水平井裸眼分段压裂技术及现场应用

Phased Fracturing Technology and Field Applications for Open Hole Horizontal Wells

水平井裸眼分段压裂技术由于施工简单、作业效率高而被广泛应用于低孔、低渗、低压油气藏的水平井增产改造中。水平井裸眼分段压裂的关键是裸眼完井工具,其中封隔器、滑套是其重要的组成部分。在前人研究的基础上对水平井裸眼分段压裂的完井工具结构及原理进行了分析,建立了水平井裸眼压裂起裂模型,推导出水平井裸眼完井起裂的计算公式,并通过管柱摩阻公式、孔眼摩阻公式和静液柱压力公式计算压裂施工时的井口施工破裂压力,得出实际施工曲线中的破裂压力与理论破裂压力具有一定的一致性,最后通过现场实例计算了水平井裸眼分段裂缝起裂压力,并分析了影响滑套打开的主要因素。

The operation process simplicity and high operating efficiency allow the phased fracturing technolo~ for open hole horizontal wells to be widely used in the stimulation of low-porosity, low-permeability and low-pressure reservoirs. The key of it is the open Imle com- pletion tools of which packer and sleeve are the important part. On the basis of previous studies, the structures and working principles of the well completion tools are analyzed, the open hole induc, ed fracture initiation model for the horizontal wells is developed, anti the tbrmula about the fracture initiation model is derived. Combining with formulas of string friction, perforation friction and hydrostatic pressure, the theoretically calculated breakdown pressure is consistent with that in the fracturing operation curve. Finally, the main factors of influencing sleeve open are analyzed by the calculated staged fracturing fracture-initiation pressure.