CQ-TDY致密油水平井水力喷射体积压裂工具

CQ-TDY Hydraulic Jet Volume-fracturing Tools for Tight Oil Horizontal Well

目前油井水平井环空加砂拖动体积压裂是长庆油田低渗储层改造的主要方式之一。为解决该技术施工过程中常规扩张式封隔器管柱施工前无法验封、易卡钻、施工效率低等实际问题,结合该技术拖动压裂工艺特点,通过可多次重复坐(解)封胶筒的设计以及TDY高强度底封隔器和抗冲蚀水力喷射器等核心工具的研制,形成了CQ-TDY致密油水平井水力喷射体积压裂管柱。该管柱可实现油管和油套环空同时注入,能满足8m^3/min大排量的注入需求,单趟钻可施工14段,施工效率是常规水力喷射压裂管柱的3~5倍。该管柱在长庆油田累计推广应用了427井次,完成了3260段体积压裂施工,平均单趟钻具施工8段,其中有219口井实现了"一趟钻"完井,施工效率高,层间封隔可靠,大幅降低了劳动作业强度,推广应用前景广。

Currently,the technology of hydraulic jet annular sand fracturing for oil horizontal wells is one of the main ways for fracturing oflow-permeability reservoirs in Changqing Oilfield.To solve the problems with conventional expandable packer in the process of service,such as difficult for sealing,easy to unset and low efficiency,CQ-TDY hydraulic jet volume-fracturing tubing is developed on the basis ofdeveloping some core tools,such as the cylinder which can be set and released repeatedly,high-strength TDY bottom packer and anti-scour injector.CQ-TDY frac string can make simultaneous injections into tubing and casing annulus,meeting the demand for 8 m3/mininjection.The single frac string can be used for 14 fractured intervals in fracturing.The efficiency is three to five times higher as comparedto conventional hydraulic jet fracturing string.This string has been used cumulatively for 3260 intervals at 427 wells in Changqing Oilfield,with 219 wells completed by a single string.A single CQ-TDY frac string can satisfy service of eight intervals on average.High efficiencyand reliable inter-zonal isolation substantially reduce the labor intensity and give CQ-TDY frac tool a broad prospect for application.