Migration Law of Soluble Bridge Plug Debris in Polymorphic Flow Domain of Coiled Tubing in Horizontal Section
As the oilfield is developed extensively,the bridge plug milling by coiled tubing has been widely applied.However,when the technology is applied in the field,a series of engineering problems such as low mill-ing time efficiency and frequent downhole failures occur,due to the accumulation of bridge debris.Therefore,it is awfully necessary to explore the migration law of bridge debris in the polymorphic flow domain of horizontal well-bore.The CFD numerical simulation method was used to study the migration of bridge debris under different mor-phologies of coiled tubing in horizontal section,and explore the variation of volume fraction of bridge debris on each section under different boundary conditions(viscosity and flow rate of milling fluid,initial volume fraction of solid phase).The results show that an increase in the viscosity of milling fluid,a decrease in the flow rate of mill-ing fluid and a decrease in the initial volume fraction of solid phase are all favorable for the migration of bridge deb-ris.When the coiled tubing is at the center,the volume fraction of bridge debris at the outlet is 26.5%higher than that at the time of spiral buckling of coiled tubing,and the initial volume fraction of debris has the greatest impact on debris migration.The research conclusions effectively prevent risks such as downhole sticking.
NETL
NSTL
万方数据
