油气上窜速度计算方法的改进与现场应用

Improvement and field application of the calculation method of oil and gas upward flow velocity

油气上窜速度是现场油气层评价和井控安全评估的关键参数,其准确与否直接关系到现场钻井施工的井控安全。通过对油气上窜速度影响因素的分析得知,地质因素和非地质因素是影响油气上窜速度的两类主要原因,而非地质因素中的钻具排替作用则是现场油气上窜速度计算存在误差的主要影响因素。通过对钻具排替作用影响的分析,得出不同工况下油气上窜速度传统理论计算方法的改进公式。现场应用表明,改进后的计算方法能有效消除钻具排替作用的影响,为保障钻井施工的井控安全、随钻压力监测以及油气层评价提供准确依据。

The velocity of oil and gas upward flow is the key parameter for the evaluation of oil and gas reservoirs in the field and the safety assessment of well control,whether it is accurate or not is directly related to the well control safety of field drilling.Through the analysis of the factors affecting the velocity of oil and gas upward flow,it is found that the geofactors and non-geofactors are the two main causes of affecting the oil and gas upward flow velocity.The displacing of drilling tools in non-geofactors is the main influence factor of the error in the calculation of the oil and gas velocity in the field.Through the analysis of the influence of the displacement of the drilling tools,the improved formula of the traditional theoretical calculation method for the velocity of oil and gas upward flow under different working conditions is obtained.Field application shows that the improved calculation procedure can effectively eliminate the influence of drilling tool displacing action.The accurate basis is provided for ensuring well control safety of drilling construction,pressure monitoring while drilling and hydrocarbon reservoir evaluation.