多层气藏低伤害压裂技术研究  

Study on less hazardous fracturing technique for multilayer gas reservoir

作　　者：王欣[1] 胥云[1] 赵勇[2] 杨艳丽[1] 段瑶瑶[1] 李达[2] 

机构地区：[1]中国石油勘探开发研究院廊坊分院,河北廊坊065007 [2]长庆油田公司苏里格气田研究中心,陕西西安710018

出　　处：《石油钻采工艺》2010年第B11期133-137,共5页Oil Drilling & Production Technology

摘　　要：压后产量低和稳产难度大是低渗、多薄层气藏面临的主要问题。影响此类气藏高产稳产、最大限度解放储层的主要原因包括:在压裂优化设计时没有考虑气藏的特征,大多沿用油藏的优化方法;压裂液体系伤害大,返排困难,无法得到预期的裂缝导流能力;多薄层气藏在分层压裂时由于层间的非均质性造成纵向上不同小层动用程度不均衡,影响气井稳产。为此,以苏里格气田为例,研究了针对气藏的压裂优化方法,优选了低伤害的压裂液体系,大大降低对气层尤其是对裂缝导流能力的伤害,形成根据不同应力差、储隔层条件的分层压裂方式确定图版和配套的分层控制技术,以充分提高各小层的改造程度和有效支撑,现场应用4井11层,两口井实现了地质分类升级,应用效果突出。Post fracturing gas reservoir,with low-permeability and multi-thin-bed,generally encounters low output and astable yields.These problems occur mainly because the fracturing optimization method for oil reservoir is copied without consideration of gas reservoir property,hazardous fracturing fluid system causes flowback difficulties resulting in the failure of expected fracture conduc-tivity,and vertical sublayers in multi-thin-bed gas reservoir appear unequal fracturing effect due to interlayer heterogeneity.For these reasons,taking Sulige gas field for example,the study on fracturing optimization technology aiming at gas reservoir was conducted and less hazardous fracturing fluid system was developed.Field application shows that the damage to gas bearing formation,particularly to fracture conductivity,was enormously descreased.Furthermore,in accordance with distinct stress difference and different conditions in bearing formation and barrier bed,separate layer fracturing method and layering control technique were studied.This technology was used in 11 layers of 4 wells and geological classification upgrading was achieved in 2 wells.

关 键 词：多层气藏 低伤害压裂液 裂缝优化 分层压裂 分层控制技术 

分 类 号：TE357.1[石油与天然气工程—油气田开发工程]