三元复合驱矿藏采油井结垢及清垢剂的研究及应用  

A Study on Inorganic Scale Formed and Scale Removing Fluid Used in Production Wells of ASP-Flooding Reservoirs

作　　者：王贤君[1] 王庆国[2] 

机构地区：[1]中国矿业大学资源系,北京100083 [2]中国石油大庆油田公司采油工艺研究院,黑龙江大庆163453

出　　处：《油田化学》2003年第1期1-3,共3页Oilfield Chemistry

摘　　要：大庆油田NaOH/ORS 41/HPAM三元复合驱区块的采油井结垢严重。简要分析了这些采油井结垢的原因,对取自2口采油井井下的4个垢样进行了分析。垢样的主要化学成分有:有机物(原油和聚合物)、CaO、MgO等;主要矿物成分为非晶质二氧化硅和六方球状方解石、普通方解石及硫酸钡等;次要矿物成分为碎屑状石英、长石、粘土和黄铁矿等;垢由粗粒层和胶泥状细粒层交替沉积而成;垢的主要类型为硅垢和碳酸钙垢。在垢分析的基础上研制了一种清垢剂,其总体配方(质量百分数)为:10%～15%复合酸(氢氟酸、盐酸、有机酸)+6%～8%垢转化剂+8%～12%螯合剂+2%～4%表面活性剂+4%～6%缓蚀剂+水。该清垢剂45℃时对大庆各区块油井垢的溶蚀率不小于80%,溶蚀反应可在2h内完成,腐蚀速率仅为0.80g/m2·h。用该剂处理了结垢严重的4口采油井,单井每次用量为10～20m3,清垢效果良好,检泵周期大大延长。图1表4参2。Severe scaling problems appear in production wells of reservoirs flooded by NaOH/ORS41/HPAM combinational solution in Daqing. The reasons for scale formation are discussed concisely and 4 scale samples taken from 2 wells are analysed. It is found that the main chemical constituents of the scale are organic substances (crude oil and polymers), CaO, MgO, and others; the main mineral constituents are vaterite, calcite, barium sulfate, etc, and the secondary minerals - clastic quartz, feldspar, particulated clay, pyrite, etc; the scale consists of coarse grain and cementitious fine grain layers precipitated alternatively; basically the scale are of siliceous and calcium carbonate types. On the basis of scale analysis a scale removing fluid is developed and its general formula is (by mass): 10-15% mixed acid (HF, HCl, and organic acids) +6-8% scaleconverter+8-12% chelating agent+2-4% surfactant+4-6% corrosion inhibitor + water. The dissolution rate in the fluid of scale samples from wells of various reservoirs in Daqing is not less than 80% at 45℃, the dissolution reaction completes in 2 hrs and the corrosion rate of the fluid is of 0.8 g/m2·h only. Treating 4 wells with scaling troubles by this fluid in 10-20 m3 per welltime results in satisfactory precipitate removal and in significantly prolonged periods between two pump maintainment/repair jobs.

关 键 词：结垢 采油井 三元复合驱油藏 产品研究 开发 油井清垢 大庆油田 

分 类 号：TE358.5[石油与天然气工程—油气田开发工程] TE39