渤海气田气井井筒积液预测方法分析
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摘要
渤海气田气井井身结构大多为斜井或大斜度井,常用的临界携液流量公式对直井积液判断具有较高精度,而对斜井或大斜度井适应性较差。为了建立适用于渤海气田的井筒积液预测模型,应用最小二乘法理论将预测值与真实值进行拟合,并考虑井斜等因素影响,拟合出气井积液预测模型的修正系数,得到适应于斜井或大斜度井井筒积液预测的修正模型。研究结果表明:修正模型计算结果与海上井斜、大斜度井气井实际积液符合度较高。该方法可用于渤海气田气井的积液预测,及早发现积液气井并采取有效的排液工艺,防止气井因井筒大量积液减产,实现其长期稳定生产。
The wellbore structures of gas wells in Bohai Gas Field were mostly inclined wells or highly deviated wells.The commonly used critical fluid-carrying flow formulae were high accuracy for judging vertical well fluid accumulation,but they were poor adaptability for inclined wells or highly deviated wells.In order to establish a prediction model for wellbore fluid accumulation in Bohai Gas Field,the theory of least square method was used to fit the predicted value with the real value and the influence of well deviation and other factors were taken into consideration.The modified coefficient of model suitable for prediction of wellbore fluid accumulation in gas wells was obtained.A modified model for prediction of wellbore fluid accumulation in inclined or large deviated wells was obtained.The results show that the calculated results of the modified model are in good agreement with the actual liquid accumulation in offshore deviated and highly deviated gas wells.This method can be used to predict liquid accumulation in gas wells in Bohai Gas Field,for the purpose of find liquid accumulation gas wells as early as possible and adopt effective drainage technology to prevent gas wells from reducing production due to large amount of fluid accumulation in wellbore for a long-term stable production.
The wellbore structures of gas wells in Bohai Gas Field were mostly inclined wells or highly deviated wells.The commonly used critical fluid-carrying flow formulae were high accuracy for judging vertical well fluid accumulation,but they were poor adaptability for inclined wells or highly deviated wells.In order to establish a prediction model for wellbore fluid accumulation in Bohai Gas Field,the theory of least square method was used to fit the predicted value with the real value and the influence of well deviation and other factors were taken into consideration.The modified coefficient of model suitable for prediction of wellbore fluid accumulation in gas wells was obtained.A modified model for prediction of wellbore fluid accumulation in inclined or large deviated wells was obtained.The results show that the calculated results of the modified model are in good agreement with the actual liquid accumulation in offshore deviated and highly deviated gas wells.This method can be used to predict liquid accumulation in gas wells in Bohai Gas Field,for the purpose of find liquid accumulation gas wells as early as possible and adopt effective drainage technology to prevent gas wells from reducing production due to large amount of fluid accumulation in wellbore for a long-term stable production.
引文
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[2]王远闯,张志全.不同气井连续临界携液流量模型研究[J].能源与环保,2017,39(10):135~138.
[3]杨文明,王明,陈亮,等.定向气井连续携液临界产量预测模型[J].天然气工业,2009,29(5):82~84.
[4]管虹翔,于继飞.大斜度气井临界携液气量预测新方法[J].中国海上油气,2011,23(1):50~52.
[5]张晓丹,吴晗,吴晓东,等.海上凝析气井排液采气配套工艺[J].石油钻采工艺,2012,34(增):48~50.
[6]Turner R G.Analysis and prediction of minimum flow rate for the continuous removal of liquids from gas well[J].J.Pet.Tech.,1969,20(1):76~82.
[7]Coleman S B.A new look at predicting gas well load up[J].J.Pet.Tech,1991,36(4):54~5.
[8]Nosseir M A.A new approach for accurate prediction of loading in gas well under different flowing conditions[J].SPE 37408,2000.
[9]李闽,郭平,谭光天.携液新观点[J].石油勘探与开发,2001,28(5):105~106.
[10]杨川东.采气工程[M].北京:石油工业出版社,2000.
[11]杨旭东,刘双全,田伟,等.苏里格气田井下节流器积液过程分析与研究[J].石油钻采工艺,2014,36(1):97~99.
[12]向耀权,辛松,何信海,等.气井临界携液流量计算模型的方法综述[J].中国石油和化工,2009,16(9):55~58.
[13]李士伦.天然气工程[M].北京:石油工业出版社,2000.