Numerical study of temperature–pressure coupling model for the horizontal well with a slim hole

Abstract Horizontal wells with a slim hole (HW‐SH), characterized by high productivity, environmental protection, and low cost are gradually being introduced into oil gas extraction processes in high‐temperature high‐pressure formations. However, the HW‐SH annulus is narrow, distributions of temperature pressure wellbore very different from those conventional horizontal wells. Furthermore, mud properties change under influence pressure. In this study, numerical model transient temperature‐pressure coupling field an was developed based on performance tests mud, combined characteristics narrow HW‐SH. Subsequently, effects ground gradient, displacement, drill pipe speed, size, joint size were analyzed. Measured data drilled Mahu China used to validate model. The results showed that had significant effect density rheological properties. As increased, decreased, its improved. Although also has large density, it negligible mud. coupled for considering can predict accuracy up 97%. gradient greatest annular temperature, larger than displacement. addition, rotation speed pipe, have almost no temperature. Compared wells, rotational greater impact