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.
While conducting hydraulic fracturing, the flow rate is required to be controlled to enable the hall-off to block off and uncord the eyelet based on the stimulation process.
On his crossed feet were black moccasin-type ties, the kind with two eyelets that are almost as comfortable as strollers and don't wear your socks out every time you walk a block.
This corridor was darker and more ill-smelling than the first. There was a row of cells on each side, the doors of which were locked. There was a hole in each door — eyelet, so called — of about an inch in diameter.