摘要
目前利用泥浆池液面增加、泥浆出口流量大于入口流量来检测气任的方法，均是建立在气体体积膨胀基础上的，所以像在小井眼钻井及复杂地质条件下钻井中，这些方法发现气侵太晚。文章对气侵后气体在井眼中分布进行了研究，其结果表明：气体侵入井眼后在井底不是连续气柱，而是按气液两相流流型分布。通过声波在气液两相流中传播速度试验证明，武德近似公式可以用来计算声波在该两相流中的传播速度。运用室内及中原油田全尺寸并控实验井实验数据建立的气体上升速度模型，与国外使用的模型进行了对比模拟运算，提出了依据实际时间、声波在环空泥浆传播时间及有关模型，可以实时计算气侵高度和并底进气量，为适时并控提供可靠的依据。
The methods of detecting gas cut by observing the increase of mud pit surface,the outlet flow is larger than inlet flow,are based on gas amplification. But in the case of small hole drilling or drilling in complex geologic conditions,the discovery of gas cut by this method is too late.The research of gas distribution in the borehole after gas cutting shows that the gas invaded into the hole is not a successive gas column,but distributes as gas-liquid twophase flow.The testing of transmission speed of sonic wave in the gas-liquid two-phase flow indicates that Wood formula can be used to calculate the transmission speed of sonic wave in the two-phase flow. Based on the experimental data of full-scale well control experiment under room condition and in Zhongyuan oil field,a gas rise speed model is built and is compared with foreign one on simulating calculation. By this model,the real-time gas cut height and bottomhole inflow can be calculated on the basis of real time,time of sonic wave transmit in annular mud and the model concerned to provide more reliable basis for well control.
出处
《天然气工业》
EI
CAS
CSCD
北大核心
1995年第4期19-22,共4页
Natural Gas Industry
