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OIHPT
Optical Image Profiler with
Hydraulic Profiling Tool

How OIHPT works

Tap the log chart to see what it shows.Hover over the log chart to see what it shows.

When to use OIHPT

  • Light NAPL (LNAPL) delineation and extent mapping
  • Petroleum release investigations (USTs, pipelines, refineries)
  • Soil permeability and lithology profiling
  • Identification of preferential migration pathways
  • Source-zone characterization
  • NAPL assessment before and after remediation

See the tool comparison if your objective is not here.

About HRSC

How OIHPT works

OIHPT’s sapphire window stays in contact with the formation as it advances, and a camera behind it photographs the soil under UV light. Clean soil stays dark. Free-phase product (non-aqueous phase liquid, or NAPL) fluoresces.

  • Camera view
A line drawing of the OIHPT tool, measured from its photograph, moving down in a loop through a bed of clean soil and then a bed of NAPL. The sapphire window in the side of the tool is in contact with the ground and carries a faint blue tint for its UV light. Beside the window, a camera view shows real ultraviolet frames from one OIHPT log, with the percent area of fluorescence that log recorded under each. In clean soil the frame is black and the reading is 0. The NAPL bed is drawn darker where the log read higher, and through it the camera view shows 9 frames of fluorescing product, reading 2, then 61, then 43.2, then 20.9, then 6.7, then 24.7, then 8.3, then 32.7, then 14.9, before the frame goes black again.

At the window

What OIHPT sees

OIHPT shines light through a sapphire window. Free-phase product in the soil fluoresces, and the log records how much of the window it lights.

OIHPT variant

Sapphire window

Light
Light

The soil at the camera window under UV light. Petroleum fluoresces; clean soil stays dark.

The soil at the camera window under white light, captured on demand and at rod changes.

The soil at the camera window under green laser light. Heavy product fluoresces orange to red, and a filter keeps the green out.

The soil at the camera window under infrared light, captured on demand and at rod changes.

Depth
Depth

Area of fluorescence

The share of the camera window where free-phase product (NAPL) fluoresces.

The OIHPT tool, and the view through its sapphire window at four depths of one push for each of two variants: OIHPT-UV under UV and white light, and OIHPT-G under green and infrared light, with the fluorescence the log recorded at each depth in % AF.

Three variants, one platform

Each variant targets a different kind of NAPL. All share the same HPT and EC sensors.

OIHPT variant
Excitation
275 nm UV LED (~3 mW output)
Fluorescence method
Lamp-Induced Fluorescence (LIF)
Target compounds
Common petroleum NAPL: gasoline, diesel, jet fuel, motor oil, hydraulic oil, No. 2 fuel oil
Best for
Gas stations, fuel terminals, pipeline releases, petroleum bulk storage facilities
Excitation
520 nm green laser diode
Fluorescence method
Laser-Induced Fluorescence (LIF)
Target compounds
Heavy NAPL: creosote, coal tar, heavy crude oil, bunker fuels
Best for
Manufactured gas plants, wood treating facilities, coal tar sites, heavy crude releases
Excitation
275 nm UV LED
Fluorescence method
Lamp-Induced Fluorescence (LIF)
Target compounds
Lighter-end NAPL: BTEX, kerosene, jet fuel (fluoresces in the UV spectrum)
Best for
Airfields, military bases, jet fuel release sites

Contact us about availability, pricing, and which OIHPT variant fits your site.

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