Full Waveform Sonic Logging (FWS) is a type of downhole survey that uses acoustic waves to measure the properties of the rock and fluid in the wellbore. It is a type of sonic logging, which is a method of measuring the elastic properties of rock formations by analyzing the speed and attenuation of sound waves as they travel through the rock. FWS is a more advanced version of sonic logging, which records the full waveform of the acoustic signal instead of just the amplitude, as in traditional sonic logging.
What Does Full Waveform Sonic Logging Measure?
Density
FWS can measure the density of the rock formation, which is important for determining the type of rock and the presence of fluids.
Compressional Wave Velocity
FWS can measure the speed at which compressional waves travel through the rock formation. This information can be used to determine the elastic properties of the rock, such as Young's modulus and Poisson's ratio.
Shear Wave Velocity
FWS can also measure the speed at which shear waves travel through the rock formation. This information is used to determine the rock's mechanical properties such as rigidity, strength, and failure criteria.
Lithology Identification
FWS can be used to identify the type of rock formation, which is important for reservoir characterization and exploration.
Fluid Identification
FWS can be used to identify the type of fluid present in the rock formation, such as oil, gas, or water.
Porosity And Permeability
FWS can measure the porosity and permeability of the rock formation, which are important for the production of oil and gas.
Saturation
FWS can measure the fluid saturation of the rock formation which is important for reservoir characterization and production optimization.
Stress And Strain
FWS can measure the stress and strain on the rock formation which is important for well integrity check and drilling optimization.
Fracture Detection
FWS can detect natural fractures in rock formations that can affect the flow of fluids and the production of oil and gas
What Is Full Waveform Sonic Logging Used For?
Reservoir Characterization
FWS can be used to identify the presence and orientation of hydrocarbon-bearing formations, which can help in the exploration and production of oil and gas. It can also be used to identify the type of rock formation, which is important for reservoir characterization and exploration.
Completion Design
FWS is used to design the completion string and select the appropriate size of the casing and tubing, in order to ensure a proper fit and avoid wellbore collapse or other issues.
Well Integrity Check
FWS can be used to evaluate the condition of the well and detect any signs of damage or deformation, which can cause well integrity issues. It can also measure the stress and strain on the rock formation which is important for well integrity checks and drilling optimization.
Fracture Detection
FWS can detect natural fractures in rock formations that can affect the flow of fluids and the production of oil and gas.
Production Optimization
FWS can be used to optimize drilling parameters such as weight on bit, rotary speed, mudflow, and mud properties, to improve the drilling efficiency and reduce the risk of wellbore instability.
Drilling Optimization
FWS is used to design the completion string and select the appropriate size of the casing and tubing, in order to ensure a proper fit and avoid wellbore collapse or other issues.
Mining And Geothermal Drilling
FWS can be used in mining drilling to identify the presence of mineral deposits and in geothermal drilling to identify the presence of hot water or steam.
Reservoir Monitoring
FWS can be used to monitor the changes of rock and fluid properties with time, to track the production of oil and gas and to identify the presence of changes in the reservoir that may affect the production.
