凝胶水泥堵漏剂的制备与性能

Preparation and Properties Evaluation of Gel-cement Plugging Agent

张新民 赫英状 高伟 金诚 罗勇 郭拥军

ZHANG Xinmin HE Yingzhuang GAOWei JIN Cheng LUO Yong GUO Yongjun

针对大裂缝、孔洞性恶性漏失以及含水层的恶性漏失，为了解决水泥浆堵漏存在水泥浆无法驻留、易被水 稀释、胶结强度差、堵漏效果差的问题，以丙烯酰胺（AM）、2-丙烯酰胺-2-甲基丙磺酸（AMPS）、N-乙烯基吡咯烷 酮（NVP）和疏水单体MJ-16 的共聚后水解方式制备了四元高分子凝胶，将凝胶加入水泥浆中形成凝胶水泥浆复 合堵漏体系，研究了复合体系的抗水稀释性能、流变性、驻留能力以及抗压强度。结果表明，该凝胶高温下具有 良好的流变性能，表现出较好的抗温性能。凝胶与水泥、缓凝剂、消泡剂形成的凝胶水泥体系流动度达21 cm、稠 化时间可调，可安全泵送；体系入水仍为一体，在150 r/min 的搅拌速度下未被水稀释，具有良好的抗水侵性能；体 系通过1 mm裂缝的时间是普通水泥浆的10 倍以上，具有良好的滞留能力，能够停留在漏层入口处堆积，且抗压 强度达到7 MPa以上。该凝胶水泥体系特别适用于大孔道、大裂洞、暗河及含水层的漏失堵漏。

To solve the problems that cement slurry can not stay，is easy to be diluted by water，and is poor in cementing strength and plugging effect for blocking the malignant leakage in large cracks，vug and aquifer，a quadripolymer gel was prepared by copolymerization of acrylamide（AM），2-acrylamide-2-methylpropanesulfonic acid（AMPS），N-vinylpyrrolidone（NVP）and hydrophobic monomer（MJ-16），and the gel was further added to cement slurry to form a gel-cement slurry composite leakage plugging system. The water dilution resistance，rheology，retention capacity and compressive strength of the composite system were studied. The results showed that the gel had good rheological property and temperature resistance. The system formed by gel， cement，retarder and defoamer had a fluidity of 21 cm and adjustable thickening time，and can be pumped safely. The system was still integrated under water and had good resistance to water invasion，resulting in it was not diluted by water at the stirring speed of 150 r/min. Moreover，the system had good retention capacity，as a result，the time of the system to pass the 1 mm crack was more than 10 times that of the ordinary cement slurry，and the system could stay and stack at the entrance of the leak layer，as wells as the compressive strength reached more than 7 MPa. The gel-cement system was especially suitable for the leakage plugging of large channels，large fracture holes，underground rivers and aquifers.

10.19346/j.cnki.1000-4092.2023.04.005