钻井液的性质显著地影响着流体的静压力、摩擦压力损失和热量的传递。在中等和较浅水深的垂直井中 ,钻井液性质对温度的和压力的影响常常很小 ,这是因为在井中不同部位和不同方向 ,随着温度不断变化 ,温度和压力的影响可以局部相互抵消。但在大位移井中 ,当钻井液沿钻杆向下流 The nature of the drilling fluid significantly affects the hydrostatic pressure, friction pressure loss and heat transfer. In moderate and shallow water vertical wells, the effect of drilling fluid properties on temperature and pressure is often small because the effects of temperature and pressure can partially cancel each other out in different locations and in different directions in the well as the temperature continues to change . However, in large displacement wells, the drilling fluid flows down the drill pipe