Method and apparatus for transmitting information in a borehole

Details Method and apparatus for transmitting information in a borehole Method and apparatus for transmitting information in a borehole

1991-08-23

1993-01-26

Lobo, Ian J.

Communications, electrical: acoustic wave systems and devices

Wellbore telemetering

Through well fluids

367 43, G01V 140

Patent

active

051827301

ABSTRACT:
In conducting measurement operations in drill holes useful downhole information is obtained by selectively filtering data signals carrying the information from mixed signals. The mixed signals result from a mixture of the data signals and interfering signals. The data signals are arranged in a coded sequence of individual signals having a characteristic shape. Control signals representing the characteristic shape are produced. The mixed signals, which are received on the surface from a downhole location, and the control signals are converted to resultant signals that represent the data signals, wherein the effect of interfering signals is diminished.

REFERENCES:
patent: 3302457 (1967-02-01), Mayes
patent: 3488629 (1970-01-01), Claycomb
patent: 3521037 (1970-07-01), Coll et al.
patent: 3521041 (1970-07-01), Van Blerkom
patent: 3555504 (1971-01-01), Fields
patent: 3742443 (1973-06-01), Foster et al.
patent: 4215425 (1980-07-01), Waggener
patent: 4866680 (1989-09-01), Scherbatskoy
Robinson, et al., "Principles of Digital Filtering," Geophysics, vol. 24, #3, Jun. 1964, pp. 395-404.
Smith, "A Review of Filtering Seisimic Data," Geophysics, vol. 23, #1, Jan. 1958, pp. 44-57.

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