Session 4 - Oral 8
Fundamental Investigation of the Adhesion Strengths between High-Pressure Gas Sintered Hydrate Deposits and Solid Surface
Yang Liang，Liu Chenwei
School of Petroleum Engineering, China University of Petroleum (East China), Qingdao 266580, PR China
Abstract：Hydrate deposits on deep water pipelines can cause blockage accidents in severe cases, which bring great challenges to the safety and economics of mining and transportation. The adhesion of sintered methane hydrate deposits under high pressure is still unclear, which motivates us to conduct intensive research. In this work, the adhesion strengths of sintered methane hydrate deposits under different formation conditions were measured by using a self-built high-pressure hydrate adhesion strength test device. The influencing factors such as subcooling and annealing time were analyzed. The experimental results show that the adhesion strengths of methane hydrate deposits were positively correlated with the subcooling and annealing time. At the annealing time of 90mins, the adhesion strengths at the subcooling of 1℃, 4℃, and 7℃ were 70.49±9.51kPa, 168.02±25.23 kPa, and 418.72±58.86 kPa. Compared with the subcooling, the effect of annealing time on adhesion strength is slightly weaker, which is within 24% at the annealing time of 330mins.Understanding the adhesion mechanisms of high-pressure methane hydrate deposits is helpful to clarify the blockage mechanism of hydrates in the real environment, which is of great significance to flow guarantee and in oil and gas pipelines.
Key Words：methane hydrate，adhesion strength, subcooling, annealing time