水平井仿生磨鞋钻磨复合桥塞的设计与仿真

Design and Simulation of Bionic Mill Shoe for Milling composite bridge plug in Horizontal Wells

针对水平井可钻式复合桥塞技术钻塞效率低及返屑困难等问题,以土壤动物蜣螂的胸节背板为仿生原型,设计出一种仿生孕镶金刚石取心磨鞋(以下称仿生磨鞋)。仿生磨鞋以"套铣"的方式钻磨多级复合桥塞,与传统磨鞋相比其钻塞速度更快,返屑成功率更高。为了验证仿生磨鞋的改善效果,在有限元分析软件ABAQUS中对常用的5翼PDC镶齿平底磨鞋与仿生磨鞋进行了钻除复合桥塞仿真对比试验。仿真结果表明:两种磨鞋在钻塞方式上存在较大的差异,仿生磨鞋的钻塞速度明显快于常规磨鞋;仿生磨鞋钻除下来的钻屑尺寸更小,返屑成功率更高,卡钻的可能性更低;增加钻压与转速对提升磨鞋的钻塞速度都具有促进作用,但增加钻压的增速效果更明显;磨鞋底面最外圈边缘的磨损量最大,在加工磨鞋时应该对其优化加强。研究成果可为国内可钻式复合桥塞工艺技术的进一步发展提供理论基础。

In order to solve the problems of low milling efficiency and difficult cutting return of drillable composite bridge plug technology in horizontal wells,a bionic diamond impregnated coring mill shoe(hereinafter referred to as bionic mill shoe)was designed based on the pereonite tergum of dung beetle.The bionic mill shoe grinds multistage composite bridge plug in the way of“milling”,and has faster plug drilling speed and higher cutting return success rate than traditional mill shoe.In order to verify the improvement effect of the bionic mill shoe,the simulation comparison test of drilling composite bridge plug by the commonly used 5-flank PDC inserted tooth flat-bottom mill shoe and the bionic mill shoe was carried out in the finite element analysis software ABAQUS.The simulation results show that the two kinds of mill shoes have a big difference in the milling mode,and the milling speed of bionic mill shoe is obviously faster than that of conventional mill shoe;the size of cuttings drilled down by the bionic mill shoe is smaller,the cutting return success rate is higher,and the possibility of sticking is lower;the increase of the weight on bit and the rotary speed promotes milling speed of the mill shoes,and the effect of increasing the weight on bit is more obvious;the wear extent of the outermost ring edge at the bottom of the mill shoe is the largest,which should be optimized and strengthened at the time of processing the mill shoes.The research results provide theoretical basis for the further development of drillable composite bridge plug technology in China.