Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1998-02-05
1999-10-05
Lefkowitz, Edward
Communications: electrical
Condition responsive indicating system
Specific condition
3408531, 3408533, 3408536, 73151, 175 40, 175128, 367 43, 367 83, G08B 2100
Patent
active
059631384
ABSTRACT:
An apparatus for sending signals downhole during drilling operations uses a main pump to pump mud from a mud pit at a substantially constant flow rate. The bulk of the pumped mud goes downhole to maintain adequate circulation for the drill bit. A bypass pipe is provided with a shut-off valve that is controlled by an electronic controller. By pulsing the opening and closing of the shut-off valve, the volumetric flow downhole is pulsed. The pulse amplitude and duration can be controlled. These pulses in the flow rate are detected by a suitable downhole device such as a flow rate measurement device, a pressure detector or a turbine. The initial "wake-up" pulse is made long enough so that the detection device downhole is always able to detect it. Subsequent to this wake-up pulse, adjustments are made to the pulse duration, in steps of about 2 seconds, for the smallest pulse period that is detectable downhole. In addition, the amplitude of the pulses is also controlled by regulating the maximum flow through the shut-off valve. The pulses are modulated by a binary sequence of numbers corresponding to the data to be transmitted.
REFERENCES:
patent: 3971926 (1976-07-01), Gau et al.
patent: 4515225 (1985-05-01), Dailey
patent: 4790393 (1988-12-01), Larronde et al.
patent: 5034929 (1991-07-01), Cobern et al.
patent: 5115415 (1992-05-01), Mumby et al.
patent: 5182730 (1993-01-01), Scherbatskoy
patent: 5318409 (1994-06-01), London et al.
patent: 5799733 (1998-12-01), Ringgenberg et al.
patent: 5812068 (1999-01-01), Wisler et al.
Baker Hughes Incorporated
Lefkowitz Edward
Woods Davetta
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