摘要
压裂液早期返排历史数据可用于评价水平井分段压裂效果,而有效裂缝孔隙体积是反映压裂效果的重要参数,但目前基于压裂液返排历史数据的有效裂缝孔隙体积计算方法存在准确性不高的问题。为此,基于北美最新的基于返排历史数据计算初始有效裂缝孔隙体积的研究成果,应用产量不稳定试井中的流动物质平衡方法,结合传统的产量递减方法,提出了一种利用返排历史数据定量求取有效裂缝孔隙体积的方法,并以国内某口分段压裂的致密油水平井为例,详细介绍了该方法的计算分析过程,计算发现,仅有21%的注入压裂液对裂缝导流能力有贡献。研究结果表明,该方法能有效提高有效裂缝孔隙体积计算结果的准确性,可以对水平井分段压裂效果进行正确评价。
The early flowback history data of fracturing fluid can be used to evaluate multi-stage fracturing effect for horizontal wells,and the effective fracture pore volume is a critical parameter to reflect the fracturing effectiveness.However,current calculation methods of effective fracture pore volume based on the fracturing fluid flowback history shows low accuracy.This paper presents a new method for quantitatively calculating the effective fracture pore volume based on flowback history.On the bases of the latest methodology in North America,the method uses the flowing material balance method of rate transient analysis(RTA)and is combined with a traditional production decline method.Its calculation and analysis process is introduced in detail based on a domestic multi-stage fracturing horizontal tight oil well.The calculation results show that only 21%of the injected fracturing fluid contributes to the fracture conductivity.The results show that the new method can effectively improve the calculation accuracy of the effective fracture pore volume and implement correct evaluation of multi-stage fracturing effect for horizontal wells.
作者
虞绍永
YU Shaoyong(Tartan Energy Group,Shanghai,200433,China)
出处
《石油钻探技术》
CAS
CSCD
北大核心
2021年第6期1-7,共7页
Petroleum Drilling Techniques
关键词
超低渗透地层
水平井
分段压裂
压裂液返排历史
裂缝压缩系数
有效裂缝孔隙体积
ultralow permeability formation
horizontal well
multi-stage fracturing
early flowback history of fracturing fluid
fracture compressibility coefficient
effective fracture pore volume
