A Fracture Effectiveness Evaluation Method Based on Acoustic Remote Detection and Rock Mechanics

Abstract

The invention discloses a method for evaluating the effectiveness of out-of-well fractures based on sound wave remote detection in wells and rock mechanics analysis, comprising: using acoustic wave remote detection imaging technology to perform reflected wave imaging on wellside structures in the target area to obtain the direction and inclination angle of fractures and other occurrence information; combined with the actual data on the spot, select the corresponding model to calculate the three-dimensional in-situ stress and pore pressure inside the rock; determine the maximum horizontal principal stress azimuth through the fast shear wave azimuth extracted by array acoustic logging; calculate the stress state on the fracture plane The three-dimensional Mohr circle analysis is carried out; combined with the Mohr-Coulomb rupture criterion, the critical stress state for crack opening is obtained and used to judge the permeability or fluid conductance performance of the fracture. The steps are repeated until the entire target area is processed, and the fluid conductance performance of all formation fractures outside the well in the target area is obtained. The invention can be used for the effectiveness evaluation of reservoir fractures in the range of tens of meters outside the well, and greatly improves the effective application range of the fracture evaluation of well logging data.

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...

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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

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