Viscosity should not be below 45 sec/qt. Maintain with XCD rather than with Bentonite. Monitor hole cleaning at shakers and adjust low end rheology as required.

• 要使钻井液粘度不低于每夸脱45秒，就要用生物聚合物来维护，而不用膨润土。通过振动筛观察井眼是否干净，按要求把最终的流变性调低些。