Operations Manual
Introduction to the D-Tech Rotary Steerable System Founded in 2007,D-Tech set out to deliver an economical rotary steerable solution to operators and Directional Companies. In late 2014, The D-Tech Rotary Steerable System commercially entered the US Land market and as of 2024, is currently on its fifth iteration, with over 100 design improvements. The current tool fleet comprises 5 7/8 in. (149.225mm) to 18 1/8 in.(460.375mm). D-Tech’s low-risk, high-return rotary steerable tool was engineered to meet and overcome drilling challenges, with an emphasis on reliably reaching total depth quickly, accurately, and with reduced financial risk. RST BHA Design Theory The three points are the bit, the steering body, and the top stabilizer, which must always be to a minimum of 1/8 under hole gauge and spiral wrapped for wellbore contact. The variability in steering geometry comes from the steering body which is constantly rotating at the same speed as the total bit RPM. If running separate string stabilizers above the RST tool, it is best practice to choose non-magnetic spiral stabilizers with the shortest tong end possible. Overly long tong ends affect the geometry and have a negative impact on steering efficiency. D-Tech has run many BHA combinations over the years and will work with the client to recommend the best BHA design for the application. D-Tech Functionality The D-Tech Rotary Steerable Tool operates as a push-the-bit system. The tool utilizes six hydraulically activated pistons in pairs, 120 degrees apart, to push against the wellbore and drive the BHA in the desired direction. The pistons achieve force by diverting a percentage of the drilling fluid into the pistons. A bit pressure drop is calculated to generate the force at pistons by creating a difference in pressure from inside the D-Tech tool and the annulus. The tool is powered by a turbine generator with no additional batteries required. The tool is fully rotated at bit RPM, and there are no slow rotation components in the tool.
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