高温气井非均质碳酸盐储层自转向酸的研制与应用

Development and Application of Self-steering Acid in Heterogeneous Carbonate Reservoir of High Temperature Gas Well

马 超 赵 林 杨 海 周 超 张珂涵

MA Chao ZHAO Lin YANG Hai ZHOU Chao ZHANG Kehan

针对高石19井区西北部气井温度高、常规自转向酸高温降黏导致酸化效果不理想的问题，以含芥酸酰胺羟磺基两性表面活性剂黏弹性转向剂、抗高温酸化缓蚀剂、阳离子低聚物抗温剂等为原料制得自转向酸。评价了自转向酸的抗温性、缓蚀性、缓速性能和自转向性能，并在天东110井进行了现场应用。结果表明，自转向酸适宜的配方为20% HCl+8%转向剂EP-306B+2%铁离子稳定剂TYL+2%酸液缓蚀剂GSY+1%酸液缓蚀增效ZXJ+1%阳离子低聚物DJW+6%有机酸YJS。自转向酸的抗温性和缓蚀性能较好，在150℃下与岩屑反应后的最高黏度为48 mPa·s，对钢片的腐蚀速率为49.8 g/（m2·h）。自转向酸的缓速性能良好，与岩屑反应40 min后酸液质量分数仅降低3%。对高110井渗透率倍数为21.4的2块岩心进行酸化，对低渗透率岩心的改造率为72.2%，具有良好的自转向性能。在天东110井自转向酸酸化中取得预定的酸化效果，残酸返排率达到70%，实现储层有效均匀改造。该自转向酸体系在高温气井非均质地层具有良好的酸化效果。

In view of the high temperature of gas well in the northwest part of Gaoshi 19 well area and the unsatisfactory acidification effect caused by the high temperature and viscosity reduction of conventional self-steering acid，the self-steering acid was prepared by erucamide hydroxysulfonate amphoteric surfactant viscoelastic steering agent，corrosion inhibitor with high temperature resistance，cationic oligomer temperature inhibitor，etc. The temperature resistance，corrosion inhibition，retarding performance and self-steering performance of self-steering acid were evaluated，and then it was applied in Tiandong 110 well. The results showed that the suitable formula for self-steering acid was obtained as follows：20% HCl，8% steering agent EP-306B，2% iron ion stabilizer TYL，2% acid corrosion inhibitor GSY，1% acid corrosion inhibitor ZXJ，1% cationic oligomer DJW，6% organic acid YJS. The self-steering acid had good temperature resistance and corrosion inhibition performance. The maximum viscosity that reacted with cuttings at 150℃ was 48 mPa·s，and the corrosion rate of steel sheet was 49.8 g/（m2·h）. The retarding performance of self-steering acid was good，and the mass fraction of the acid only reduced by 3% after reacting with the cuttings for 40 minutes. The acidification of two cores with a permeability multiple of 21.4 in Gao 110 Well had a conversion rate of 72.2% for the low permeability core，indicating good self-steer performance. In the self-steering acid acidification of Tiandong 110 well，the predetermined acidification effect was achieved，and the flowback rate of residual acid reached 70%，realizing effective and uniform reservoir reformation. The self-steering acid system had a good acidification effect in heterogeneous layer of high temperature gas well.