Operations Manual
Collar – All D-Tech RST tool sizes use a proprietary collar to house the internal electronics of the tool. The collar is made of Non-Magnetic Alloy, similar with that used on most MWD tools. The collars meet all BSR (Bending Strength Ratio) guidelines recommended by the American Petroleum Institute and TH Hill and Associates. Stabilizer – The D-Tech Rotary Steerable utilizes a stabilizer to complete the 3-point geometry, using either a stabilizer sleeve incorporated into the collar or a separate stabilizer sub above the control collar, dependent upon tool size and configuration. A 1/8 in. under hole gauge spiral non-mag stabilizer is recommended to ensure the RST remains centralized in the wellbore. Steering Body – All D-Tech tools share a common push-the-bit style steering body with six pistons. The pistons receive 5 to 11% of the drilling fluid which is bypassed and diverted to each bank of pistons by the motor valve assembly. The steering body pistons are arranged 120 degrees radially allowing for 360-degree directional control. The steering body is a purely mechanical unit, no electronics are housed in the assembly. Control Unit – The D-Tech control unit (CU) consists of the chassis, turbine, generator assembly, and motor valve assembly, housed inside a pressure case and installed inside the RST collar. The CU is utilized across all tool size and only changes to the turbine, internal stabilization anchors, and motor are required for tool size configuration. Control Unit Chassis – The CU chassis houses a full directional package with 3 tri-axial accelerometers and magnetometers, a processing unit, and power supply unit. The tool measures and records relevant information such as turbine speed, inclination, shock, vibration, and other tool specific data. The CU chassis has a single 1.5v lithium battery to record a time stamp to memory and has no impact on tool function or service delivery.
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