致密砂岩气藏体积改造增产效果数值模拟

段瑶瑶，王欣，王永辉，严星明，鄢雪梅

(中国石油勘探开发研究院廊坊分院，河北廊坊 065007)

摘要：随着勘探开发工作深入，致密砂岩气藏储量所占比例不断提高，体积改造是实现该类气藏突破的重要技术手段。为研究体积改造在致密砂岩气藏中的增产效果，采用Eclipse油藏数值模拟软件，以苏里格致密砂岩气藏为基础，基于数值模拟方法对体积改造与常规压裂的开发效果进行对比，研究了不同基质渗透率和裂缝网络间距对体积改造增产效果的影响。结果表明，基质渗透率和裂缝网络间距对体积改造的有效性起关键作用；基质渗透率越低，裂缝网络间距越小，体积改造的增产效果越好；当基质渗透率达到一定界限时，体积改造的增产效果有限，不适合大规模体积改造；降低裂缝网络间距，可提高体积改造有效性的基质渗透率界限。该研究对致密砂岩气藏进行体积改造，提高单井产量和气田开发效果具有指导意义。

关键词：致密砂岩气；体积改造；基质渗透率；裂缝网络间距；增产效果

中图分类号:TE371

基金项目：国家科技重大专项(2011ZX05013)资助。

作者简介：第一段瑶瑶(1983年生)，女，工程师， 2007年毕业于中国石油勘探开发研究院，现从事致密气藏储层改造工作。邮箱：duanyy69@petrochina.com.cn。

Numerical Simulation of Stimulation Effect by Volume Transformation of Tight

Sandstone Gas Reservoir

Duan Yaoyao, Wang Xin, Wang Yonghui, Yan Xingming, Yan Xuemei

(ResearchInstituteofPetroleumExplorationandDevelopment-LangfangBranch,Langfang，HebeiProvince065007,China)

Abstract:With further exploration and development, and the increasing proportion of tight sandstone gas reservoir, volume transformation is an important technical means for the breakthrough in achieving this kind of gas. By means of eclipse software, based on the data of Sulige tight sandstone gas, we compared the development effect of numerical simulation method with the conventional methods, and studied the impact of different matrix permeability and fracture network spacing on the yield-increasing effect of volume fracturing. Results showed that the matrix permeability and fracture network spacing played a key role on the validity of volume fracturing; the lower the matrix permeability and the smaller the network fracture spacing, the higher the production contribution of network fracture; when matrix permeability reached a certain limit, the stimulation effect of network fracture was limited, so it was not suitable for large-scale volume fracturing; reducing the fracture network spacing could enhance the limit of matrix permeability which was suitable for volume fracturing. The study had a guiding significance for improving the effect of single well production and gas field development of tight sandstone gas reservoir by means of SRV.

Key words: tight sandstone gas; volume transformation; matrix permeability; fracture network spacing; stimulation effect

致密砂岩气藏(简称致密气藏)是指基质覆压渗透率小于 0.1mD的砂岩气，单井一般无自然产能或自然产能低于工业气流下限，但在一定经济条件和技术措施下可获得工业天然气产量[1]。……