[특허]Method and apparatus for logging-while-drilling with improved performance through cancellation of systemic errors throug

Method and apparatus for logging-while-drilling with improved performance through cancellation of systemic errors throug 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	G01V-003/30
출원번호	US-0820091 (1992-01-13)
발명자 / 주소	Meador Richard A. (Spring TX) Meisner James E. (Citrus Heights CA) Hall Ronald A. (Sacramento CA) Thompson Larry W. (Spring TX) Mumby Edward S. (Carmichael CA)
출원인 / 주소	Baker Hughes Incorporated (Houston TX 02)
인용정보	피인용 횟수 : 40 인용 특허 : 0

초록 ▼

A logging-while-drilling system is disclosed which includes a pair of receiving antenna disposed between upper and lower transmitting antenna. The upper and lower transmitting antenna are energized successively to generate an electromagnetic wave which propagates through the formation surrounding the borehole. The amplitude attenuation and phase shift of the electromagnetic wave between the receiving antenna is measured. Measurements from both the upper and lower transmitting antenna can be combined to eliminate by cancellation system error components. In order to further improve the performance of the logging-while-drilling system, separate and dedicated driver circuits are provided proximate each transmitter. In addition, reference signals which are utilized to coordinate and synchronize the operation of the various components of the logging-while-drilling system are provided at frequencies which are substantially different from the interrogation frequency of the electromagnetic interrogation signal.

대표청구항 ▼

A logging apparatus for use in a wellbore for determining resistivity of a formation when coupled to a wellbore tubular and suspended in said wellbore, comprising: a housing, including means for coupling said housing to said wellbore tubular; first and second transmitters, spaced apart a selected distance on said housing, each transmitter being individually and selectively operable for producing an electromagnetic interrogating signal at a selected interrogation frequency for passage through portions of said formation which surround said wellbore; first and second receivers, spaced apart a selected distance on said housing in a selected position relative to said first and second transmitters, each receiver being tuned to receive electromagnetic signals at said interrogation frequency to the exclusion of other frequencies; wherein a portion of said formation which is disposed about said wellbore between said first and second receivers has a resistivity value which can be derived from at least one of (a) amplitude attenuation of said electromagnetic interrogating signal directed between said first and second receivers as determined from measurements of said electromagnetic interrogating signal taken by said first and second receivers, and (b) phase shift of said electromagnetic interrogating signal between said first and second receivers as determined from measurements of said electromagnetic interrogating signal taken by said first and second receivers; said logging apparatus includes a plurality of system error components which are manifest as (a) amplitude-effecting error components including transmitter amplitude output variation and receiver sensitivity variation, and (b) phase-effecting error components including transmitter phase variation and receiver phase variation; and a controller member for alternately energizing said first and second transmitters in (a) a first sample mode of operation with said electromagnetic interrogating signal passing through said formation in a direction from said first receiver to said second receiver and (b) a second sample mode of operation with said electromagnetic interrogating signal passing through said formation in a direction from said second receiver to said first receiver, for selectively obtaining measurements of said electromagnetic interrogating signal with said first and second receivers, and for combining said measurements to eliminate by cancellation said system error components.

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Method and apparatus for logging-while-drilling with improved performance through cancellation of systemic errors throug 원문보기

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연합인증

Method and apparatus for logging-while-drilling with improved performance through cancellation of systemic errors throug 원문보기

초록 ▼

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