A New Generation Crossed Dipole Logging Tool: Design and Case Histories

Kessler, Calvin; Arian, Abbas; Varsamis, Georgios; Wisniewski, L.T.

doi:10.2523/71740-ms

Cited by 4 publications

(2 citation statements)

References 1 publication

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“…This technology is widely used in petroleum exploration. For the moment, the mainly typical tools are Sonic Scanner of Schlumberger, the XMAC of Baker Atlas, WaveSonic of Halliburton, etc [4][5][6][7][8]. For meeting the requirements of increasingly complex petroleum exploration, similar new acoustic tools are under developing in China.…”

Section: Introductionmentioning

confidence: 99%

MPAL Cross-Dipole Array Acoustic Logging Data Processing

Che

Qiao

Wang

2009

2009 2nd International Congress on Image and Signal Processing

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Formation anisotropy evaluation is very important for complex reservoir in petroleum exploration. Cross-dipole array acoustic well logging technology breaks the restriction that shear waves could not be measured in soft formations. The cross-dipole acoustic data can be used to study the formation anisotropy. This paper presents an example of cross-dipole application of MultiPole Acoustic Logging (MPAL) tool made in China. The fourcomponent cross-dipole data is processed and analyzed. The output slowness of fast shear waves and slow shear waves, anisotropy, azimuth of fast shear waves and slow shear waves are used to evaluate the azimuthal anisotropy around borehole.

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Section: Introductionmentioning

confidence: 99%

MPAL Cross-Dipole Array Acoustic Logging Data Processing

Che

Qiao

Wang

2009

2009 2nd International Congress on Image and Signal Processing

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“…White [1] proposed the method of using dipole acoustic waves generated by multi-pole source in the borehole to measure the properties of loose or soft formation in 1967. The function and application of acoustic well logging is enlarged with the development of combination of quadrupole source, dipole source and monopole source [2][3][4] . Now, new acoustic logging tools worldwide all use dipole transducers.…”

Section: Introductionmentioning

confidence: 99%

Effects of boundary conditions on vibrating mode of acoustic logging dipole transducer

Qiao

Che

Zhang

2008

Sci. China Ser. D-Earth Sci.

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Acoustic transducer is an important part of acoustic well logging tool. In this paper, ANSYS software package is used to design acoustic dipole transducer and simulate vibrating mode of the dipole transducer in different mechanical boundary conditions. The results show that boundary conditions influence the number of vibrating mode in the same frequency band and the frequency value of the same vibrating mode. Several acoustic dipole transducers are designed according to the results of numerical simulation and laboratory measurements. The basic frequency of vibrating mode of experiment has good agreement with that of simulation. The numerical simulation plays a good guidance role in designing, producing and correctly installing the acoustic dipole transducer.acoustic dipole transducer, vibrating mode, basic frequency, acoustic well logging

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Application of Shear Anisotropy from a New Generation Crossed Dipole Acoustic Tool

Fogal

Kessler

Varsamis

2002

SPE Annual Technical Conference and Exhibition

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A new generation crossed-dipole acoustic-logging tool acquires data that can be utilized to calculate shear anisotropy. This new tool, the WaveSonic™ tool, was designed using a systems approach so that tool functions such as transmitted pulse shape, center frequency, amplitude and duration are programmable from the surface. Additionally, the tool design is robust enough to allow drillpipe conveyance if well conditions warrant. It can also be combined with other logging tools and is "double-ended", allowing it to be located at any position in the logging tool-string. Shear data can be collected in orthogonal X-Y directions and oriented by a navigational package using data from a four or six-arm caliper device run with the WaveSonic tool. From these measurements, shear slowness anisotropy can be determined, as well as the direction of the fast shear slowness. These slowness values provide input to a model that calculates maximum and minimum principal stresses and their orientations. Information about principal stresses can be instrumental in optimizing completion and stimulation design. In cases where natural fracture information is desired, crossed dipole data can be used to help detect and orient such fracture systems. Introduction The WaveSonic crossed dipole sonic tool is an entirely new wireline sonic tool design.1 The design engineers and scientists were given the luxury of designing the tool "from the ground up", without being required to incorporate legacy features from other tool platforms. The key mechanical design requirement was physical strength, so that the crossed dipole sonic tool could be positioned anywhere in the tool string, allowing extremely "heavy" tools, such as new generation pump-through formation test tools and nuclear magnetic resonance tools, to run in combination below (or above) this tool. The WaveSonic tool is the first acoustic waveform wireline logging tool designed robustly enough to allow drillpipe-conveyed logging operations, where necessary. The WaveSonic tool is composed of the following components: transmitter with associated control electronics, isolator, receiver array and main electronics. All tool functionality is controlled by a surface computer, thus eliminating the necessity to pull out of the hole to change logging parameters. One of the key features of this tool is the ability to control the frequency of the crossed dipole source, allowing flexural shear wave transmission in reservoir rocks having a broad range of shear slowness values. Dipole transmitters are of the "Bender Bar" variety. The "X" and "Y" dipole sources are mounted orthogonally at the same position of the tool, ensuring maximum utilization of all received waveforms for post-processing analysis. The receiver array consists of 8 receiver "rings" spaced 0.5 feet apart. Each receiver ring is comprised of four independent receivers that are matched for frequency response and oriented in the directions of the "X" and "Y" transmitters. Detailed shear anisotropy analysis necessitates matching of frequency responses of receivers over a broad band of frequencies. The tool transmitters (monopole, and X- and Y-dipole) are fired sequentially, and all 32 waveforms associated with each transmitter firing are digitized and sent uphole - real-time - for every 0.5 feet of log. The logging speed for crossed dipole acquisition is 30 ft/min (1800 ft/hour).

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A New Generation Crossed Dipole Logging Tool: Design and Case Histories

Cited by 4 publications

References 1 publication

MPAL Cross-Dipole Array Acoustic Logging Data Processing

MPAL Cross-Dipole Array Acoustic Logging Data Processing

Effects of boundary conditions on vibrating mode of acoustic logging dipole transducer

Application of Shear Anisotropy from a New Generation Crossed Dipole Acoustic Tool

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