CAJ | 학술논문

固井开关滑套多级分段压裂完井工艺是为解决胜利油田低渗透难动用储量和非常规油藏的新技术，在非射孔条件下水力能量是否能突破水泥环并成功压裂地层是该工艺面临的主要问题。通过数值模拟结合室内试验，评价该完井工艺中水泥环弹性参数的影响。研究表明，水泥环强度降低过程，储层井周地层最大主应力呈增大趋势，有利于岩石起裂。但增大滑套通道口与原始最大水平地应力间的方位角时，井周地层最大主应力会降低，降低了压裂的进程，使得井周地层应力处于临界应力状态。水泥环胶结强度的数值模拟研究表明一旦突破水泥环后，压开地层效果显著，水泥胶结强度的影响是可忽略的。室内实验证实固井开关滑套压裂完井工艺水泥环在较低的压力下即可破裂，对压裂时压开储层影响不大。研究结论对优化和改进固井开关滑套多级分段压裂完井工艺及其在低渗透储层油藏应用提供了理论支持。
고정개관활투다급분단압렬완정공예시위해결성리유전저삼투난동용저량화비상규유장적신기술，재비사공조건하수력능량시부능돌파수니배병성공압렬지층시해공예면림적주요문제。통과수치모의결합실내시험，평개해완정공예중수니배탄성삼수적영향。연구표명，수니배강도강저과정，저층정주지층최대주응력정증대추세，유리우암석기렬。단증대활투통도구여원시최대수평지응력간적방위각시，정주지층최대주응력회강저，강저료압렬적진정，사득정주지층응력처우림계응력상태。수니배효결강도적수치모의연구표명일단돌파수니배후，압개지층효과현저，수니효결강도적영향시가홀략적。실내실험증실고정개관활투압렬완정공예수니배재교저적압력하즉가파렬，대압렬시압개저층영향불대。연구결론대우화화개진고정개관활투다급분단압렬완정공예급기재저삼투저층유장응용제공료이론지지。
In order to explore oil reserve with low permeability and unconventional oil reserve in Shengli Oil-field, the new technique-well cementation switch sliding sleeve multistage fracturing-has been developed, which means that complicated reservers is produced in economic and efficient way.With the condition of non-perforation, whether hydraulic energy can fracture successfully is the main problem.Aimed to evaluate the influence of elastic parameters of cement sheath in the technique, according to the research, when intensity of cement sheath decrea-ses, maximum principal stress of layer around oil reserves has the tendency to increase, and it will be helpful for rock fracturing.However, when azimuth angle between channel vent of sliding sleeve and original maximum crustal press enlarges, maximum principal stress of layer around oil reserves will decrease, which lowers fracturing process and makes the principal stress of layer around oil reserve to be the status of critical stress.In the end, the influence of cement sheath strength was analyzed.The study indicates that once the cement sheath is broken, layer fracturing will be more effective, and the influence of cement sheath is negligible.Laboratory experiment shows that, with this new technique, cement sheath will be easily broken with low pressure, and it has few effect on fracturing reserve.It is a theoretical support for optimization and application of the new technique—well cementation switch sliding sleeve multistage fracturing.