致密压裂气井裂缝动态评价新方法

压裂是致密气开发的重要技术手段,致密气只有经过压裂才能获得工业气流。而对压裂裂缝的深入认识则是气田高效开发的重要基础。目前关于裂缝评价的技术诸如微裂缝检测等多为静态描述,且大部分技术成本昂贵,实施难度大。提出了一种裂缝动态评价方法,该方法通过将成熟的不稳定试井技术和生产动态分析方法相结合,可以准确获得裂缝的参数,并通过生产数据分段拟合则可获知裂缝的动态变化状况。同时以苏里格致密气井为例,并且调研分析前人的研究成果,回归出了裂缝与地层压力的关系式。

The New Fracture-Performance Evaluation Method for Tight Gas Fractured Well

Fracturing stimulation is a vital technique for tight gas development. Commonly, tight gas well can only reach industrial flow after fracturing treatment. Therefore, deeply understanding fracture in fractured well is important basis of efficient development of gas field. At present, the technique e.g. Microseismic Monitoring for fracture-diagnosis obtain static data and quite expensive which difficult to implement. A new method presented in this paper can evaluate fracture performance by combining well testing with production data analysis. Through segmentation of production data which are applied for analysis, behavior of fracture can be gained precisely. In addition, taking a well from Sulige field as an example and by investigating the previous researches, relation equation between property of fracture and formation pressure is regressed.