Title: Dual function logging tool and method

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Claims: What is claimed is:

1. A system for simultaneously logging two well bore parameters comprising:

a logging tool adapted to traverse a well bore;

a first parameter detector carried by said tool for providing a first data signal in the form of variable amplitude, variable frequency pulses;

an oscillator carried by said tool for providing a series of constant amplitude reference pulses;

a second parameter detector carried by said tool for providing a second data signal in the form of variable frequency pulses equal in amplitude to said reference pulses;

cable means for transmitting said first and second data signals and said reference pulses to the surface as a combined signal;

means at the surface for modifying the amplitude of said combined signal responsively to the amplitude of said reference pulses and said second data signal;

means at the surface for separating said first data signal from said combined signal on the basis of amplitude;

means at the surface for recording said first data signal; and,

means at the surface for recording the number of pulses in said second data signal.

2. The system of claim 1 wherein said means for recording the number of pulses in said second data signal includes:

means for providing an offset signal related in frequency to the frequency of said reference pulses; and,

means for algebraically combining said offset signal with said second data signal and said reference pulses.

3. In a data transmission system wherein amplitude variable data pulses and predetermined amplitude reference pulses are transmitted over a common transmission link, the method of transmitting additional data over the same transmission link without interference comprising the steps of:

a. providing a minimum acceptable number of constant frequency pulses;

b. providing a series of pulses related in number to the additional data to be transmitted;

c. providing constant amplitude pulses related in number to the sum of the constant frequency pulses and the additional data related pulses;

d. transmitting over the transmission link both the amplitude variable data pulses and the constant amplitude reference pulses;

e. separating the transmitted reference pulses from the transmitted amplitude variable data pulses; and,

f. subtracting from the separated reference pulses a number of pulses related to the constant frequency pulses to thereby provide a series of pulses related in number to the additional data.

4. A method of transmitting two data signals over a common line comprising the steps of:

a. providing a first data signal in the form of variable amplitude pulses;

b. providing a second data signal in the form of variable frequency pulses;

c. providing a constant amplitude reference signal having a frequency related to the sum of a predetermined constant frequency and the second data signal;

d. transmitting the reference signal and the first data signal over a common line;

e. separating the transmitted first data signal pulses from the transmitted reference pulses;

f. modifying the amplitude of the first data signal as a function of the amplitude of the transmitted reference pulses to thereby provide a first data output signal; and,

g. reducing the number of transmitted reference pulses by a number related to the predetermined constant frequency to thereby provide a second data output signal.

Other info:

Inventors: Kampfer, John G. (Houston, TX, US)

Application Number: 471900
Filing Date: 1974-05-21
Publication_date: 1976-01-27
Assignee: Halliburton Company (Duncan, OK)
Primary Class(es): 340/854.9 250/256, 327/98, 327/105, 340/855.4, 340/870.19
Other Classes:
US Patent Ref:

2998521	Aug, 1961	Ranki, Jr.	250/263.
3445658	May, 1969	Ward	250/263.
3612771	Oct, 1971	Caniquit	179/15.
3697875	Oct, 1972	Guanella	325/42.
3732495	May, 1973	McRae et al.	340/203.

Other Refs:
Primary Examiner: Tubbesing, T. H.
Assistant Examiner: Birmiel, H. A.
Attorney: Burns, Doane, Swecker & Mathis