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Magnetic Source Design of Rotary Magnetic Ranging System

Author: SongPan
Tutor: YuRunQiao
School: Nanchang University of Aeronautics and
Course: Measuring Technology and Instruments
Keywords: Rotary Magnetic Ranging System Magnetic source Rotating magnetic field Magnetic dipole
CLC: P631.23
Type: Master's thesis
Year: 2010
Downloads: 102
Quote: 0
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Abstract


China is rich in coal-bed gas resources, in the same time, The geologic conditions of Chinese coal-bed gas resources is complicated. Multi-lateral horizontal wells and U-well drilling technology on the basis of foreign countries in coal-bed gas drilling technology, combined with Chinese unique conditions of coal-bed gas reservoirs, and gradually developed the basic conditions suitable for the domestic coal-bed methane reservoirs in the emerging coal-bed methane development technologies. Horizontal wells with the goal of achieving well-connected directional drilling process, the last and most crucial aspect is the docking target, often require the application of magnetic navigation in the underground target technology, which uses magnetic principles of measurement of drill targets and target position between the and distance deviation, with a view to drilling into the target area set for the purpose to achieve connectivity.This thesis combines theory with experimentation to research magnetic field distribution of permanent magnetic materials and magnetic source. Firstly, According to the model of molecular current theoretical and magnetic dipole, that can deduce magnetic field strength calculation formula of arbitrary point outside of the space permanent magnets. And simulate the permanent magnets in different shapes by finite element method that can infer regularities of distribution of surrounding space magnetic field strength. Secondly,with the test of temperature on the magnetic influence of permanent magnet, conclude the magnets magnetic changing relationship with temperature, the result shows that magnet field strength value decrease with temperature rising, and the changing relationship of magnets magnetic and temperature is approximately B=a-bt1.69,In addition, by the test of magnetic attenuation the using the combination model of magnets and steel, and the test of environmental medium on the magnetic influence of magnetic short, draw the conclusions that attenuation characteristic of magnetic field strength with distance is related to the combination structure of permanent magnets and steel, that is to say all of the magnets and steel’s permutation degree、combination methods and Maximum magnetized ability of Permanent magnets have direct influence to the magnetic field strength value produced by this combinations model. But environmental medium on the influence of magnetic short can be neglectful. Finally,this thesis design and processed magnetic source device in line with Rotary Magnetic Ranging System technical indicators.By theoretical analysis of rotating magnetic source to the magnetic field distribution , simulate the changes of rotation of the Bx、Bz with magnetic source rotating angleβ. At the same time, it has been demonstrated by the experiment of near-bit rotating magnetic field ,the thesis can draw the conclusion that the magnetic field signal produced by near-bit rotating magnetic field is related to distance, directions. Above conclusions of the study have important practical significance on promoting the domestic research of Rotary Magnetic Ranging System.

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CLC: > Astronomy,Earth Sciences > Geology > Geology, mineral prospecting and exploration > Geophysical exploration > Magnetic prospecting > Instrument
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