致密油藏直井多层缝网压裂产量递减分析  

Production Decline Analysis of Vertical Well with Multi-Layer Network Fracturing in Tight Oil Reservoir

作　　者：代立 尹洪军[1] 袁鸿飞 孟凡嵩 Dai Li;Yin Hongjun;Yuan Hongfei;Meng Fansong(College of Petroleum Engineering/Key Laboratory of Enhanced Oil Recovery Ministry of Education,Northeast Petroleum University,Heilongjiang Daqing 163318,China)

机构地区：[1]东北石油大学石油工程学院/提高油气采收率教育部重点实验室,黑龙江大庆163318

出　　处：《石油化工高等学校学报》2021年第5期50-55,共6页Journal of Petrochemical Universities

基　　金：国家科技重大专项“致密油体积压裂试井方法研究”(2017ZX05071005)。

摘　　要：垂向多层发育的致密油藏常采用缝网压裂进行开采,从而改善储层渗透率,提高油井产量。为此建立直井多层缝网压裂不稳定渗流数学模型,压裂后各层划分为人工裂缝区、改造区和未改造区。绘制分析Blasingame产量递减典型曲线,曲线分为7个流动阶段,总裂缝长度一定时,裂缝半长短的储层流体渗流率先到达未改造区,流体渗流阻力大,Blasingame曲线靠下;总改造体积一定时,各层改造体积差异越大,Blasingame曲线越靠下。用所建立的模型,对实测生产资料进行解释,获得各层裂缝半长、改造区渗透率等相关地层参数,该模型对进行多层缝网压裂直井产量分析具有指导意义。For improving reservoir permeability and increasing oil well production,fracture network fracturing is often chosen for tight oil reservoirs with longitudinal direction multi-layer development.A transient flow model for multi-layer fracture network fracturing in vertical wells is established.After fracturing,each layer is divided into artificial fracture area,stimulated reservoir volume(SRV)area and unstimulated reservoir volume area.The Blasingame production decline curves are drawn and analyzed.The curve is divided into 7 flow stages.When the total fracture length is fixed,the fluid seepage of the half-length fracture firstly reaches the unstimulated reservoir volume area.The fluid seepage resistance is large,and the Blasingame curve is in lower region.When the total stimulated reservoir volume is fixed during the simulation,the larger the difference of each layer exist in the stimulated reservoir volume of the reconstruction,the lower the Blasingame curve stay.The established model is used to interpret the measured production data and the relevant formation parameters,such as the fracture half-length of each layer and the permeability of the stimulated reservoir volume area,are obtained.This model has directive significance for the production analysis of vertical wells with multi-layer fracture network fracturing.

关 键 词：致密油藏 缝网压裂 典型曲线 产量递减 

分 类 号：TE357[石油与天然气工程—油气田开发工程]