Underground magnetic navigation method

A magnetic navigation and magnetic vector technology, applied in the field of magnetic navigation, can solve the problems of low coalbed methane single well production and small number of wells, and achieve the effect of simple structure and convenient use

Inactive Publication Date: 2011-02-23
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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  • Underground magnetic navigation method
  • Underground magnetic navigation method

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Embodiment Construction

[0009] First, put the permanent magnet sub-joint and the magnetic vector sensor installed together with the drill bit into two vertical wells with a depth of 1500m, and the distance between the two vertical wells is 100m, so that the center of the permanent magnet sub-joint and the magnetic vector sensor are on a straight line, such as The dotted line in the figure shows the normal trajectory of directional drilling. The navigation system starts to work when the drill collar is drilled about 50m away from the target well, and the navigation drill collar can accurately drill into the target area. The maximum operating temperature of this navigation system is 125 degrees Celsius. The permanent magnet nipple is not only a part of the drill collar, but also the magnetic source of the navigation system. The magnetic sub is usually placed on the drill collar closest to the drill bit, so it can be approximated that the center of the permanent magnetic sub is the position of the dril...

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Abstract

The invention discloses an underground magnetic navigation method. The method is characterized by comprising the following steps of: fixedly connecting a permanent magnet short joint with a drill bit; placing the permanent magnet short joint and a magnetic vector sensor into two vertical wells respectively; keeping the center of the permanent magnet short joint and the center of the magnetic vector sensor on the same straight line; continuously transmitting a stable magnetic signal by the permanent magnet short joint connected with the drill bit during the drilling of the drill bit; acquiring the magnetic signal transmitted by the permanent magnet short joint by the magnetic vector sensor; transmitting the signal to an over-ground computer by using a cable; analytically measuring the distance and the angle of the drill bit by the computer by using the acquired magnetic signal; calculating and determining the position of the drill bit in the well; transmitting information on the distance, azimuth, well deviation angle, and direction and position deviated from a normal track to the drill bit if the drill bit deflects at a moment; and righting the position of the drill bit to gradually return the drill bit to the normal track. The method has the advantages that: the structure is simple, the method is convenient to use, and an effective high-technology navigation technical means is provided for the communication of two wells.

Description

technical field [0001] The invention relates to a magnetic navigation method, in particular to an underground magnetic navigation method. 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. Domestic drilling technology is not matched, special tools and equipment are scarce, and large-scale development is severely restricted. The key problem is how to realize the connection between the main branch of the horizontal well and the vertical well. The development of an underground magnetic navigation sy...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/30E21B47/12E21B47/02E21B7/00E21B47/00E21B47/09E21B47/013E21B47/092
Inventor 程强强胡博
Owner NANCHANG HANGKONG UNIVERSITY
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