机械或液压触发无限级分段压裂滑套研制

研制了一种机械或液压触发无限级分段压裂滑套。改进现有压裂滑套的结构,设计弹性套、可变径球座,使用同一尺寸的低密度压裂球能够全通径开启若干级滑套,降低压裂后管柱的摩阻,实现储层的精细化改造,并且提供后期修井作业的无障碍通道。对弹性套、可变径球座、弹簧等零件进行理论力学分析和有限元仿真分析,均能满足要求。在室内试验,通过机械驱动过球试验,验证了滑套动作的完整性; 通过混砂压裂液开启滑套试验,得到滑套开启的最小排量为80 m³/h,该值与理论计算值相符。研制的分段压裂滑套及其配套工艺管柱可进行无限级分段压裂作业,为海上低渗和陆上非常规油气藏的精细化压裂增产改造提供技术支持。

Development of a Mechanical or Hydraulic Triggered Sliding Sleeve for Infinite Staged Fracturing

A mechanical or hydraulic triggered sliding sleeve for infinite staged fracturing has been developed by improving the existing sliding sleeve device, elastic sleeve, and deformable ball seat which realized opening several stages of sliding sleeves with the same size low-density fracturing ball with full-bore left, reduction of friction resistance along pipe string after fracturing, fine reservoir reconstruction and barrier-free access for future workover operations. Theoretical mechanical analysis and finite element simulation analysis for the elastic sleeve, deformable ball seat, and spring was conducted to verify feasibility. In the laboratory, the mechanical ball passing test was done to prove the completeness of sliding sleeve function, and a minimum opening displacement value of 80 m³/h was obtained by using sand-mixed fracturing fluid to drive the sliding sleeve open, which was also consistent with the theoretical calculation result. The device, together with its supporting string technology provides a new technology for infinite staged fracturing and can be widely used in offshore low-permeability and onshore unconventional oil and gas fields.