Well head isolation tool sealing nipple testing apparatus and method of pressure testing isolation tool sealing nipple seals when in position on a well
OwnerBruce Cherewyk, Roderick D. McLeod +1inventors
InventorsBruce Cherewyk, Roderick D. McLeod, Albert Roesch
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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.
Claims12
In a wellhead isolation tool for use on a wellhead having casing, the wellhead isolation tool including a mandrel having a first nipple, the first nipple having a nipple bore, and a first nipple seal for isolating the wellhead from fracturing pressure, the improvement comprising:
- sealing means disposed in sealing engagement with the casing below the first nipple seal for isolating well pressure and fluid above the sealing means from well pressure and fluid below the sealing means;
- and
- means for connecting the sealing means to the nipple.
In a wellhead isolation tool for use in a well having casing, the casing defining a well bore, the wellhead isolation tool having an upper nipple, the upper nipple having a nipple bore, and an upper nipple seal for isolating the wellhead from fracturing pressure, the improvement comprising:
- sealing means connected to the upper nipple for movement with the upper nipple during installation and removal of the wellhead isolation tool, the sealing means including a lower nipple having a lower nipple seal disposed circumferentially around the lower nipple for contacting the well casing and for sealing the well bore.
A method of testing a seal for a wellhead isolation tool, the tool including a mandrel and first sealing nipple having at least a first seal, while the wellhead isolation tool is attached to a wellhead having a well bore, comprising the steps of:
- attaching the isolation tool to the wellhead;
- inserting the mandrel and first sealing nipple into the well bore, the first sealing nipple carrying the first seal;
- sealing the well bore below the first seal;
- and
- applying test pressure into the well bore.
Dependencies are inferred from the claim text.