Ca
sed
-ho
le L
og
gin
g
CHAT—Cased-Hole Analysis Tool
CHAT is a modular, multi-sensor measurement system capable of providing accurate data about reservoir rock parameters, fluid types, and fluid movement in and around the wellbore. Its functional modules include:
Gamma Ray-CCL: Measures natural radioactive contributions from Potassium (K), Uranium (U) and Thorium (Th). CCL reacts to current change in a magnetic field due to change in metal thickness.
Dual Energy Neutron Module: Using a Am241Be (16Ci) source and 4 neutron detectors (thermal/epithermal, near/far), the tool provides highly accurate porosity data and neutron capture cross- section ∑log to identify reservoir fluid types when the formation water salinity is known.
Behind Casing Density Module: Using a focused Cs137 gamma ray source and 3 (near, med & far) detectors, the tool provides an accurate estimation of formation Bulk Density in cased wells under favorable cementing conditions.
Production Logging Module: The production logging module includes wellbore fluid density sensor, temperature probe and other PL sensors depending on the application.
Appl ica t ions Primary porosity measurement (open-hole-
quality)
Depletion monitoring of producing reservoirs Steam flood evaluation and monitoring Production logging
Coal bed methane evaluation Problem well diagnostics - for surface casing
vent flow problems and reservoir fluids coning Reliable results can be used for optimization of
frac stages in horizontal wells
Features & Benef i ts The tool’s modular design provides versatility, efficiency and cost effective results.
The modules are designed based on the same principals as open-hole logs and can deliver comparable results.
Superior vertical resolution is attainable: 0.25m for BC Density 0.38m for ϕ and Σ
Operat ion Multiple conveyance methods are possible, including wireline, E-Coil, pipe and push down conveyance.
The tool is suitable for horizontal applications using tractors or E-Coil conveyance.
Specifications
Tool
Max. Diameter 42.9 mm [1.69”]
Max. Length 9.57m
Overall Weight 71.4 kg
Well
Max. Temperature 160⁰C (175⁰C for GR Module)
Max. Pressure 103.5 MPa [15 kpsi]
Top Related