深层砂岩裂缝性气藏缝网压裂裂缝导流能力分析  

Analysis on fracture conductivity of fracture network fracturing in deep sandstone fractured gas reservoir

作　　者：林应之 林启才 邓世杨 李翼 LIN Yingzhi;LIN Qicai;DENG Shiyang;LI Yi(Downhole Operation Company,CNPC Chuanqing Drilling Engineering Company Limited,Chengdu,Sichuan 610052,China)

机构地区：[1]中国石油集团川庆钻探工程公司井下作业公司,四川成都610052

出　　处：《油气井测试》2021年第5期9-17,共9页Well Testing

摘　　要：针对深层、超深层气藏缝网压裂及其裂缝特征,采用高强度支撑剂对支撑裂缝导流能力进行评价,结合岩心裂缝流动实验,对支撑剂不同铺置浓度的支撑裂缝导流能力,岩心单裂缝、多裂缝交错缝的连通与导流能力等进行模拟实验,分析了裂缝连通与支撑对裂缝及裂缝网络渗流性的影响。研究结果表明,裂缝支撑主要有支撑剂铺置支撑、错位缝自支撑和岩石碎块支撑。其中多层铺置和局部单层铺置支撑裂缝具有高导流能力,是缝网裂缝重要的渗流特性。采用变粒径、变黏度、变排量和阶梯连续加砂等技术措施,有利强化复杂裂缝的支撑和提高缝网裂缝的连通性和导流能力。该分析方法对深层、超深层缝网压裂工艺技术的改进具有重要指导性,对页岩等非常规气藏的体积压裂也具有借鉴作用。According to the“fracture network”fracturing and fracture characteristics of deep and ultra-deep gas reservoirs,high-strength proppant is used to evaluate the conductivity of supporting fractures.In addition,combined with the core fracture flow experiment,the simulation experiments are carried out on the conductivity of supporting fractures with different proppant paving concentrations,the connectivity and conductivity of single fracture and multi fracture staggered fracture in the core,and the effects of fracture connectivity and support on the permeability of fractures and fracture network are analyzed.The results show that the fracture support mainly includes proppant placement support,dislocation fracture self-support and rock fragment support.Among them,multi-layer and local single layer supported fractures have high conductivity,which is an important seepage characteristic of“fracture network”fractures.The adoption of technical measures such as variable particle size,variable viscosity,variable displacement and stepped continuous sand addition is beneficial to strengthen the support of complex fractures and improve the connectivity and conductivity of“fracture network”fractures.The analysis method has important guidance for the improvement of deep and ultra-deep“fracture network”fracturing technology and can also be used as a reference for the volume fracturing of unconventional gas reservoirs such as shale.

关 键 词：深层 砂岩 裂缝性气藏 缝网 压裂 连通性 导流能力 支撑剂 

分 类 号：TE357[石油与天然气工程—油气田开发工程]