Abstract: A submersible well pump has a system for monitoring parameters such as pressure and temperature in the vicinity of the motor. The system includes a downhole assembly in the well that has a transmitter for generating a carrier signal and superimposing that signal onto the power cable. Transducers in the downhole assembly sense physical parameters and provide a change in resistance corresponding to the physical parameters. These transducers are connected to a modulator which modulates the carrier signal according to the resistance. A shift register in the downhole assembly sequentially shifts a reference resistor and two or more transducers into the modulating circuit to provide envelopes on the carrier signal corresponding to a synchronizing signal and to data being sensed. The modulated carrier signal is demodulated at the surface into separate channels, where each can provide a readout proportional to the physical parameter sensed.

Abstract: A submersible well pump has a system for monitoring the pressure and temperature in the vicinity of the motor. The system includes a downhole assembly in the well that has a transmitter for generating a signal and superimposing the signal onto the power cable. Transducers in the downhole assembly sense physical parameters such as pressure and temperature and provide electrical responses corresponding to the physical parameters. The transducers are connected to a modulator which modulates the signal provided by the transmitter according to the electrical response of the transducers. The modulated carrier signal is converted at the surface into a readout signal proportional to the physical parameters.

Abstract: A metal from group IVb of the periodic table is used as the target in a reactive deposition process. An inert gas such as argon is admitted within the chamber housing the target. Electrical power at a constant level is supplied to the target, ionizing the inert gas so that the ions bombard the metal target and initiate sputtering. A controlled flow of a reactive gas such as nitrogen is then admitted to the chamber and controlled in such a way that the metal deposition rate is not lowered. The amount of the reactive gas is constantly sampled to provide a control signal used to regulate admission of the reactive gas at the proper rate for most effective deposition of the metal onto the substrate. Closed loop systems regulate the level of electrical power supplied to the target, rate of admission of the inert gas, and rate of admission of the reactive gas.

Abstract: Apparatus for controlling a tongs arrangement which includes a tongs lift and lift speed arrangement, a backup tong and a power driven tong, is characterized by means for generating electrical signals to lift the backup tong and power tong at a predetermined speed to a predetermined elevation, means for generating an electrical signal to close and lock the backup tong when lifted, and means for generating an electrical signal to drive the power driven tong when the backup tong is closed and locked.

Abstract: An oil drilling rig includes a racker, a power tongs, a drawworks having a motor and a brake, and a general purpose programmable digital computer associated with each to sequentially initiate the operation thereof. Closed-loop control systems for the drawworks motor and drawworks brake are included to provide control signals to a motor drive and to a brake actuator.

Abstract: A computer-controlled oil drilling derrick is characterized by apparatus for determining the load supported by a traveling block during motion thereof from a first to second position within an oil drilling rig. The apparatus is operative to output a signal functionally related to the net load on the traveling block. Further, the apparatus outputs an appropriately scaled signal functionally related to the load on the traveling block when in a substantially static condition.

Abstract: A computer - controlled oil drilling rig is characterized by apparatus for comparing signals representative of the actual velocity and direction of travel of a traveling block with signals representative of predetermined minimum and maximum velocities of the traveling block and a signal representative of a predetermined direction of travel of the traveling block. Output signals are generated if the actual velocity signals are greater than the maximum velocity signal or less than the minimum velocity signal and if the direction of the traveling block deviates from the predetermined direction.

Abstract: Apparatus for indicating the position of a traveling block along a vertical axis within a computer-controlled oil drilling rig is characterized by a magnetically responsive element for generating a pulse when a metallic member, movable with the traveling block, passes in proximity thereto. A counter is operatively associated with the magnetically responsive element to count the pulses therefrom. An electrical signal of a predetermined magnitude functionally related to the output of the counter is representative of the position of the traveling block.

Abstract: In a hydraulically powered pipe handling system, a general purpose digital computer is used to control the operation of hydraulically powered racker arms as well as the various auxiliary functions involved in vertical piperacking operations. The manual pipe-racking system (that is, that which is hydraulically powered and under the control of one or more operators) is retained, the computer controlled mode of operation being an alternative system present in the overall design.There is provided to the operator, while the system is in its automatic mode of operation, visual indication of length of drill string, depth of hole, depth of drill bit and composition of the drill string, including number and type of pipe lengths making up the drill string.