Study of wellbore heat transfer considering fluid rheological effects in deep well acidizing.

Real-time understanding of the wellbore temperature is a prerequisite for the acidizing treatment design. Fluid flow regime variation caused by fluid rheological property has a great influence on wellbore temperature distribution. According to the physical situation in the acidizing process, the wellbore and formation heat transfer model considering fluid rheological effects is established, the validity of the model is verified by comparing with monitoring data and previous research results. The results indicate that fluid rheology will cause the transition of flow regime, which leads to the variation of heat transfer efficiency. Considering wellbore original water is benefit for accurately predicting bottom-hole temperature. Injection rate has a great influence on fluid flow regime. A critical injection rate with the highest cooling efficiency exists in the low range of pumping rate condition. The findings above can provide theoretical insights for the deep well acidizing, and the model built in this paper is applied in field wellbore temperature simulation. • A numerical wellbore temperature model considering fluid rheological effects was established. • A comprehensive method was provided to build non-Newtonian fluid rheological correlation. • Injection rate had a great influence on fluid rheology and wellbore temperature distribution. [ABSTRACT FROM AUTHOR]