Wells – Cementing device
Reexamination Certificate
2008-05-13
2008-05-13
Neuder, William P (Department: 3672)
Wells
Cementing device
C166S332500
Reexamination Certificate
active
07370698
ABSTRACT:
A multi-functional apparatus and method for drilling fluid and cementing operations to set casing in a wellbore for use on either top drive or rotary type rigs. The apparatus and method includes a fill-up and circulating tool, a cementing head assembly, a wiper plug assembly, and a push plate assembly. The fill-up and circulating tool comprises a mandrel with a sealing element disposed about the outside diameter of the mandrel. The cementing head, push plate, and wiper plug assemblies are useable on any fill-up and circulating tool capable of being inserted into a casing. To fill the casing, the assembly is lowered from the rig such that a portion of the fill-up tools inserted into the casing, the pumps are then actuated to flow fluid into the casing. To circulate fluid, the tool is lowered further such that the sealing element sealingly engages the inside diameter of the casing to allow fluid to flow through the casing, into the wellbore, and back to the fluid pumps. To utilize the push plate assembly, the push plate is rotated until attachment pins engage into corresponding J-slots and lock the plate in place. The fill-up tool is lowered so that the push plate contacts the top of the casing thus transferring the rig load onto the casing. To cement the casing, the cement pump and hose assembly is connected to the cementing head to allow cement to be pumped through the fill-up and circulating tool and into the casing string. A cement plug assembly comprising a plurality of wiper plugs is connected to the outlet of the fill-up and circulating tool. The wiper plugs are then released at a predetermined time during the cementing process to provide a positive seal at the bottom of the casing string.
REFERENCES:
patent: 5735348 (1998-04-01), Hawkins, III
Hawkins, III Samuel P.
Latiolais, Jr. Burney J.
Lutgring Keith T.
Mosing Donald E.
Sipos David L.
Frank's International, Inc.
Neuder William P
The Matthews Firm
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