摘要
In the core process of fractured marine gas hydrate(hereinafter referred to as hydrate)particles being transported up to the surface platform by airtight pipeline in the solid fluidization exploitation of marine gas hydrate reservoirs,influenced by the rising temperature and the dropping pressure,the solid hydrates will decompose and produce a large amount of gas at a certain critical point,causing the liquidesolid two-phase flow in the wellbore to change into complicated gaseliquidesolid multiphase non-equilibrium flow,which further aggravate well control,solid phase transportation and other safety risks.In view of this,the dynamic hydrate decomposition law in the above process was studied in this paper by establishing multiphase wellbore flow mathematical models of wellbore temperature and pressure field,hydrate phase equilibrium,hydrate dynamic decomposition in multiphase riser pipe flow,wellbore multiphase flow coupled hydrate dynamic decomposition,and a numerical calculation method was proposed and verified.The following results were obtained.First,by numerical model analysis,the effects of liquid phase displacement,solid throughput(daily gas production rate)and wellhead back pressure under different construction parameters on multi-phase non-equilibrium pipe flow were obtained.In addition,the field construction guidance measures were put forward based on multiphase non-equilibrium pipe flow characteristics as follows:to properly increase the solid throughput so as to increase the natural gas production,to appropriately increase the liquid-phase displacement and the wellhead back pressure so as to ensure well control safety.This study provides not only a theoretical basis for the prediction of multiphase non-equilibrium pipe flow in the solid fluidization exploitation,but a technical support for the field construction parameter optimization and well control safety.
基金
Project supported by the National Key R&D Program“New Technology for Marine Hydrate Solid Fluidization Testing”(No.:2016YFC0304008)
Strategic Research Project for Medium-and Long-Term Development Strategy Research in China's Engineering Science and Technology“Research on Deep Sea Gas Hydrate Development Strategy for 2035”(No.:2017-ZCQ-5)
Key Project of National Natural Science Foundation of China,and“Measurement and Control Theory and Key Issues of Managed Pressure Drilling”(No.:51334003).
