[특허]Method for estimating formation in-situ stress magnitudes using a sonic borehole tool

[미국특허] Method for estimating formation in-situ stress magnitudes using a sonic borehole tool 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	G01V-001/40
출원번호	US-0789441 (1997-01-27)
발명자 / 주소	Sinha Bikash K.
출원인 / 주소	Schlumberger Technology Corporation
대리인 / 주소	Garrod
인용정보	피인용 횟수 : 37 인용 특허 : 6

초록 ▼

A method of estimating formation in-situ stress magnitude and nonlinear constants of an earth formation traversed by a borehole includes analyzing the flexural wave dispersions for dipole sources aligned parallel and perpendicular to the maximum far-field compressive stress direction together with the Stoneley wave dispersion derived from a monopole source. In the presence of formation and borehole stresses above and beyond those in an assumed isotropic reference state, the borehole flexural and Stoneley wave velocity dispersions are also functions of the formation stresses and nonlinear constants. A multi-frequency inversion of the flexural or Stoneley wave velocity dispersions over a selected frequency band is performed to determine the uniaxial stress magnitude S and the quantities ]EQU1 ] where c.sub.111, c.sub.112, and c.sub.123 are the formation non-linear constants.

대표청구항 ▼

[ What I claim is:] [1.] A method of estimating in-situ stress magnitude of an earth formation traversed by a borehole containing borehole fluid by utilizing a sonic logging tool having a monopole source, a plurality of dipole sources, and a plurality of sonic detectors, said method comprising:a) generating a relatively low frequency signal and a relatively high frequency signal with at least one source;b) detecting the slow flexural, fast flexural, and Stoneley wave arrivals at the detectors for the relatively low frequency signal and the relatively high frequency signal;c) determining the Stoneley wave velocity as a function of frequency;d) determining the azimuthal orientation of the maximum velocity of at least one of the slow and fast flexural wave arrivals for at least one of the relatively low frequency signal and the relatively high frequency signal;e) determining the velocities of the slow and fast flexural waves, as a function of frequency, for the relatively low frequency signal and for the relatively high frequency signal at the determined azimuthal orientation and at an orientation normal thereto;f) associating formation anisotropy with stress in the formation if, at the determined azimuthal orientation, the velocity of the fast flexural wave for one of the relatively high frequency signal and the relatively low frequency signal is greater than the velocity of the slow flexural wave, and at the orientation normal to the determined azimuthal orientation, for the other of the relatively high frequency signal and relatively low frequency signal, the velocity of the fast flexural wave is greater than the velocity of the slow flexural wave; and, if formation anisotropy is associated with stress in the formation;g) selecting a reference state velocity;h) determining a velocity change, B, due to uniaxial stress, at a plurality of discrete frequencies; andi) determining the stress magnitude and a plurality of non-linear formation parameters according to the equation: EQU A.sub.1 S+A.sub.2 Sc.sub.111 /c.sub.66 +A.sub.3 Sc.sub.112 /c.sub.66 +A.sub.4 Sc.sub.123 /c.sub.66 =B, re A.sub.1, A.sub.2, A.sub.3, A.sub.4, and B are functions of frequency, c.sub.66 is the formation shear modulus in the reference state, and A.sub.1, A.sub.2, A.sub.3, and A.sub.4 are frequency dependent sensitivities of flexural wave velocities to S, Sc.sub.111 /c.sub.66, Sc.sub.112 /c.sub.66, and Sc.sub.123 /c.sub.66, respectively.

이 특허에 인용된 특허 (6) 인용/피인용 타임라인 분석

Sondergeld Carl H. (Broken Arrow OK) Smith Martin L. (Broken Arrow OK), Acoustic well logging method and system for obtaining a measure of formation anisotropy.
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Sinha Bikash K. (West Redding CT) Kostek Sergio (Ridgefield CT), Identification of stress induced anisotropy in formations.
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Hoyle David C. (Houston TX) Chang Shu-Kong (West Redding CT) Varga Gyula (Brookfield CT), Logging tool housing with acoustic delay.
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Sinha, Bikash K.; Kostek, Sergio, Measurement of nonlinear properties of formation using sonic borehole tool while changing pressure in borehole.
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Plumb Richard A. (14 Webb Rd. North Tarrytown NY 10591) Dave Yogesh S. (100-31 Hope St. Stamford CT 06906), Methods and apparatus for borehole measurement of formation stress.
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Hoyle David C. (Houston TX) Wignall Albert H. (Friendswood TX) Walulik James J. (Houston TX), Sonic well logging tool transmitter.
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이 특허를 인용한 특허 (37) 인용/피인용 타임라인 분석

