大庆油田铝合金桥塞专用磨鞋改进与应用

Improvement and application of special milling shoe for aluminum alloy bridge plug in Daqing Oilfield

针对大庆油田在大规模体积压裂施工中使用的铝合金桥塞难以高效磨铣的问题,开展了其专用磨鞋的研究及改进。根据铝合金桥塞结构特点,采用仿铣刀结构形式研制了铝合金桥塞专用磨鞋,并对该专用磨鞋在现场多级桥塞磨铣试验中的耐用性进行分析,从切削刃结构、切削刃材质、切削齿等方面进行改进。改进后的专用磨鞋切削刃由120°改形为90°,材质为高密度硬质合金,在切削齿后方增加辅助齿;室内实验及现场试验表明,改进后的专用磨鞋的耐用性和磨铣胶筒的效率得到提高,桥塞碎屑形态较细小,最佳钻压为8~15kN。铝合金桥塞专用磨鞋的改进与应用为降低大庆油田体积压裂综合施工成本、实现难采储层高效开发提供技术支撑。

The aluminum alloy bridge plug has been widely used in the large scale volume fracturing in Daqing Oilfield,for it is difficult to drill or mill efficiently,the research and improvement of special milling shoe for aluminum alloy bridge plug has been carried out.According to the structure characteristics of the aluminum alloy bridge plug,the special milling shoe for the aluminum alloy bridge plug has been developed by simulating the structure of milling cutter.The durability of the special milling shoe in multi-stage bridge plug milling&drilling was analyzed in the field test to make improvements on the structure and material of the cutting edge,and the cutting teeth and so on.The improved cutting edge of special milling shoe is changed from 120°to 90°.Its material adopts the high density carbide,and the auxiliary teeth were installed behind the cutting teeth.The laboratory experiment and field test showed that the durability of the improved special milling shoes and the milling efficiency of rubber were improved.The debris of the bridge plug was in small form with optimal WOB from 8 to 15kN.The improvement and application of special milling shoe for aluminum alloy bridge plug provides the technical support for reducing the comprehensive operation cost of volume fracturing in Daqing Oilfield and achieving the high efficient development of difficult-recover reservoirs.