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对带有腐蚀坑的φ127mm API钻杆内、外螺纹端钻杆内加厚过渡带管体刺漏前后的速度场和压力场进行模拟。结果表明:流场的诱导对存在腐蚀坑的钻杆管体的刺漏失效起着承上启下的作用,腐蚀坑越深,腐蚀坑底的湍动能越大;入口流量增大,腐蚀坑部位的剪切应力越大,钻杆的刺漏越容易发生;在相同的井况条件下,钻杆内螺纹接头端内加厚过渡带比外螺纹端刺漏失效多的原因与流场的Bernoulli效应密切相关;当钻杆内加厚过渡带管体存在刺孔时,钻杆发生刺漏失效与相应位置的环空压力密切相关,在环空压力小的位置刺漏时的湍动能和最大速度最大。
The velocity field and pressure field before and after thickened the transition pipe body in drill pipe with φ127 mm API drill pipe with corrosion pits inside and outside the pipe were simulated. The results show that the induction of flow field plays an important role in the leakage of drill pipes and pipes with corrosion pits. The deeper the corrosion pits, the greater the turbulent kinetic energy at the bottom of the corrosion pits. The larger the inlet flow rate, The greater the shear stress, the more likely to occur the leakage of the drill pipe. Under the same well conditions, the Bernoulli effect of the flow field is more close to the reason that the thickened transition zone inside the drill pipe endplug than the male end , When the thickened transition pipe in the drill pipe is punctured, the failure of the drill pipe due to the puncture and leakage is closely related to the annulus pressure at the corresponding position. The turbulent kinetic energy and the maximum velocity of the punctured leakage at the position where the annulus pressure is small are the largest .