Mining

Download Measurement While Drilling (MWD) Signal Analysis, by Wilson C. Chin PDF

By Wilson C. Chin

This is often the single publication explaining sleek MWD expertise, to incorporate layout, sign processing and telemetry, providing exact methods to high-data-rate good logging. alternate magazines and evaluation articles describe MWD in informal phrases, reminiscent of confident as opposed to detrimental pulsers, non-stop wave structures, drilling channel noise, and attenuation, frequently with out technical rigor. despite the fact that, few actually clinical discussions can be found on current tools, not to mention the advances invaluable for high-data-rate telemetry. with no powerful beginning construction on good acoustic rules, rigorous arithmetic, and naturally, quick, low-cost and effective trying out of mechanical designs, low info premiums will impose unacceptable caliber concerns to real-time formation overview for years yet to come. This publication delivers to alter all of this. The lead writer and M.I.T. proficient scientist, Wilson Chin, and Yinao Su, academician, chinese language Academy of Engineering, and different staff individuals have written the single booklet on hand that develops dust pulse telemetry from first rules, adapting sound acoustic ideas to rigorous sign processing and effective wind tunnel trying out. in reality, the tools and telemetry ideas built within the booklet have been lately followed via one of many international s greatest commercial enterprises in its project to redefine the face of MWD. the complete engineering heritage for non-stop wave telemetry is roofed anecdotal tales and their fallacies, unique difficulties and their recommendations, various noise mechanisms and their sign processing ideas, obvious paradoxes encountered in box checks and straightforward reasons to advanced questions, etc, are mentioned in whole inform all aspect for college kids, examine professors, engineers alike. those contain sign processing algorithms, sign enhancement tools, and hugely effective brief and lengthy wind tunnel try out tools, whose effects could be dynamically re-scaled to actual muds flowing at any velocity. A must-read for all petroleum engineering execs! within this groundbreaking new quantity, readers will locate: a proof of dust pulse know-how basically utilizing clinical ideas principles exhibiting boundaries of current structures and the way they are often conquer; cutting edge equipment for sign improvements wanted for terribly deep wells positive wave interference, sirens in sequence, targeted diversifications of frequency-shift-keying, and others; a blueprint for high-data-rate dust pulse telemetry followed by means of numerous of the world's best power firms, defined in simple-to-understand phrases, from first ideas and rigorous physics to complex mathematical options for sign processing, noise elimination and echo cancellation; and, new wind brief and lengthy tunnel designs and try methodologies for dust sirens and generators from Wilson Chin, the originator of wind tunnel modeling for downhole functions.

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Additional info for Measurement While Drilling (MWD) Signal Analysis, Optimization and Design

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However, it is now important to model the source itself: Stories from the Field and Fundamental Questions 13 it must create antisymmetric pressure signals and, at the same time, allow up and downgoing waves to transparently pass through it and interfere. It is also necessary to emphasize that wave refraction and reflection methods for very high frequencies (associated with very short wavelengths) are inapplicable. The solution, it turns out, lies in the use of mathematical forcing functions, an application well developed in earthquake engineering and nuclear test detection where long seismic waves created by local anomalies travel in multiple directions around the globe only to return and interfere with newer waves.

This 'p depends on siren geometry, flow rate and rotation speed only: it is independent of reflections since waves pass through without interaction (that is, reflected waves do not affect differential pressure measurements providing both sensing ports are close). 5). This use of higher frequencies is also supported by test results from actual flow loop tests with real muds. We stress that attenuation measurements are subtle since the effects of acoustic nodes and antinodes (which depend on frequency and flow loop boundary conditions) must be properly accounted for.

Our objective is p/'p >> 1 ('p is separately optimized in hardware and wind tunnel analysis). 5). In our designs, we select the frequencies and siren positions, or for sirens-in-tandem, in such a way that high amplitudes are achieved naturally without power or erosion penalties (mud siren signal amplitudes are typically increased by decreasing rotor-stator gap, which leads to higher resistive torques and local sand-convecting flow velocities). 2b. Drillpipe p/'p to 12 Hz. 2c. Drillpipe p/'p to 50 Hz.

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