碳酸盐岩储层改造深穿透后效体射孔技术在气田开发中的应用  

Technology of deep penetration and aftereffect volume perforation for carbonate reservoirs and its application to gasfield development

作　　者：夏国勇[1] 彭浩[1] 倪根生[1] 陈虎[1] 李成全[1] 郑云东 Xia Guoyong;Peng Hao;Ni Gensheng;Chen Hu;Li Chengquan;Zheng Yundong(Development Division,PetroChina Southwest Oil&Gasfield Company,Chengdu,Sichuan 610051,China)

机构地区：[1]中国石油西南油气田公司开发事业部

出　　处：《天然气勘探与开发》2020年第4期69-76,共8页Natural Gas Exploration and Development

摘　　要：四川盆地从震旦系—中三叠统以海相碳酸盐岩为主,沉积厚度4000~7000 m,已发现的28个工业油气层系中,其中海相碳酸盐岩产层20个,主要分布在震旦系、寒武系、石炭系、二叠系及中、下三叠统,储层埋深一般都大于4000 m,并且具备低孔隙(2%~8%,平均3%)、低渗透(大部分<1 mD)、低丰度(大部分气藏为2×108 m3/km2~3×108 m3/km2)、高温、高压、高含硫特征。针对碳酸盐岩油气藏埋藏深、温度高,储层增产改造措施历来以酸化压裂改造技术为主。虽然碳酸盐岩储层具有酸蚀性好、酸岩反应速度快的特点,但也具有酸液有效作用时间、有效作用距离短的弊病,存在一定的不适应性。近期深穿透后效体射孔技术在碳酸盐岩储层的成功运用,在酸压增产措施前实现了储集体内天然缝洞系统通道多方位沟通的目标,解决了后期酸压增加溶蚀造缝长度,进一步提升了有效沟通天然裂缝及储集体的机率,实现了增储上产,达到了致密碳酸盐岩储层高效开发的目的。The Sinian to Middle Triassic in Sichuan Basin is dominated by marine carbonate rocks with 4000-7000 m in depositional thickness.Among 28 discovered industrial oil and gas formations,20 of them are marine carbonate reservoirs,mainly developed in the Sinian,the Cambrian,the Carboniferous,the Permian,and the Middle to Lower Triassic.For these reservoirs,their burial depth is generally more than 4000 m,with characteristics of low porosity(2%-8%,averaging 3%),low permeability(generally<1 mD),low abundance(2-3×108 m3/km2 in most gas reservoirs),high temperature,high pressure,and high sulfur content.In view of their large burial depth and high temperature,acidizing fracturing has always been the main stimulation measures.Although the carbonate reservoirs have the characteristics of good acid corrosion and fast acid-rock reaction speed,they also has the disadvantages of short effective action time and effective action distance of acid solution,bringing about certain inadaptability.Recently,one technology of deep penetration and aftereffect perforation has been successful applied to these carbonate reservoirs.And one goal of multi-directional communication of natural fractured-vuggy channels among these reservoirs can be achieved before acid fracturing measures,and a problem for increasing the length of dissolution fractures is solved in later acid fracturing,which may further improve the probability of effective communication among natural fractures and reservoirs,increase the reserves and production,and achieve the purpose of high-efficient development of tight carbonate reservoirs.

关 键 词：四川盆地 碳酸盐岩储层 前期增产改造技术 深穿透 后效体射孔 高温高压高含硫 

分 类 号：TE377[石油与天然气工程—油气田开发工程]