聚合物微球堵塞物的解堵技术

Unblocking Technology for Polymer Nanospheres Blockage

王满学 刘 伟 刘学文 江 丰 李永飞

WANG Manxue LIU Wei LIU Xuewen JIANG Feng LI Yongfei

针对油气田注水井注入聚合物微球后堵塞致使压力升高欠注的问题，开展了解除聚合物微球堵塞物的研究，考察了解堵剂加量、反应温度、反应时间等对微球溶液黏度和粒径的影响，优化了解堵剂的最优作用条件同时进行了现场试验。结果表明：解堵剂（30% JT-1+35% HRJ+22% APG0814+10% H2O+3% NaCl）可显著降低微球粒径和黏度。在同一解堵剂浓度下，反应时间越长，反应温度越高，解堵剂对微球堵塞物的作用效果越好；在同一盐浓度下，不同盐对解堵剂解堵效果的影响次序为：NaCl≥KCl＞NH4Cl。在室温下，2%微球+5%解堵剂的解堵液在反应 4 h 时黏度为 1.46 mPa·s，微球平均粒径为 203.6 nm，与未加解堵剂的空白样（解堵液黏度为 2.17 mPa·s，平均粒径为 3243.74 nm）比较，解堵液黏度下降了 33%，微球粒径下降了 94%，解堵液中的固体物含量由675 mg/L 降至 70 mg/L，下降近 90%，解堵液的表面张力为 24.89 mN/m、界面张力为 1.849×10-2 mN/m，具有较高的表界面活性。采用该解堵剂在长庆现场进行了4口井的现场试验，取得良好解堵增注效果，较好解决了注水井长期注纳米微球后堵塞欠注问题。

A study was conducted to address the issue of insufficient injection caused by pressure increase after injection of polymer microspheres into oil and gas field injection wells. By studying the effects of factors such as the dosage of the plugging agent， temperature and time on the viscosity and particle size of the microsphere solution，the working conditions of the plugging agent were optimized. At the same time，the field test was carried out. The results showed that the unblocking agent，composed of 30%JT-1+35% HRJ+22% APG0814+10% H2O+3% NaCl，could significantly reduce the particle size and viscosity of the microspheres. At the same concentration of unblocking agent，the longer the unblocking time，the better the unblocking effect，and the suitable unblocking time is greater than or equal to 4 hours. The higher the reaction temperature，the better the blockage removal effect. At the same salt concentration，the order of influence on the effectiveness of the unblocking agent was obtained as follows：NaCl≥ KCl＞NH4Cl. At room temperature，adding 5% unblocking agent into 2% microsphere solution，the viscosity of the microsphere solution was 1.46 mPa s，and the average particle size of the microsphere was 204.6 nm after reaction for 4 hours，compared with the blank sample without the unblocking agent，the viscosity being of 2.17 mPa s and average particle size being of 3243.74 nm，the viscosity of the unblocking solution decreased by 33%，and the particle size decreased by nearly 94%. The solid content in the unblocking residue decreased from 675 mg/L to 70 mg/L，the decrease being of nearly 90%. The surface tension of the residue was 24.89 mN/m，and the interfacial tension was 1.849×10-2 mN/m，possessing the high surfacial/interfacial activites. The unblocking agent was tested on-site in Changqing and achieved good results in reducing pressure and increasing injection.

10.19346/j.cnki.1000-4092.2024.03.009