气井井筒溶垢剂的制备与应用

Preparation and Application of Scale-dissolving Agent on Wellbore of Gas Well

李明星 刘 伟 周明明 崔 熙 朱方辉 董晓焕 李琼玮

LI Mingxing LIU Wei ZHOU Mingming CUI Xi ZHU Fanghui DONG Xiaohuan LI Qiongwei

长庆S2××区块气井井筒堵塞物主要有CaCO3、 CaSO4、 BaSO4等垢和FeCO3、 FeS等腐蚀产物， 对生产影响较大。针对这一情况， 从溶垢量、 起泡能力和缓蚀性等方面开展了解堵剂的制备与性能研究， 确定了配方为10%有机酸YG-1+1%炔醇类酸化用缓蚀剂HJF-50A+0.5%泡排剂UT-11C的酸性解堵剂和配方为10% 胺基酸盐YH-1+0.5% 十二烷基磺酸盐类泡排剂 YFP-2的碱性螯合剂。在温度 20～90℃下， 酸性解堵剂对 CaCO3的饱和溶垢率为85.93%～ 87.46%， 对应饱和溶垢量为68.74～ 69.97 g/L； 对FeCO3的饱和溶垢率93.76%～ 95.02%， 对应饱和溶垢量为 75.01～ 76.02 g/L； 对 FeS的饱和溶垢率为 65.69%～ 71.23%， 对应饱和溶垢量为 52.55～ 56.98 g/L； 对 80S挂片的腐蚀速率 3.13 g/ （m2·h）， 携液率 90.00%。碱性螯合剂主要溶 BaSO4、 CaSO4等酸不溶物， 在 90℃时， 对BaSO4的饱和溶垢率 72.43%， 对应饱和溶垢量为 14.49 g/L； 对 CaSO4的饱和溶垢率 76.78%， 对应饱和溶垢量为61.43 g/L； 携液率 95%。现场采用酸性解堵剂和碱性螯合剂多轮次间歇加注方式处理井筒结垢严重井， 油套压差降幅达1.01～3.0 MPa， 产气量增幅为14.2%～53.71%， 获得了显著的溶垢效果。表9参17

Two kinds of wellbore blockage is harmful to gas production in filed， including CaCO3， CaSO4 and BaSO4 scales and FeCO3， FeS corrosion products. For this problem， an acidic plug removal agent， which was composed of 10% organic acid + 1% inhibitors for the oxidation of propargyl alcohols HJF-50A + 0.5% foam UT-11C，and an alkaline chelating agent，which was composed of 10% amino acid salt YH-1 + 0.5% dodecyl sulfonate foaming agent YFP-2， was selected through investigating the scale dissolving mass， foamability and inhibition ability. The acidic plug removal agent mainly dissolved CaCO3、 FeCO3 and FeS. At the temperature of 20—90℃， the saturated scale dissolving rate of CaCO3 was 84.01%—87.49%， and the saturated scale dissolving mass was 67.21—69.99 g/L；the saturated scale dissolving rate of FeCO3 was 92.16%—95.98%， and the dissolving saturated scale mass was 73.73—76.78 g/L；the saturated scale dissolving rate of FeS was 64.91%—72.30 %， and the dissolving saturated scale mass was 51.93—57.84 g/L. The corrosion rate of 80S in the acidic plug removal agent was 3.13 g/ （m2·h）and the holdup rate was 90.00%. The alkaline chelating agent mainly dissolved BaSO4 and CaSO4. At the temperature of 90℃， the saturated scale dissolving rate of BaSO4 in the alkaline chelating agent was 72.43% and the saturated scale dissolving mass was 14.49 g/L， the saturated scale dissolving rate of CaSO4 was 76.78% and the saturated dissolving scale mass was 61.43 g/L. The holdup rate of the alkaline chelating agent was 95% . Scaling wells in filed were treated by multiple rounds of intermittent injection using the acidic plug removal agent and the alkaline chelating agent and the significant effect for dissolving scale was realized， as a result， the pressure of tubing and casing decreased from 1.01 to 3.0 MPa， and the gas production increased from 14.2% to 53.71%..

10.19346/j.cnki.1000-4092.2018.01.028