Schlumberger

SonicScope Multipole Sonic-While-Drilling Service

Real-time accuracy with LWD multipole acoustics

The SonicScope service combines high-quality monopole and quadrupole measurements to deliver robust compressional and shear slownesses—along with Stoneley data—in a wide range of applications, regardless of mud slowness. By acquiring all modes without affecting logging speed, the SonicScope service performs while-tripping, fast-logging multimode for multipass analysis and top-of-cement evaluation.

 

Mitigate risk in complex exploration environments

With reliable compressional and shear measurements to estimate pore pressure as well as fracture gradients, drillers have the ability to estimate a safe mud window and make critical recommendations for mud adjustment and casing point selection.

Increase reservoir understanding with quantitative formation data

In geological and geophysical applications, the SonicScope service provides quantitative information on the amount of connected porosity without using radioactive sources. This is particularly advantageous in carbonate reservoirs because the SonicScope service responds only to interconnected porosity. Additionally, the continuous compressional and shear data enable assessment of rock mechanics, fracture identification, and gas saturation.

Quantitative bond index enables cement evaluation

The cement evaluation component of the SonicScope service was developed to address the industry’s need for well integrity assessment while reducing well construction costs. ‭The two parts of the SonicScope service, cement detection and cement bond evaluation, enable rapid assessment of the cementing operation outcome and increase confidence before drilling out the shoe. During cement evaluation, the SonicScope service uses both the amplitude of the casing arrival and its attenuation rate to derive a cement bond index information about the percentage of bonding between casing and cement. The cement bond index is stored in memory, and the top of cement identification data can either be relayed in real time or stored for later reference.‬‬

Completions strategy enhancement maximizes production

The multipole capability of the SonicScope service provides data for various applications to enhance the completions strategy. Continuous data from compressional and shear waves can be used for rock mechanic analysis and can assist in optimizing multistage fracturing for proper completion. A dedicated module for Stoneley wave acquisition while drilling enables formation fracture characterization before any washout can develop.

Avoid hazards with proactive well placement

The SonicScope service's robust real-time compressional data can be used to build a seismogram and place the bit on the surface seismic, enabling identification of targets and hazards ahead of the bit. This application enables drillers to make critical decisions about steering, landing, and stopping the well.

Enhance completions strategy for maximized production

The multipole capability of the SonicScope service provides data for various applications to enhance the completion strategy, from inputs to evaluate zonal isolation to multistage fracturing. The fast-logging multimode service identifies the top of cement with consistency and repeatability while tripping (before drilling open hole or while pulling out).

 
 
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LWD Sonic Data Supports Critical Geomechanic Analysis in Deepwater HPHT Well

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Operator obtained reliable LWD sonic data for both real time and memory to reach total depth with reduced risk in South China Sea project.
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