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首页> 外文期刊>Natural Gas Industry B >Popularization and application of the capillary foam deliquification technology in horizontal wells with low pressures and low liquid flow rates: A case study on middle–shallow gas reservoirs in the Western Sichuan depression
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Popularization and application of the capillary foam deliquification technology in horizontal wells with low pressures and low liquid flow rates: A case study on middle–shallow gas reservoirs in the Western Sichuan depression

机译：毛细泡沫液化技术在低压低液流量水平井中的推广应用：以川西depression陷中浅层气藏为例

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摘要

The application effect of the foam deliquification technology in horizontal wells is poor because the foaming agent fails to reach the target location. In view of this, the adaptability of the capillary foam deliquification technology in the Western Sichuan Gas Field in the Sichuan Basin was analyzed from the aspects of gas flow rate, liquid flow rate and casing program of gas wells, and the design of injection depth and the selection of capillary size, tool string parameters (the maximum length and the minimum counterweight) and foam deliquification parameters (foaming agent type selection, ground injection concentration and rate) were optimized. Then, a standardized capillary operation process was developed. Finally, a field application test was carried out. And the following research results were obtained. First, the capillary foam deliquification technology has a popularization potential in the horizontal wells of middle–shallow depth, low pressure and low liquid flow rate, but it is not suitable for the wells with too low gas flow rate, too high liquid flow rate or too high condensate content. Second, the well deviation angle at the injection depth shall be between 70° and 80°, the selection of capillary size shall satisfy the requirement for tension strength by the well depth, the foam deliquification parameters shall be optimized based on the specific well conditions and the liquid loading characteristics, and the capillary operation shall comply with the standardized process. Third, by the end of July 2017, the capillary foam deliquification technology had been successfully applied in 9 horizontal wells in the Western Sichuan Gas Field with a cumulative gas increment of 295?×?104?m3. Fourth, 4 supporting technologies of the capillary foam deliquification are formed, including capillary sticking prevention, integrated agent injection and pressure measurement, combined cleaning and deliquification and capillary wellhead suspension. In conclusion, the capillary foam deliquification technology provides a technological support for the deliquification and production stabilization of horizontal wells with middle–shallow depth, low pressures and low liquid flow rates in the Western Sichuan Depression, and also provides technological reference for the deliquification of horizontal wells in the similar type of gas reservoirs.
机译：泡沫液化技术在水平井中的应用效果较差，因为发泡剂无法到达目标位置。有鉴于此，从气流量，气流量，气井套管方案，注水深度和设计等方面，分析了毛细管泡沫液化技术在四川盆地川西气田的适应性。优化了毛细管尺寸，工具串参数（最大长度和最小配重）和泡沫液化参数（发泡剂类型选择，地面注入浓度和速率）的选择。然后，开发了标准化的毛细管操作过程。最后，进行了现场应用测试。并获得了以下研究结果。首先，毛细管泡沫液化技术在中浅深度，低压和低液体流速的水平井中具有推广潜力，但不适用于气体流速太低，液体流速太高或冷凝物含量太高。其次，注入深度的井斜角应在70°至80°之间，毛细管尺寸的选择应满足井深对拉力强度的要求，泡沫液化参数应根据具体的井况和条件进行优化。液体加载特性和毛细管操作应符合标准化程序。第三，截至2017年7月，毛细管泡沫液化技术已成功应用于川西气田的9口水平井中，累计增气量为295××104×m3。第四，形成了毛细泡沫液化的4个支撑技术，包括毛细防止粘连，综合剂注入和压力测量，联合清洗和液化以及毛细井口悬挂。综上所述，毛细泡沫液化技术为川西sh陷中浅，低压，低液流量的水平井的液化和生产稳定提供了技术支撑，也为水平井的液化提供了技术参考。相似类型的气藏中的油井。

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