Method for drilling azimuth measurement based on magnetic inclinometer in magnetic casing

A technology of a magnetic inclinometer and a measurement method, which is applied in the directions of surveying, earthwork drilling, wellbore/well components, etc., can solve problems such as interference of magnetic inclinometers

Active Publication Date: 2012-07-04
ZHONGBEI UNIV
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Problems solved by technology

[0003] In order to solve the problem that the magnetic field of the magnetic casing interferes with the magnetic inclinometer in the measurement of the drilling azimuth, the present invention provides a method for measuring the drilling azimuth based on the magnetic inclinometer in the magnetic casing

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  • Method for drilling azimuth measurement based on magnetic inclinometer in magnetic casing
  • Method for drilling azimuth measurement based on magnetic inclinometer in magnetic casing
  • Method for drilling azimuth measurement based on magnetic inclinometer in magnetic casing

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Embodiment Construction

[0045] A drilling azimuth measurement method based on a magnetic inclinometer in a magnetic casing, the method is realized by the following steps:

[0046] 1) Install a magnetic inclinometer referring to gravity and the geomagnetic field in the downhole magnetic casing. The magnetic inclinometer includes a three-axis accelerometer and a three-axis magnetic sensor. The three-axis accelerometer is used to measure the gravity field , the three-axis magnetic sensor is used to measure the geomagnetic field;

[0047] 2) The three-axis accelerometer in the magnetic inclinometer measures and outputs the gravitational acceleration signal received by itself;

[0048] 3) Use the signal output by the triaxial accelerometer to obtain the drilling inclination angle and tool face angle;

[0049] 4) The magnetic signal in the downhole magnetic casing is measured and output by the three-axis magnetic sensor in the magnetic inclinometer;

[0050] 5) The azimuth angle of drilling is calculated...

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Abstract

The invention relates to drilling azimuth measurement techniques, in particular to a method for drilling azimuth measurement based on a magnetic inclinometer in a magnetic casing, which solves the problem that the magnetic inclinometer is interfered by magnetic field of the magnetic casing in drilling azimuth measurement. The method includes the steps: firstly, mounting the magnetic inclinometer referring to gravity and geomagnetic field in the underground magnetic casing; secondly, using a tri-axial accelerator in the magnetic inclinometer for measurement and outputting; thirdly, obtaining drilling inclination angle and tool face angle; fourthly, using a tri-axial magnetic sensor in the magnetic inclinometer for measurement and outputting; fifthly, and obtaining drilling azimuth by calculation. The method solves the problem that the magnetic inclinometer is interfered by the magnetic field of the magnetic casing in drilling azimuth measurement, and is applicable to drilling azimuth measurement for petroleum, coal, geological exploration, mining and projects of bridges, subways and the like.

Description

technical field [0001] The invention relates to a drilling azimuth measurement technology, in particular to a drilling azimuth measurement method based on a magnetic inclinometer in a magnetic casing. Background technique [0002] In petroleum, coal, geological exploration, mining, bridge, subway and other projects, in order to control the direction of drilling and prevent accidents, it is necessary to measure the attitude angle of drilling in time. Especially for the inclined wells, directional wells, and horizontal wells in oil cluster wells and other projects, the measurement accuracy of the drilling attitude angle is required to be very high. A magnetic inclinometer consisting of an accelerometer and a magnetic sensor is a commonly used drilling inclinometer. However, the drilling casing is generally made of alloy steel, which is a ferromagnetic material, and is easily magnetized by the earth’s magnetic field. Therefore, it will interfere with the magnetic inclinometer ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B47/02
Inventor 张晓明刘俊李杰李永慧龙达峰崔星陈国彬尚剑宇黄建林刘喆蒋窍李贵珍
Owner ZHONGBEI UNIV
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