Accurate　prediction　of　the　wellbore　temperature　is　critical　to　achieve　pressure　control　in　controlled　gradient　drilling.　In　accordance　with　the　mass,　momentum,　and　energy　conservation　principles,　an　integrated　heat　transfer　model　was　developed　for　eight　distinct　interconnected　thermal　regions　by　considering　the　coupled　heat　and　mass　transfer　of　hollow　balls,　as　well　as　the　dynamic　rock　breaking　of　the　drill　bit.　The　finite　volume　method　was　employed　to　solve　differential　equations,　and　the　dynamic　layering　method　was　employed　to　update　the　geometry　and　number　of　mesh　adjacent　to　the　moving　boundary.　The　validity　of　the　integrated　model　was　verified　using　measured　field　temperatures.　Using　this　model,　the　impacts　of　dynamically　increasing　well　depth　and　mechanical　energy　of　the　drill　bit　on　the　bottomhole　temperature　during　the　dynamic　drilling　were　compared.　Additionally,　the　variations　in　temperature　distribution　characteristics　and　heat　transfer　efficiency,　caused　by　the　heat　and　mass　transfer　of　hollow　balls,　were　investigated.　Furthermore,　a　sensitivity　analysis　of　the　temperature　characteristics　and　heat　transfer　efficiency　to　the　hollow　ball　concentration,　and　the　position　and　number　of　cyclone　separators　was　conducted.