油气上窜速度计算方法的修改

Amendment of the calculation method of oil and gas ascending velocity

油气上窜速度对于钻井和井下作业施工是一个重要的参数,但是用已有的迟到时间法公式计算新疆油田深井、超深井的油气上窜速度存在误差。根据油气在钻井液中运移的规律分析认为,原有公式中钻井液静止时间是引起误差的一个重要原因。为使求出的油气上窜速度更加准确,提出用油气上窜时间代替钻井液静止时间,并介绍了对油气上窜速度计算公式的修改。通过在新疆油田近50口井的现场实际应用,表明该计算方法正确可靠,效果明显,为钻井和井下作业安全施工提供了重要依据。

Oil and gas ascending velocity is an important parameter for drilling and underground operation.But the velocity is not accurate,which is calculated with the present lagged-time method for the deep wells or the ultra-deep wells of Xinjiang Oilfield.According to the movement law of oil and gas in drilling fluid,drilling fluid static time in the original formula is regarded as one of the important reasons causing errors.It is more reasonable that the drilling fluid static time of the formula were replaced by the oil and gas ascending time.The field application of it in nearly 50 wells of Xinjiang Oilfield has proved that the method is correct and reliable and can provide a safety basis for drilling and underground operation.