Abstract: A wellhead isolation tool nipple seal testing apparatus includes an upper seal, upper nipple, and a lower seal and a lower nipple, the lower nipple being attached to the upper nipple. Test pressure forced between the upper and lower seals may be used to test the upper nipple up to well servicing pressures. The lower nipple may seal the well bore by being closed, or by the use of a mandrel carrying a seal on its lower end or with a burst disk.

Abstract: A packoff nipple for use on the mandrel of a wellhead isolation tool features a two step extrusion sealing arrangement activated by a primary element forcing the expansion of a packing ring to fill voids in the tubing or casing brought about by pipe erosion, corrosion, out of round or off center mandrel conditions. Extremely high pressures are sealed off from the wellhead. The packoff nipple sealing elements are protected from damage when running the nipple through restricted areas in the wellhead and the tubing or casing.

Abstract: A novel adapter and pin assembly allows the close attachment of a high pressure pumping array of valves to the low pressure tubing or casing head on the well. This allows high pressure fluids or gases to be pumped through the low pressure tubing or casing head, into the tubing and down the well while isolating the low pressure tubing or casing head from these fluids or gases. The high pressure seals are tested prior to the start of the high pressure pumping, and the low pressure fittings are protected and monitored by suitable vents.