Method and system for detecting the geometry of underground fractures

摘要

A method for detecting the geometry of underground fractures comprising:
introducing a filling material (14) into an underground fracture (11) to form a pack of filling material (14);transmitting an electromagnetic field into the fracture (11);detecting at least one reflected signal of the electromagnetic field transmitted; andprocessing the at least one detected signal to reconstruct the geometric and dimensional characteristics of the pack of filling material (14);wherein the electromagnetic field transmitted into the fracture (11) has a frequency comprised in the range of between 30 megahertz and 250 megahertz and in that said filling material is not added with any additives;and a system for implementing the aforementioned method.

主权项

1. A method for detecting a geometry of underground fractures, comprising:
a) introducing a filling material into an underground fracture to form a pack of filling material; b) transmitting an electromagnetic field into said fracture; c) detecting at least one reflected signal of said transmitted electromagnetic field; and d) processing said at least one detected signal to reconstruct geometric and dimensional characteristics of said pack of filling material, wherein said electromagnetic field transmitted into said fracture has a frequency in a range of from 30 megahertz to 250 megahertz and wherein said electromagnetic field is emitted with a parallel polarization with respect to the linear extension of the end part of said fracture, said end part of said fracture behaving like a corner reflector, said filling material comprising a proppant and a fracturing liquid or a hydrocarbon, but without any further additive for improving transmission or reflection of an electromagnetic wave.