Techlog Acoustics

Supporting a wide range of wireline and LWD sonic tools to enable users to load, view, and quality control sonic data.

Overview

Sonic data measurements are vital for well evaluation and interpretation tasks in domains such as geophysics, petrophysics, geomechanics, and drilling. In turn, data quality control and validation are critical for these applications.

The Techlog Acoustics module provides all the functionalities required to load, analyze, and quality control data from all the major service companies for both wireline and logging-while-drilling tools. With the Delta-T and Anisotropy workflows in Techlog wellbore software, processing of the sonic waveforms produces results you can rely on.

Evaluation of formation type and associated mechanical properties.

Interactive quality control of initial waveforms.

Stoneley fracture analysis.

Stoneley mobility analysis.

Applications

Go beyond basics with SLB sonic data

For SLB sonic tools, the Acoustics Interpretation Suite is available to go beyond the industry basics for sonic analysis. Quantitative formation permeability in conventional or fractured reservoirs, near-wellbore alteration or damage, best-in-class cased hole evaluation, and far-field slownesses in large or extreme borehole conditions are key benefits of this new software technology.

Prepare your sonic data for processing

The workflow starts with the preparation of acquired sonic data for all subsequent processing. This step ensures that all tool-specific preprocessing (e.g., gain normalization, DC-offset filtering, and start-time channels) is conducted and that the depth reference for each tool is honored before starting the quality control of the data.

Techlog wellbore software provides different ways to display and interact with acoustic data, such as waveforms and slowness time projection, along with other relevant data such as gamma ray, calipers, and wellbore images. Specialized tools for quality control investigation of sonic arrays such as waveform plots, spectrum plots, and dispersion analysis plots are available. The caliper data can also be viewed in borehole section plots to help analyze the borehole shape and the tool eccentricity inside it.

Radial profiling for monopole, dipole and Stoneley.

Benefits

Fully benefit from your sonic data

The Techlog Slowness Time Coherence (STC) module comprehensively extracts formation slownesses from sonic waveforms. The processing can be conducted efficiently with default parameters adapted to each tool and environment when possible. For more challenging sonic data, advanced features are available for receiver disabling, transmitter mode, and interactive parameters in single depth for different formation types. For some SLB tools, dispersive STC can be conducted for dipole data, Stoneley, and leaky P.

The Delta-T wizard provides guided workflows, enabling users to build the full workflow and adapt their parameters interactively depending on their inputs and on the environment that has been logged (e.g., slow or fast formation).

Perform anisotropy analysis from sonic data

Anisotropy analysis from cross-dipole array waveforms can be performed efficiently using Techlog Four-Component Rotation. This module is biased on the generalized four-component rotation (Alford rotation) technique to determine the direction of fast shear slowness. Waveform filtering, time windows selection, and statistical averaging are also incorporated to enhance the processing and guide the users to extract all the QC outputs that go with this analysis.

Features