负温早强水泥浆体系的室内实验

Laboratory experiments on the negative-temperature, early-strength slurry system

刘浩亚 赵卫 李燕 豆宁辉 周朝

LIU Haoya ZHAO Wei LI Yan DOU Ninghui ZHOU Zhao

中国石化石油工程技术研究院 中国石油大学(北京) 中联煤层气有限责任公司

SINOPEC Research Institute of Petroleum Engineering, Beijing 100101, China China University of Petroleum (Beijing), Beijing 102249, China China United Coalbed Mehante Co., Ltd, Beijing 100015, China

负温环境下常规固井水泥浆液相水分会分凝结冰，水化反应减缓甚至完全不进行，导致固井工作难以开展。针对该问题，通过对负温下水泥浆水化性能优化、凝结时间调节、流变性能评价、抗压强度测试等实验研究，确定了以质量分数20%的防冻促凝剂SCLC-1溶液为配浆溶液，改性高铝水泥为基础水硬性材料，醇氨类促凝剂TEL加量0.5%，凝结时间调节剂SCEG加量1%~3%的冻土区负温水泥浆体系。实验结果表明：该体系具有优良的负温固化性能，在−18 ℃条件下0.5~3 h内固化，24 h抗压强度达3.5~9 MPa，流变性能良好，可有效解决负温条件下常规水泥浆不固化无强度难题，满足冻土区固井施工要求。

In the environment of negative temperature, the liquid water in the conventional cementing slurry suffers segregation and freezing, hydration reaction slows down and even stops completely, and consequently the cementing can be hardly carried out. To solve this problem, a series of experimental studies were conducted, including the optimization of hydration performance, the regulation of setting time, the evaluation of rheological property and the test of compression strength under negative temperature. And accordingly the negative-temperature slurry system suitable for permafrost regions were determined with the antifreezing accelerating agent SCLC-1 (mass fraction 20%) as the slurry preparation solution and the modified high alumina cement as the basic-water hardening material, together with 0.5% hydramine accelerating agent TEL and 1%-3% setting time regulating agent. The experimental results show that this system has excellent negative-temperature curing performance and rheological property. Under −18 ℃, it gets cured within 0.5−3 h and its compression strength is up to 3.5−9 MPa after 24 h. It can realize curing and strength under negative temperature, so as to satisfy the construction requirements of cementing in permafrost regions.

10.13639/j.odpt.2019.03.006