Crack effectiveness evaluation method based on sound wave remote detection and rock mechanics

Abstract

The invention discloses an out-of-well crack effectiveness evaluation method based on in-well sound wave remote detection and rock mechanics analysis, and the method comprises the steps: carrying outthe reflection wave imaging of a near-well structure in a target region through employing a sound wave remote detection imaging technology, and obtaining the trend and inclination angle of a crack; selecting a corresponding model to calculate three-dimensional crustal stress and rock internal pore pressure in combination with field actual data; determining the orientation of the maximum horizontalprincipal stress through the fast transverse wave orientation extracted by array acoustic logging; calculating a stress state on a crack plane and carrying out three-dimensional Moire circle analysis; in combination with the Moire-Coulomb fracture criterion, obtaining the critical stress state of crack opening, and judging the permeability or fluid dredging performance of cracks according to thecritical stress state. And the steps are repeated until the whole target area is treated, so as to obtain the fluid dredging performance of all underground stratum cracks in the target area. The method can be used for evaluating the effectiveness of reservoir cracks within the range of dozens of meters outside a well, and the effective application range of logging data crack evaluation is greatlywidened.

Description

technical field [0001] The invention belongs to the field of applied geophysical acoustic logging, and in particular relates to an evaluation method for the effectiveness of fractures outside wells based on acoustic wave remote detection and rock mechanics analysis. Background technique [0002] Qualitative judgment of the fluid permeability of fractures in reservoirs is of great significance to actual production, especially in tight reservoirs with fractures as the main storage space. Existing techniques use Mohr's circle in rock mechanics to analyze the imaging of formation fractures on the wellbore wall for evaluation. However, the detection depth of borehole imaging data used is shallow, and the extension of fractures outside the well cannot be determined, so there is a lack of effective evaluation methods and techniques for the fluid conductance performance of formation fractures outside the well. [0003] C.A.Barton et al. first proposed to use the three-dimensional M...

AI Technical Summary

Problems solved by technology

[0009] The purpose of the present invention is to provide a fracture effectiveness evaluation method based on acoustic wave remote detection and rock mechanics, to solve the problem of effectively evaluating the fluid conductance performance of fractures outside the well, and to provide reasonable basis for the determination of oil testing and production schemes on site. question

Images