裂缝性油藏加砂压裂压力递减分析研究及应用

THE FRACTURE PRESSURE ANALYTICAL STUDY AND APPLICATION ON FRACTURED RESERVOIR

现有的压降分析解释技术只适合于低渗透均质油藏,而不能解释裂缝性油藏的压裂裂缝参数。为了克服传统压降分析解释技术中的不足,在前人研究的基础上,发展和完善了水力压裂压降分析方法,提出了适合裂缝性油藏的压降分析理论和解释技术,并研制了相应的解释软件。该软件可较好地用于裂缝性油藏的压裂压力降落分析,可以解释获得一些重要的裂缝及储层参数,如裂缝滤失系数、初滤失系数、闭合压力、闭合时间、延伸时间、裂缝长度、裂缝宽度,以及压裂液效率等。通过实例计算,说明了解释模型、方法具有一定的可靠性和实用性,这对裂缝性油藏压裂裂缝参数的解释,以及运用获得的参数进行压裂施工效果评价和压裂设计指导具有重要的意义。

The existent pressure drawdown analysis technologies interpret nothing but low permeability and isotropy reservoirs,instead of interpreting pressure decline analysis of anisotropic fractured reservoir where there are a lot of natural fracture. To overcome the deficiency of the traditional pres sure drawdown analysis technologies, based on the research made by people , this paper develops and consummates the pressure decline analysis and interpreting technology of by draulic fracturing,and formed! new pressure drawdown anal ysis interpretation method and homologous interpretation software. With the software,the fracture pressure decline analysis of fractured reservoir can be done well, and some im portant parameters on fracturing and reservoir can be obtained, such as leak off coelficient, spurt loss coefficient, matching pressure,shut in pressure and so on Through many examples, it is proved that interpretation models, methods and software are reliable and applied So it is true of pressure decline analysis of the natural fracture developmental anisotropic fractured reservoir.and can interpret the effect of fracturing construction , which is great significant for fractur-ing design