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

1988-06-02

1989-09-12

Tarcza, Thomas H.

Communications, electrical: acoustic wave systems and devices

Wellbore telemetering

Through well fluids

367 43, G01V 140

Patent

active

048666807

ABSTRACT:
Disclosed are improvements pertaining to measurement while drilling apparatus, methods, and systems, including: generation of mud pulse pressure variations in a regime of hydraulic shock waves; transmission of information carrying signals via mud pressure variations which include various interfering signals generally termed "noise" and employing special techniques involving digital filters for accomplishing reception of said information carrying signals; providing hydraulic means to automatically effect periodic closing of the valve means that produces the information carrying signals; providing electrical means to inhibit valve means operation in case of electrical failure in downhole apparatus; providing means which serve to greatly increase the number of satisfactory actuations of said valve means attainable without downhole battery recharge or replacement; providing unique pulse time codes which permit substantial increase in rate of information transmission and the accuracy and precision of such transmission.

REFERENCES:
patent: 3302459 (1967-02-01), Mayers
patent: 3488629 (1970-01-01), Claycomb
patent: 3521037 (1970-07-01), Coll et al.
patent: 3521041 (1970-07-01), Van Blerkom et al.
patent: 3555504 (1971-01-01), Fields
patent: 3742443 (1973-06-01), Foster et al.
patent: 4215425 (1980-07-01), Waggener
Robinson et al., "Principles of Digital Filtering," Geophysics, vol. 24, #3, 6/64, pp. 395-404.
Smith, "A Review of Filtering Seisimic Data," Geophysics, vol. 23, #1, 1/58, pp. 44-57.

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