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Method and device for calculating microseismic azimuth in wells based on porous multilevel

A calculation method and microseismic technology, applied in design optimization/simulation, special data processing applications, etc., can solve the problem of unstable geophone, uneven signal-to-noise ratio of perforation data, and influence on the accuracy of microseismic azimuth calculation in wells degree and other issues, to achieve the effect of accurate azimuth angle

Active Publication Date: 2020-12-01
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The inventor found that due to the complexity of the actual data collected in the field, the signal-to-noise ratio of the perforation data is uneven, and some geophones will be unstable under long-term high temperature, which affects the accuracy of microseismic azimuth calculation in the well

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  • Method and device for calculating microseismic azimuth in wells based on porous multilevel
  • Method and device for calculating microseismic azimuth in wells based on porous multilevel
  • Method and device for calculating microseismic azimuth in wells based on porous multilevel

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Embodiment 1

[0025] figure 1 A flow chart of a method for calculating a microseismic azimuth in a well according to an embodiment of the present invention is shown. The method can include:

[0026] Step 101, calculate the radial directions of all perforations based on the known perforation coordinates and geophone coordinates, and use one of the perforation radials as the reference radial to calculate the angles between all other perforation radials and the reference radial θ={θ 1 ,θ 2 ,...,θ N}, where N is the number of perforations, θ 1 ,θ 2 ,...,θ N are the angles between perforations 1, 2, ..., N and the radial direction of the reference perforation;

[0027] Step 102, using the included angle to correct the azimuth consistency of the perforation data so that the radial direction of all perforations is consistent with the reference radial direction;

[0028] Step 103, multiple perforation data that have been corrected for the consistency of azimuth perforation data are superimpo...

Embodiment 2

[0062] According to another embodiment of the present invention, a microseismic azimuth calculation device in a well is provided. The device may include: a perforation radial calculation unit, which is used to calculate all perforation radial directions based on known perforation coordinates and geophone coordinates, and use one of the perforation radial directions as a reference radial to calculate all other perforation radial directions and their intervening Angle θ={θ 1 ,θ 2 ,...,θ N}, where N is the number of perforations, θ 1 ,θ 2 ,...,θ N are the included angles between perforations 1, 2, ..., N and the radial direction of the reference perforation; the perforation data azimuth consistency correction unit is used to correct the perforation data azimuth consistency for the perforation data by using the angle, so that The radial direction of all perforations is consistent with the reference radial direction; the multi-hole two-dimensional covariance matrix constructio...

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Abstract

The invention discloses an in-well microseism azimuth calculation method and device based on multiple holes and multiple stages. The method can comprise the following steps: based on a known perforated hole coordinate and a detector coordinate, calculating all perforated hole radial directions; by taking one perforated hole radial direction as a reference radial direction, calculating included angles theta, equal to {theta1, theta2, . . . , thetaN}, formed by all the other perforated hole radial directions and the reference radial direction; performing perforated hole data azimuth consistency correction on perforated hole data, so that all the perforated hole radial directions are consistent with the reference radial direction; serially connecting and stacking multi-hole data, and establishing a multi-hole two-dimensional covariance matrix CXY; calculating azimuth angles alpha, equal to {alpha1, alpha2, . . . , alphaM}, of all the detectors; performing detector azimuth consistency correction on fracturing data, so that an X component of disordered fracturing data is rotated to the perforated hole radial direction; serially connecting and stacking multiple stages of detectors, and establishing a multi-stage detector two-dimensional covariance matrix DXY; calculating a fracturing event azimuth angle beta. The multiple perforated holes and the multiple detectors are equivalent to one perforated hole and one detector, thus realizing accurate and stable calculation of the fracturing event azimuth angle.

Description

technical field [0001] The present invention relates to the field of seismic monitoring, and more specifically, to a method for calculating micro-seismic azimuth in a well based on multi-holes and a device for calculating micro-seismic azimuths in a well based on multi-holes. Background technique [0002] Well microseismic monitoring is one of the microseismic observation methods. According to the needs of microseismic monitoring, it carries out fracturing of the well, designs multiple perforation positions for fracturing tests, and uses the downhole three-component geophone to receive the microseismic full wave field signal. Compared with surface microseismic monitoring, the data received in the well has a higher signal-to-noise ratio, and the number and types of microseismic events are more abundant. The disadvantage of microseismic monitoring in wells is that the location of downhole geophones is unknown, which leads to disordered X-component and Y-component microseismic...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F30/20
CPCG06F30/20
Inventor 余波
Owner CHINA PETROLEUM & CHEM CORP
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