水力射流深穿透射孔产能分析及参数优化

Productivity analysis and parameter optimization for deep hydraulic jet perforation wells

水力射流深穿透射孔工艺及增产机理与常规射孔有很大差异,影响产能的因素更加复杂。基于势叠加原理和微元线汇渗流理论,考虑各射孔孔眼之间流动干扰作用、射孔段变质量不规则管流以及油藏渗流和孔眼耦合流动作用,建立了水力射流深穿透射孔井产能评价分析模型,对影响深穿透射孔油井产能的主控因素及规律进行了研究。结果表明,孔眼数量、射孔深度、孔眼在平面上的分布和纵向射孔密度是影响产能的主要因素,对这些参数进行了优化,为水力射流深穿透射孔工艺方案设计提供了理论依据。

The mechanisms of perforation penetration and production of the hydraulic jetting perforation are very different from those of the conventional perforation.The factors affecting well productivity are more complex.Currently,there is no effective method and theory of productivity evaluation for the hydraulic jetting perforation.Based on the potential superposition principle and infinitesimal line congruence theory,a new productivity evaluation model for the hydraulic jetting perforation was presented.Interferences between perforations,irregular variable mass flow in perforations and coupling effect between reservoir percolation flow and perforation flow were considered.The major factors affecting well productivity were analyzed and optimized.It is found that the perforation number,the perforation length,areal perforation distribution and vertical perforation density are the major factors affecting well productivity.The study results provide an effective guide for field application and design of hydraulic jetting perforation.