui-jia Wang, Xiaodong Ju, Jinping WuAbstract:An azimuthally sensitive acoustic bond Tool (AABT) uses a phased arc array transmitter that can provide directionally focused radiation. The acoustic sonde consists of a phased arc array transmitter and two monopole receivers, the spaces from the transmitter being 0.91 m and 1.52 m, respectively. The transmitter includes eight transducer sub-units. By controlling the high-voltage firing signal phase for each transmitter, the radiation energy of the phased arc array transducer can be focused in a single direction. Compared with conventional monopole and dipole transmitters, the new transmitter provides cement quality evaluation with azimuthal sensitivity, which is not possible with conventional cement bond log/variable density log Tools. Laboratory measurements indicate that the directivity curves for the phased arc array and those computed theoretically are consistent and show good agreement. We acquire measurements from a laboratory cistern and from the field to validate the reliability and applicability of the AABT. Results indicate that the AABT accurately evaluates the azimuthal cement quality of case-cement interfaces by imaging the amplitude of the first-arrival wave. This Tool visualizes the size, position and orientation of channeling and holes. In the case of good case-cement bonding, the AABT also evaluates the azimuthal cementing quality of the cement formation interface by imaging the amplitude of formation waves.
Cheng Xiang-yang - One of the best experts on this subject based on the ideXlab platform.
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Transducer Firing Method for Multi-pole Array Acoustic Logging Tool
High Voltage Engineering, 2009Co-Authors: Cheng Xiang-yangAbstract:Multi-pole array acoustic Logging Tool includes monopole mode operation,dipole mode operation and quadrupole mode operation.The transmitter mandrel consists of monopole transducer,dipole transducer and quadrupole transducer,and all of the transducers are excited by high voltage firing pulses from transmitter electronics.Parameters of firing pulses are various in different modes,which require that transmitter circuits can be easy to control and realize.Complex programmable logic device acts as firing controller.High voltage firing source is composed of power supply circuit,tank circuit,drive circuit,high voltage firing circuit and pulse transformers.Real working parameters can be optimized by experimentations in various conditions.If high voltage energy is fixed,triggering pulse widths of monopole and quadrupole are 30 μs,and that of dipole is 160 μs,then high Signal Noise Ratio wave signals can be received from receiving transducers,and wave features are clear.High temperature test and field test indicate that acoustic Logging Tool based on the transmitter source is fully satisfied with application demands of petroleum downhole environment.
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APPLICATION OF SERIAL DATA TRANSMISSION IN ACOUSTIC Logging Tool
Journal of Southwest Petroleum University, 2009Co-Authors: Cheng Xiang-yangAbstract:High performance acoustic Logging Tool consists of a number of parts,and its structure is complicated.Interface among Tools,internal interface based on control commands and local high-speed data transmission interface are all key problem in technology in the design of the Tool.Down-hole Tools are connected each other by Controller Area Network.Special serial command bus completes interface between main controller and controlled units,and the control bus is applied to connect circuit boards and seal electronic cartridges.Complex programmable logic devices(CPLD) in controlled units decode receives commands and configure parameters accordingly.The rate of control bus is 100kbps.High-speed data transmission interface between boards is composed of sending controller and receiving controller,the two controllers are all accomplished by CPLD and data transmission rate is 5Mbps.Serial data transmission mode is simple and reliable,it can be isolated and shielded easily,and the transmission rate can satisfy practical applications.Acoustic Logging Tools,based on the serial data transmission,were tested in several test wells and exploration wells of petroleum production field,and feasibility and reliability of serial data transfer are validated.
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Design of cross-dipole array acoustic Logging Tool
Journal of China University of Petroleum, 2008Co-Authors: Cheng Xiang-yangAbstract:By analyzing the measuring principle of fourcomponent cross-dipole,a kind of cross-dipole acoustic downhole Tool was designed and the implementation of its measuring technique was given.The proposed Tool was tested in production wells and test wells of various areas.The results show that signal-to-noise ratio(SNR) and characteristics of the measured waves are good,and that slowness curves of fast and slow waves,anisotropy,and fast and slow shear-wave azimuth match well with each other.
