摘要
研制了由一种可溶解硫酸钡的配方物及各种添加剂组成的水溶性液体清垢剂DS 8(密度≥ 1 .2 g/cm3,pH值1 0— 1 4)并考察了各项应用性能。随其水溶液浓度 (体积分数 )的增加 ,DS 8对硫酸钡的溶解量增大 ,但单位体积的溶解量 (溶垢能力 )下降 ,最佳使用浓度为 1 0 %— 2 0 % ;最佳使用温度为 4 0℃ ;在各种难溶盐中 ,DS 8对硫酸钙的溶解能力最强 ,其次是硫酸锶 ,再次是硫酸钡。每升DS 8可溶解硫酸钡 62 .4 g。DS 8完全无腐蚀性 ,对A3钢试片的腐蚀速率仅为 0 .0 0 4 g/m2 ·h( 45℃ ,72h)。青海油砂山油田长 1 2 60m的易结垢集输管线 (垢厚一般 5— 2 0mm ,最厚达 3 0mm)用体积分数 1 7%的DS 8水溶液共 58m3单循环清洗 ,历时 4 3小时 ,共清洗出积垢 94 4 .2 4kg ,其中硫酸钡 4 86.3 6kg ,硫酸锶 95.3 6kg ,硫酸钙 1 7.62kg ,垢泥 3 44 .90kg ;开始清洗时泵压 0 .3 5MPa ,以后降到 0 .0 5MPa以下 ,说明管线已畅通。
A liquid scale dissolving agent of density≥1.2 g/cm 3 and pH=10-14 miscible with water and composed of a BaSO 4 dissolving composition with additives is prepared and its performance properties are investigated. With increasing the concentration of the DS 8 aqueous slution used, the total dissolved BaSO 4 amount increases but the BaSO 4 amount dissolved by unit volume of DS 8 decreases and the optimum concentration of working solution is shown to be of 10-20%. The optimum working temperature is 40℃. The dissolving power of DS 6 for hardly acid soluble sulfates is arranged in order: CaSO 4>SrSO 4>BaSO 4. The solubility of BaSO 4 in 10% DS 8 solution is 62.4 g/L. DS 8 is non corrosive and the corrosion rate of A3 steel test specimen in 20% DS 8 solution at 45℃ in 72 hrs is as low as 0.004 g/m 2·h . A section of crude gathering pipeline 1 260 m long with heavy scale precipitations(5-20 mm and up to >30 mm thick) is treated by circulating 58 m 3 of 17% DS 8 solution over 43 hrs and in result 944.24 kgs of scaled substances is removed, of them 486.36 kgs of BaSO 4, 95.36 kgs of SrSO 4, 17.62 kgs of CaSO 4, and 344.90 kgs of mud sludge. The pumping pressure is decreased from 0.35 MPa at the beginning of the chemical cleaning operation to <0.05 MPa near the end.
出处
《油田化学》
CAS
CSCD
北大核心
2001年第3期241-243,共3页
Oilfield Chemistry
关键词
除垢剂
酸不溶垢
硫酸钡锶垢
除垢
化学清洗
集输管道
青海油砂山油田
Scale Cleaning Agent
Sparingly Acid Soluble Salt Precipitation
Barium/Strontium Sulfate Precipitation
Scale Deposites Cleaning
Chemical Cleaning
Crude Oil Gathering Pipelines
Youshashan Oil Fields in Qinghai
