连续油管水力压裂管内摩阻研究进展

连续油管水力压裂摩阻是压裂设计中的重要内容,同时也是压裂能否成功的指标之一。连续油管水力压裂过程中,由于对流体性质、支撑剂、曲率效应等造成的复杂流动理解不足,使得准确预测管内摩阻非常困难,尤其在卷筒上的螺旋段,因而实验成为当前研究连续油管管内摩阻的重要手段。研究认为:在其他条件不变的情况下,摩阻随连续油管管径的增大急剧变小;随压裂液排量增大而增大;随连续油管下入深度的增加总摩阻变小;随黏度和流行指数的增大而增大;随支撑剂积分数增大摩阻先增大而后减少。

RESEARCH PROGRESS OF THE FRICTION PRESSURE DROP IN THE HYDRAULIC FRACTURING COILED TUBING

The friction in the oiled tubing hydraulic fracturing is the important part of the fracturing design,and also the index to determine whether the fracturing is a success or not.In the process of the fracturing,because of the lack of the understandings of the complex flow caused by the fluid properties,the proppant,curvature effects,the accurate prediction of the friction in the tubing is rather difficult,especially in the spiral section,so the experiment has become the important tool to study the friction in the oiled tubing.The research achievements show that on the condition that the other parameters are invariant,the friction losses sharply with the increase of the coiled tubing di ameter and increases with the rise of the discharge capacity of the fracturing liquid;the total fraction is also decreased with the increase of the run depth of the oiled tubing;the friction increases with the rise of the viscosity and flow behavior indices and first enhances and then decreases with the volumetric fraction of the proppant.