Electric generator power supply source for downhole directional survey measure while drilling
Relevance of the research is associated with the need to develop the reliable electric generator power supply sources for downhole directional survey measure while drilling. The main aim is to research the electric generator power supplies, which will take into account operational conditions in controlled directional wells while their drilling. Methods of the research are based on using Automatic Control Theory and imitational simulation under MatLab-Simulink software environment. Results. The authors have determined the design of synchronous generator of downhole directional survey measure while drilling for increased reliability of the generator and developed the functional diagram of electronic part of the power supply of directional survey measure while drilling that allows dividing the information processing channel and data transmission channel to ground surface receivers. The electric generator power supply was simulated taking into account loading of a data transmission channel. The obtained simulation researches were validated by the experimental researches both on laboratory testbench and in field drilling of the controlled directional wells. Findings. The authors found out that to increase reliability of synchronous generators of directional survey measure while drilling one need to equalize the pressures of drilling mud fluid and insulating oil, which fills the generator interiors, by means of rubber compensators. Synchronous generators of directional survey measure while drilling that is loaded via sole rectifier generates internal oscillations of electromagnetic torque, which cause the increasing probability of premature failure of its windings. It was established that using voltage source inverter with galvanic coupling of several loads of various power capacity allows decreasing probability of interferences while processing accelerometer signals. Pre-testing, simulation and design improvements of synchronous generators for directional survey measure while drilling allow increasing their service life for drilling wells. We found that using automated control systems of synchronous generators for directional survey measure while drilling allows controlling their function, saving operational time and increasing reliability of electric generator power supplies.