Method and apparatus for transmitting and processing data from w

Details Method and apparatus for transmitting and processing data from w Method and apparatus for transmitting and processing data from w

1987-06-03

1989-07-25

Tarcza, Thomas H.

Communications, electrical: acoustic wave systems and devices

Wellbore telemetering

367 25, H04H 900

Patent

active

048520705

ABSTRACT:
A method and apparatus is disclosed for avoiding problems caused by a logging tool sticking in a borehole and subsequently accelerating when it becomes free. Such problems give rise to measurement errors and loss of data, particularly when the tool is in the vicinity of ground discontinuities where the data is especially valuable. In accordance with the method and apparatus, data is stored in the tool as it is moved within the borehole, the data being stored in a manner which varies in accordance with any difference between the actual motion of the tool in the borehole and the apparent motion of the tool as measured at the surface. The stored data is transmitted from the tool to the surface at a rate within a transmission bandwidth capacity of a communication link. According to one arrangement, means are provided for shifting the writing position of data entered into a memory, the shifting means being responsive to an error signal related to any difference between the actual and apparent motions of the tool. The memory may also be operated in a FIFO mode.

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patent: 4649512 (1987-03-01), Nukiyama
patent: 4672646 (1987-06-01), Van Maren
patent: 4684947 (1987-08-01), Zimmer

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