In-Situ Diagnostics of Multi-Thermal Fluid Injection Parameters Using Stray Radiation Suppression and Circular...

Area of Science:

• Chemical Engineering
• Spectroscopy
• Petroleum Engineering

Background:

• Multithermal fluid (MTF) injection parameters are crucial for offshore heavy oil development.
• Accurate monitoring of gas-water ratio (GWR) and noncondensable gases proportion (NCGP) is essential for optimizing injection, predicting productivity, and improving generator combustion.

Purpose of the Study:

• To implement simultaneous in situ diagnostics of GWR and NCGP in a pilot-scale MTF environment.
• To develop and validate a novel laser absorption spectroscopy multigas sensor system for MTF injection parameter monitoring.

Main Methods:

• Integration of a novel laser absorption spectroscopy multigas sensor system with stray radiation suppression and circular cell enhancement.
• Design of a structurally optimized extinction thread to reduce high-temperature radiation interference.
• Experimental testing in a laboratory-scale MTF generation system using diesel fuel.

Main Results:

• Achieved a 3.42-fold improvement in absorbance signal-to-noise ratio (SNR).
• Maintained measurement uncertainties for H2O/CO2 concentrations at ±6.34% and ±6.87%, respectively.
• Observed CO2 proportion comparable to field data, but higher simulated GWR compared to field parameters.

Conclusions:

• The developed system provides stable and rapid in situ diagnostics of MTF injection parameters.
• This represents the first reported laboratory bench test for in situ diagnostics of MTF injection parameters.
• The findings are significant for advancing monitoring and optimization in heavy oil development.