分段压裂水平气井产能数值模型建立

随着水平井分段压裂技术在致密气藏开发中广泛应用,压裂后产能的预测对开发此类气藏具有重要意义。应用复位势理论和势叠加原理等基本渗流理论,结合水平井压后裂缝形态和单相气体渗流机理,推导出考虑水平井筒内压降损失时的产能预测新模型。模型综合考虑了多条裂缝间的相互干扰和各条裂缝的长度、缝宽、导流能力、缝间距对各条裂缝产量的影响以及水平井筒内压降损失对产能的影响,建立了考虑多因素的水平气井产能数值模型。编制了模拟计算软件。并以长庆油田某致密气藏区块为例进行了裂缝方案优化设计。研究成果对于低渗致密气藏井网部署及开发方案编制具有一定的指导意义。

Establishment of productivity numerical model of fractured horizontal gas wells

Accompanied with the widely used of fractured horizontal wells technology in tight gas reservoir, productivity prediction after fracturing of developing this kind of gas reservoir is of great significance. According to the complex potential theory and potential superposition principle, combined with the shape of fractures after fracturing and single-phase gas seepage mechanism, a new productivity prediction model considering pressure drop loss in horizontal wellbore was derived. Model considers the influence on productivity of fractures produced by mutual interference between fractures and the length, width, conductivity, interval of fractures and the influence on horizontal wells produced by pressure drop loss. A gas well productivity numerical model considers multi-factor was established and a simulation software was compiled. Take a tight gas reservoir in Changqing oil field as an example, designing a fracturing scheme optimization. Research results have significance to the tight gas reservoirs pattern arrangement and making up development plan.