含水合物阻聚剂的水合物浆液流动特性实验研究

水合物浆液技术作为一种新型油-气-水多相安全混输的方式逐渐受到油气生产和集输部门。利用一套近中试规模的模拟水合物循环管路,研究了在水合物阻聚剂存在条件下,不同初始含水率(20.0%~30.0%)水合物浆液的流动特性。实验结果表明,随着水合物颗粒的形成,体系流量伴随着波动逐渐下降,最终趋于稳定;而体系压差呈现先剧烈增加,而后逐渐下降并趋于稳定的趋势。与初始原料气组成相比,水合物浆液形成后体系内平衡气中轻烃组成存在不同程度的富集,从而导致平衡气水合物生成条件曲线向着低温高压区域偏移。由水合物浆液宏观形态演化过程可知,随着水合物颗粒的形成,原有的油水乳液结构遭破坏,最终形成的水合物浆液为固(水合物)-液(柴油)分散体系。另外,由不同时间(2 h、4 h和8 h)的停输/重启实验可知,水合物浆液表现出明显的触变性流体特征,且随初始含水率的增加,其触变性特征愈明显。

Experimental study on flow characteristics of hydrate slurry in the presence of anti-agglomerant

Hydrate slurry technology, as a new way for oil-gas-water multiphase flow assurance, has drawn much attention for oil/gas production and transportation department. Using a set of simulation hydrate flow-loop apparatus, the flow characteristics of hydrate slurry with different initial water cuts ranging from 20.0 % to 30.0 % was experimentally studied in this paper. The experimental results showed the flow rate decreases with the formation of hydrate and then becomes stable, whereas the pressure drop first increases with increasing hydrate quantity formed, then gradually decreases with some fluctuation, and finally reaches a stable value. The study on the fluid morphology demonstrated that the original structure of water-in-oil emulsion is destroyed with the formation of hydrate, and the hydrate slurry is ultimately transported as a solid dispersion system. In addition, the hydrate slurry in the presence of anti-agglomerant can be easily and safely restarted after spending different shutting down times (2 h, 4 h, and 8 h) in the static state, and shows thixotropic behavior with increasing initial water cut.