水平管流中水合物颗粒运移和沉积数值模拟

Numerical Simulation of Hydrate Particle Migration and Deposition in Horizontal Pipe Flow

在深水气井开发过程中,泥线附近的低温高压环境容易在井筒内形成水合物,导致水合物堵塞风险大幅度升高。本文通过建立水合物颗粒输运模型和颗粒在管壁上沉积的判断准则,对传统的离散相模型进行了优化,实现水合物颗粒在管流中的输运和沉积规律模拟。本文得到了管流中水合物颗粒分布情况。在气芯中产生的颗粒的沉积率可以达到7%左右,随着气体速度的增加,沉积率降低,而随着颗粒尺寸的增加,沉积率先增加后稳定不变。该研究为准确计算水合物沉积堵塞奠定了基础。

In the process of deep-water gas well development,the low temperature and high-pressure environment near the mudline is easy to form hydrates,leading to a significant increase in the risk of hydrate plugging.In this paper,the traditional discrete phase model is optimized by establishing the transport model of hydrate particles and the judgment criteria of particles deposition on the wall to realize the simulation of the transport and deposition of hydrate particles.The distribution of hydrate particles in pipe flow was obtained.The deposition rate of particles generated in the gas core can reach about 7%.With the increase of gas velocity,the deposition rate decreases,while with the increase of particle size,the deposition first increases and then remains stable.This study lays a foundation for accurate calculation of hydrate plugging.