TRANSMISSION BEHAVIOR OF MUD-PRESSURE PULSE ALONG WELL BORE |
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| Authors: | LIU Xiu-shan LI Bo YUE Yu-quan |
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| Affiliation: | 1. Petroleum Drilling Research Institute, Exploration and Production Research Institute of Sinopec Corp., Dezhou 253005, China;2. Technical Department, Tianjin Branch of CNOOC Ltd., Tianjin 300452, China;3. Jinzhou Oil Production Plant, Liaohe Oilfield Branch of PetroChina, Linghai 121209, China;1. Beijing Key Laboratory of Process Fluid Filtration and Separation, College of Mechanical and Transportation Engineering, China University of Petroleum, Beijing 102249, China;2. State Key Laboratory of Multiphase Flow in Power Engineering, Xi''an Jiaotong University, Shaanxi 710049, China;3. Shanghai Marine Diesel Engine Research Institute, Shanghai 201108, China;1. Department of Physiology and Biomedical Engineering, Mayo Clinic College of Medicine, Rochester, MN 55905, United States;2. Department of Bioengineering, University of Washington, Seattle, WA 98105, United States |
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| Abstract: | In oil and gas industry,mud-pulse telemetry has been widely used to obtain directional data,drilling parameters,formation evaluation data and safety data,etc. Generally,the drilling mud in most current models was considered to be a single-phase fluid through which the mud pulses travel,despite the fact that the drilling mud is composed of two or more phases. In this article,a multiphase flow formula was proposed to calculate the mud-pulse velocity as mud solids and free-gas content change,and a mathematical model was put forward to simulate the dynamic-transmission behavior of the mud-pressure pulse or waves. Compared to conventional methods,the present model provides more accurate mud-pulse attenuation,and the dynamic-transmission behavior of drilling-mud pulses along well bores can also be easily examined. The model is valuable in improving the existing mud-pulse systems and developing new drilling-mud pulse systems. |
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| Keywords: | measurement-while-drilling (MWD) closed-loop drilling multiphase flow numerical simulation |
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