Filtering method and device for positioning of rotating magnetic field of horizontal well

A technology of rotating magnetic field and filtering device, which is applied in the direction of buildings, etc., can solve the problems of large calculation error of single-point magnetic field positioning algorithm and inability to measure and calculate.

Inactive Publication Date: 2012-12-19
BC P INC CHINA NAT PETROLEUM CORP +1
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Problems solved by technology

However, due to the far-field model error and the influence of various noises and interferences, the far-field calculation error of the single-point magnetic field positioning algorithm is too large at a distance of 50m, and it cannot even be measured and calculated at a distance of 70m.

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  • Filtering method and device for positioning of rotating magnetic field of horizontal well
  • Filtering method and device for positioning of rotating magnetic field of horizontal well
  • Filtering method and device for positioning of rotating magnetic field of horizontal well

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Embodiment Construction

[0055] In order to make the object, technical solution and advantages of the present invention clearer, the implementation manner of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0056] Such as figure 1 As shown, the present invention provides a filtering method in horizontal well rotating magnetic field positioning, and the filtering method includes:

[0057] Step 1, set the drilling mark point of the horizontal well bit [A 0 、A 1 ,...,A n ];

[0058]Step 2, collect the magnetic field signal [S 1 , S 2 ,...,S n ];

[0059] Step three, measure each mark point according to the magnetic field signal collected in step two [A 0 、A 1 ,...,A n ] Corresponding measurement parameter [Z 0 ,Z 1 ,Z 2 ,…,Z n ]; where the measurement parameters are measured for each marked point, the specific measurement method is based on the drill bit at the measured drilling marked point A i Calculate the measured drillin...

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Abstract

The invention discloses a filtering method and a filtering method for positioning of a rotating magnetic field of a horizontal well. The filtering method comprises the following steps: setting a drilling mark point of a horizontal well drill bit; acquiring a signal of a magnetic field of the drill bit in two adjacent mark points respectively; calculating measuring parameters of each mark point based on a plurality of continuous sectional magnetic field signals formed between a measuring point An of the drill bit and each mark point; and carrying out Kalman filter calculation on the measuring parameters of each mark point so as to obtain a drill bit point measuring filter estimated value Xn; the device comprises a drilling marking module, a magnetic field signal acquiring module, a drilling measuring module and a calculating point; the Kalman filter calculation is carried to the measuring parameters of each mark point so as to achieve remote field positioning of the horizontal well, and the precision in the remote field positioning can be increased, and the effective scope of measuring and calculating of the horizontal well can be extended to the distance of more than 70m.

Description

technical field [0001] The invention relates to the technical field of horizontal well rotating magnetic field positioning, in particular to a filtering method and device in horizontal well rotating magnetic field positioning, which uses a digital signal processing method to optimize the horizontal well rotating magnetic field positioning results. Background technique [0002] Magnetic field positioning technology is widely used in steerable drilling. By using the change of magnet's magnetic moment direction and distance, it will form a specific magnetic field distribution in space. By detecting the change of specific magnetic field parameters, the position of the magnet in space can be measured. change, and determine the relative position of the observation point and the magnet in space. Horizontal well rotating magnetic field positioning is under strict near-field magnetic field model, which has precise near-field positioning accuracy. [0003] At present, the Drilling In...

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Application Information

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Patent Type & AuthorityApplications(China)
IPC IPC(8): E21B47/092E21B47/13
Inventor申瑞臣张超田中兰乔磊庞柯柯董胜伟
OwnerBC P INC CHINA NAT PETROLEUM CORP