Experimental Study on Temperature Response and Quantitative Relationship with Injection Profile in Water Injection Wells Based on Distributed Temperature Sensing
DOI:
https://doi.org/10.15377/2409-787X.2026.13.4Keywords:
Water injection well, Enhanced oil recovery (EOR), Injection profile interpretation, Wellbore temperature distribution, Distributed temperature sensing (DTS)Abstract
Currently, the understanding of temperature profile responses in water injection wells remains insufficient, making it challenging to interpret water injection profiles using distributed temperature sensing (DTS) data and to perform quantitative diagnosis of downhole injection performance. In this study, a physical simulation experiment was conducted to investigate the effects of injection rate, injection time, injection temperature, and injection position on the temperature profile of horizontal wells. The results indicate that as the injection rate increases, the wellbore temperature profile decreases, and the temperature rise from the heel to the toe becomes less pronounced. The temperature drop corresponding to the water-injection intervals exhibits a linear positive correlation with the injection rate, and a quantitative relationship between temperature change (ΔT) and injection rate was established through regression analysis. Injection temperature significantly enhances the temperature field; higher injection temperatures lead to more substantial overall temperature increases along the profile. The injection position determines the fundamental shape of the temperature profile. Regardless of whether injection is applied at the heel, toe, middle section, or both ends, distinct temperature anomalies are observed around the water-injection locations. Based on this characteristic, water-injection positions can be identified from field DTS data, thereby providing a basis for quantitative evaluation of water injection profiles.
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