上翘井中可溶桥塞泵送流量和驱动力仿真分析

泵送可溶桥塞工艺是目前页岩气、页岩油大规模体积压裂改造的关键技术。基于涪陵地区页岩气示范区块的井况参数,应用Fluent软件分析可溶桥塞在1～5 m³/min流量下的驱动力。流量越大,产生的驱动力越大。分析了上翘井中流量为0.25～1.25 m³/min时可溶桥塞中卡瓦的受力,并考虑泵送管柱的自重力、井斜角度以及电缆张力的因素,分析桥塞泵送坐封过程的安全性。现场应用中,上翘井的最大井斜108.6°,在0.5 m³/min的流量下,可溶桥塞成功坐封并丢手,验证了模拟分析的准确性。该研究结果为可溶桥塞的设计,以及在水平井、上翘井中的泵送提供理论依据。

Simulation Analysis of Pump Flow Rate and Driving Force of Soluble Bridge Plugs in Upwarping Wells

Pumping soluble bridge plug is a key technology for large-scale shale gas and oil fracturing. Based on Fluent software, the driving force calculation of soluble bridge plugs at different displacement rates of 1～5 m³/min with well condition parameters in Fuling shale gas demonstration area was carried out, and the plug setting in the upwarping well with displacement rates of 0.25～1.25 m³/min was analyzed. The greater the flow rate, the greater the driving force produced. Considering the pump string’s dead weight, inclination Angle, and cable tension, the safety of the plug pumping and the setting process was analyzed. The accuracy of the analysis was verified by the successful setting of the soluble plug at 0.5 m³/min in a 108.6°maximum deviation upturned well. The research results provide a design direction for the product design of soluble bridge plugs in horizontal and upwarping wells and the theoretical basis for the field application of soluble bridge plugs.