大斜度高液气比气井连续携液气流速预测方法 |
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引用本文: | 刘晓旭,李旭,王磊,谢宝财. 大斜度高液气比气井连续携液气流速预测方法[J]. 石油钻采工艺, 2022, 44(1): 63-69. DOI: 10.13639/j.odpt.2022.01.010 |
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作者姓名: | 刘晓旭 李旭 王磊 谢宝财 |
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作者单位: | 1.中国石油冀东油田公司钻采工艺研究院 |
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摘 要: | 南堡油田天然气井液气比高,井型以定向井、大斜度井为主,现有携液液膜模型未充分考虑倾斜角的影响,导致临界携液气流速计算不精确。基于倾斜管环状流液膜厚度分布实验数据,提出了倾斜管底部液膜厚度与垂直管环状流液膜平均厚度之间的关系式,确定了垂直管液膜平均厚度以及界面摩擦因数的经验关系式,建立了大斜度高液气比气井临界携液气流速预测新模型。实验和生产数据表明,模型准确可靠,临界携液气流速平均误差?7.67%。该模型是对现有定向井携液理论的发展和完善,有助于提高气藏大斜度井的管柱设计水平、气井配产水平以及气井投产后的积液诊断能力。
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关 键 词: | 气井 高液气比 井筒积液 连续携液气流速 液膜模型 |
Prediction method of continuous liquid-carrying gas flow rate for highly deviated and high liquid-gas ratio gas wells |
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Affiliation: | 1.Research Institute of Drilling and Production Technology, PetroChina Jidong Oilfield Company, Tangshan 063000, Hebei, China2.Nanpu Oilfield Operation Area, PetroChina Jidong Oilfield Company, Tangshan 063000, Hebei, China3.Exploration and Development Department, PetroChina Jidong Oilfield Company, Tangshan 063000, Hebei, China |
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Abstract: | The natural gas wells in Nanpu Oilfield are of high liquid-gas ratio, and the well types are mainly directional wells and highly deviated wells. The existing liquid-carrying liquid film model does not fully consider the influence of the inclination angle, resulting in inaccurate calculation of the critical liquid-carrying gas flow rate. Based on the experiment data on the distribution of liquid film thickness of the annular flow in inclined tubes, the relationship between the thickness of the liquid film at the bottom of inclined tubes and the average thickness of the liquid film of the annular flow in vertical tubes was proposed, the empirical relational expression between the average thickness of the liquid film in the vertical pipe and the interfacial friction coefficient was determined, and a new model for predicting the critical liquid-carrying gas flow rate for wells with high inclination and high liquid-gas ratio was established. The experiment and production data show that the model is accurate and reliable, with an average error of ?7.67%. This model is the development and improvement of the existing liquid-carrying theory for directional wells. The new model is helpful to improve the design quality of the tubing string for the highly deviated wells in the gas reservoir, to enhance production allocation level for gas wells, and to improve the diagnostic ability of the liquid accumulation after the gas well is put into production. |
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