Chang, Chung, Acoustic source using a shaftless electrical hammer.
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Jørgensen, Ole, Borehole seismic inversion in anisotropic formation.
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Papanastasiou,Panos, Cavity stability prediction method for wellbores.
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Bracken, Marc; Yusuf, Shabbir, Detecting leaks in a fluid distribution system.
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Sinha,Bikash K., Determination of stress characteristics of earth formations.
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Sayers, Colin Michael, Determining maximum horizontal stress in an earth formation.
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Bikash K. Sinha, Determining stress parameters of formations from multi-mode velocity data.
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Johnson, Paul A.; Tencate, James A.; Le Bas, Pierre-Yves; Guyer, Robert; Vu, Cung Khac; Skelt, Christopher, Device and method for imaging of non-linear and linear properties of formations surrounding a borehole.
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Fleury, Jr., Leo W.; Dintakurti, Ganapathi Deva Varma; Williams, James O.; Yusuf, Shabbir, Enclosure for leak detector.
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Sinha, Bikash K., Estimating formation stresses using radial profiles of three shear moduli.
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Sinha, Bikash K., Estimating formation stresses using radial profiles of three shear moduli.
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Sinha, Bikash K., Estimating formation stresses using sonic data.
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Fleury, Jr., Leo W.; Dintakurti, Ganapathi Deva Varma; Richarz, Werner Guenther; Williams, James O.; Yusuf, Shabbir; Hiller, Timothy Scott Edward; Mercer, Steven James; Janhunen, Stefan Erik, Fire hydrant leak detector.
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Hyland, Gregory E.; Keefe, Robert Paul; Zakas, Marietta Edmunds; Barker, Clayton Robert, Infrastructure monitoring devices, systems, and methods.
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Hyland, Gregory E.; Keefe, Robert Paul; Zakas, Marietta Edmunds; Barker, III, Clayton Robert, Infrastructure monitoring devices, systems, and methods.
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Dintakurt, Ganapathi Deva Varma; Yusuf, Shabbir; Mercer, Steven James, Leak detector.
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Richarz, Werner Guenther; Myles, Andrea; Yusuf, Shabbir, Leak detector and sensor.
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Lei, Ting; Sinha, Bikash, Method and system for determination of horizontal stresses from shear radial variation profiles.
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Sayers, Colin M.; Birchwood, Richard A., Method and system for pre-drill pore pressure prediction.
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Pistre, Vivian; Yan, Gongrui; Sinha, Bikash K.; Prioul, Romain, Method and system to determine the geo-stresses regime factor Q from borehole sonic measurement modeling.
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Donald,J. Adam; Bratton,Tom R.; Walsh,John, Method for characterizing shear wave formation anisotropy.
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Bratton, Tom R.; Sinha, Bikash K.; Alatrach, Samer, Method of using dipole compressional data to determine properties of a subterranean structure.
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Sayers, Colin M., Method, system and apparatus for determining rock strength using sonic logging.
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Bratton, Tom R.; Sinha, Bikash Kumar; Plona, Thomas J.; Jeffryes, Benjamin P., Methods and systems for determining formation properties and in-situ stresses.
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Leggett, III,James V.; Dubinsky,Vladimir, Methods of generating directional low frequency acoustic signals and reflected signal detection enhancements for seismic while drilling applications.
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Prioul, Romain; Sun, Haitao; Jocker, Jeroen, Methods to estimate subsurface deviatoric stress characteristics from borehole sonic log anisotropy directions and image log failure directions.
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Chemali, Roland E.; Oraby, Moustafa E., Micro-sonic density imaging while drilling systems and methods.
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Zusman, George V., Piezoelectric vibration sensor for fluid leak detection.
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Moos, Daniel, Predicting hydraulic fracture propagation.
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Sinha, Bikash K.; Vissapragada, Badarinadh, Radial profiling of formation mobility using horizontal and vertical shear slowness profiles.
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Bose, Sandip; Shenoy, Ramachandra Ganesh, Sonic well logging for alteration detection.
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Plona, Thomas; Sinha, Bikash K.; Kane, Michael; Shenoy, Ramachandra Ganesh; Bose, Sandip, Sonic well logging for characterizing earth formations.
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Sinha, Bikash K.; Burridge, Robert; Kane, Michael R., Sonic well logging for radial profiling.
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Moos, Daniel, Stress in formations from azimuthal variation in acoustic and other properties.
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Bakulin, Andrey; Sinha, Bikash K.; Prioul, Romain Charles Andre, System and method for estimating subsurface principal stresses from seismic reflection data.
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Sinha, Bikash K.; Ikegami, Toru; Johnson, David Linton; Pabon, Jahir, Use of an effective tool model in sonic logging data processing.
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Sinha, Bikash K.; Ikegami, Toru; Johnson, David Linton; Pabon, Jahir, Use of an effective tool model in sonic logging data processing.
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[미국특허] Method for estimating formation in-situ stress magnitudes using a sonic borehole tool 원문보기