有机氟硼酸在王家岗敏感性地层的应用  

Application of Organic/Fluoroboric Acid for Blockage Removal in Sensitive Wangjiagang Reservoirs

作　　者：汪竹[1] 宋克炜[1] 芦维国[1] 张丁涌[1] 温鸿滨[1] 曹锋[1] 孙庆宇[1] 朱青云[1] 

机构地区：[1]中国石化胜利油田公司现河采油厂,山东东营257068

出　　处：《油田化学》2004年第1期10-12,共3页Oilfield Chemistry

摘　　要：根据3口井岩心矿物组成及碳酸盐含量数据,认为王家岗沙四段砂岩储层土酸和低伤害酸酸化效果差的原因,是储层碳酸盐、泥质含量高,酸岩反应速度快,反应产物产生一次及二次沉淀,乏酸液反排困难,在这类地层可采用有机氟硼酸体系。根据3口井储层岩心溶蚀率及酸化淤渣率数据,得到了各适用于某一口井的3个混合酸:4%/4%、6%/4%、4%/12%的醋酸/氟硼酸。筛选了酸液缓蚀剂KX1 7,N80钢片在加入1%KX1 7和5%NH4Cl的醋酸/氟硼酸液中80℃腐蚀速率为0.45～2.5g/m2·h。注入由3个混合酸配成的酸液使对应岩心的渗透率分别增大25%、76%、52%。在3口油井用该有机氟硼酸液酸化解堵,均获得了成功。较详细地介绍了在一口新投产不出油的井用醋酸/氟硼酸酸化液酸化,用液态CO2助排的施工情况和施工后产油情况。图3表5参3。It is ascertained from the data of mineral composition and carbonate in reservoir cores of 3 wells that uneffective acidization of pay layer S4 at Wangjiagang by using mud acid and low damage acid originates from high carbonate and shale contents, fast acid/rock reactions, primary and secondary precipitates created and unsufficient backflow of spent acids and that organic/fluoroboric acids are proper choice for these reservoirs. Based on the experimental results of solving out of cores from 3 wells and of acid sludge formation, 3 acetic/fluoroboric (Ac/FB) acids of concentration 4%/4%,6%/4%,and 4%/2% are selected each for a reservoir core. A corrosion inhibitor, KX1-7, is chosen and the corrosion rate of N80 steel test specimen at 80℃ in Ac/FB acids with 1% KX1-7 and 5% NH_4Cl added is in 0.45—2.5 g/m^2·h. Injecting every of the 3 acidizing fluids into one of the cores leads to increase in permeability to water by 25%, 76%, and 52%, respectively. The acidizing jobs by using the Ac/FB acidizing fluids in 3 oil wells are all successful. One of these wells is a new producer without oil flown out and the acidizing operation in this well and the production after the acid treatment are presented in some detail.

关 键 词：有机氟硼酸 敏感性地层 醋酸 砂岩油藏 酸化工艺 解堵技术 

分 类 号：TE357.2[石油与天然气工程—油气田开发工程] TE358.5