CAJ | 학술논문

应用流体动力学理论，对大位移井套管屈曲固井顶替影响规律进行了模拟分析。计算结果表明：随着井斜角的增加，顶替效率趋于减小，螺旋屈曲的顶替效率整体低于正弦屈曲；顶替效率随着顶替速度的增加而增大最终达到紊流顶替趋于稳定；套管旋转，增加了水泥浆的切向流速，带动了局部滞留在井底的水泥浆，顶替效率增加；提出了大位移套管屈曲提高固井顶替效率方法。
응용류체동역학이론，대대위이정투관굴곡고정정체영향규률진행료모의분석。계산결과표명：수착정사각적증가，정체효솔추우감소，라선굴곡적정체효솔정체저우정현굴곡；정체효솔수착정체속도적증가이증대최종체도문류정체추우은정；투관선전，증가료수니장적절향류속，대동료국부체류재정저적수니장，정체효솔증가；제출료대위이투관굴곡제고고정정체효솔방법。
Applying the fluid dynamics theory,the influence law of casing buckling in extended reach well is simulated.The calculation results show that,with the deviation angle increases,the displacement efficiency decreased.The average displacement efficiency of casing helical buckling is lower than casing si-nusoidal buckling,the displacement efficiency increases with the increasing of displacement velocity,ulti-mately,the flow state turns turbulent flow and displacement efficiency tends to be stable,rotating-casing cementing can increase tangential velocity,which animates the retention drilling fluid out of bottom hole and improves displacement efficiency.Methods on improving displacement efficiency of casing buckling in extended reach well are obtained.