上倾井泵送分簇射孔与桥塞联作技术

Pumping Multi-Cluster Perforation and Bridge Plug Joint Operation Technology for Upward Inclined Wells

储层倾角、钻井井眼轨迹控制等因素导致一些页岩气水平井井眼轨迹上倾,上倾井电缆泵送桥塞与分簇射孔联作存在诸多安全风险。根据偏心圆环间隙流理论建立了上倾井泵送推力计算模型,给出了上倾井泵送排量及上顶排量的计算方法,并采用ANSYS-Fluent仿真软件对泵送推力计算模型进行了验证分析。通过研究形成一套上倾井电缆泵送桥塞与分簇射孔联作技术。应用表明,该技术可有效防止上倾井射孔管串在坐封桥塞和射孔过程中发生反冲下滑,避免电缆受损或被射流射断等工程复杂情况。

Factors such as reservoir dip and control technology of hole trajectory can lead to the upturned hole trajectory of some shale gas horizontal wells,which may result in lots of security risks in the joint operation of the cable pumping bridgeplug and multi-cluster perforation.According to the theory of eccentric annular clearance flow,not only the model for calculating pump thrust of updip wells was built,but also the calculation method of pumping discharge and top displacement,which were verified and analyzed by ANSYS-Fluent simulation software.Based on these analysis and research,a technology of pumping multi-cluster perforation and plug joint operation are formed.Finally,pumping multi-cluster perforation and bridge plug joint operation technology is formed.The application shows that the technology can effectively prevent the perforation string from backsliding during setting the bridge plug and perforating in upward inclined well,avoiding the complicated engineering situations such as cable damage or being cut by jet perforation.