旋转喷头射流工具水力参数优化及结构参数优选

旋转喷头射流工具能产生高速射流，并且在射流反冲力作用下推动喷头旋转，形成复杂的旋转射流，可实现油管和套管高效清洗。以7 000 m井深条件下?73 mm油管为例，设计了与?44.5 mm连续管配套的?54 mm系列旋转喷头射流工具，开展了旋转喷头射流工具水力参数优化，并利用计算流体力学方法对工具结构参数进行优选。研究表明:当排量为270 L/min时旋转喷头射流工具的射流速度约为170 m/s，系统总压耗约为42 MPa，可以满足清洗要求；随着侧向喷嘴偏移半径增加，侧向喷嘴产生的反冲击力矩近似线性增加，其对壁面冲击压力先降低后升高；随着倾斜角度的增加，倾斜喷嘴对油管内壁冲击压力增加；转速在60~360 r/min内，倾斜喷嘴对壁面冲击压力变化不大；最优的结构参数组合为侧向喷嘴偏移半径12 mm、倾斜喷嘴倾斜角度75°、前倾喷嘴角度15°。该研究可为旋转喷头射流工具现场施工和参数优化提供指导。

Optimization of hydraulic parameters and structure parameters of rotary jetting tools

The jet tool with rotary nozzles can generate a high-speed jet flow, and under the action of the recoil force from the jet flow, the nozzles will be driven to rotate to form a complex rotating jet flow, which can achieve efficient cleaning of oil pipes and casings. Taking the ?73 mm oil tubing under the condition of 7 000 m well depth as an example, a ?54 mm series jet tool with rotary nozzles matched with ?44.5 mm coiled tubing was designed. Then, the hydraulic parameters of the jet tool with rotary nozzles were optimized, and the structural parameters of the tool were also optimized by using computational fluid dynamics method. The research shows that: when the displacement is 270 L/min, the jet flow velocity of the jet tool with rotary nozzles is about 170 m/s and the total pressure consumption of the system is about 42 MPa, which can meet the cleaning requirements; as the offset radius of the lateral nozzles increases, the back impact moment generated by the lateral nozzles increases approximately linearly, and the impact pressure on the wall decreases first and then increases; with the increase of the inclination angle, the impact pressure of the inclined nozzles on the inner wall of the oil tubing increases; when the rotation speed is within the range of 60-360 r/min, the impact pressure of the inclined nozzles on the wall surface does not change much; the optimal combination of structural parameters is the lateral nozzle offset radius of 12 mm, the inclined nozzle inclination angle of 75°, and the forward inclined nozzle angle of 15°. This research can provide a guidance for on-site construction and parameter optimization of the jet tools with rotary nozzles.