石油钻采工艺2024，Vol.46Issue(4)：455-465,11.DOI:10.13639/j.odpt.202411001
水平井油管下深影响气井排液程度实验方法提高排液效率
The experimental method of influencing the drainage degree of gas well in horizontal well tubing depth improves the drainage efficiency
摘要
Abstract
The influence law of tubing depth on the liquid drainage effect of horizontal gas wells was explored.The influence of different structural tubing depths on the wellbore drainage effect of horizontal oil tubes was revealed through experiments.Based on the principle of geometric structure similarity,a large-scale visualizable experimental device with adjustable horizontal section angles and variable tubing depths was designed and built.The flow laws of gas wells in the start-up,stable production and end-of-production stages under different tubing depths(the distance from point A to the target point accounts for 4%to 96%of the horizontal section length)and different gas flow rates(gas flow rate of 20 to 100 m3/h)in both upward and downward inclined structures were simulated.The flow patterns were observed,and the dynamic laws of lift pressure drop and liquid holdup were tested.For downward inclined horizontal wells,the greater the tubing depth,the greater the bottom hole pressure required for well opening and start-up,and the more difficult it is to start the gas well after liquid accumulation.The total pressure drop of the wellbore with tubing placed at the toe end is 26.92%lower than that with tubing placed at the heel end,which is beneficial to improving the recovery rate of the gas well during the self-flowing liquid production stage.For upward inclined horizontal wells,the opposite is true compared to downward inclined horizontal wells.The total pressure drop of the wellbore with tubing placed at the toe end is 15.92%higher than that with tubing placed at the heel end,and the stable production time is shorter,which is not conducive to increasing production.For downward inclined horizontal wells,it is recommended to place the tubing near the toe end;for upward inclined horizontal wells,it is recommended to place the tubing near the heel end.关键词
深层页岩气/提高采收率/压裂/水平井/室内测试/井筒完整性/完井/深层Key words
Deep shale gas/Improve recovery rate/Fracture/Horizontal well/Laboratory test/Integrity of wellbore/Completion/Deep layer分类
能源科技引用本文复制引用
王志彬,石海涵,姚鑫,彭俊钢,杨靖凯,阮培莹..水平井油管下深影响气井排液程度实验方法提高排液效率[J].石油钻采工艺,2024,46(4):455-465,11.基金项目
国家自然基金"垂直气井井筒环状流场中液滴的动力学模型及其特征研究"(编号:51974263). （编号:51974263）
