纳米封堵剂NF-1的制备与性能评价

Development and Evaluation of the Nano Plugging Agent NF-1

纳米材料具有粒度小、分散性高、稳定性好的特点,能够解决钻井过程中地层漏失和井壁不稳定等问题。通过研究反应溶剂、反应物物质的量比、反应温度、表面活性剂种类等有关因素,结合水热法与溶剂热法制备出一种适用于钻井液的纳米封堵材料。实验研究发现,将SnCl_4·5H_2O和苯并咪唑按4∶0.1的物质的量比加入到无水乙醇和去离子水混合液中,再加入一定量的十二烷基苯磺酸钠,在100~120℃下反应,可以制得粒度达到91.4 nm的一维无机纳米封堵材料NF-1。封堵评价实验结果表明,在3%钻井液基浆中加入5%的NF-1,在105℃、3.5 MPa、30 min条件下测得滤失量为12.8 mL,钻井液泥饼渗透率由8.166×10^(-7)μm^2下降为2.225×10^(-7)μm^2,说明该纳米封堵材料性能优异、封堵效果好。

Nano material has small particle size, is well dispersed and has stable properties, thus is always used in solving lost circulation and borehole collapse encountered in drilling operation. A nano material plugging agent, NF-1 was developed by adding SnCl_4·5H_2O and benzimidazole into a mixture of absolute alcohol and deionized water under certain conditions. The synthesis was done by combining hydrothermal method and solvothermalmethod, taking into account the effects of reaction solvent, molar ratio of reactants, reaction temperature, and surfactant used in the reaction. NF-1 has particle size of 91.4 nm. Laboratory evaluation showed that addition of 5% NF-1 into a base mud reduced the 30 min filter loss of the base mud to 12.8 mL at 105 ℃, 3.5 MPa, indicating that NF-1 had excellent plugging performance.