Calculation method for underground magnetic navigation

A calculation method and magnetic navigation technology, applied in the field of navigation calculation, can solve the problems of small number of wells and low output of single coalbed methane well, and achieve the effects of long navigation distance, convenient computer programming and simple calculation method

Inactive Publication Date: 2011-03-02
NANCHANG HANGKONG UNIVERSITY
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Problems solved by technology

At present, the single well production of coalbed methane is low and the number of wells is small

Method used

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  • Calculation method for underground magnetic navigation
  • Calculation method for underground magnetic navigation
  • Calculation method for underground magnetic navigation

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Experimental program
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Embodiment Construction

[0016] The present invention is achieved like this:

[0017] Step 1, the underground magnetic navigation method preprocesses the collected magnetic signals: FIR digital filtering is performed on the original magnetic signals collected by the magnetic vector sensor to filter out the geomagnetic signals and noise contained in the signal, because the noise signals are generally high Therefore, let the signal pass through a low-pass filter to filter the high-frequency noise first, and then perform FIR digital filtering on the signal. After filtering out the geomagnetic signal, the magnetic signal generated by the permanent magnet joint can be obtained;

[0018] Step 2, establish a magnetic dipole model on the basis of the two basic laws of Ampere's molecular circulation hypothesis and Biot-Savart's law, and establish a calculation model for the induced magnetic field intensity generated by a magnetic source at any point in space; as figure 1 As shown, when calculating the induced ...

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Abstract

The invention discloses a calculation method for underground magnetic navigation, comprising the following steps: step 1, preprocessing acquired magnetic signals by an underground magnetic navigation method; step 2, establishing a model for calculating the strength of induced magnetic fields generated at any point in space by a magnetic source; step 3, starting from a magnetic dipole model; step 4, solving the undetermined coefficient in a relational expression shown in the specification by adopting the least square linear fitting method; step 5, adopting the model established in step 3 to solve the relation among an azimuth, a hole deviation angle and the strengths of magnetic inductions generated by the magnetic source at any point in space in the directions of x, y and z through back calculation; step 6, adopting three pairs of magnetic field strengths in the directions of x, y and z acquired by three fluxgate type sensors; and step 7, judging the position of the magnetic source relative to a magnetic vector sensor. The method has the advantages of adopted artificial magnetic beacon, long navigation distance and high angle measurement precision. The calculation method is simple, can be programmed conveniently by a computer, and has high operation efficiency.

Description

technical field [0001] The invention relates to a calculation method for navigation, in particular to a calculation method for underground magnetic navigation. Background technique [0002] my country's coalbed methane reserves are abundant, the social demand and growth are huge, and the utilization prospects are broad. At present, the single well production of CBM is low and the number of wells is small. The current development attempts show that in the future, a model will be formed in which multi-branch horizontal wells will be the mainstay and vertical wells will be the supplementary. However, my country's multi-branch horizontal well technology basically relies on foreign companies. The domestic drilling technology is not matched, and special tools and equipment are lacking. The large-scale development is severely restricted. The key problem is how to realize the main branch of the horizontal well and the vertical well. The development of an underground magnetic naviga...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01C21/20
Inventor 程强强胡博
Owner NANCHANG HANGKONG UNIVERSITY
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