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基于多相压力波响应图版识别超深井气侵位置
孙腾飞1,李永安1,张杨1,孔祥伟2
(1.北京化工大学机电工程学院,北京 100029;2.长江大学石油工程学院,湖北武汉 430000)
摘要:
考虑相界面雷诺应力、拖拽力、虚拟质量力、气液物性差异等参数,创建井筒多相压力波速及压力响应数学模型,基于超深井环空多相压力波响应图版唯一性,提出压力波响应图版识别超深井气侵位置的新方法;考虑井口气体溢流量、回压、钻井液密度等边界参数,结合差分数学方法对其求解,该方法在超深井YS1井(8680 m)验证,压力响应误差小于等于1.703 s,计算与实测误差小于等于6.15%。结果表明:随回压增大,井筒流体可压缩性减小,井筒压力波速增大,压力响应时间减小;随井口气体溢流量增大,环空空隙率增大,压力波速减小,井筒压力响应时间延长,井口气体溢流量从0.83 L/min变化至38.33 L/min,井底8680 m处压力响应时间从10.127 s增至36.643 s,增大了261.83%;气侵位置识别结果不仅取决于井口压力及流量传感器准确度,也与压力波响应图版计算准确性有关;实践证明借助压力波响应图版识别超深井气侵溢流位置的方法可行。
关键词:  压力波响应图版  气侵位置  压力波速  多相流  多相压力
DOI:10.3969/j.issn.1673-5005.2024.02.009
分类号:
文献标识码:A
基金项目:
SUN Tengfei1, LI Yongan1, ZHANG Yang1, KONG Xiangwei2
(1.School of Mechanical and Electrical Engineering, Beijing University of Chemical Technology, Beijing 100029, China;2.Petroleum Engineering College, Yangtze University, Wuhan 430000, China)
Abstract:
In this study, considering the parameters of phase interface Reynolds stress, drag force, virtual mass force and gas-liquid physical property difference, a mathematical model of wellbore multiphase pressure wave velocity and pressure response was established, and a new method for identifying the location of gas invasion in ultra-deep wells was proposed based on the uniqueness of the multiphase pressure wave response chart in the wells. In consideration of the boundary parameters, such as wellhead gas overflow rate, backpressure and drilling fluid density, the solution of the model was programed using a differential mathematical method. The new method was verified using the data from an ultra-deep well YS1 (8680 m), with the pressure response error less than 1.703 s, and the calculation and measurement error less than 6.15% for predicting the gas invasion location. The results show that, with the increase of the backpressure, the compressibility of wellbore fluid decreases the velocity of wellbore pressure wave increases and the pressure response time decreases. With the increase of the wellhead gas flow rate, the annulus void ratio increases, the pressure wave velocity decreases and the wellbore pressure response time will be prolonged. For instance, when the wellhead gas flow changes from 0.83 L/min to 38.33 L/min, the pressure response time at 8680 m of the bottom hole can be increased by 261.83%, from 10.127 s to 36.643 s. The results of gas invasion location identification not only depend on the accuracy of wellhead pressure and flow sensors, but also on the calculation accuracy of the pressure wave response chart. This study has proved that identifying the gas invasion location in ultra-deep wells by means of the pressure wave response chart is feasible.
Key words:  pressure wave response chart  gas invasion location  pressure wave velocity  multiphase flow  multiphase pressure
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