Unlock instant, AI-driven research and patent intelligence for your innovation.

Method for detecting, locating, and characterizing single and multiple fluid-filled fractures in fractured formations

a fracture formation and fluid-filled technology, applied in the field of oil and gas exploration, can solve the problems that existing commercial bhtv and fms techniques do not give a quantitative measure of fracture apertur

Inactive Publication Date: 2005-04-05
SOUTHWEST RES INST
View PDF2 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The invention described is a dipole sonic method using new attributes observed in the full waveform acoustic signatures for detecting, locating and characterizing single or multiple fractures in a reservoir formation. The attributes are the dual flexure waves and the leaky fracture mode. These attributes are excited by a dipole source in a fluid-filled borehole near or intersected by parallel, fluid-filled

Problems solved by technology

Existing commercial BHTV and FMS techniques do not give a quantitative measure of fracture aperture.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

The invention described is a method applied to fractured reservoirs to detect, locate and characterize vertical or near vertical fluid-filled fractures. The method is based on an analysis of full waveform dipole sonic signatures recorded at different dipole orientations in a fluid-filled borehole. The method uses new attributes that describe the presence, location, orientation and relative aperture of a fluid-filled fracture intersecting or near the borehole. The attributes are the dual flexure waves and the leaky fracture mode excited by a dipole source in a fluid-filled borehole close to or intersected by a fracture parallel to the axis of the well. The dual flexure wave attribute is characterized by two distinct guided wave modes that replace the borehole flexural mode excited in the absence of the fracture. The first mode of this attribute is shifted to a lower frequency, and has smaller amplitude and a significantly faster group velocity than the borehole flexural mode excited ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

A method to analyze full waveform multiple (i.e., monopoles, dipoles, quadrupoles) acoustic measurements in a fluid-filled borehole, surrounded by a system of fractures oriented parallel to the axis of the borehole. The method uses new measurement attributes, herein referred to as dual flexure waves and leaky fracture mode.

Description

TECHNICAL FIELD OF THE INVENTIONThis invention relates to methods of oil and gas exploration, and more particularly to detection, location, and characterization of fluid-filled fractures using acoustic measurements.BACKGROUND OF THE INVENTIONTo better understand the influence of fractures on oil and gas production, a core analysis and a detailed logging program are usually required. The general objectives of such a program are first to identify fractures, second to orient the fractures, and third to predict their influence on the production of individual wells. To accomplish this detection and characterization of fractures in reservoirs, two logging measurement techniques are used to image the subsurface surrounding the borehole. These are the formation micro scanner (FMS) and the borehole televiewer (BHTV). Existing commercial BHTV and FMS techniques do not give a quantitative measure of fracture aperture. Fracture orientation is readily obtained for inclined fractures with either ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): G01V1/44G01V1/40
CPCG01V1/44
Inventor PARRA, JORGE OCTAVIOXU, PEI-CHENG
Owner SOUTHWEST RES INST