筛管完井高能气体压裂模拟实验研究

SIMULATION STUDY ON HIGH ENERGY GAS FRACTURING IN SCREEN COMPLETED WELLS

筛管完井高能气体压裂技术是筛管完井油气储层增产的重要手段,进行筛管完井高能气体压裂模拟实验对于探究其增产机理、压裂前后筛管防砂性能变化规律和优化施工工艺具有重要意义。本文充分考虑筛管完井高能气体冲击破岩过程中的瞬态性和复杂性,利用施加围压的水泥靶来模拟筛管完井固体火药高能气体压裂过程,探究裂缝形态及整个压裂过程对筛管防砂性能的影响。研究结果表明:筛管完井固体火药高能气体压裂技术可在地层中产生2~4条经向裂缝;压裂后筛管防砂性能略有下降,旧筛管与新筛管防砂性能相比显著下降,但对后续生产无影响;裂缝条数和筛管防砂性能下降程度与峰值压力和升压速率有关,峰值压力越大,裂缝条数越多。该研究成果对于筛管完井高能气体压裂现场施工具有一定的指导意义。

High energy gas fracturing for screen completed wells is an important means for oil and gas reservoir production.It is essential to study high energy gas fracturing for screen completed wells by simulation experiments,which can explore the mechanism of production improvement,sand control behaviors of sand screens before and after fracturing,and process optimization. The transient and complex process of rock breaking during fracturing has been considered, the fracture pattern and the effects of fracturing on screen pipe behavior sare studied. The results show that high energy gas can produce 2 ～ 4 radial fractures,the sand control capability of screens will be decreased slightly after fracturing,and compared with new screens,the sand control capability of the old screens is decreased significantly,but it will not affect the subsequent production. The number of fractures and sand control capability degradation degree are related with the peak pressure and pressure rising rate,the higher the peak pressure,the more the number of fractures.This study results will be significant for the high energy gas fracturing in screen completed wells.