水合物颗粒与矿物表面间粘附力特性及其影响因素

Characteristics and influencing factors of adhesive force between hydrate particles and mineral surface

滕莹 王朋飞 Aman Zachary

Ying Teng Pengfei Wang Zachary Aman

在水合物开采过程中，管道内的液滴和气泡受环境条件影响会转化生成水合物颗粒，水合物颗粒发生聚集时会引起堵塞，导致潜在的安全问题。粘附力是探究开采管道流动安全及水合物颗粒聚集和沉积机理的关键，目前相关研究主要集中在输运过程中水合物颗粒间或颗粒-表面间粘附力的测量和描述，而对开采过程中沉积物矿物润湿性及表面粗糙度对粘附力的影响关注较少。利用粘附力测量实验系统，开展了水合物颗粒与经不同方法处理的碳钢表面及石英石、孔雀石、方解石和高岭石等矿物表面间粘附力的测量分析。结果显示，受润湿性影响，水合物颗粒与矿物表面之间粘附力是其与碳钢表面粘附力的3 ~ 6倍。此外，水合物颗粒与矿物表面粘附力受接触时间影响，与方解石和高岭石表面间的粘附力随接触时间的延长而增加。进一步探索添加离子表面活性剂对水合物晶体生长速度及粘附力的影响，并指出颗粒与矿物表面水膜接触面积变化使水合物颗粒形貌由层状结构变为针状结构。对比实验测量结果与理论计算结果的差异，分析得出矿物表面的强亲水性是造成结果差异的关键原因。

In the process of hydrate mining， the droplets and bubbles in pipeline can be turned into hydrate particles under the environmental conditions. The occurrence of hydrate particle aggregation can cause blockage， leading to potential safety problems. Adhesive force is the key to exploring the flow safety of mining pipeline and the accumulation/deposition mechanism of hydrate particles. At present， the relevant researches focus on the measurement and characterization of the adhesive force between hydrate particles or between particles and surface in transport process. However， documents on the effects of mineral wettability and surface roughness on the adhesion of hydrate deposits are rarely seen. In this study， the adhesive force between hydrate particle and carbon steel surface treated by different methods as well as mineral surface， such as quartz， malachite， calcite and kaolinite were measured and analyzed using the adhesive force measurement experimental system. The results show that the adhesive force of hydrate particles to mineral surface is 3-6 times that of hydrate particles to carbon steel surface， due to the wettability difference. In addition， the adhesive force between hydrate particles and mineral surfaces is also affected by contact time， as shown by the strengthened adhesive force of hydrate particles with calcite and kaolinite surfaces under prolonged contact. The effects of ionic surfactants on hydrate growth rate and adhesion were also investigated， and it was pointed out that the change of contact area between particles and water film on mineral surface serves to change the morphology of hydrate particles from layered structure to needle-like structure. Finally， in comparison of the experimental results with theoretical calculation， we concluded that the strong hydrophilicity of the mineral surface is key to the differences.

10.11743/ogg20220318