Abstract:
A heavy-duty coupling unit that incorporates a sensitive torquemeasuring device. It has provision for being mounted on the end of a torque-load transmitting shaft, and it has a folded-back structure so as to accommodate a gear or the like for a laterally coupled drive.
Abstract:
The rotary speed of a rotary drive system, including a rotary engine, for a drill in a well is maintained at a predetermined value and is sensed by a tachometer. An electrical signal from the tachometer is converted to a pneumatic signal by an electropneumatic transducer which is applied to a receiver-controller receiving a supply of filtered air at a predetermined pressure. When the electrical signal from the tachometer changes due to a change in the rotary speed of the rotary drive system from the predetermined value, the pneumatic output from the receiver controller changes accordingly until the rotary speed of the rotary drive system is once again at the predetermined value. The pneumatic output from the receiver controller remains at the pressure which returned the rotary speed to its predetermined value. In achieving speed control, the pneumatic output from the receiver controller is effectively amplified by a booster relay receiving filtered air at a second predetermined pressure to provide a pneumatic signal. The pneumatic signal from the booster relay is applied to the throttle of the rotary engine to control the engine''s rotary speed and hence the rotary speed of the rotary drive system and drill.
Abstract:
A method and several mechanisms for carrying out the method are disclosed. The method of (1) generating torque pulses by engaging a drill bit on the lower end of a rotating drill string in the bottom of a wellbore, and (2) monitoring the top of the drill string for the torque pulses therein may be practiced by a drill bit disconnectably attached with a coupling to the lower end of a drill string in a wellbore for being momentarily and precisely uncoupled and coupled during drilling to interrupt the torque transmission for generation of torque pulses in the drill string for being monitored at the surface. Mechanical, electrical, and fluid operated couplings are disclosed for rapidly coupling and uncoupling the drill bit from the drill string.
Abstract:
A method and apparatus for monitoring the wear on a rotary drill bit including means for measuring the revolutions of the drill string and the weight on the bit, and for obtaining the product thereof, such product being a measure of the wear on the bit. A pulse train is generated having a pulse rate proportional to the weight on the bit. Controlled portions of the pulse train are registered in a counter, the portions being proportional in duration to the number of revolutions turned by the bit, with the result that the accumulated count registered provides at any time the integrated product of weight and revolutions, as a measure of bit wear.