关键词: 高含硫地层, 钻井, 硫化氢, 气侵, 气-液两相流, 流动模型, 压力控制

Abstract: The effects of the physical properties of H₂S,including composition of H₂S,gas error factor and viscosity of H₂S on gas-inversion two-phase flow were investigated.The model for gas-liquid two-phase flow was developed by applying the two-phase flow principle while H₂S cuts the borehole.The property and changing law of the pressure at bottom hole and borehole were investigated.The model was applied to a real well case.The effects of some parameters,including the density and viscosity of drilling fluid,back pressure at wellhead and the rate of gas cutting at bottom hole,on the pressure of bottom hole were analyzed.The affecting of H₂S cutting on the pressure of bottom hole and borehole should be considered when the density of drilling fluid is added,which brings a more reasonable result.

Key words: high-sulfur, formation, drilling hydrogen sulfide(H₂S), gas cutting, gas-fluid two-phase flow, fluid flow model, pressure controlling