北阿油田自喷井停喷时间预测方法研究

Prediction method for stop time of flowing wells at North Azadegan oilfield

为了准确预测北阿油田自喷井停喷时间,选择合适的时机转人工举升上产,满足油田日产指标是油田目前面临的主要问题。常规停喷预测方法主要考虑单一变量的影响,预测结果与实际偏差较大。本文提出了一套基于流入流出的多相管流和节点分析技术,同时考虑井口油压、含水率、采液指数和地层压力变化对自喷井停喷时间的影响,利用油藏工程方法和回归拟合方法建立含水率和采液指数随地层压力变化关系的停喷预测新方法。通过在北阿油田四年多的实际应用,预测结果与油井实际停喷时间高度吻合,验证了该方法的可靠性,为其他同类油藏自喷井停喷时间的预测提供借鉴和参考。

Accurately predicting the stop time of flowing wells and selecting a suitable time to transfer to artificial lifting are the main problems facing the current production in the North Azadegan oilfield.The influence of single variable is mainly considered in the conventional prediction method of flowing stop time,and the prediction result deviates greatly from the actual one.This paper presents a set of multi-phase pipe flow and nodal analysis technique based on inflow and outflow,taking into account the effects of wellhead oil pressure,water cut,production index and formation pressure on stop time of flowing wells,using reservoir engineering method and regression fitting method,a new method for predicting the relationship between water cut and production liquid index and formation pressure is established.Through more than forth years of practical application in the North Azadegan oilfield,the prediction results are highly consistent with the actual stop time of flowing wells,which validates the reliability of the method and provides reference for the prediction of stop time of flowing wells in other similar reservoirs.