深水钻探井筒温度场计算与分析

he temperature distribution with depth of Nanhai is obtained by regression analysis. And the temperature field in wellbore during circulation or non-circulation terms in deepwater drilling are established based on the thermodynamics theory. Calculation results indicate that the insulating layer should be undamaged and large delivery capacity should be used for maintaining the temperature under circulation condition. When the pumps stop, the temperature in wellbore will be closing to the extraneous temperature with time. Time of shut in state must be short to prevent form hydrates in wellbore and blowout preventer.