基于DPM模型的水平井水平段沥青质颗粒运移规律数值模拟研究

Abstract: To study the problem of asphaltic particles deposition in horizontal wellbore , the DPM module inFluent was used to track the particle movement in tubing.And the realizable l-e model was adopted to in-vestigate the asphaltene aggregates with a size of 10 ~ 100 um on the inner wall of tubing.The effects ofparticle size and velocity on the asphaltene particle deposition rate are analyzed when the gravity , saffmanlift , and drag forces are exerted on the particles.CFD simulation results show :① 'The deposition rate de-creases with the increase of viscosity in the laminar flow stage. This is mainly because in the laminar flow stage , the fluid flow is relatively stable and Saffiman lift decreases. The asphaltene deposition rate increasesslowly in the range from 0.001 2 Pa· s to 0.012 Pa · s; the deposition rate and percentage decrease whenthe viscosity increases from 0.012 Pa·s to 0.053 Pa·s in the turbulent stage.2The deposition percent-age and deposition rate of asphaltene particles decrease with the increase of flow rate when the particle di-ameter is 10-100 um.3When the velocity is 0.3-2 m/s ,the percentage and deposition rate of asphalteneparticles increase with the increase of particle diameter.The analysis shows that reasonable control of well-bore fluid velocity and particle diameter can be an effective means to reduce asphaltic deposition in well-bore.