A semi-analytical model to simulate the behavior of a gas kick in an annulus was developed utilizing variousconcepts,including gas solubility in oil-based drilling fluids.This simulator examines critical kick indicatorssuch as Pit Gain and Wellhead Pressure with time.It models the gas behavior using a drift-flux approachwith bubble rise velocity appropriate for flow through an annulus.It also uses the Peng-Robison equation ofstate,van der Waals mixing rules,along with binary interaction coefficients appropriate for drilling fluids,to account for gas solubility in oil-based mud.The simulation results predict that a five-barrel (bbl) gas kick,would reach the wellhead of a 10,000ft deep,non-circulating,vertical well in approximately 78 minutes.But it would only take 35 minutes totraverse the same well,if the well is circulating at 702 gallons per minute.The simulations also predict thatif there is a constant kick influx of 1 scf/sec,the first gas bubbles would reach the wellhead of the same,non-circulating well in 4.45 hours.But only take 52 minutes when it is circulating.Incorporating gas solubilityinto these simulations revealed that the choice of drilling fluid volume factor (Bo) correlation affects theresults significantly.It also showed that some of the existing Bo correlations fail,for drilling fluid swellingcalculations,at higher pressures and temperatures.Finally,the results indicate that a gas kick would takelonger to reach the wellhead when it is soluble in the mud than when it is not,regardless of the choice ofBo correlation.Most of the existing kick simulators either partially or entirely overlook the effects of solubility on gasmigration.This model accounts for the gas kick's solubility in Oil-based drilling fluids,an issue that iscritical for off-shore drilling.Applicability of empirical two-phase flow correlations developed for flow incylindrical conduits,to a gas kick situation is questionable.This simulator addresses this issue by using asemi-analytical approach for modeling two-phase flow in an annulus.
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机译：利用各种概念开发了半分析模型，以利用各种概念，包括在油基钻井液中的气体溶解度。该模拟器检查临界踢标题为坑增益和井口压力。款气体模型使用漂移通量方法的行为方法适用于通过环离开的泡沫上升速度。它还使用彭罗克米斯特斯特的彭 - 罗米米斯方程，van der WaaS混合规则，以及适合于钻井液的二元相互作用系数，以解释油中的气体溶解度基于泥浆。仿真结果预测，五桶（BBL）气踢，将达到10,000英尺深，非循环，垂直井的井口约78分钟。但它只需要35分钟坦布相同嗯，如果井在每分钟702加仑循环。仿真还预测，如果存在1 scf / sec的恒定踢球，则第一气泡将到达SA的井口我，在4.45小时内无循环。但只需要52分钟循环。本次模拟透露，这些模拟的选择显着影响结果。还表明存在一些现有的BO相关性失败，用于钻孔液膨胀，在较高的压力和温度下。最后，结果表明，当它溶于泥浆时，试气将达到井口，而不是无论选择性的相关性如何。现有的大多数现有的踢血器模拟器部分或完全忽略了溶解度对燃气迁移的影响。本文占气球对油基钻井液中的溶解度，这是对岸上钻孔临界的问题。经验两相流动的应用对于流量的INCYLINDORCE导管，对气体踢的情况产生的相关性是值得怀疑的。这是使用ASEMI-Analytica来解决这个问题的问题L造型造型环空型流动的方法。
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