一、前言 在油气井钻进过程中,泥浆往往会被井中的天然气或空气所污染,比重因此急剧降低,井筒内的泥浆静柱压力减小,于是就有可能引起井喷的危险。同时,气侵也使泥浆的粘度增高,从而加大泵送设备的负荷,增加泵的磨损,造成泵送系统的超载和损坏。 I. INTRODUCTION During the drilling of oil and gas wells, the mud tends to be contaminated by the natural gas or air in the well. As a result, the specific gravity is drastically reduced and the pressure on the static column of mud in the well bore is reduced. As a result, it is possible to cause blowout. At the same time, gas intrusion also increases the viscosity of the slurry, increasing the load on the pumping equipment, increasing pump wear, causing overloading and damage to the pumping system.