结构参数对压裂双弯头冲蚀及流致变形的影响  

Effect of Structural Parameters on Erosion Wear and Flow Induced Deformation of the Double-elbow Used for Hydraulic Fracturing

作　　者：杨思齐 樊建春[1] 张来斌[1] YANG Siqi;FAN Jianchun;ZHANG Laibin(College of Safety and Ocean Engineering,China University of Petroleum(Beijing),Beijing 102249,China)

机构地区：[1]中国石油大学(北京)安全与海洋工程学院,北京102249

出　　处：《润滑与密封》2021年第10期1-8,共8页Lubrication Engineering

基　　金：国家重点研发计划项目(2017YFC0804500);中石化集团公司项目:页岩气压裂系统安全监控与连续油管在线监测技术.

摘　　要：双弯头管汇是水力压裂地面高压管汇系统中的关键部件,由于高压大排量携砂压裂液在其中多次强制转向,双弯头管汇长期遭受着严重的冲蚀磨损和流致变形。为改善管件冲蚀磨损状态,从管汇结构参数的角度研究其对冲蚀率的影响。采用计算流体力学(CFD)数值模拟,结合离散相模型(DPM)和流固耦合(FSI)方法,对双弯头结构管汇在工况条件下的流致冲蚀和变形情况进行综合分析,研究双弯头结构参数,如连接直管长度、管道内径及弯头间连接角度对冲蚀和变形的影响。结果表明:随着连接直管长度增加,冲蚀率先减小后变化不大,而结构变形程度逐渐增大,综合考虑冲蚀磨损和结构变形,双弯头之间的连接直管长度宜设计为管道外径的4倍;大口径管道的冲蚀磨损程度更低,但会带来更大的变形,因此双弯头管汇的管内径不宜过大或过小;当2个弯头间的连接角度为0°时,冲蚀和变形程度达到最小。Double-elbow is an important component of high-pressure manifold system used for hydraulic fracturing.The high pressure and large displacement liquid-particle two-phase fracturing fluid can be forced to change direction many times through the double-bends,which makes the double-bends suffer serious erosion wear and flow-induced deformation.In order to improve the erosion wear state of pipe fitting,the influence of manifold structural parameters on erosion rate was studied.The computational fluid dynamics(CFD)numerical investigation was employed to conduct a comprehensive analysis of flow erosion,and flow induced deformation by the coupling of discrete phase model(DPM)and FSI methods.The effects of structural parameters such as connection straight pipe length,pipe inner diameter and fluid turning direction on erosion wear and flow-induced deformation were discussed.The results indicate that with the increase of connection straight pipe length,the flow erosion decreases first then varies little,but the deformation gradually increases.Considering the effect on erosion wear and structural deformation,the length of connection straight pipe should be designed to be 4 times the outer diameter of the pipe.Slight erosion wear but large structural deformation in major inner diameter pipe,therefore the inner diameter of the double-elbow should not be too large or too small.The minimum degree of erosion and flow-induced deformation present with the fluid turning direction of double-bend as 0°.

关 键 词：冲蚀磨损 双弯头管汇 流固耦合 固液两相流 流致变形 

分 类 号：TH117.1[机械工程—机械设计及理论]