Operations Manual
Turbine and Generator Assembly – This assembly supplies power to the RST, it uses the energy of the drilling fluid to spin the turbine at an engineered speed to generate the required power to the RST system. Each RST size has a range of turbine impeller designs to cater to the appropriate flow range for the tool. It is recommended to run a downhole filter sub to limit debris from damaging the turbine/generator assembly. Motor Valve Assembly (MVA) – The MVA attaches directly onto the steering body and directs 5 to11% of the drilling fluid depending on tool configuration into the flow galleries to achieve force at the pistons. The assembly contains a brushless DC motor which orients the valve to the required position as calculated by the CU chassis. Pre-Run Information Required 1. Hole Size – in inches or milometers 2. Mud Weight – TFA calculations require the planned mud weight for the well. It is recommended to run all calculations off the maximum mud weight for the well. If mud weight changes, flow rate will need to be adjusted to maintain maximum force at the pistons. 3. Flow Rate – minimum and maximum planned flow rates. What will be the flow rate at the beginning of the run and at the end of the run? It may be necessary to reduce starting flow rate to allow for reduced flow at the end of the run or during lost circulation operations. 4. Motor Bypass – If the run is motor assisted, an anticipated motor bypass must be accounted for. It is important to verify whether the motor is mud lubed or seal bearing. Work with the motor provider to get an accurate motor bypass. 5. Bit Information – Certain information about the bit is needed as well for calculating the bit TFA, the number of jets as well as any fixed ports.
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