Boring or penetrating the earth – With signaling – indicating – testing or measuring – Indicating agent released in drilling fluid
Patent
1986-03-04
1987-11-24
Leppink, James A.
Boring or penetrating the earth
With signaling, indicating, testing or measuring
Indicating agent released in drilling fluid
731515, 175 48, E21B 4400
Patent
active
047082127
ABSTRACT:
Lag-determining method and apparatus which provides for determination of and an indication of when borehole cuttings from preselected depths arrive at the surface of the earth is disclosed and includes devices for inputting the value of the lag strokes and the predetermined drilling depth increments. A signal representative of the actual drilling depth is provided to a computer circuitry. Counter circuitry accumulates a count of the strokes of the positive displacement mud pump. Adder circuitry sums the lag strokes and the accumulated count of the mud pump. Comparator circuitry provides an output when the compared values of the accumulated number of strokes of the positive displacement mud pump equals the sum of the lag strokes and the strokes of the positive displacement mud pump at a predetermined depth plus the depth increment. Visual and audio indications provide notification of the arrival of borehole cuttings from preselected depths.
REFERENCES:
patent: 3477526 (1969-11-01), Jones et al.
patent: 3541852 (1970-11-01), Brown et al.
patent: 4290305 (1981-09-01), Gibson et al.
patent: 4401169 (1983-08-01), Neshyba
Eppler Susan G.
McAuley James A.
Dang Hoang C.
Leppink James A.
TTE Holding Corp.
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