This　article　considers　the　rheology　and　convective　heat　transfer　characteristics　of　borate　cross-linked　guar　and　borate　cross-linked　foam　fracturing　fluid　by　conducting　experiments　on　a　large-scale　test　loop　at　30　MPa.　The　results　show　that　severe　chemical　degradation　of　borate　cross-linked　guar　occurred　as　temperature　increased.　When　temperature　was　higher　than　the　threshold　value,　the　cross-linker　was　almost　disabled　and　the　guar　was　no　longer　cross-linked.　It　was　also　found　that　the　viscosity　of　borate-cross-linked　foam　fracturing　fluid　was　proportional　to　the　increment　of　foam　quality,　which　was　inversely　proportional　to　the　increase　of　temperature.　The　influence　of　fluid　behavior　index　on　the　velocity　gradient　of　non-Newtonian　fluid　at　the　wall　is　tremendous,　resulting　in　a　negative　temperature-dependent　convective　heat　transfer　coefficient.　Moreover,　to　calculate　the　convective　heat　transfer　coefficients　of　these　two　fluids　and　also　to　match　the　experimental　data,　a　multiplier　should　be　utilized　to　account　for　the　shear-dependent　thermal　conductivity　and　heat　transfer　enhancement.　The　contribution　of　shear-induced　bubble-scale　microconvection　was　significant　for　the　heat　transfer　enhancement　of　foam　fluid.　The　correlations　between　the　viscosity　and　the　convective　heat　transfer　coefficient　of　borate　cross-linked　guar　and　borate　cross-linked　foam　fracturing　fluid　deduced　from　the　experimental　data　were　also　obtained.