1.The minimum underbalance is independent of viscosity and compressibility and of reservoir fluids.It is a function of the formation porosity, permeability and radius of perforation channels.
最小测不是依赖于地层流体粘度和缩性,而是为地层孔隙度、渗透率和射孔孔眼半径的函数。
2.While underbalance drilling spreads greatly, rotating blowout preventer, as a kind of high technical product, is the crucial equipment to control well pressure.