MGT offers numerical modelling services in the area of the geophysical characterisation of nuclear borehole tools

There is a strong industrial need to numerically simulate “true” borehole conditions and to synthesize the response of nuclear well logging tools. Such modelling capabilities have not been widely available for nuclear well logging. In order to achieve the “true” response it requires taking into account the specific design of a nuclear tool and to numerically copy the borehole environment. We use a Monte Carlo code to simulate the response of nuclear tools with consistent source sensor configurations. This technique is widely employed in nuclear tool modelling for the water industry and in oil well logging applications to help understand fundamental nuclear physics, interpret nuclear logs, design and optimize nuclear logging tools.

ADVANTAGES OF NUMERICAL MODELLING OF NUCLEAR BOREHOLE TOOLS

• Reveals environmental effects (borehole diameter, mudcake, casing)
• Avoids time consuming experimental calibration measurements
• Provides a cost effective method to create correction charts without utilisation of experimental test facilities
• Enables optimization of tool design and prediction of performance
• Allows one-to-one simulation of complex tool geometries

DENSITY AND LITHOLOGY LOGGING (PHOTOELECTRIC ABSORPTION)

• Modelling of rate response of multi source and detector systems
• Prediction of formation density and porosity
• Development of correction charts for any tool geometry
• Development of mud correction charts (“spine and rib”)
• Simulation of photoelectric absorption and lithology determination
• Resolution analysis

NEUTRON LOGGING TOOL (Neutron-Neutron and Neutron-Gamma)

• Modelling of rate response of single and multi-detector systems
• Estimation of formation parameters
• Estimation of thermal neutron absorption cross section
• Correction charts (borehole diameter, cased hole effects)
• Estimation of major environmental perturbations of neutron porosity
• Resolution analysis and optimisation of source-detector spacing, depth of investigation

PULSED NEUTRON LOGGING TOOL

• Rate response of thermal neutron capture
• Pulsed neutron spectroscopy
• Pulsed neutron porosity