Our slim, harsh environment tool strings allow clients to obtain data with minimal impact on the flow. Applications include flow profiling, water or gas entry detection, leak detection and Selective Inflow Performance (SIP) to determine current formation pressure and permeability.

Scientific Drilling‘s Flow Logging System (FLS) is a compact modular design, which can be run on memory or in real-time. Standard Sensors include Casing Collar Locator, Gamma Ray, Pressure, Temperature, Spinner Flowmeter, Capacitance and Fluid Density.

Standard FLS (1.375)

Scientific Drilling‘s Flow Logging System (FLS) provides a high quality and cost-effective solution to find leaks, define the well flow profile and fluid type with a slim tool string. The compact and modular system can be run in memory mode – MPLT – or real-time – SRO PLT – for continuous memory surface recording. In-house tool development has made memory data acquisition possible for durations in excess of 10 days.


Scientific Drilling’s SlimFlow (production logging system) is designed to access wells with restrictions and go where other tools cannot to obtain valuable data for the customer. This system hosts a variety of sensors for memory and real-time data acquisition in a tool-string configuration that does not exceed 1.5″ diameter.

Vulcan™ FLS (1.44)

Scientific Drilling‘s Vulcan™ FLS 1.44 Flow Logging System (FLS) is the slimmest, flasked, full function memory based production logging tool in the industry.  This high temperature system offers a full range of sensors, including Casing Collar Locator, Gamma Ray, Pressure, Temperature, Spinner Flowmeter, Fluid Capacitance, Nuclear Fluid Density, and Tuning Fork Density. The service is fit for the purpose of HPHT oil and gas well logging, and able to withstand temperatures of up to 600°F (315°C) for limited durations.

Vulcan™ FLS (1.75, 2.25)

Scientific Drilling‘s Vulcan™ FLS 1.75 and Vulcan™ FLS 2.25 Flow Logging Systems (FLS) are extended-duration, flasked flow logging tools.  Both are available in Memory and Surface Readout modes. These high temperature systems offers a similar suit of sensors to the Vulcan FLS 1.44. The main use of this larger format tool string is to achieve a longer duration in very hot wells. The service is ideal for geothermal wells, or gas wells where a longer period of time in the well is required. They are capable of operating at up to 600°F (315°C).