Post-fracturing monitoring is a vital tool for fracturing effect evaluation and fracturing design optimization. Our company has developed a quantum dot tracing monitoring technology that can assess the fracturing effect after fracturing. Currently, the patent for this product has been granted: A quantum tracing device and completion pipe for oil and gas wells. Quantum dots are artificially synthesized semiconductor fluorescent nanocrystals that have excellent photoluminescence, water solubility, low cost, high detection accuracy, wide sources and other benefits. They have been applied in the field with remarkable results and have promising application prospects in shale horizontal wells.

Detailed Parameters：

The collected fuid samples are chromatography tested after simple impurity removal. Upon passing through the laser, diferentcoded ouantum dots will emit diferent wavelenaths of liht which will be captured by the instrument and sent for analysis. From theresult. diferent snectral features can be distinauished as diferent tvpes of auantum dots and their concentration: converted into thecorresponding percentages of filuids from different well segments.

Applications：

The adsorption situation of quantum dots QDs-1~QDs-5 after contacting shale at different formation retention times and temperatures is recorded, and the fluorescence intensity retention rate is recorded to plot the following adsorption curve of quantum dots.